A Rebalix guide to savings, unexpected expenses, risk and investment decisions. With examples in euros, a few pitfalls to recognise and a monkey not to take too seriously.
Luck can hit the target. A good result, on its own, does not explain how we got there.
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Opening an app and buying an investment can take just a few minutes. Understanding how it fits into your life takes a few more questions.
When will you need the money? What would happen if its value fell just before a planned expense? How much does a fee matter? And why does a 50% gain after a 50% loss fail to get you back to where you started?
That is where this guide begins. You do not need to know the financial acronyms already: we will introduce them one at a time and connect them to practical situations. The aim is to help you examine an investment knowing what to look for and what to ask.
1. Investing is not a shortcut to getting rich
Investing can help you manage existing wealth and build resources for the future over time. It does not replace income or guarantee wealth. The outcome depends on your starting capital, additional savings, time and the returns actually achieved.
For someone starting with a modest amount, earning and saving more can matter more than chasing a higher return. Example: an extra two percentage points of return on €5,000 amount to €100 over one year, before costs and taxes. Saving an extra €100 a month adds €1,200 of capital instead. The extra return is uncertain; saving more also requires genuine room in the household budget.
Your skills and earning capacity are part of the picture
Skills, education and professional expertise can broaden your earning opportunities. Training, a qualification or developing a business may therefore deserve attention alongside financial investments. Not every course pays for itself and not every business succeeds: quality, the commitment required, demand and practical opportunities to use what you learn all matter.
Searching for the stock that will “take off” can shift attention away from these factors towards a concentrated bet. A quick gain is possible, but it is not a reliable basis for planning a future expense. Investing and speculation are not distinguished solely by the product's name: purpose, time horizon, analysis and the risk taken all count.
Before looking for the next winner, a useful question is: which decision could sustainably improve my ability to earn, save and work towards my goals?
2. Give your money a purpose
Before discussing markets, it can help to group your money mentally by its intended use: everyday spending, emergencies, planned expenses and longer-term goals.
An annual insurance premium is a predictable expense, even though it does not come every month. Having to replace an appliance unexpectedly is an unplanned expense. Money for a purchase scheduled in two years faces different constraints from money for a distant project.
This distinction helps avoid treating your entire available balance as capital that can stay invested for a long time. Debts, their interest charges and payment dates also belong in the picture. An uncertain future gain and a contractual interest payment are different things.
A first exercise is to write down income, essential spending, regular commitments and savings actually available. The point is to make the constraints visible before thinking about returns.[1]
3. An emergency fund: room to handle the unexpected
An emergency fund is a reserve for events such as an urgent expense or a loss of income. Here, “fund” means money set aside: it does not necessarily mean an investment fund.
Its purpose is to provide breathing space. Without a reserve, an unexpected expense can force you to borrow or sell an investment after its value has fallen. Consob, Italy's securities regulator, includes emergency savings among its financial planning topics.[1]
There is no amount that suits everyone. Essential expenses, income stability, people relying on that income and other resources you can actually access all matter.
An example of the calculation, not a recommended reserve size. If essential expenses are €1,500 a month, a €6,000 reserve covers four months of those expenses. The calculation tells you what it covers; it does not establish that four months would be enough for that person.
For a reserve, the time needed to access the money, any restrictions and the risk of having less available than expected also matter. The central question is: “Will I be able to use this money when I need it?”
4. Goals and time horizon: the calendar comes before the chart
“I would like my savings to grow” is an intention. “I will need a certain amount by a certain date” makes the problem more concrete.
Your time horizon is the period before you need to use the capital. It does not automatically follow from your age: two people of the same age can have different needs, and one person can have several goals at once.[2]
More time may offer more opportunities to weather difficult periods, but it does not guarantee recovery from a loss. There is no number of years after which every investment becomes safe. The time available also changes: a goal ten years away today will be only one year away in nine years' time.
5. Risk is more than a line moving up and down
Price fluctuations are one part of risk. Others include an issuer failing to pay, difficulty selling, currency movements and a loss of purchasing power. “Low volatility” and “risk-free” are not synonyms.[3]
It helps to distinguish three aspects:
- Willingness to take risk: how much uncertainty you are willing to accept.
- Financial capacity to bear losses: what a loss would mean for your spending and goals.
- Understanding the investment: what you know about the mechanisms that can make it gain or lose value.
Feeling emotionally comfortable does not make a loss financially affordable. Having sufficient resources does not prevent distress when values fall. The distinction between psychological response and capacity for loss is also central to Vanguard's explanation of risk.[4]
Converting percentages into euros helps: a 20% fall on €2,000 is €400; on €100,000 it is €20,000. The percentage move is identical, but its effect on a person's life can be very different.
6. Where do returns come from?
Total return includes money received, such as interest and dividends, and changes in the investment's value. Looking only at payments into your account can be misleading. Dividends also depend on the company's decisions and circumstances: they are not guaranteed payments.[3, 29]
Example: an investment bought for €1,000 pays out €40 and is worth €930 at the end of the period. The total result is €930 + €40 − €1,000 = −€30, or −3%, before costs and taxes. Receiving money does not necessarily mean making a gain.
