How to Check — and Top Up — Your State Pension Before the Deadline Moves

Gaps in your National Insurance (NI) record can quietly shrink your State Pension for decades, but most people never check until it's too late to fix cheaply. Here's how the top-up system actually works right now.

How State Pension gaps happen

You typically need 35 qualifying NI years for the full new State Pension, and at least 10 to get anything at all, under the rules set out on gov.uk. Gaps commonly appear from time spent self-employed with low profits, working abroad, unemployment without claiming credits, or career breaks for caring responsibilities that weren't correctly credited.

The rules on filling gaps

Normally, you can pay voluntary Class 3 contributions to fill gaps going back up to six tax years, with each year's deadline falling on 5 April, resetting annually — so as things stand you have until 5 April 2027 to buy back gaps as far back as 2020/21, according to MoneyHelper. For the specific 2025/26 tax year, you have considerably longer — until 5 April 2032 — to make up any gap, per Standard Life's guidance.

What it costs — and what you get back

A full year of Class 3 voluntary contributions for 2025/26 costs around £923 (£17.75 a week), according to Abode Financial Planning. Each qualifying year typically adds roughly 1/35th of the full new State Pension to your annual entitlement for life, index-linked under the triple lock — for many people that means a one-off payment of under £1,000 pays for itself within three to four years of retirement.

It isn't automatically worth it for everyone

Crucially, MoneyWeek notes that voluntary contributions don't always increase your pension — if you're already on track for the full amount, or you're not far off state pension age with limited years left to benefit, topping up may not pay off. The free Future Pension Centre can tell you whether a specific gap year would actually raise your forecast before you pay anything.

Checklist: check and fix your State Pension record

• Get your free State Pension forecast online in under 10 minutes using your Government Gateway login.
• Review your NI record year by year to spot which years are marked as gaps.
• Check if you qualify for free NI credits instead of paying — for example if you claimed Child Benefit, were a carer, or were unemployed and eligible for credits, per nidirect guidance.
• Call the Future Pension Centre before paying anything, to confirm a given year will actually raise your forecast.
• If it's worth it, pay voluntary Class 3 contributions via gov.uk before the relevant year's deadline.
• Set a reminder to recheck your forecast every few years, especially after any career break, in case new gaps appear.

Key Numbers

• 35 years — qualifying NI years typically needed for the full new State Pension
• £923 — approximate cost of one full year of Class 3 voluntary contributions for 2025/26
• 5 April 2027 — current deadline to buy back gaps as far back as 2020/21
• 10 years — minimum NI years needed to qualify for any State Pension at all

Sources

• gov.uk: The new State Pension
• gov.uk: Check your State Pension forecast
• MoneyHelper: Voluntary National Insurance contributions and the State Pension
• Standard Life: Voluntary National Insurance contributions
• Abode Financial Planning: How to boost your State Pension
• MoneyWeek: Reasons not to top up your State Pension

Educational content only — not financial advice.