The 4% rule offers a useful starting point, but your retirement date also depends on spending, tax and the years before your State Pension arrives.
There comes a point when another Monday morning makes you wonder whether you could simply stop. Not take a longer holiday. Stop.
Your pension balance cannot answer that question on its own. What matters is how much you need each year, when your guaranteed income starts and whether your savings can cover the gap without running dry.
Start with spending, not the number on your pension statement. Make a retirement budget covering housing, bills, food, transport, insurance and the pleasures that make retirement worth having. Add irregular costs: a replacement car, home repairs and helping family do not arrive in tidy monthly instalments.
Then remove costs that really will disappear, such as commuting or pension contributions. Do not remove the mortgage because you hope it will be gone. Check the repayment date. If you share household costs, work out what happens if one income ends before the other.
Separate spending you must cover from spending you could reduce after a bad year. This distinction matters more than an impressive-looking spreadsheet. MoneyHelper’s pension calculator can estimate income from defined contribution pensions, defined benefit pensions and the State Pension; changing the retirement age lets you see what another year of work might do.
Next, list income by its start date. A defined benefit pension is normally an income promise, not a pot to which you can apply a withdrawal percentage. Ask the scheme what it would pay at each proposed retirement age: taking it early will normally mean less. For the State Pension, use your own GOV.UK forecast rather than assuming you will receive the full amount.
The full new State Pension is £241.30 a week in the 2026/27 tax year, or £12,547.60 over 52 weeks. Your entitlement may differ, including because of your National Insurance record. State Pension age is rising from 66 to 67 between April 2026 and April 2028, so check your precise date.
Once you know the annual gap between your planned spending and dependable income, you can make a rough estimate of the invested pot needed to fill it. Divide the gap by 0.04. The shorthand is to multiply it by 25.
Suppose you want £32,000 a year before tax and expect £12,000 a year from guaranteed pensions once they are in payment. The gap is £20,000. At an initial withdrawal rate of 4%, that points to an invested pot of £500,000. If you test a 3% starting rate instead, the figure is about £667,000. Neither figure is a promise or a recommended target.
The date you can stop working is set by the income gap your savings must cover, not by the size of your pension pot alone.
The rule came from research into historical US stock and bond returns over retirement periods of around 30 years. It means taking 4% of the pot’s value in the first year, then increasing that cash amount with inflation in later years. It does not mean taking 4% of whatever remains each year.
US history cannot guarantee a UK result. Charges, tax, investment returns, inflation and a retirement lasting longer than 30 years all matter. A market fall soon after you stop working is particularly awkward: withdrawals then sell more of a diminished pot. Treat 4% as a way to ask better questions, not as HMRC’s permission slip to resign.
Make a separate plan for the years before each income source starts. Using our example, someone stopping at 60 with no guaranteed income until 67 would need to cover seven years of £32,000 spending. That is £224,000 of spending at today’s prices, before tax, inflation or investment returns. It is not a final calculation of how much extra capital they need: money left invested may rise or fall during those seven years.
At 67, the income gap might shrink. But the £500,000 suggested by the 4% illustration would need to be there then, after paying for the earlier years. Applying 4% to the balance at 60 and ignoring seven years of larger withdrawals is how a plausible plan becomes a nasty surprise.
Check which money you can actually reach. Most people can access a private pension from age 55 in 2026/27; the normal minimum pension age rises to 57 on 6 April 2028, subject to exceptions such as protected pension ages. An ISA can generally be accessed at any time, subject to its terms, which may make it useful for a gap before pension access.
The overall ISA subscription limit is £20,000 in 2026/27. From 6 April 2027, the annual amount someone under 65 can put into cash ISAs falls to £12,000, within the unchanged £20,000 overall limit. That changes how you might build a future bridge; it does not make an existing ISA balance inaccessible.
Yes, because spending money and withdrawing it are not the same calculation. A £20,000 annual spending gap does not necessarily mean a £20,000 gross pension withdrawal will do the job. State Pension and most private pension income are taxable, although you can usually take up to 25% of a defined contribution pension tax-free, subject to the applicable lump-sum limits. ISA withdrawals are generally tax-free.
For 2026/27, the standard Personal Allowance is £12,570. Pension income above it can fall into different tax bands depending on your total income and where you live. Scotland has different rates and bands for pension income; England, Wales and Northern Ireland share the main rates for 2026/27. So calculate the gross income required to meet your after-tax budget rather than quietly treating the two as identical.
There is another trap if you might work again. Taking taxable money flexibly from a defined contribution pension will usually trigger the money purchase annual allowance. In 2026/27 it limits tax-relieved defined contribution pension saving to £10,000 a year, including employer contributions. Taking only tax-free cash usually does not trigger it. Worth checking before you turn a trial retirement into a part-time job.
Finally, stress-test the plan: lower investment returns, higher spending, a longer life or a delayed house sale. Review it each year rather than declaring victory once. MoneyHelper and a free Pension Wise appointment can help you understand pension options; for a decision involving several pensions, substantial withdrawals or a defined benefit transfer, consider an FCA-regulated financial adviser.
You can afford to retire when dependable income and an accessible, resilient savings plan can cover your spending at every stage, including the years before State Pension. The 4% rule gives a rough first estimate: multiply the annual gap you expect your investments to fill by 25. Then check tax, access ages and what happens if markets or your plans refuse to follow the spreadsheet.
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