For a bond, the coupon rate applies to its face value; it does not automatically equal the return earned on the price paid. The purchase price, sale or redemption value and timing of payments also matter.[30]
The “eighth wonder”: a mechanism, not a promise
A famous saying, often attributed to Albert Einstein without reliable documentary evidence, describes compound interest as the eighth wonder of the world.[49]
“Compound interest is the eighth wonder of the world. He who understands it, earns it; he who doesn't, pays it.”
A saying commonly attributed to Einstein, but not authenticated: an introductory metaphor, not scientific evidence.
When investment proceeds are reinvested, they can contribute to subsequent returns. This is compounding. For funds and shares, “compound returns” is a useful term: not all investments pay contractual interest. Losses also reduce the base on which future returns can be earned.
The mechanism works once reinvested returns start generating further returns. There is no universal fifteen-year threshold. At a constant positive rate, the gap compared with not reinvesting grows gradually. How noticeable it becomes depends on the rate, time and cash flows.
Mathematical example: €10,000 initially, a constant hypothetical 5% annual rate, annual compounding and no additional contributions. In the first column, interest is set aside without earning anything further: total €10,000 × (1 + 0.05 × years). In the second: €10,000 × 1.05^years. Amounts rounded to the nearest euro; costs, taxes and inflation excluded. The 5% rate is not a forecast.
The amount shown in an account is nominal. Real value concerns what that money can buy. If capital grows by 3% in a year and prices rise by 2%, the real return is approximately 0.98%: 1.03 / 1.02 − 1.[5]
Try the mechanism: in Rebalix's compound interest calculator, you can change the capital, contributions, duration, assumed return and inflation. Change one input at a time and compare the nominal amount with its purchasing power. If you use monthly contributions, also check the compounding convention: the table above uses annual compounding.[50] Other tools, including those for Italian stamp duty and bond yields, are on the calculators page.
The smooth curve of a simulation isolates a mechanism. Markets can deliver positive years, negative years and long waits. Adding time or contributions changes the result, but neither always matters more than the other. A higher balance can also come from new savings rather than investment gains.
7. Cash and savings deposits: accessible does not mean risk-free
“Cash” can mean different things. Banknotes are physical money; a bank account balance is a claim against the bank. Both can lose purchasing power, but their custody risks and protections are different.
A fixed-term deposit does not necessarily allow early withdrawal. The advertised rate must be read alongside the term and conditions: a maturity date that does not fit an emergency limits its usefulness as a reserve.[36]
Products commonly called money-market ETFs are investments in fund units. They are not bank deposits and can lose value.
What does European deposit protection cover?
In the European Union, ordinary coverage for eligible deposits is harmonised at €100,000 per depositor per bank, through national deposit guarantee schemes. This is not a limit per account. Some temporary high balances receive additional protection, subject to the conditions and periods specified in the applicable rules. Switzerland and the United Kingdom have their own schemes: the EU limit should not automatically be applied across Europe.[37]
Example: €65,000 in a current account and €55,000 in a savings deposit with the same bank total €120,000: ordinary combined coverage remains €100,000. Two brands do not necessarily mean two banks. For joint accounts, each depositor's share is considered together with their other deposits at that bank.[38]
Italy has the FITD and a separate scheme for cooperative credit banks. For FITD member banks, ordinary reimbursement takes place within seven working days of the statutory trigger, subject to exceptions and possible deferrals. The depositor information sheet identifies the relevant scheme. Shares and bonds bought through a bank are not deposits covered by the FITD.[38]
Deposit protection does not mean immediate access to money in every situation, and it does not compensate for inflation. With hypothetical inflation of 3%, €10,000 earning no interest would have purchasing power equivalent to about €9,709 today after one year: €10,000 / 1.03.
What to check: who owes you the money, what restrictions apply and which protection scheme covers it. For residents of Italy, costs associated with accounts and deposits also include Italian stamp duty. The word “cash” in an app does not answer these questions on its own.
8. Bonds: lending money and reading the terms
When you buy a bond, you become a creditor of its issuer. The contract sets out the promised payments and redemption terms: fulfilment also depends on the issuer's ability to pay. Face value is the bond's contractual principal amount; price is what you pay to buy it. They can differ. The coupon is any periodic interest payment; maturity is the scheduled repayment date.[30] Other terms you may encounter at a broker are explained in the bond glossary.
For example, a bond with a face value of €1,000 and a 3% annual coupon pays €30 a year if the issuer meets its obligations. If you buy it for €1,050 and receive €1,000 at redemption, the €50 difference reduces the result from the coupons. Coupon and yield are not the same thing. The bond yield calculator illustrates the difference using the actual purchase price.
Three separate questions: who issues it, how does it pay, and what are its terms?
Categories overlap: a bond can be government-issued, fixed-rate and straightforward at the same time. “Plain vanilla” describes a conventional structure without particularly complex mechanisms; it does not certify the absence of risk.[39]
The EIB, for example, raises funds by issuing bonds in the markets. Its name identifies the issuer, not the coupon type or currency of an individual bond.[40] Separate guides cover European government bonds and Italian BTPs.
