Investment growth, fees and inflation: three numbers worth separating
Compare contributions, hypothetical growth and purchasing power without treating a return assumption as a promise.
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Separate what you add from what the model earns
A final investment balance combines your starting money, later contributions and assumed growth after the modeled fee. Looking only at the total can obscure the contribution you made yourself. Our results show total paid in alongside the projected balance so the difference is visible.
Check a simple one-year example
Start with 1,000 and make no further contributions. At a hypothetical 10% effective annual return with no fee, the ending balance is 1,100. Apply a 1% annual asset fee using our multiplicative convention and the result is 1,089. That is 1,000 multiplied by 1.10 and then 0.99. Real products can assess fees differently, so use the method statement rather than assuming every calculator treats fees identically.
Distinguish future money from purchasing power
A nominal balance is expressed in future currency units. A today’s-money estimate divides it by cumulative assumed inflation. In a simple example, a balance growing by 10% for one year while prices also rise by 10% keeps the same modeled purchasing power before fees and tax. Neither the return nor inflation rate in that example is a forecast.
Understand contribution timing
The tool adds contributions at the end of each month. A payment made at the beginning of a month has more time to grow, so another convention can produce a different result. Keep contributions, horizon and timing consistent when comparing cases. Country selection changes the currency label; it does not apply tax shelters, account limits or exchange rates.
Use a range and record the limits
Try a lower return and a higher fee, and compare the result with your baseline. Constant returns cannot reproduce market volatility or guarantee an outcome. The calculator does not select investments, assess risk tolerance or calculate tax. Its value is in making the arithmetic and assumptions visible before you seek product-specific information.
Try the related calculator
Use your own assumptions to explore the example. The calculator states its scope and exclusions.
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Sources checked on the article date. Illustrative values are fictional. No current-rate, individualized-advice or ranking claim is made.