Last updated: October 2026 · General information only, not pension or financial advice. Figures are for 2026/27.
Gaps in your National Insurance record sound boring, but they can quietly cost you thousands of pounds in State Pension over your retirement. The good news is that checking takes about 10 minutes, some gaps can be filled for free, and paying for a gap can be worthwhile if HMRC confirms it will increase your pension. It does not help everyone.
In this guide I’ll walk you through how National Insurance affects your State Pension, how to check your record, which gaps you can fill for free, what voluntary contributions cost in 2026/27, and how to decide whether paying is worth it for you.
To plan the next step, try my Marriage Allowance calculator.
Why National Insurance gaps matter
Your State Pension is based on your National Insurance (NI) record. Each year you work and pay NI, or get NI credits, usually counts as a qualifying year.
- The full new State Pension is £241.30 a week in 2026/27.
- If your NI record started after April 2016, you need 35 qualifying years to get the full amount.
- You usually need at least 10 qualifying years to get any new State Pension at all.
A gap is a tax year that doesn’t count, for example because you were caring for children, living abroad, studying, unemployed without claiming benefits, or earning too little. Each missing year can mean a smaller State Pension for the rest of your life.
If you started work before April 2016, your amount depends on transitional rules and your record before then, so your forecast is the only way to see your own position.
Step 1: Check your State Pension forecast and NI record
This is free and takes a few minutes:
- Go to Check your State Pension forecast on GOV.UK (or use the HMRC app).
- Sign in with your Government Gateway or GOV.UK One Login.
- Look at your forecast: how much you could get and when.
- Then look at your NI record: it shows each tax year and whether it’s full or has a gap.
Your forecast will also tell you if you can improve your State Pension, and by roughly how much. That’s the key thing to look for.
Step 2: See if you can fill gaps for free (NI credits)
Before you pay anything, check whether you should have got National Insurance credits. These fill gaps at no cost. You may get them if you:
- Claimed Child Benefit for a child under 12. You get credits even if you chose not to receive the payments because of the High Income Child Benefit Charge, as long as you filled in the claim form.
- Cared for someone for 20 or more hours a week (Carer’s Credit).
- Got certain benefits, such as Universal Credit, Jobseeker’s Allowance, Employment and Support Allowance or Carer’s Allowance.
- Got Statutory Maternity, Paternity or Adoption Pay, or Statutory Sick Pay.
- Looked after a grandchild under 12 so the parent could work. Specified Adult Childcare credits let a parent transfer credits to a grandparent or other family member.
If you think you should have had credits for a year that shows a gap, contact HMRC or the Department for Work and Pensions before paying anything.
Step 3: Check the deadline for each gap
Normally, you can only pay voluntary contributions for the last 6 tax years. The deadline is 5 April each year. For example, GOV.UK says you have until 5 April 2032 to fill a gap in the 2025/26 tax year.
The special extended deadline that let some people fill gaps all the way back to 2006 ended on 5 April 2025. So older gaps are now usually too late to fill.
What do voluntary National Insurance contributions cost in 2026/27?
| Type | Who it’s for | Weekly rate 2026/27 | Roughly for a full year |
|---|---|---|---|
| Class 2 | Eligible self-employed people; some eligible pre-April 2026 periods abroad | £3.65 | about £190 |
| Class 3 | Most other people with gaps | £18.40 | about £957 |
You usually pay the current rate, although some earlier years can be paid at the rate for that year. HMRC tells you the exact cost for each year in your record, and you can usually pay online or through the HMRC app.
If you live or work abroad: from 6 April 2026 you cannot pay voluntary Class 2 contributions for time abroad in 2026/27 onwards. Class 3 eligibility and transitional rules apply instead. Earlier overseas years may still qualify for Class 2. Read HMRC’s current overseas National Insurance rules before paying.
Is it worth paying voluntary National Insurance? A worked example
Here’s an illustration for someone on the new State Pension rules who would gain a full extra qualifying year:
- Each qualifying year is worth about 1/35 of the full State Pension: £241.30 ÷ 35 = about £6.89 a week.