Corporate bond payment structures can be straightforward or part of more complex arrangements: the individual bond's terms remain decisive.[41] For step-up bonds, coupon increases are defined in advance.[42]
Terms that change the risk
A conventional convertible bond gives its holder the option to exchange the debt claim for shares on predetermined terms. Its value therefore also depends on the share price and conversion terms. It should not be confused with securities whose conversion can be mandatory or triggered by particular events.[43]
A call provision, allowing the issuer to redeem the bond early, can end coupon payments before the scheduled maturity: the holder may have to reinvest on less favourable terms. A subordinated bond ranks behind more senior claims and can suffer more severe losses if the issuer runs into difficulty. A simple structure, rising coupons or a high rating does not make these provisions irrelevant.[41, 44]
Risks to consider together
- Credit: non-payment, debt restructuring or a deterioration in the issuer's creditworthiness.
- Interest rates: other things being equal, a rise in the yield required by the market reduces a fixed-rate bond's price.
- Liquidity: difficulty selling quickly at a reasonable price.
- Currency: the result in your spending currency can differ from the result in the bond's currency.
- Inflation and reinvestment: money received may buy less; coupon payments may have to be reinvested at lower rates.[44]
Currency example: $1,000 is worth €1,000 when one euro buys one dollar. If one euro later buys $1.10, the same $1,000 is worth about €909. This calculation isolates the exchange-rate effect, without coupons or costs.
Credit ratings: opinions, not guarantees
A rating is an opinion on credit quality. It can change and does not capture every risk. The distinction between investment grade and speculative grade separates bands of credit quality; an unrated security is not automatically reliable or unreliable. It also matters whether the rating covers the issuer or that particular issue. Ratings do not measure currency risk or price fluctuations caused by interest rates.[45]
Duration: why maturity is not enough
Maturity tells you when repayment is scheduled. Duration also takes the timing of cash flows into account. Modified duration is one measure used to estimate price sensitivity: other things being equal, a higher value implies greater sensitivity to changes in required yield.[46]
Approximate example: modified duration of 5 and a one-percentage-point rise in required yield suggest a price change of about −5%; a one-point fall suggests about +5%. This is a local approximation, not a forecast or a loss limit: large changes and bonds with embedded options require greater care.
What to check: issuer, currency, cash flows, price, maturity, seniority and contractual provisions. For an individual security, the bond register provides coupon and maturity information and, for Italian residents, tax treatment. “I will hold it to maturity” does not remove the risk that the borrower fails to pay or that repayment has lost purchasing power.
9. Individual shares: owning part of a business
A share represents part of a company's equity. Unlike a bond, it normally has no date on which the invested capital must be repaid. Returns can come from dividends and changes in the share price. Dividends are not guaranteed.[29]
Prices reflect expectations of future performance as well as market conditions. Even a familiar business can disappoint: paying a high price for overly optimistic prospects can lead to losses. With an ordinary, unleveraged share purchase, you can lose the entire amount invested.
Risk comes both from the company, including its products, debt and management, and from broader factors such as recessions and interest-rate changes. Spreading investments across companies can reduce dependence on one business; it does not prevent many share prices from falling together.[29]
Not all shares carry the same voting or economic rights. For unlisted shares, finding a buyer and assessing a price can also be harder.[29]
What to check: the company's activities, rights attached to the share class, financial strength, valuation and the position's weight in your portfolio. A familiar name is no substitute for analysis.
10. Investing in gold: price and custody both matter
Gold pays no interest or dividends. The financial outcome depends on the resale price compared with the cost of buying and holding it. “Safe haven” does not promise price stability: gold can also lose substantial value and take years to recover. It does not automatically protect against inflation in every period.[47]
Physical metal or a financial instrument?
Physical gold. For bars and coins, authenticity, purity, documentation and the seller's reliability matter. The resale price can be lower than the purchase price even if the market quotation is unchanged. Storage, insurance and transport can cost money; direct possession exposes you to theft or loss. If someone else holds the metal, understand ownership, identification of the metal, withdrawal rights and insurance cover.[48]
Gold-linked financial instruments. Their terms can differ substantially from directly owning a bar. Read about the legal structure, any metal backing, custodian, investor rights, costs and counterparty risk. Exposure to the gold price does not automatically mean a right to take delivery of the metal.[48]
For someone measuring wealth in euros, the result also reflects conversion of the international gold price: an exchange quotation in euros does not, on its own, establish that currency exposure is hedged.
What to check: what you legally own, purchase and resale costs, where it is held and how the price can change. Listed gold-related instruments are compared on the gold ETFs and ETCs page. Jewellery and collectibles also have price components beyond their gold content.
11. Funds and ETFs: one structure, many possible exposures
A fund pools capital from multiple investors and invests it according to a stated policy. Buying units gives you a share in the performance of the fund's assets. An ETF is an exchange-traded fund: some track an index, while others are actively managed.[12] The Rebalix ETF guide explains, chapter by chapter, how an ETF works and the differences between ETFs, ETCs and ETNs.
The structure alone does not determine the risk. A fund can spread investments across many issuers or concentrate on one sector or region. Understanding what it holds comes before counting its securities.
A conventional bond ETF can continually replace its holdings and may have no maturity date on which it returns a predetermined amount of capital. It is therefore not the same as holding an individual bond to redemption. Even funds with an end date require a reading of their terms: the date alone does not guarantee the capital.
