Voluntary NI Top-Up Calculator

Missing National Insurance years? See exactly what buying them costs, what they add to your State Pension, and how fast the top-up pays for itself.

Lifetime Gain After Tax
£0
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Total Cost of Top-Up
£0
Extra Pension per Year (Gross)
£0
Extra per Year After Tax
£0
Payback Period
0 yrs
Break-Even Age
·
Return on Cost
0%
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Cumulative Position After State Pension Age
Before You Pay · The 3 Checks
1. Check your forecast. If you will reach 35 qualifying years anyway before State Pension age, buying years adds nothing · see our State Pension Forecast tool and your GOV.UK record.
2. Call the Future Pension Centre (0800 731 0175). They confirm which specific years actually increase your pension · some pre-2016 years with contracted-out periods do not.
3. Check Class 2 eligibility. If you were self-employed in the gap years, Class 2 at ~£182 buys the same benefit as Class 3 at ~£923.

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Voluntary NI FAQs

How much does it cost to buy a missing NI year?
A full Class 3 voluntary year costs around £923 (£17.75 per week). If you were self-employed in the gap year you may qualify for Class 2 instead at roughly £182 (£3.50 per week), which buys exactly the same State Pension benefit at a fraction of the price. Partial years · where you already have some contributions · cost proportionally less, which can make them spectacular value.
How much extra State Pension does one NI year buy?
Each qualifying year adds 1/35th of the full new State Pension. At a full rate of around £241 a week, that is about £6.89 a week or roughly £358 a year · for life, and increased every year by the triple lock. A £923 Class 3 year therefore pays for itself in well under 3 years of retirement before tax.
When is buying NI years NOT worth it?
If you will reach 35 qualifying years anyway before State Pension age through continued work, or credits (child benefit, carer's credit, Universal Credit), buying extra years adds nothing. It is also poor value if you are in seriously bad health, since payback needs roughly 3 years of drawing the pension. Always check your forecast and ring the Future Pension Centre before paying · some historic years do not increase your pension because of contracted-out deductions.
How far back can I fill NI gaps?
You can normally fill gaps from the last 6 tax years. The special extended window to fill gaps back to 2006 closed on 5 April 2025. Each April the oldest year drops out of reach permanently, so if you have gaps and buying makes sense, sooner beats later.
Is the extra State Pension taxable?
Yes · the State Pension is taxable income. If your total retirement income exceeds the £12,570 Personal Allowance, the extra pension is taxed at your marginal rate, so a basic-rate taxpayer keeps 80% of it. Even after tax, the payback on Class 3 is typically 3 to 4 years, a return no commercial annuity comes close to matching.

For informational purposes only · Not financial advice · Figures assume the 2026/27 full new State Pension and Class 2/3 rates; the exact cost of each gap year is shown on your GOV.UK NI record · Always verify with the Future Pension Centre before paying · Triple lock uprating not included in the projection (real gains are typically higher)