The assumptions are the point.
Each model year applies your chosen growth rate to the pot, then deducts the selected percentage fee. The same rates repeat every year. The formula is starting pot × [(1 + growth/100) × (1 − fee/100)] raised to the number of years.
There are no new contributions, withdrawals, taxes, inflation, fixed charges or transaction costs. Actual investments fluctuate and real schemes may charge differently. The default growth is zero: it is an illustrative setting, not a forecast. Fees A and B are made-up inputs and do not represent provider prices.
Lower fees do not, on their own, establish a pension’s suitability. Benefits, guarantees, investment choices and other charges are outside this model. Do not use it to decide to transfer a pension.
Where this fits
Illustrate growth with monthly additions →
This tool illustrates an invested pot. It does not value a defined benefit pension or estimate retirement income. Read about the difference between pension types →
Explore inflation and buying power separately →
Model prepared 3 October 2026. General information, not financial advice. Inputs stay on this page and are not stored.