State Pension Deferral Calculator: Is Waiting Worth It?

If you reach state pension age on or after 6 April 2016, you can put off claiming the new state pension and it grows by 1% for every 9 weeks you wait, which works out at just under 5.8% for a full year. The catch is that you give up every payment in the meantime, and the extra comes back slowly. Without any tax or inflation differences, it takes 900 weeks of claiming, about 17 years and four months, to win back what you gave up, however long you defer. Enter your forecast, how long you would wait and your tax rates to see your extra weekly income and the age you would break even. The full new state pension is £241.30 a week in 2026/27.

How the deferral increase works

For the new state pension, each week you put off claiming adds one ninth of 1% to your weekly amount. Defer 9 weeks and you get 1% more; defer 52 weeks and you get about 5.78% more; defer two years and it is about 11.56%. The increase is worked out on the weekly amount at the point you start claiming, and you get it for life. There is no lump-sum option on the new state pension: the only reward is the higher weekly payment.

That fixed rate is why the break-even point barely moves with the length of deferral. Wait twice as long and you give up twice as much, but you also earn twice the extra, so the payback is about 900 weeks either way. What changes the answer is tax and inflation, which is what the calculator adjusts for.

When deferring tends to make sense

• You are still working and paying higher-rate tax. Claiming now could see the pension taxed at 40%; if the extra will be taxed at 20% or 0% later, you keep more of it and break even sooner.
• You expect a long retirement and want more guaranteed, inflation-linked income in your 80s and 90s.
• You do not need the money yet and have other savings or earnings to live on.

It tends to work against you if your health or family history suggests a shorter retirement, if you would otherwise spend savings to cover the gap, or if you get certain benefits. You do not build up any extra while you receive benefits such as Pension Credit, Carer's Allowance or Universal Credit, or while your partner receives means-tested benefits such as Pension Credit or Universal Credit, so check the GOV.UK deferral rules before you decide.

Things the calculator does not cover

• People who reached state pension age before 6 April 2016 are on the old basic state pension, which had a higher rate (1% for every 5 weeks) and a lump-sum option. This tool uses the new state pension rules.
• It ignores what the forgone payments could have earned if invested, and it does not model inheritance by a spouse or civil partner.
• Tax rates are applied as flat rates to the pension and the extra. If the extra pushes part of your income into a higher band, the real result will be a little worse.

For the wider picture, see our guide to how the state pension works and the how much do I need to retire calculator.