Pension Drawdown Calculator UK

The Pension Drawdown Calculator estimates how a defined contribution pension fund could change while you take retirement income from it. It can help you explore whether a chosen withdrawal level may be sustainable under different investment growth, charge and retirement-period assumptions.

Drawdown keeps some or all of your pension invested while allowing you to make withdrawals. This creates flexibility, but neither the remaining fund nor the income is guaranteed. Investment performance, inflation, charges, tax and the timing of withdrawals can all materially affect the outcome.

How does the Pension Drawdown Calculator work?

The calculator projects your pension balance after applying assumed investment growth and deducting the withdrawals entered. It shows a scenario rather than predicting how investments will actually perform.

Enter the pension fund and withdrawal information requested by the calculator. Depending on the fields shown, the projection may use your starting pension pot, regular withdrawal amount, expected investment return, charges and the number of years over which drawdown is modelled.

The calculation generally follows this sequence:

Start with the pension fund allocated to drawdown.
Apply the assumed investment growth for the relevant period.
Deduct charges where these are entered separately.
Subtract the planned pension withdrawal.
Repeat the calculation for each remaining year of the projection.

Whether withdrawals are treated as occurring at the beginning or end of each period can affect the result. Money withdrawn earlier has less time to benefit from potential investment growth, so compare the calculator’s estimate with the methodology or assumptions displayed alongside its results.

What do the pension drawdown results mean?

The results indicate how the modelled pension fund may change and whether it lasts for the selected period. They do not guarantee that the same income can be maintained in practice.

The projected remaining balance is the estimated amount left after the modelled withdrawals, growth and charges. A positive final balance means that money remains at the end of the selected period under those assumptions. It does not necessarily mean that the withdrawal plan is sustainable for the rest of your life.

If the projection reaches zero, the assumed withdrawals have exhausted the modelled pension fund. The actual exhaustion date could be earlier or later because investment returns are unlikely to arrive at a constant rate each year.

Any total withdrawal figure is normally shown before Income Tax unless the result expressly provides a tax calculation. Your spendable income may therefore be lower than the gross amount withdrawn.

Illustrative pension drawdown example

This illustrative example shows how a pension pot might change under fixed withdrawal and growth assumptions. It is simplified, does not predict investment returns and is not a recommended withdrawal strategy.

Illustrative assumptions: a person moves £300,000 into flexi-access drawdown and withdraws £15,000 at the end of each year for 20 years. The remaining fund is assumed to achieve net annual growth of 4% after charges. Withdrawals remain fixed and do not increase with inflation.

Example input	Illustrative assumption
Starting drawdown fund	£300,000
Annual withdrawal	£15,000
Net annual growth	4%
Projection period	20 years
Withdrawal timing	End of each year
Withdrawal increases	None

Under these assumptions, total gross withdrawals would be £300,000 over 20 years and approximately £211,000 could remain at the end of the period. The fund does not simply fall by £15,000 each year because the invested balance is assumed to continue growing.

This outcome depends heavily on the 4% net return arriving consistently. Lower returns, higher charges or withdrawals at the start of each year would reduce the ending balance. Increasing the £15,000 withdrawal with inflation would also use the fund more quickly.

How is pension drawdown taxed?

Eligible tax-free cash may be available when benefits are placed into drawdown, while subsequent drawdown income is normally taxable as pension income. The precise outcome depends on your other income and remaining allowances.

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

A common approach is to take eligible tax-free cash and designate the remaining amount to flexi-access drawdown. Payments taken from that drawdown fund are generally taxed as pension income at the individual’s marginal rate. The pension provider normally deducts tax through PAYE.

A first or irregular flexible pension payment may initially be taxed using an emergency tax code. This can result in too much or too little tax being deducted at the time of payment, with HMRC later adjusting the position or accepting a repayment claim where appropriate.

Large withdrawals can move part of your total income into a higher tax band. A drawdown calculator that projects the pension balance should not be treated as a complete Income Tax calculation unless it specifically includes all relevant taxable income and the applicable tax jurisdiction.