- That’s about £358 a year of extra State Pension, for life, at the 2026/27 rate, before tax. Future increases depend on pension uprating rules; some overseas pensions are not uprated.
- A full year of Class 3 costs about £957.
- So you’d get your money back in about 2 years and 8 months of drawing your pension, and over a 20-year retirement it could be worth around £7,000 or more.
That’s why paying can be such good value. But it only works if the year actually increases your pension, which brings us to the most important part.
When paying might NOT be worth it
- You’ll reach 35 qualifying years anyway before State Pension age, through work or credits.
- Your forecast says you’ll already get the full amount.
- You were “contracted out” before 2016 and the extra years wouldn’t raise your amount.
- You could get NI credits for that year for free.
- Your health means you may not draw the pension for long, or you need the money now for essentials or debts.
- It might affect means-tested benefits you’ll get in retirement, like Pension Credit.
The golden rule: check first, pay second. If your forecast says paying for a year would increase your pension, then it’s worth considering. If you’re not sure, contact the Future Pension Centre before paying.
How to pay voluntary National Insurance
- Check your forecast and NI record (Step 1).
- Identify which gaps would increase your pension and are still within the deadline.
- Use the HMRC app or the GOV.UK online service to pay, or call HMRC for a payment reference.
- Keep a record of what you paid and for which year.
- Check your record a few weeks later to make sure the year now shows as full.
Who should check their NI record?
Almost everyone, but especially if you:
- Took time off for children or caring
- Lived or worked abroad
- Were self-employed with low profits
- Moved to the UK as an adult
- Had years of low earnings or part-time work
- Didn’t claim Child Benefit because of the High Income Child Benefit Charge
That last one catches a lot of families. If your household is near £60,000 or more, see my Child Benefit tax calculator, and remember to fill in the claim form even if you don’t take the money, so the stay-at-home parent gets their NI credits.
National Insurance gaps: FAQs
How many years of National Insurance do I need for a full State Pension?
Usually 35 qualifying years for the full new State Pension, if your record started after April 2016. You need at least 10 years to get any.
How far back can I pay voluntary National Insurance?
Normally the last 6 tax years. For example, gaps in 2025/26 can be filled until 5 April 2032.
How much does a year of voluntary NI cost?
In 2026/27, Class 3 is £18.40 a week, about £957 for a full year. Class 2 is £3.65 a week, about £190, for those who can pay it.
Is it worth paying for missing NI years?
Often, yes, if your forecast shows it will increase your pension. One year can add about £358 a year to your State Pension for life. But check first, because it doesn’t help everyone.
Can I fill gaps for free?
Sometimes. NI credits can fill gaps if you claimed Child Benefit for a child under 12, were a carer, or got certain benefits.
Gaps in your National Insurance record: summary
- Your State Pension depends on your NI record. The 35-year rule applies where your record began after April 2016; earlier records have transitional calculations.
- Check your forecast and NI record free on GOV.UK.
- Look for free NI credits before paying.
- You can normally fill gaps from the last 6 tax years.
- A year of Class 3 costs about £957 and can add about £358 a year for life.
- Check first, pay second.
Have you checked your NI record yet? Tell me in the comments if you found any gaps.
Sources
- GOV.UK: Voluntary National Insurance (rates and deadlines, checked 9 October 2026)
- GOV.UK: New State Pension, what you’ll get
- GOV.UK: Check your State Pension forecast
- GOV.UK: National Insurance credits
I’m not a financial or pensions adviser; this is general information. For free, impartial pension guidance, contact MoneyHelper or Pension Wise. See my financial disclaimer.
Related guides and tools
- Marriage Allowance explained
- Marriage Allowance calculator
- Salary sacrifice pension calculator
- Budgeting during maternity leave
- ISAs explained
- Pension contributions and adjusted net income
Make your next money step easier
Start with my free 7-Day Financial Reset Kit. For a ready-made way to organise your plan, explore my Sinking Funds & Savings Pots Dashboard (my own product).
About the author: Dr Kalpana Govindaraasan is a UK mum, former science teacher and PhD scientist. MoneySavvyUK shares practical household money ideas and general information, with official sources linked so you can check the rules for yourself.