NI Pension Check
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METHODOLOGY · 2026/27

How the calculator works

The tool is designed for screening and comparison. It deliberately asks for your official forecast because individual entitlement can be affected by transitional and contracted-out history.

Rates used

The calculator uses the 2026/27 full new State Pension rate of £241.30 per week and a simplified one-thirty-fifth annual accrual. The default full-year Class 3 cost is £956.80, based on £18.40 for 52 weeks.

Useful years

Enter the weekly estimate earned from your NI record to date, excluding forecast future contributions. The baseline is that amount plus expected future years multiplied by £241.30/35, capped at £241.30 (or preserving an existing higher protected amount). Top-up years are limited by the gaps entered and the remaining headroom. The final year can add less than £241.30/35, while its entered purchase cost is still charged in full. There is no hard 35-year cap: pre-2016 records can need more years. If existing plus future years total fewer than 10, this simplified model withholds an estimate: minimum-qualification and overseas exceptions require individual assessment.

Tax and break-even

Annual uplift is the capped weekly increase from purchased years only, multiplied by 52, then reduced by the selected tax percentage. Cost is modelled top-up years multiplied by the entered per-year price. Break-even is cost divided by annual net uplift, measured from pension receipt, not payment today. With no uplift, no break-even is shown. Lifetime value is net uplift times years receiving pension, minus cost. This ignores inflation, investment returns, benefit interactions and future tax changes. Different gap prices must be checked separately.

Known limitations

The calculation cannot reproduce DWP's individual transitional calculation, confirm that a particular gap is payable, identify NI credits, account for future uprating or predict tax rules. Always verify each year before paying.

Official sources and scope

For UK new State Pension planning, not US Social Security. Check your individual record before paying.

Code and arithmetic checks are not independent professional certification.

Reproduce the partial-headroom example

With an earned-to-date estimate of £238.30, no future years, one gap, a price of £956.80 and 0% tax, the model adds £3 a week: £156 a year. Cost divided by that uplift is about 6.13 years. At 20% tax, the £124.80 annual uplift gives about 7.67 years. This assumes the official record supports that increase; it is not a determination of entitlement.

One price field has a limited scope

Different gaps can have different prices and effects. The model applies the entered price to each useful modelled purchased year. It does not choose the best real tax years, calculate NI credits or reconcile an HMRC account. Keep a separate per-year worksheet and obtain confirmation before paying.

Employer-cost model

The separate employer calculator documents its annualised standard-category assumptions, official sources and examples. It does not change the State Pension gap model.