What to check: investment policy, exposures, concentration, costs and documentation. Knowing the individual ingredients finally makes it possible to understand the recipe.
12. Active and passive management: what are we actually comparing?
A passive fund aims to track an index under a stated methodology. An active fund makes investment decisions within its mandate: it may seek to outperform a benchmark, contain certain risks or pursue other objectives. A stated objective does not guarantee achievement.[52]
Using passive ETFs does not remove decision-making. Choosing markets, currencies and weights already creates an exposure; changing them to anticipate market movements is an active decision. Rebalancing under predetermined rules does not necessarily involve forecasting.
An index also embodies choices: eligibility criteria, weights and review frequency. “Passive” describes how those rules are followed; it does not mean risk-free or automatically suitable for every goal. Separate pages explain passive, smart beta and active ETFs and physical and synthetic replication.
SPIVA: a source for understanding the comparison
SPIVA is research published by S&P Dow Jones Indices comparing active funds with benchmarks across categories and periods. Its methodology includes funds that have closed or merged, rather than looking only at survivors. In its public overview, S&P DJI describes recurring difficulty among active funds in beating benchmarks, with differences and exceptions across markets and periods. This is research by an index provider, and that provenance should be stated.[51]
Useful questions when reading a result are: which category, currency, period, index and costs are included? An index is not an investable product; a tracking fund incurs costs and can diverge from it.
These comparisons do not establish that every active fund will lose to every passive fund, nor do they identify future winners. On their own, they do not assess the overall usefulness of an advisory service. Understanding the mandate, exposures, costs and risks remains necessary, without turning a historical statistic into an individual promise.
Further reading: SPIVA's public overview and methodology. This discussion is conceptual; it reproduces no tables or charts from the reports.
13. Diversification and simplicity: exposures matter
Asset allocation describes how much capital is assigned to different asset classes. A “60/40” mix can mean 60% shares and 40% bonds, but you still need to specify which markets, currencies and instruments it represents.
Diversification spreads exposure across different investments. It can reduce some concentration risks, but it does not eliminate the possibility of loss. The number of products alone does not measure diversification.[13]
Three ETFs can hold largely the same companies. Adding a US ETF to a global one can increase exposure to the United States rather than add a missing market. Vanguard specifically highlights the risk of overlap between funds.[14] The MSCI World and MSCI ACWI guides explain which companies and countries make up widely used indices.
Simplicity helps when it makes each component's role clear. Unnecessary complexity can add costs, monitoring and decisions without a clear benefit. But a single product is not automatically easy to understand, diversified or low-risk.
Useful questions are: what exposure does this instrument add? What risk does it introduce? Which part of the portfolio already does something similar?
There is no need to arrive at one ideal number of ETFs for everyone. What matters is understanding the whole, even when each individual part looks interesting.
14. How long might it take? A question that needs careful measurement
There is no scientific table assigning a “safe” number of years to every portfolio. Studies and historical data exist, but the result depends on what is measured: price or returns including dividends, euros or dollars, nominal capital or purchasing power, a lump sum or subsequent contributions. Levy (2024), for example, studies the relationship between time horizon and choices under uncertainty: the conclusions depend on assumptions and investor preferences. It does not provide one universal holding period for everyone.[21]
First measure: how long did recovery from a previous peak take? We analysed NYU/Damodaran annual returns from 1928 to 2025. The combinations below simulate US shares and ten-year US Treasuries, with weights reset each year.[22]
“Real” means adjusted for US inflation. At the end of 2025, the 40/60 mix was still about 3.1% below its end-2021 real peak: an ongoing episode does not yet have a final duration.
Second measure: at the end of a period, was the capital worth less than the starting amount? We can examine all windows beginning at year-end in the sample, even where the capital rose above its starting value in the meantime.
This is why a maximum recovery time of 14 years can coexist with fifteen-year windows ending in a loss: a window may contain an intermediate recovery followed by another fall. The windows overlap; these counts are not future probabilities. No observed cases does not mean no risk.
How to read the data. Returns are in dollars, with dividends included and annual compounding; no costs, taxes, contributions or withdrawals. Inflation is US inflation. The bond series is constructed from yields and changes in ten-year Treasury rates: it does not represent a global bond ETF. Annual observations do not capture daily peaks and troughs, including the 1929 peak. The modern S&P 500 was launched in 1957: earlier data reconstruct US large-cap equities.[22, 23]
It would therefore be incorrect simply to write “since 1928, the S&P 500 has stayed below its previous peak for no more than eight years”. The figure depends on the definition. These tables do not assign a suitable allocation to the reader either: they show why currency, inflation and the date of an expense change the question. A historical result places no limit on future losses or recovery times. The annual returns CSV, calculation script and results are published alongside the guide.
15. Why −50% and +50% do not cancel out
Start with €10,000. After a 50% loss, €5,000 remains. A subsequent 50% gain applies to that €5,000: the result is €7,500.
To return to €10,000, the remaining capital must double: a gain of 100% is needed.
Rebalix mathematical calculation. Percentages rounded to one decimal place. No contributions or withdrawals; costs, taxes and inflation excluded. The table shows the gain required, not whether or when it will occur.
