Every time you pay into a pension, the government hands back the tax you already paid on that money. Most of it arrives automatically. One part of it does not — and if you pay above the basic rate, that part sits with HMRC until you ask for it. Work out what goes into your pot, what it really costs you, and what you may still be owed.
Not sure? Look at your payslip. If the pension deduction comes off after tax, it is relief at source — and that is the one where higher-rate taxpayers have to claim the rest themselves. If it comes off before tax, it is net pay or salary sacrifice, and you already have all your relief.
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An illustration for a standard tax code, based on 2026/27 and 2025/26 UK rates — not financial advice, and not a statement of what you are owed. It assumes a steady salary across the year and ignores any other income, benefits in kind or tapered annual allowance. Relief is limited to 100% of your earnings and to the annual allowance. If you think relief is owed to you, check with HMRC. Nothing you enter is stored or sent anywhere.
There are three ways a pension takes your money, and they are not equally generous with your time. Under a net pay arrangement or salary sacrifice, your contribution comes out before tax is worked out, so you get every penny of relief at your own tax rate without lifting a finger. Salary sacrifice goes one better and saves National Insurance too.
Under relief at source, something different happens. Your provider reclaims the basic rate for you — that is the £20 added to every £80 you pay in — but it stops there. If you are a higher-rate or additional-rate taxpayer, the difference between the basic rate and your rate is not sent to you. It has to be claimed, through Self Assessment or by asking HMRC to change your tax code. People who do not file a tax return are the likeliest to miss it, and it is perfectly possible to have missed it every year you have been paying in.
One detail that catches people out: the extra relief only applies to income that was actually taxed at the higher rate. If just £3,000 of your income sits above the threshold, a £10,000 contribution can only rescue that £3,000 — the rest already had its basic-rate relief and gets nothing more. A calculator that takes a flat 20% of your whole contribution will tell you that you are owed more than you are. This one works it out band by band, which is why the figure is usually smaller and rather more believable.
The most generous case is not the highest earner but the one caught between £100,000 and £125,140, where the personal allowance is being withdrawn. A pension contribution there can win back both the higher-rate relief and the allowance at once, at an effective rate of around 60% — and 67.5% in Scotland. The same threshold governs whether a household keeps Tax-Free Childcare, which is also tested on adjusted net income. We cover the whole thing in the £100,000 tax trap.
Once you know what you are owed, claiming it takes about fifteen minutes — and you do not need to file a Self Assessment return to do it.
Money you put into a pension hasn’t been taxed yet. Rather than let you pay income tax on it and then save it, the government gives that tax back — so a pension contribution costs you less than the amount that lands in your pot. At the basic rate, £100 in your pension costs you £80. The higher your tax rate, the less it costs you, which is why the same £100 can cost a higher-rate taxpayer £60.
Look at your payslip. If your pension contribution is taken after tax has been worked out, you’re on relief at source — your provider adds 20% to your pot automatically, and anything above the basic rate is yours to claim. If it comes off before tax, it’s a net pay arrangement or salary sacrifice, and you already have all your relief. Our guide to relief at source vs net pay covers all three arrangements, and what each means if you are a higher-rate taxpayer or a very low earner.
Only on relief at source, and only if you pay above the basic rate. Your provider reclaims the basic rate for you without being asked. The rest — the difference between the basic rate and your own tax rate — is not sent automatically. You have to claim it, through a Self Assessment return or by asking HMRC to adjust your tax code. People who don’t file a tax return are the most likely to miss it, sometimes for years — often because they assume it only applies to people who do tax returns. It doesn’t. Our guide to claiming higher-rate pension tax relief walks through all three routes.
Usually yes, though how far back depends on the route you use and on your circumstances — and some of the time limits quoted online are out of date. The claiming guide covers the current position, and HMRC can confirm which years are still open to you.
Because higher-rate relief only applies to the part of your income that was actually taxed at the higher rate. If only £3,000 of your income sits above the higher-rate threshold, a £10,000 contribution can only rescue that £3,000 from the higher rate — the rest already had basic-rate relief and gets no more. Calculators that simply take 20% of the whole contribution will overstate what you are owed.
Yes — Scotland has six tax bands to the rest of the UK’s three, so there are six different answers rather than two. Providers still add 20% at source wherever you live. Pension tax relief in Scotland sets out what you can claim at each rate, including the starter-rate quirk that leaves you slightly ahead.
A cap on how much can go into your pensions each year with tax relief — your contributions and your employer’s together. Going over can bring a tax charge. The allowance is lower for very high earners and for anyone who has already flexibly accessed a pension, and unused allowance from previous years can sometimes be carried forward. This calculator flags the standard limit only; if you are anywhere near it, get the figure checked properly.
It saves National Insurance as well as income tax, so the same pension pot costs you less. But it works by lowering your gross salary — the figure mortgage lenders, statutory parental pay and life cover are often based on. It is a trade-off rather than a free win, and it is also changing from April 2029. We weigh it up in salary sacrifice: what you gain and what you give up.
No. This is general information and an illustration based on published rates, not advice about what you should do with your money or your pension. It cannot tell you whether HMRC owes you anything — only HMRC can. If you want advice tailored to your situation, speak to a regulated financial adviser; for free, impartial guidance, MoneyHelper is a good place to start.
Relief is easier to judge when you can see the take-home figure move. Change your pension percentage and watch what actually lands in your account.
