Lifetime Pension Calculator UK

The Lifetime Pension Calculator estimates how a defined contribution pension could grow between now and retirement. It can help you explore how your current pension savings, future contributions, investment performance, charges and time horizon may affect the eventual value of your pension pot.

The result is a projection rather than a guaranteed pension valuation. Investment returns can vary, charges differ between schemes and future pension or tax rules may change. The calculator should therefore be used to compare reasonable scenarios rather than predict an exact retirement outcome.

How does the Lifetime Pension Calculator work?

The calculator applies compound growth to your existing pension and future contributions over the period to retirement. Its estimate depends directly on the contribution, return, charge and retirement assumptions entered.

Start with the value of your current defined contribution pension savings and the length of time remaining until your chosen retirement age. Add the regular gross pension contributions that you expect to be paid into the scheme, including employer contributions where relevant.

The calculation then applies the assumed investment return and pension charges over the projection period. Growth is compounded, meaning that later returns may be earned on both the money contributed and earlier investment growth.

The figures normally needed for a useful projection include:

Current pension value: the combined value of the defined contribution pensions included in the calculation.
Future contributions: the gross amount expected to enter the pension, including tax relief or employer payments where applicable.
Time to retirement: the period over which contributions and investment growth are modelled.
Investment return: an assumed annual rate before or after charges, according to how the calculator labels the field.
Pension charges: administration, platform, fund and adviser charges included in the projection.
Inflation: an assumption used to express a future pension value in today’s spending terms, where this result is provided.

A defined benefit pension does not build a personal investment pot in the same way. Its benefits are generally calculated using scheme rules, pensionable earnings and service, so a defined contribution projection may not provide a suitable estimate for that type of arrangement.

What do the pension projection results mean?

The projected pension pot is the estimated value at retirement under the assumptions entered. It is not the same as guaranteed retirement income or the amount that would be available after tax.

The projected value may be separated into the pension you already hold, future contributions and estimated investment growth. This breakdown can show whether the result depends mainly on continued saving or on an assumed rate of return.

If the calculator displays a value in today’s money, it has adjusted the future amount for assumed inflation. This can give a more meaningful indication of purchasing power than a nominal future balance, although the actual rate of inflation will not be known in advance.

A projected pension pot does not automatically translate into a fixed annual income. The eventual income will depend on how and when benefits are taken, future investment performance, charges, life expectancy, annuity rates and the amount withdrawn. State Pension and defined benefit income should be considered separately unless the calculator specifically includes them.

Illustrative lifetime pension calculation

This illustrative example shows how long-term contributions and compound growth could build a pension pot. It uses simplified assumptions and does not represent a guaranteed return or a recommendation.

Illustrative assumptions: a person aged 35 plans to retire at 67, already has £25,000 in a defined contribution pension and expects gross contributions of £6,000 at the end of each year. Investments are assumed to return 5% a year before annual charges of 0.75%, giving a simplified net growth assumption of 4.25%.

Example input	Illustrative assumption
Current pension pot	£25,000
Projection period	32 years
Gross annual contributions	£6,000
Assumed return before charges	5.00% a year
Assumed annual charges	0.75%
Simplified net growth rate	4.25% a year

Using annual compounding and year-end contributions, these assumptions produce an estimated pension pot of approximately £490,000 at age 67. Around £217,000 consists of the initial pot and subsequent contributions, while the remainder is estimated investment growth.

If inflation averaged 2.5% throughout the same period, £490,000 in 32 years would have purchasing power broadly equivalent to about £222,000 today. Both figures are sensitive to the assumptions: lower returns, higher charges, missed contributions or earlier retirement would reduce the projection.

How are pensions taxed over a lifetime?

Registered pensions can receive tax relief on qualifying contributions and generally grow without UK Income Tax or Capital Gains Tax inside the pension. Tax may become payable when benefits are withdrawn.

For 2026/27, the standard pension annual allowance is £60,000, although the tapered annual allowance and money purchase annual allowance can reduce this amount. Personal tax relief is also generally limited by relevant UK earnings, subject to the separate relief available on gross contributions of up to £3,600 for eligible people with low or no earnings. HMRC publishes the current pension scheme rates and allowances.

You can usually take up to 25% of qualifying pension benefits tax free, subject to your remaining lump sum allowance. The standard lump sum allowance is £268,275 for 2026/27, although protection or previous pension withdrawals can alter the amount available. GOV.UK explains the lump sum allowance rules.

The former pension lifetime allowance was abolished from 6 April 2024. A large projected pension pot is therefore not currently tested against the former £1,073,100 lifetime allowance, but the lump sum allowance and lump sum and death benefit allowance continue to limit certain tax-free payments.

Most taxable pension withdrawals are added to other taxable income and charged at the applicable Income Tax rates. Taking a large withdrawal in one tax year may therefore create a different tax outcome from spreading withdrawals across several years.

What can change a lifetime pension estimate?

Investment returns, inflation, charges, contribution changes and the selected retirement date can materially alter the result. Comparing several cautious assumptions is usually more informative than relying on one projection.

Investment performance: pension investments can rise or fall, and returns may be uneven rather than arriving at a constant annual rate.
Charges: apparently small annual fees can have a significant cumulative effect over several decades.
Contribution increases: future pay rises, employer matching or additional contributions can raise the projected pot.
Contribution gaps: career breaks, unemployment or reduced working hours may lower the amount contributed.
Inflation: higher inflation reduces the spending power of a future pension balance.
Retirement timing: retiring later normally provides more time for contributions and growth, while retiring earlier generally does the opposite.
Withdrawal choices: drawdown, an annuity and cash withdrawals involve different risks, costs and tax consequences.
Future rules: tax relief, allowances, pension access rules and State Pension legislation may change before retirement.

Most people can currently access private pension benefits from age 55, subject to scheme rules and limited exceptions. The normal minimum pension age is enacted to rise to 57 from 6 April 2028, although protected pension ages and ill-health rules may apply in some cases.

Common mistakes when projecting a pension

Common errors include using an unrealistic growth rate, omitting charges and treating a future nominal balance as if it had today’s purchasing power. Contributions should also be entered consistently as gross or net amounts.

Entering only personal payments when employer contributions and tax relief should also be included in the gross contribution.
Counting basic-rate relief twice where the pension value already includes relief at source.
Using an investment return without checking whether charges are deducted separately.
Assuming contributions will remain uninterrupted throughout the projection.
Including a defined benefit pension as though it were an invested pension pot.
Treating estimated investment growth as guaranteed.
Assuming the full projected pot can be withdrawn tax free.
Ignoring existing use of the lump sum allowance or a protected allowance.

Related pension and investment calculations

A lifetime pension projection is most useful when combined with separate checks for contribution limits, tax relief and the effect of compound growth. Each calculation answers a different retirement-planning question.

Use the Pension Annual Allowance Calculator to consider annual allowance, tapering and available carry forward. For a general comparison of long-term deposits and growth assumptions, the Compound Interest Calculator can model an initial balance and regular additions.

This calculator provides estimates only. Actual pension values, investment returns, charges, tax treatment, personal circumstances and available reliefs differ, and pension or tax rules may change; consider regulated financial advice or appropriate professional tax advice where necessary.