Paying voluntary National Insurance to fill gaps

If your National Insurance record has gaps, you may be able to pay voluntary contributions to fill them, and each extra qualifying year you buy is worth around £6.89 a week on your State Pension¹. The full new State Pension is £241.30 a week, or £12,547.60 a year, and you need 35 qualifying years of contributions or credits to reach it¹. Ten qualifying years is the minimum to get anything at all, currently around £68.90 a week².

Voluntary contributions are not free money and they do not always pay off. The official guidance is blunt: voluntary contributions do not always increase your State Pension³. Whether they do depends on how many years you already have, how close you are to 35, and whether you are buying years that would have counted anyway. That is why the first step is always to check your record and your forecast, not to pay.

This page sets out what a gap is, what a qualifying year is worth, what topping up costs, when it will not help, and how to check before you pay anything.

What a gap in your National Insurance record means for your State Pension

A qualifying year is a tax year in which you had enough earnings and paid National Insurance contributions, or received National Insurance credits, or paid voluntary contributions⁸. A gap is a tax year that does not qualify, usually because you were not working, were working but earning too little, were self-employed with low profits, were abroad, or were not claiming benefits that bring credits with them¹⁰.

Gaps matter because the State Pension is built from qualifying years. Gaps can affect entitlement to benefits like New Style Jobseeker's Allowance, New Style Employment and Support Allowance, the Basic State Pension and the new State Pension¹⁰. For the State Pension specifically, each missing year is a slice of weekly income you do not receive for the whole of your retirement.

There are several ways a year can fail to qualify. Buying partnership shares through a share incentive plan can bring your earnings below the lower earnings limit, so you may not have made enough National Insurance contributions for that year¹¹. Time spent abroad, self-employment with low profits, and periods of unemployment without benefit claims are all common causes¹².

If you have already reached State Pension age and want to fill gaps, you can pay Class 3 contributions³. If you are above State Pension age, you need to contact the Pension Service to check whether you have a gap, and they will also tell you whether it would benefit you to make a payment³. If you have not reached State Pension age, you can check your State Pension forecast or contact the Future Pension Centre to find out whether you would benefit from paying voluntary contributions¹³.

Qualifying years: 10 to get anything, 35 for the full £241.30 a week

The structure of the new State Pension is simple in outline. You need 10 qualifying years to get anything, currently around £68.90 a week, and 35 years of qualifying contributions to get the full amount, currently £241.30 a week². Each qualifying year is worth around £6.89 a week, so 20 years would give you about £137.80².

To get the maximum amount of £241.30 a week in 2026-27, you must have paid National Insurance contributions or had National Insurance credits for 35 years¹⁴. The same 35-year figure appears in the official guidance on the new State Pension¹.

The old State Pension works differently. The full State Pension under the old rules is £184.90 per week for people with at least 30 years of National Insurance contributions¹⁵. If you reached State Pension age before the new State Pension was introduced, or you have a mixture of old and new entitlement, your position may be different from the table above, and the forecast is the only reliable guide to your own figure.

The State Pension is usually paid every four weeks, rather than on the same date each month². It is paid to you without tax taken off; instead, your tax code is usually changed so you pay any tax due from other income².

Each extra qualifying year is worth around £6.89 a week

The arithmetic of topping up is the part most people want. One extra qualifying year adds around £6.89 a week, or about £359 a year, based on the full level of State Pension in 2026-27⁴. Against that, buying a year costs £17.45 a week or £907.40 for the year⁵.

The cost of voluntary contributions has been rising. The rate was increased to £17.75 per week from 6 April 2025, in line with September CPI¹⁶. For the tax year 2026 to 2027, the figure for voluntary Class 3 contributions is £18.40 a week⁶. Older sources still quote £17.75 a week or £921 a year, which was the position before the most recent uprating¹⁷.

There is also a cheaper Class 2 route for some people. The weekly rate of a Class 2 National Insurance contribution is £3.65 for April 2026 to April 2027¹⁸. Class 2 is normally associated with self-employment, and the eligibility rules differ from Class 3, so which class applies to you is a question for the forecast and the contribution office rather than a general rule.

The comparison that matters is between the one-off cost and the annual income it buys. A year bought at £907.40 that adds £359 a year takes a little over two and a half years of State Pension to repay, and then continues for life. That is the shape of the decision, but it is not the whole decision, because the next section explains why a bought year sometimes adds nothing.

When filling a gap may not add to your State Pension

The official position is that voluntary contributions do not always increase your State Pension³. There are several distinct reasons a payment can fail to add anything.

