National Insurance

National Insurance contributions (NICs) fund the contributory benefit system, including the State Pension (requiring 35 qualifying years for the full new State Pension of £241.30/week in 2026/27), Statutory Sick Pay, and Maternity Allowance. Class 1 NICs are paid by employees on earnings above the Primary Threshold, and by employers on earnings above the Secondary Threshold. Class 2 and Class 4 NICs apply to the self-employed. Gaps in a NI record can usually be filled for up to 6 years by paying voluntary Class 3 NICs, which cost £18.40 a week in 2026/27. Check your NI record and State Pension forecast via the Government Gateway. NICs are administered by HMRC separately from Income Tax.

What it means in practice. What matters for your State Pension is not how much you paid but how many qualifying years you built. A year counts if your earnings crossed the relevant threshold, so someone earning modestly all year can bank a full qualifying year while someone with one very large month may not. Certain years are credited without payment: National Insurance credits are awarded while you claim Child Benefit for a child under 12, while you receive Universal Credit or Carer's Allowance, and in various other caring and jobseeking situations.

A worked example. Helen took twelve years out of paid work to raise her children. She checks her record on the Government Gateway and finds she has 26 qualifying years — well short of the 35 needed for the full new State Pension of £241.30 a week. Two of the gap years fall while she was caring for her children, and she discovers she never claimed Child Benefit because her partner earned too much, so no credits were awarded. She applies for the credits retrospectively, and for two remaining gaps she buys voluntary Class 3 contributions, each of which adds to her eventual weekly pension.

Common pitfalls. The most costly is not checking the record until you are close to retirement, because voluntary contributions can normally only be bought for the last six years. Opting out of Child Benefit entirely to avoid the High Income Child Benefit Charge is another — you should register and elect not to receive payment, which preserves the credits. Self-employed people with low profits sometimes fall below the threshold and unknowingly lose a qualifying year, which voluntary Class 2 contributions can protect cheaply.

How it relates to other terms. NICs are collected through PAYE for employees and through self assessment for the self-employed. Contributions underpin contributory benefits including the State Pension, Bereavement Support Payment, and New Style Employment and Support Allowance, though Statutory Sick Pay is now a day-one right that no longer depends on an earnings test. Pension Credit is the means-tested top-up for pensioners whose contribution record leaves them short.

What to do next. Check your record and forecast first, then read our State Pension guide to see how many years you still need. Employers should follow PAYE basics, and the self-employed should read self assessment basics to make sure low-profit years still count.