Nine hundred pounds that buys three hundred and thirty a year, for life

I have a note in my calendar every June that says, simply, "check the forecast". It takes about four minutes. It is, by a distance, the highest hourly rate I earn all year.

Not for me, particularly. For the people I end up mentioning it to afterwards.

Because there is a transaction available to a lot of people that pays roughly a third of its cost back annually, guaranteed, index-linked, for as long as they live. It is not an investment. It carries no risk of loss. And a very large number of people who could do it either don't know it exists or assume it must be a con.

It is a voluntary National Insurance contribution.

The arithmetic

Your State Pension is built out of qualifying years. Broadly, thirty-five of them gets you the full new State Pension, currently £12,547.60 a year. Ten is the minimum to get anything at all. In between, you get a proportion.

Most people accumulate those years without thinking about it, through working or through National Insurance credits they never knew they were receiving. But gaps happen, and they happen for entirely ordinary reasons.

Where you have a gap, you can often buy the year back. A full year of Class 3 voluntary contributions costs somewhere around £900. Each year bought typically adds around £330 a year to your State Pension.

Sit with that for a second.

You spend roughly £900. You get roughly £330 back every year, starting at State Pension age, rising with the triple lock, until you die.

You break even before your third year. Everything after that is profit. Someone reaching State Pension age at 67 and living to 87 receives around £6,600 in today's money from a single £900 payment, and rather more once the annual increases are counted.

I have spent my working life looking at returns. I cannot think of another one like it that is available to ordinary people, requires no risk, and is sitting there unclaimed.

Where the gaps come from

The gaps are rarely anyone's fault. The most common causes:

Years spent at home with children, where Child Benefit wasn't claimed. This is the big one, and it catches a specific group hard. Families where one partner earned enough for the High Income Child Benefit Charge to claw the payment back, so they sensibly concluded there was no point claiming. Claiming would have given the stay-at-home parent National Insurance credits for every one of those years. Not claiming gave them nothing.

Years working abroad.

Years self-employed with low profits, below the threshold at which contributions were due.

Years studying, travelling, or between careers.

Part-time work below the earnings threshold, which is more common than people expect.

None of these feel at the time like they are doing anything to your retirement forty years later. All of them can.

The check that matters more than the maths

Here is where I have to slow down, because this is the part that turns a brilliant decision into a wasted £900.

Buying a year only helps if it actually increases your pension.

If you are already on track to reach thirty-five qualifying years by the time you get to State Pension age, through the years you have left to work or credits you will receive, then buying an extra year adds precisely nothing. The money is simply gone.

This is the single most common expensive mistake in this whole area, and it is made by exactly the people who were trying to be sensible.

So the order of operations is:

One. Go to gov.uk and check your State Pension forecast. You will need a Government Gateway account, which takes a few minutes to set up. The forecast tells you what you are on track for, what you would get if you keep contributing, and which years have gaps.

Two. Before paying anything, contact the Future Pension Centre. They will confirm whether filling a specific gap would actually increase your pension. This is free, it is what they are there for, and it is the step that prevents the mistake.

Three. Check whether credits would cover the gap instead. Free beats paid. If a gap year was one where you were caring for a grandchild while their parents worked, Specified Adult Childcare Credits may cover it at no cost. Similar credits exist for various caring situations, and they are widely unclaimed.

Only then pay.

How far back can you go?

This is the constraint that has caught a lot of people out recently.

Normally you can only fill gaps from the last six tax years. There was an extended window that allowed gaps going back to 2006 to be filled, and it closed in April 2025. A great many people meant to look into it and didn't.

If your gaps are older than six years now, they may be beyond reach. If they are within six years, the clock is running.

What it looks like against the alternatives

Suppose you have £900 spare and a genuine gap that filling would close.

The comparison is almost unfair, and that is rather the point.

The honest complications

You have to live to collect it. This is a bet on longevity, and it pays nothing if you die before State Pension age. For someone in poor health, the arithmetic is genuinely different and worth thinking about properly.

Your money is gone immediately and the return starts later. If you are forty, you are paying now for income that starts in twenty-seven years. The return is still extraordinary, but it is not liquid and you cannot change your mind.

It can affect means-tested benefits. A higher State Pension can reduce entitlement to Pension Credit and the things that come attached to it. For someone likely to be on Pension Credit, buying extra years can be partly or wholly self-defeating. This is a real exception and it applies at the lower end, which is precisely where the money is hardest to spare.

The rules can change. The triple lock is a policy, not a law of nature, and the qualifying-years framework has been reformed before.

And the obvious one. If the forecast says you are already on track for the full amount, none of the above applies to you. Buying more years does nothing.

So, four minutes

Check the forecast. If there are gaps, ring the Future Pension Centre and ask whether filling them would increase your pension. If it would, and if credits won't cover it for free, this is one of the best things you can do with a few hundred pounds.

If it wouldn't, you have spent four minutes finding out that your State Pension is fine, which is worth knowing too.

I check mine every June. It has never once taken longer than a cup of tea.

This article is for general information and is not personal advice. Whether voluntary contributions increase your State Pension depends on your individual National Insurance record. Check with the Future Pension Centre before paying anything. Figures are illustrative and based on current rates, which can change.

If you would like to talk any of this through, get in touch.