The first is that you may already be at the maximum. Once you have 35 qualifying years, buying more does not raise your State Pension, because £241.30 a week is the full amount¹.

The second is the look-back limit. Voluntary payments to cover gaps can only go back six years⁷. You can usually pay voluntary contributions to cover the previous six years, and the deadline is 5 April each year for the year that drops out of that window¹⁹. A temporary extension once allowed gaps from 2006-07 onwards to be filled for people transitioning to the new State Pension system, but that was a time-limited arrangement²⁰.

The third is that the top-up service itself is not open to everyone. The online service is not available for State Pension recipients, self-employed individuals, or those abroad with gaps from working overseas²⁰. Those groups have to use other routes.

The fourth is cost at scale. Someone with 10 missing years could pay out a little over £8,000 to fix the gaps²¹. That is a large sum, and it buys roughly £68.90 a week at current rates, so the decision deserves the forecast rather than a rule of thumb.

Checking your record before you pay

You can find out if you have any missing or incomplete National Insurance qualifying years, and how much they will cost to fill, at gov.uk check-national-insurance-record⁴. That is the starting point for everyone.

If you have not reached State Pension age, you can check your State Pension forecast or contact the Future Pension Centre to find out whether you would benefit from paying voluntary contributions¹³. If you are above State Pension age, you need to contact the Pension Service to check whether you have a gap, and they will also tell you whether it would benefit you to make a payment³.

For Class 2 contributions, you need to register with HM Revenue and Customs if you do not pay through Self Assessment²². Once registered, HMRC will send you a payment request each year until you tell them you no longer want to pay voluntary contributions, you stop being self-employed, or you reach State Pension age²².

There is a separate application route for paying voluntary Class 3 contributions for periods abroad¹³. If you were self-employed or paying voluntary National Insurance and someone has died, the National Insurance Contributions Office should be contacted to cancel the payments²³.

Paying voluntary contributions from abroad

You can claim State Pension abroad if you have paid enough UK National Insurance contributions to qualify²⁴. If you have gaps, you might be able to increase the amount by delaying your pension, or by paying voluntary contributions to fill gaps in your National Insurance record²⁴.

The mechanics differ for people who spent time working overseas. There is a dedicated application process for paying voluntary Class 3 contributions for periods abroad¹³. The online top-up service is not available for those abroad with gaps from working overseas, so the paper route applies²⁰.

If you are claiming benefits in Europe or the European Economic Area, the rules on how UK contributions and periods abroad interact are set out separately²⁵. Moving into a residential care or nursing home does not affect your State Pension, but it will be counted as income when your contribution to your fees is assessed²⁶.

Deferring instead of topping up

Delaying your State Pension is a separate option from paying voluntary contributions, and it can also raise what you eventually receive. You might be able to increase the amount you get if you delay your pension²⁷. The same option is available to people claiming from abroad²⁴.

There is a limit to how much deferral can add. You do not build up an increase for any week in the deferral period in which you receive an overlapping benefit, including Severe Disablement Allowance, Incapacity Benefit, Carer's Allowance, Widow's Pension, Widowed Mother's Allowance and Unemployability Supplement²⁹.

Deferral and topping up are not mutually exclusive. Someone with gaps and a short time before claiming could, in principle, do both, but the forecast is what shows whether either adds anything in a particular case.

Claiming the State Pension and working

You can claim your State Pension once you reach State Pension age, which is currently 66 and is increasing gradually over the next two years until it reaches 67³⁰. A letter with an invitation code arrives around four months before you reach State Pension age, and the claim can be made online, by phone or by post depending on where you live; there is no time limit to apply².

Reaching State Pension age does not require you to stop working, and claiming does not end your employment³¹. If you are both employed and self-employed and earn less than £129 from employment and have profits of less than £7,105 from self-employment, you can check your State Pension forecast to find out whether you would benefit from paying voluntary contributions³.

If you are caring for someone, National Insurance credits may already be protecting your record, which is worth checking before paying for a year you may already hold¹⁴. Carers can build State Pension entitlement through credits rather than contributions in some circumstances¹⁴.

Where to get free help

The State Pension forecast and record check are free on gov.uk, and the Future Pension Centre and Pension Service give free guidance on whether a voluntary payment would benefit you³. Pension Wise offers free, impartial guidance on pension options³².

If you are dealing with debt and considering using money to top up your State Pension, free debt advice is available from charities including StepChange³³. An individual voluntary arrangement is recorded on the Individual Insolvency Register in England and Wales, and on the Register of IVAs in Northern Ireland³³.

For anything that goes wrong with a State Pension decision, the normal complaint routes apply, and the Pensions Ombudsman can look at pension complaints.