The formula is required gain = loss / (1 − loss), expressing the loss as a positive decimal. For example, 0.20 / 0.80 = 0.25, or 25%.
This asymmetry also explains why a simple average can mislead: −50% and +50% have an arithmetic average of zero, but the capital has fallen by 25%.
The duration of the loss matters too. Returning to the starting amount after many years is not the same as having had it available throughout, and does not necessarily restore its purchasing power. Finally, a 100% loss wipes out the capital: no finite percentage gain on what remains can rebuild it.
This asymmetry is also discussed in The four myths that keep you from investing.
16. Your mind invests alongside your portfolio
We do not make decisions using only formulas and documents. Emotions and mental shortcuts influence what we notice and how much weight we give it. Behavioural finance also studies these departures from perfectly rational reasoning.[6]
Risk aversion and loss aversion are different. The former concerns a preference for greater certainty; the latter describes the particularly strong impact a loss can have compared with an equivalent gain. There is no need to assign everyone the same emotional multiplier.[7, 8]
Some traps become easier to recognise when expressed as familiar thoughts:
Illustrative examples of behaviour, not a psychological test. Further reading:[6, 8, 9].
The market does not know our purchase price and has no obligation to bring us back to break-even. A fall in portfolio value exists before a sale; selling can have tax and practical consequences, but does not create that loss from nothing.
A small exercise can help: write down the reason for a decision and ask what information could disprove it. If the answer is “none”, perhaps we are defending a belief rather than examining an investment.
17. The blindfolded monkey: a provocation, not an investment method
In A Random Walk Down Wall Street, published in 1973, Burton Malkiel imagined a blindfolded monkey selecting shares by throwing darts and achieving results comparable with those of experts. It was a provocation about the difficulty of picking winning stocks. The Wall Street Journal later organised a contest inspired by the idea, making clear that it had never used an actual monkey.[10]
The story does not establish that random investing is prudent or that every professional is useless. The more interesting question is: does a positive result demonstrate skill, or could it also reflect luck?
Assessing that requires context, risk, costs and an appropriate comparison. A portfolio of a few randomly selected shares can be highly concentrated. One lucky forecast remains one lucky forecast: it does not validate the next ones.
18. Market timing: deciding when to exit and when to return
Market timing means changing exposure in an attempt to anticipate market movements. “I will get out before the fall and back in before the recovery” looks straightforward on a chart of events that have already happened.
Before those events occur, both decisions are uncertain. Vanguard's historical analysis shows that very strong and very weak trading days can cluster in the same turbulent periods. Staying out to avoid the latter can mean missing the former.[11]
This does not prove that no strategy can ever succeed. Nor does a chart excluding only the best market days establish a general conclusion on its own: it selects an unfavourable scenario with hindsight. A serious comparison would need rules defined in advance, costs and observable results.
Risk management has other motivations too. Changing an allocation because an expense is approaching or income has changed is not the same as predicting the next downturn. The reason for the decision matters as much as the trade.
19. Reading an ETF: a short checklist
Before focusing on past returns, you can examine the following information:
Funds with similar names can track different indices, for example including or excluding smaller companies or emerging markets.[15]
Buying a listing quoted in euros does not automatically remove the currency risk of the underlying investments. A currency-hedged share class has specific characteristics to check in its documents.
The KID is the key information document: it helps you examine risks and costs, but does not replace the prospectus or an understanding of the product. The summary risk indicator is not a guarantee, and performance scenarios are not promises.[12, 16]
For the ETFs it covers, Rebalix brings together holdings, KID-declared costs and tracking difference where available, identifying sources and missing data. Start with the ETF screener. Tracking difference measures how far a fund's return has diverged from its index; the relationship between exchange prices, NAV and market makers is explained in this ETF guide chapter.
20. Can small costs become large?
Costs reduce the capital left invested. Over time, the returns that money can no longer generate matter too. Future returns are uncertain; many costs, however, can be identified before investing.[17]
A purely hypothetical example: €10,000, twenty years, a constant gross annual return of 4%. For simplicity, each year we subtract the cost, expressed in percentage points, from the gross return.
Calculation: €10,000 × (1 + 0.04 − cost)²⁰. Difference: approximately €3,711. No contributions or withdrawals; taxes and inflation excluded. The model does not reproduce a fund's daily charging of costs and does not represent actual products.
A fund's ongoing charge is not the only expense an investor may face. There are also intermediary fees and bid–ask spreads: the difference between the available buying and selling prices. Conditions depend on the service and market.[15] The ETF guide chapter on liquidity, spreads and orders explains how to read them.
From estimated costs to costs actually incurred. Before purchase, the KID and service disclosures help identify expected expenses. Afterwards, the annual costs and charges statement lets you check the costs actually incurred for products and services, including any advice and custody charges. Some costs are deducted within the product and do not appear as a separate debit on your account. If entries are unclear, you can ask the intermediary for a breakdown.[31]
Comparisons make sense between comparable exposures and services. A cheaper product does not become equivalent to one investing in different assets simply because it costs less.
How much do costs weigh over time?
Change the assumptions: both alternatives share the same gross return and the same contributions. Only the annual cost differs.
