CalcBritain

State Pension Top-Up Calculator

Should you buy back missing National Insurance years? See the cost, the extra pension you'd get for life, and how quickly it pays for itself — an MSE flagship calculation that can be worth thousands.

Estimate only. This is an estimate for information only, not financial or pensions advice. Always check your own NI record and forecast before buying back any years.

Total cost to buy back
£956.80
Extra State Pension per year, for life: £358.50
Break-even point
2.7 yrs

You need to draw your State Pension for about 2.7 years before this pays for itself — after that, it's pure gain, for life.

Effective annual return
37.5%

Extra pension per year bought is worth about 37.5% of the cost per year, every year, for life — guaranteed and inflation-linked. Very few other places to put your money can match that.

Estimated lifetime gain
£6,213.20

Over 20 years of drawing your pension, buying back this year could net you about £6,213.20 above what you paid.

Your full horizon (until SPA + drawing years): 30 years

Before you buy
  • Check your NI record and State Pension forecast first at gov.uk/check-state-pension — some gap years fill automatically for free via NI credits (e.g. Child Benefit, Universal Credit, some benefits), so you might not need to pay at all.
  • The old 2006-2018 buy-back window closed in April 2025 — you can now only usually go back the standard 6 tax years, so don't sit on this decision too long.
  • If you're on means-tested benefits (Pension Credit, Universal Credit), check how a higher State Pension might affect your entitlement before you pay.
  • If you were self-employed in a missing year, you may be able to pay the much cheaper Class 2 rate instead of Class 3 — check your eligibility before paying.

How buying back a National Insurance year works

You normally need 35 qualifying National Insurance years for the full new State Pension. If your record has gaps — time abroad, unemployment, low earnings, or years before some benefits automatically counted — you can usually pay a flat voluntary contribution to fill them. Each year added is worth roughly 1/35 of the full new State Pension for the rest of your life, index-linked under the pensions triple lock. Because the payback period is typically only around two and a half years of retirement, and the State Pension is paid for as long as you live, this is one of the highest-value purchases most people over 40 can make — but always check your own NI record and forecast first, since some years may already be free to fill.