Gaps in Your National Insurance Record 2026/27: How to Check and Fill Them
How to check your National Insurance record for gaps and fill them with voluntary Class 3 contributions at £18.40 a week in 2026/27, with a worked example of the State Pension impact.
Why gaps happen — and why they matter
A "qualifying year" for the State Pension generally means a tax year in which you paid, or were credited with, enough National Insurance. Gaps commonly arise from periods of low earnings, self-employment with profits below the small profits threshold, time spent abroad, or gaps in employment. Because the new State Pension requires 35 qualifying years for the full amount, and a minimum of 10 for any payment at all, gaps can directly reduce your eventual State Pension income.
State Pension Forecast Calculator
Forecast your UK State Pension based on qualifying NI years and model the impact of filling gap years with voluntary Class 3.
Open State Pension Forecast calculatorChecking your record
Your personal tax account on GOV.UK shows your full National Insurance record year by year, flags any gaps, and — crucially — tells you exactly how much it would cost to fill each specific gap voluntarily, since historic rates can differ from the current year's rate.
The cost of filling a gap: Class 3 voluntary contributions
For most people, filling a gap year means paying voluntary Class 3 contributions, priced at £18.40 a week in 2026/27.
Worked example — filling one full gap year:
- Weekly rate: £18.40
- Weeks in a year: 52
- Cost to fill one gap year: £18.40 × 52 = £956.80
Why it's often worth it
Each additional qualifying year typically adds a set weekly amount to your eventual State Pension, paid for the rest of your life once you reach State Pension age. Because the new State Pension (£241.30 a week in 2026/27 at the full rate) is built from 35 years, one extra year is roughly worth 1/35th of the full weekly rate — in the region of £6-£7 a week, or over £300-£350 a year, for life.
How far back you can go
Ordinarily, you can only pay voluntary contributions to fill gaps from the previous 6 tax years. However, the government has periodically extended this window — allowing eligible people to fill gaps stretching back to April 2006 during a temporary extension. Because these extended windows have historically been time-limited, it is worth checking the current deadline directly on GOV.UK before assuming an older gap can still be filled.
Credits: filling gaps for free
Not every gap needs to be paid for. National Insurance credits are awarded automatically, or on application, in a range of circumstances — including receiving Child Benefit for a child under 12 (Class 3 credits), claiming Jobseeker's Allowance or Universal Credit while looking for work, being a registered carer, or receiving certain disability and incapacity benefits. If a gap year turns out to be eligible for a credit you haven't claimed — Specified Adult Childcare credits transferred from a grandparent to a working parent is a common example — it can be filled without paying anything at all.
uk-national-insurance-contributions-guideBottom line
Checking your National Insurance record for gaps takes a few minutes online and can reveal a genuinely high-value opportunity: at roughly £18.40 a week, filling a gap year is one of the better-value ways to boost guaranteed, inflation-linked retirement income for life. Before paying anything, always check whether a gap could instead be filled by an unclaimed credit first.
Sources
- GOV.UK: Check your National Insurance record
- GOV.UK: Voluntary National Insurance contributions
- GOV.UK: The new State Pension
Frequently asked questions
How many qualifying years of National Insurance do I need for the full State Pension?
You generally need 35 qualifying years of National Insurance contributions or credits to receive the full new State Pension, and a minimum of 10 qualifying years to receive any new State Pension at all.
How much does it cost to fill a gap year with voluntary contributions?
Voluntary Class 3 National Insurance contributions cost £18.40 a week in 2026/27, meaning a full gap year costs roughly £956.80 (52 weeks × £18.40), though the exact rate that applies can depend on which tax year the gap relates to.
Is it worth paying to fill a gap year?
For most people below State Pension age with a genuine gap, yes — one extra qualifying year typically adds a fixed weekly amount to the State Pension for life, meaning the cost is often recovered within a few years of receiving the pension, making it one of the better-value purchases available for retirement income, though individual circumstances vary.
How far back can I fill gaps in my National Insurance record?
Normally you can only fill gaps from the last 6 tax years, but a temporary extension has allowed some people to fill gaps back to April 2006 — it is worth checking the current deadline on GOV.UK, as these extended windows have previously been time-limited and subject to change.
What counts as a National Insurance credit, separate from a paid contribution?
Credits are awarded automatically or on claim in various circumstances — including receiving Child Benefit for a child under 12, claiming Jobseeker's Allowance or Universal Credit, being a carer, or receiving certain other benefits — and count towards qualifying years in the same way as paid contributions, without any cost to you.
Where do I check my own National Insurance record for gaps?
You can check your National Insurance record and State Pension forecast online through your personal tax account on GOV.UK, which shows exactly which years are full, which are gaps, and how much any gap would cost to fill voluntarily.
Try the calculators
Related reading
Specified Adult Childcare Credits 2026/27: How Grandparents Can Boost Their State Pension
Specified Adult Childcare credits let a working-age grandparent providing childcare claim the National Insurance credit that would otherwise go unused by the parent claiming Child Benefit, boosting their State Pension.
How to Fill National Insurance Gaps in 2026 — And Whether It's Worth It
Gaps in your National Insurance record reduce your State Pension. You can fill gaps going back 6 years with Class 3 voluntary NI at £18.40 per week. But not every gap is worth filling — here's how to work out if it pays.
Grandparent Childcare National Insurance Credits 2026/27: The Specified Adult Childcare Credit Explained
Grandparents who look after grandchildren while the parents work can claim National Insurance credits worth a full qualifying year towards State Pension — a widely underclaimed entitlement. Full guide to eligibility, backdating and how to apply.