Total capital contributed: 10,000 €. Final amounts are nominal, rounded to the euro.
An educational simulation, not a forecast. To isolate costs, the net annual return is approximated as gross return minus annual cost. It is converted into an equivalent monthly rate; contributions are made at month end. Costs are a percentage of capital, with no fixed fees or entry/exit charges. No taxes, inflation or market swings. The difference includes both the costs and the compounding they forgo; it is not the sum of fees charged.
Year-by-year values
| Year | Capital contributed | Alternative A | Alternative B |
|---|---|---|---|
| 0 | 10,000 € | 10,000 € | 10,000 € |
| 1 | 10,000 € | 10,380 € | 10,280 € |
| 2 | 10,000 € | 10,774 € | 10,568 € |
| 3 | 10,000 € | 11,184 € | 10,864 € |
| 4 | 10,000 € | 11,609 € | 11,168 € |
| 5 | 10,000 € | 12,050 € | 11,481 € |
| 6 | 10,000 € | 12,508 € | 11,802 € |
| 7 | 10,000 € | 12,983 € | 12,133 € |
| 8 | 10,000 € | 13,477 € | 12,472 € |
| 9 | 10,000 € | 13,989 € | 12,821 € |
| 10 | 10,000 € | 14,520 € | 13,180 € |
| 11 | 10,000 € | 15,072 € | 13,550 € |
| 12 | 10,000 € | 15,645 € | 13,929 € |
| 13 | 10,000 € | 16,239 € | 14,319 € |
| 14 | 10,000 € | 16,856 € | 14,720 € |
| 15 | 10,000 € | 17,497 € | 15,132 € |
| 16 | 10,000 € | 18,162 € | 15,556 € |
| 17 | 10,000 € | 18,852 € | 15,991 € |
| 18 | 10,000 € | 19,568 € | 16,439 € |
| 19 | 10,000 € | 20,312 € | 16,899 € |
| 20 | 10,000 € | 21,084 € | 17,372 € |
21. Regular investing or a lump sum? First ask when the money is available
A lump-sum investment generally puts an available amount to work in one go; a regular investment plan makes purchases over time. In Italian these are commonly called PIC and PAC respectively. But asking which is “better” combines two different situations.
In the second case, gradual entry reduces initial exposure. An immediate fall affects less capital; an immediate rise benefits less capital. The outcome also depends on interest earned on the waiting cash, trading costs and the date chosen to compare results.
What do the studies say?
Academic research does not establish a universal advantage for gradual investing. Constantinides (1979) analyses the suboptimality of dollar-cost averaging within his model. Trainor (2005) also studies losses along the way: under the assumptions examined, spreading purchases can reduce their probability, size and duration. These are different questions from a comparison of final capital alone.[19, 20]
A transparent empirical example. Vanguard (2023), research by an asset manager rather than an independent academic study, compares immediate investment with three equal monthly instalments. Across one-year windows using the MSCI World from 1976 to 2022, lump-sum investing comes out ahead in 68% of cases. The comparison assumes a 100% equity allocation and no interest on the waiting cash: it does not concern three years of contributions or future monthly savings.[24]
The 68% figure is not a forecast and does not mean that immediate investment is always suitable. Returns, risk along the way and the ability to follow the plan are different criteria. An entry method does not make an otherwise unsuitable exposure appropriate.
An average purchase price does not remove losses
€100 buys 10 units at €10; another €100 buys 20 units at €5. That is 30 units costing €200: an average price of about €6.67. If the unit price is still €5, the holding is worth €150: a 25% loss before costs.
Regular investing buys different quantities at different prices. It does not ensure that the price will recover, automatically protect capital or determine how much risk you are taking on its own.
22. Before your first order
Understanding the product is one part of the process. The other is understanding the service: the intermediary's identity and authorisations, costs, documentation, how orders work and tax obligations. Checks should be made against the relevant official registers, not just a logo displayed on a website.[16]
A market order prioritises execution at the available price, which may differ from the price you saw a moment earlier. A limit order sets a maximum buying price or minimum selling price, but may not execute. Before using an intermediary's feature, it helps to read its terms.[18]
Tax treatment also depends on residence, product and service: a general guide cannot automatically determine individual rates or filing obligations. “Zero commission” does not necessarily mean no costs at all. The commission-free broker tracker records offer terms and limitations month by month.
The MiFID questionnaire is not an exam to pass. Answers about knowledge and experience should reflect reality. For investment advice and portfolio management, the suitability assessment also considers financial circumstances, the ability to bear losses and objectives. Appropriateness, required for other services where applicable, concerns the knowledge and experience needed to understand the risks: it does not establish that an investment suits your goals. Protections depend on the service; an executed order is not itself a recommendation.[32, 33]
Promises of certain profits, pressure to transfer money quickly and evasive explanations are reasons to investigate, not take shortcuts.
23. Tax: Europe does not have one investment tax rate
Investment taxation is not uniform across the European Union. Tax residence, the type of income, the product and national rules matter. Cross-border situations can also involve withholding taxes in the source country and double-tax treaties. A table showing a single percentage for each country would often be misleading.[25]
Understanding net returns requires practical questions: which income is taxed, and when? Which losses can be offset? Who applies the tax, and what reporting remains the investor's responsibility? Wealth taxes and foreign-asset reporting obligations can also matter. Using a foreign intermediary does not automatically bring a tax advantage.
