A friendly retirement calculator for estimating income, tax, asset drawdown and probability of success — UK Tax 2025/26
Add any other asset category such as a General Investment Account, second home, property equity, business sale proceeds or other investments. A default Second Home line is included so you can capture its value now. In a future version this can be modelled as an optional sale to help fund retirement; for now, custom assets are included as additional retirement resources after ISAs.
Enter what you expect to keep saving each year before retirement. Leave as zero if you are already retired or do not plan to add more.
Also enter your view of asset growth rates. The defaults are equity/pension/ISA growth at 7%, cash at 3.5% and inflation at 2.5%.
Secondly — enter how much net annual income you are trying to achieve each year (note this will go up with inflation each year). Also enter how long you hope to live for using the plan-to age.
Runs random market-return paths around the selected Pension/ISA growth assumption to estimate the probability of reaching age without exhausting assets. The flexible-withdrawal result allows annual spending to be temporarily reduced in weaker markets, which can materially improve survival odds.
Fixed success means the full dashboard withdrawal path is funded every year. Flexible success means the household funds at least the selected minimum flexible goal while cutting withdrawals after negative-return years. This is a planning model, not a forecast or financial advice.
Returns are sampled from a log-normal model using the selected nominal growth rate as the average expected annual return.
10th, median and 90th percentile ending assets by age
Fixed vs flexible withdrawals at plan end
Average annual portfolio withdrawal under fixed vs flexible paths