Does pension drawdown trigger the money purchase annual allowance?

Taking taxable income flexibly will normally trigger the money purchase annual allowance, restricting future tax-relieved defined contribution pension saving. Merely placing funds into drawdown without taking taxable income does not usually trigger it.

The money purchase annual allowance is £10,000 for 2026/27. Once triggered, it generally applies in the tax year of flexible access and future tax years, and unused money purchase annual allowance cannot normally be carried forward.

Taking only a pension commencement lump sum and leaving the taxable drawdown fund untouched will not usually trigger the allowance. Taking taxable income from flexi-access drawdown normally will. Different rules can apply to small-pot payments, capped drawdown and other types of pension benefit, so confirm the position with the pension provider before withdrawing if future contributions are planned.

HMRC publishes the current pension scheme rates and allowances, including the money purchase annual allowance.

What affects how long a drawdown pension lasts?

The withdrawal rate is only one part of drawdown sustainability. Investment returns, their timing, inflation, charges, longevity and unexpected spending can all change how long the fund lasts.

Withdrawal amount: larger or more frequent payments reduce the invested balance more quickly.
Investment returns: weaker returns reduce the fund, while stronger returns may help it last longer.
Sequence of returns: significant losses early in retirement can be especially damaging when withdrawals continue during the downturn.
Inflation: increasing withdrawals to maintain spending power can materially shorten the life of the fund.
Charges: platform, fund, transaction and adviser charges reduce the return retained in the pension.
Retirement length: the pension may need to support income for longer than expected.
Other income: State Pension, defined benefit pensions, employment income and savings may reduce the amount needed from drawdown.
Tax: gross pension withdrawals may need to be higher than the desired net income after Income Tax.

Testing several scenarios can make the result more useful. For example, compare lower and higher growth assumptions, fixed and inflation-linked withdrawals, and longer retirement periods. A plan that works only under an optimistic return may leave little margin for poor investment performance.

Common pension drawdown mistakes

Common mistakes include treating average returns as guaranteed, overlooking tax and charges, and assuming that a pension lasting for the selected period will last for life. Drawdown plans should be reviewed as circumstances and markets change.

Entering a growth rate without deducting charges when the calculator expects a net return.
Comparing a gross withdrawal with a household budget based on net spending.
Ignoring inflation when modelling withdrawals over a long retirement.
Assuming investment returns will occur smoothly every year.
Using the former pension lifetime allowance, which was abolished from 6 April 2024.
Taking taxable income without considering whether it will trigger the money purchase annual allowance.
Assuming that all pension providers offer the same investments, fees and withdrawal options.
Failing to allow for emergencies, care costs or a longer-than-expected lifetime.

Important limitations of the drawdown estimate

The calculator cannot predict investment markets, lifespan, inflation, future tax law or spending needs. Its result should be treated as a planning illustration based on the information entered.

A steady assumed return does not reproduce real market movements. Two portfolios with the same long-term average return can produce very different drawdown outcomes if losses occur at different stages of retirement.

The calculator may also exclude adviser fees, product-specific charges, tax on withdrawals, State Pension, defined benefit income, inheritance objectives and future contribution changes unless these are expressly included in its inputs or results.

Drawdown does not provide the guaranteed lifetime income associated with a lifetime annuity. Regular reviews may be needed to compare actual performance, remaining assets and changing income requirements with the original assumptions.

Related pension calculations

Drawdown planning can be combined with separate calculations for pension growth, contribution allowances and Income Tax. These tools address different parts of the retirement decision.

Use the Compound Interest Calculator to explore general long-term investment growth before withdrawals begin. The Pension Annual Allowance Calculator can help assess contributions, carry forward and annual allowance limits.

If you need to estimate tax on pension income alongside other taxable income, the Income Tax Calculator can provide additional context, although provider PAYE deductions and emergency tax may differ from a full-year estimate.

This calculator provides estimates only. Actual investment returns, charges, withdrawal tax, personal circumstances and available reliefs differ, and pension or tax rules may change; regulated financial advice or appropriate professional tax advice may be suitable before making or changing pension withdrawals.