An Italian example: what does “white list” mean?
For an individual who is tax-resident in Italy and invests outside a business activity, many types of financial income are generally taxed at 26%. Italian government securities and equivalent instruments, and foreign government securities meeting the applicable requirements, retain 12.5% treatment. The white list concerns adequate exchange of tax information: it is not a certificate of the issuer's safety.[26]
For a fund or ETF, preferential treatment may apply to the portion of proceeds attributable to eligible government securities, based on the reported tax percentages and applicable rules. Being a “bond ETF”, or being domiciled in a listed country, is not enough to apply 12.5% to its entire return.[26, 27] ETF-specific percentages from issuers' tax documents are collected in the white-list database.
This section describes a general mechanism; it does not calculate anyone's personal tax liability. Rates, income categories and obligations require an up-to-date check. Tax affects net returns, but a lower tax rate does not make an investment less risky.
24. Follow the plan without switching off your judgement
A portfolio changes even without new purchases. If some components grow more than others, their weights change. Rebalancing brings the allocation back towards a predetermined mix; it can involve trades, costs and tax consequences. It does not guarantee higher returns.[17] Measuring how far an allocation has drifted from its intended weights is one of Rebalix's app features; deciding whether and how to act remains the investor's choice.
Reviewing a plan also means checking whether your goals are still the same. Moving home, losing income or bringing an expense forward can change the constraints.
A portfolio you can live with
Portfolio Charts offers a useful idea: assess a portfolio partly through its relationship with life goals and emotions during difficult periods. Average returns alone do not describe that relationship. This is an editorial perspective, not academic proof.[28]
Three further questions can help:
- If the capital fell as an expense approached, what practical consequences would that have?
- Do I understand why each component is there, even when one disappoints?
- How much time and attention does managing the portfolio require? Could I sustain that commitment?
Understanding the plan can help you follow it. Feeling comfortable, however, does not prove risk is low: a familiar portfolio can be concentrated, and a favourable history can create too much confidence.
Discipline does not mean stubbornness. Avoiding a change at every news headline is different from keeping an investment you no longer understand or that no longer meets your needs. Similarly, checking an app constantly is not the same as controlling risk.
Two topics to explore according to your goals
Supplementary pensions. If the goal concerns retirement, planning also includes expected pension income and any supplementary pension provision. Restrictions, contribution arrangements, costs and access rules deserve a separate reading: the Bank of Italy directs readers to educational material from COVIP, Italy's pension fund supervisory authority.[34] Rebalix also has a guide to supplementary pensions in Italy.
Sustainability preferences. These can be considered alongside financial objectives. A “green” label does not remove the risk of loss: understand the criteria and documented commitments behind it. A green bond retains the financial risks of a bond and can also be associated with misleading environmental claims, or greenwashing.[35]
25. Questions to take with you
Before making a decision, this short list can help identify what is missing:
- Do I know what this money is for and when I will need it?
- Have I distinguished unexpected expenses from planned ones?
- Do I understand how this investment can lose value?
- Have I converted at least one possible fall into euros, without mistaking it for the maximum possible loss?
- Do I know what it holds and what it adds to the exposures I already have?
- Have I read the costs, restrictions and essential documents?
- Can I distinguish cash received from total return, and do I know where to check the costs incurred?
- Is my decision driven by a goal or by fear of missing out?
- Could I explain the choice in my own words?
The answers do not generate a risk profile or assign a suitable investment. They help make your questions more precise, including when you decide to consult an adviser.
Investing means living with some uncertainty. Understanding costs, risks and constraints helps distinguish what you can decide from what you can only observe. The monkey can stay in the illustration. Decisions deserve an explanation.
Frequently asked questions
How much money do you need to start investing?
There is no starting amount that suits everyone. Minimum transaction sizes and whether costs are proportionate depend on the product and intermediary. Start by identifying everyday expenses, emergencies and planned spending. With modest amounts, saving more can matter more than chasing a higher return.
How large should an emergency fund be?
There is no amount that fits everyone: essential expenses, income stability, dependants and other accessible resources matter. A €6,000 reserve covers four months of €1,500 expenses. The calculation tells you what it covers, not whether four months would be enough.
After how many years does an investment become safe?
Time alone never guarantees safety. In the guide’s US equity sample for 1928–2025, the longest completed inflation-adjusted recovery measured between year-end observations took 14 years. Some fifteen-year windows still ended with a real loss. These are historical dollar-based results, not limits on future recovery times or probabilities of future loss.
Is it better to invest regularly or all at once?
First distinguish new savings from money already available. Savings arriving each month can be invested progressively or allowed to accumulate. For an existing lump sum, gradual entry reduces initial market exposure and changes risk during the entry period; it does not eliminate the risks of the investments purchased. Research does not establish a universal advantage for gradual entry.
Why does a 50% gain not offset a 50% loss?
The gain applies to the remaining capital. A 50% loss reduces €10,000 to €5,000; a subsequent 50% gain brings it to €7,500. Returning to €10,000 requires a 100% gain. The formula is loss / (1 − loss), expressing the loss as a positive decimal, with no contributions or withdrawals.
