Investment Returns After Fees, Taxes, and Inflation

First account for investment costs

Assume €10,000 grows for 20 years at a constant 5% annual return before fees. With no contributions or withdrawals, the balance would be about €26,533 before tax.

To illustrate fees, we subtract an annual percentage fee from the assumed annual return, matching the simplified convention used by our calculators. Actual fee collection can work differently.

Charges reduce both today's balance and the money left to earn future returns. The SEC's explanation of investment fees illustrates that cumulative effect. Also check transaction charges, platform fees, and any currency conversion costs that are not included in an annual percentage.

Then distinguish the balance from cash after tax

Take the 0.3% fee case. The unrounded balance is €25,057.26, which includes the original €10,000. The gain is €15,057.26.

If a hypothetical flat 25% capital gains tax applies only when the investment is sold, tax on that gain is about €3,764. Cash after selling is about €21,293. The original investment is not taxed again in this simplified example.

That tax rate and timing are assumptions, not universal rules. Some countries or accounts tax dividends along the way, exempt certain gains, or apply allowances and different rates. Earlier taxes can reduce the amount left invested, making the final result different.

Our calculators use the flat rates you enter and simplified tax treatment. They cannot determine an individual's actual liability or model every account type.

Convert to purchasing power if needed

Inflation is a broad rise in prices that reduces what a given amount of money can buy. The European Central Bank's inflation explainer describes this distinction.

If prices rise at a hypothetical 2% annually for 20 years, €21,292.95 at the end has purchasing power equivalent to about €14,330 at the start.

Value in starting-year money = future amount ÷ (1 + inflation)^years

This is a different view of the same future cash, not an extra fee deducted by a provider. Your actual spending basket may also change differently from a broad inflation measure.

Understand the calculator's displayed result

The calculator pages show nominal amounts: future euros without an inflation adjustment. They include the annual investment fee assumption in growth.

With Sell everything at the end turned off, investment portfolios are shown without deducting a future capital gains tax. Turning it on deducts the entered tax on modeled gains and, for property, selling expenses and the entered tax on the home gain.

Those settings affect the question being answered. A retained portfolio value and cash after liquidating it can both be useful, but they are not interchangeable. Similarly, nominal money and inflation-adjusted money should not be mixed in a comparison.

Check assumptions in the same order

Start with a return before fees. Subtract the costs the model supports, choose whether you are comparing retained assets or sale proceeds, and apply the relevant tax assumptions. If you want purchasing power, adjust both options consistently for inflation.

Use more than one return scenario. A detailed calculation at a single constant rate remains sensitive to that rate and cannot reproduce market volatility. The model can clarify the arithmetic while your actual outcome remains uncertain.

Keep notes on which costs you have included so you do not subtract the same fee or tax twice when reviewing the result.