How to read pension calculator results
A pension calculator can help you see how contributions, investment growth and your retirement date might affect your savings. Its results are illustrations based on assumptions. They’re not a prediction of your future pension or a recommendation about what to save.
Two calculators can give different answers from similar inputs. So before you compare their results, check what each one assumes.
Check what the contribution figure means
Is the calculator asking for your payment, or the total going into the pension after tax relief? With relief at source, a qualifying £80 personal payment gets £20 basic-rate tax relief, making £100 in the pension. Mixing up those two figures changes the result. HMRC: pension tax relief.
For example, £50 plus 5% of £2,000 is £150. If a calculator lets you use both a fixed payment and a percentage rule, check whether it adds them together or treats them as alternatives. This calculation is only an illustration, not a suggested contribution.
Also check whether a percentage is based on turnover, profit or take-home income. Each is a different starting point. A calculation based on profit doesn’t necessarily allow for personal tax, household bills or money you need for a quiet month.
Does a one-off payment really happen only once?
Check whether your pattern of contributions repeats every year, goes up over time or stops at a particular age. If you enter a lump sum in a sample year, the model might repeat it, even if you only meant to pay it once.
Make sure the assumptions match the situation you want to explore. A payment that repeats and a genuinely one-off payment can lead to very different illustrations.
Read growth, fees and inflation together
Look for the investment growth it assumes, the fees it takes off and how it handles inflation. A result in today’s money has been adjusted for the model’s inflation assumption. A figure in future cash may look bigger without giving you more spending power.
An assumed return isn’t a promised return. Investment values can go down as well as up, and you may get back less than you invest. Trying a lower growth setting shows you one different scenario. It doesn’t show you the worst possible outcome.
Check whether contributions stay fixed in pounds or rise with inflation. That matters when the illustration runs for many years.
Separate a pension pot from retirement income
An illustrated pension pot and an illustrated yearly income aren’t the same thing. Check how the calculator turns one into the other. Does it assume withdrawals until a chosen age, a particular investment return during retirement, or that you buy an annuity (an income bought with your pension money)?
If a model spreads your money out to a fixed age, that doesn’t guarantee it will last your lifetime. The outcome can change depending on:
actual returns
when those returns happen
withdrawals
how long you live
A calculator’s income figure isn’t automatically an annuity quote, or a recommendation for a sustainable level of withdrawals.
Check State Pension and tax assumptions
Don’t assume a default State Pension figure is what you’re entitled to. Check your own forecast and State Pension age using the official services. GOV.UK: State Pension forecast, State Pension age.
Check whether the income result includes tax, whether it uses the right UK tax rules for you, and how it treats any tax-free cash from your pension. Today’s tax rules can’t tell you exactly what the rules will be when you retire. HMRC: tax on your private pension.
A calculator may show a tax-relief top-up without checking all the conditions that apply to you. The relief, or any charges, can be affected by:
relevant earnings
age
other pension contributions
pension allowances
Check the actual rules separately. HMRC: pension tax relief, annual allowance.
Compare like with like
If an illustration compares income with a household spending benchmark, check whether it’s for one person or two, which housing costs are included, and whether both figures are before or after tax. A spending benchmark for two people doesn’t mean the calculation has included another person’s pension.
The Retirement Living Standards give examples of household spending. They aren’t personal targets or guaranteed pension incomes. They don’t include rent or mortgage payments. Pensions UK: Retirement Living Standards.
Use the illustration to see what changing an assumption does, and to spot questions worth checking. It can’t decide what’s affordable or suitable for your circumstances.