How much can ETF costs matter over time?
In the guide’s hypothetical example, €10,000 invested for twenty years at a constant 4% gross annual return grows to about €21,084 with an annual cost of 0.2%, or €17,372 with a cost of 1.2%. The difference is about €3,711 before taxes and inflation, using the simplified gross-return-minus-cost model and no additional contributions. The simulator lets you change the inputs.
Sources and further reading
Sources consulted on 9 October 2026 for the original Italian edition. Material from issuers and asset managers is used as an educational source, with no collaboration or endorsement. Numerical examples, tables and charts are Rebalix’s own work. Some sources are in Italian; their original titles are retained below.
Show the 52 sources
- Consob — La pianificazione finanziaria.
- Vanguard — Investment portfolios: asset allocation models.
- Banca d’Italia — Cosa sapere prima di investire.
- Vanguard — How do I work out my attitude to risk?.
- Banca d’Italia — Risparmi e inflazione, cosa c’è da sapere.
- Banca d’Italia — Introduzione alle trappole comportamentali.
- Banca d’Italia — Avversione al rischio.
- Banca d’Italia — Come valutiamo un prezzo.
- Banca d’Italia — L’eccesso di fiducia and Consob — Do investors rely on robots?, on confirmation bias.
- The Wall Street Journal — A Brief History Of Our Contest, 1998. Paywalled: a full reading is not attested; secondary confirmation: The Daily Princetonian — Fourteen years of darts on Wall Street lead Malkiel to reassert stock theory, May 2002: the contest, which ran for fourteen years, was conducted by WSJ journalists, with Malkiel throwing the first dart. Literary origin: Burton G. Malkiel, A Random Walk Down Wall Street, first published in 1973.
- Vanguard — Why to focus on long-term market results.
- Consob — I fondi comuni.
- Banca d’Italia — La diversificazione ingenua and Diversificazione.
- Vanguard — 9 ETF beginner mistakes you should avoid.
- Vanguard — How to choose an ETF.
- Consob — Hai deciso di investire: cosa devi fare?.
- Vanguard — I principi per investire con successo and research in English.
- SEC, Investor.gov — Types of Orders. Source for general definitions; check execution terms with your intermediary.
- Constantinides (1979), A Note on the Suboptimality of Dollar-Cost Averaging as an Investment Policy, JFQA.
- Trainor (2005), Within-horizon exposure to loss for dollar cost averaging and lump sum investing, Financial Services Review.
- Levy (2024), Choices under uncertainty and the investment horizon, Annals of Operations Research.
- NYU, Aswath Damodaran — Historical Returns on Stocks, Bonds and Bills and original workbook. Tables and chart: Rebalix calculations, 1928–2025 sample.
- S&P Dow Jones Indices — The S&P 500 and the Dow.
- Vanguard (2023), Cost averaging: Invest now or temporarily hold your cash?.
- European Union, Your Europe — Income taxes abroad.
- Agenzia delle Entrate — Circolare 19/E, 27 giugno 2014.
- Rebalix — Tassazione ETF e white list: white-list percentage and effective tax rate by ISIN, from tax documents published by issuers.
- Portfolio Charts — Find a Portfolio to Love, 9 July 2019. Editorial inspiration on the relationship between portfolios, goals and emotions; not used in the historical calculations.
- Banca d’Italia — Azioni.
- Banca d’Italia — Obbligazioni.
- Banca d’Italia — Quanto costa la gestione degli investimenti.
- Banca d’Italia — Questionario MiFID e preferenze di sostenibilità.
- ESMA — MiFID II, articolo 25: adeguatezza e appropriatezza.
- Banca d’Italia — Pianificazione.
- Banca d’Italia — Obbligazioni sostenibili.
- Banca d’Italia — Conto di deposito.
- EBA — Deposit Guarantee Schemes data and additional information.
- FITD — Domande frequenti and depositor protection.
- Intesa Sanpaolo — Le obbligazioni plain vanilla. An issuer source, used for the definition.
- European Investment Bank — Investor relations.
- Borsa Italiana — Le obbligazioni corporate e gli altri titoli di debito.
- Borsa Italiana — Obbligazione Step Down/Step Up.
- Borsa Italiana — Obbligazioni convertibili.
- SEC, Investor.gov — Bonds. Educational material on risks; US legal rules are not extended to Europe.
- SEC, Investor.gov — The ABCs of Credit Ratings.
- FINRA — Duration: What an Interest Rate Hike Could Do to Your Bond Portfolio.
- Banca d’Italia — Cosa sapere prima di comprare oro.
- CFTC e FINRA — 10 Things to Ask Before Buying Physical Gold, Silver, or Other Metals. Used for purchase and custody risks and costs, not for US tax or pension rules.
- Quote Investigator — The Eighth Wonder of the World Is Compound Interest. Examines the attribution; does not establish Einstein as the author.
- Rebalix — L’interesse composto: cos’è, e quanto vale davvero, con calcolatore.
- S&P Dow Jones Indices — About SPIVA. Public overview and general methodology; no proprietary table or chart reproduced.
- Banca d’Italia — Fondi comuni di investimento, the distinction between active and passive management.