State Pension Top-Up: How to Fill NI Gaps and Get More in Retirement

What is the State Pension top-up?

The full new State Pension (2025/26) is £221.20 per week — £11,502 per year. To receive the full amount, you need 35 qualifying years of National Insurance (NI) contributions. If you have gaps in your NI record — years when you didn't work, or earned below the lower earnings limit — you may receive less.

The good news: you can fill those gaps by making voluntary NI contributions, often at a cost that represents one of the best-value investments available to UK adults.

How much does it cost?

Voluntary Class 3 NI contributions cost £824.20 per missing year (2025/26 rate). Each qualifying year adds approximately £6.32 per week (£328.64/year) to your State Pension.

The payback period is roughly 2.5 years — meaning if you live even a few years into retirement, filling gaps almost always pays for itself many times over. For someone who lives 20 years in retirement, one £824 payment generates over £6,500 in additional income.

Who has gaps in their NI record?

• People who took time out to raise children (unless they claimed Child Benefit)
• Career breaks for caring responsibilities
• Periods of self-employment with low profits
• Time spent living or working abroad
• Periods of unemployment where you weren't claiming credits
• Part-time workers who earned below the lower earnings limit

How to check your NI record

Log in to your HMRC personal tax account at gov.uk to see your full NI record, including which years are complete, which have gaps, and how much the full new State Pension would be based on your current record. You can also see your State Pension forecast — the projected amount based on contributions so far.

Deadlines — act now

Historically, you could only fill gaps going back 6 years. However, the government has extended the window for filling gaps from 2006 onwards — but this extended deadline has been subject to change. Don't delay — if you have gaps from earlier years, they may soon fall outside the fillable window.

NI credits — the free alternative

Before paying for missing years, check whether you're entitled to free NI credits you haven't claimed. These are available for:

• Child Benefit recipients (even if you opted out of payments)
• Carers of people with disabilities
• Those receiving certain benefits
• People between jobs who sign on

Backdating Child Benefit claims, in particular, can fill years of NI gaps at no cost. A financial adviser can review your entitlements and recommend the most cost-effective approach.