If you pay into a pension, some of the income tax you would have paid goes into your retirement savings instead. That is the whole idea of pension tax relief. The mechanism can work in several different ways depending on which type of pension scheme you are paying into. This guide explains the main methods for the 2026/27 tax year (6 April 2026 to 5 April 2027), with worked examples for each.
What pension tax relief means
Pension tax relief means contributions you make are topped up or shielded from income tax, up to certain limits. You can get relief on personal contributions worth up to 100% of your earnings each year. If you have little or no earnings, you can still pay in up to £3,600 a year and get relief — that's £2,880 from you, with £720 of basic-rate relief added by the government.
Workplpace pension contributions can be handled in various different ways, each affecting your tax and national insurance slightly differently. Personal contributions to a SIPP or personal pension also attract tax relief but money your employer pays in works differently.
Types of workplace pension
Most workplace pensions use one of three methods.
Relief at source. Your contribution is taken from your pay after income tax has been worked out. Your pension provider then claims 20% basic-rate relief from HMRC and adds it to your pot. So if £80 comes out of your wages, the provider tops it up to £100 in the pension. You get basic-rate relief automatically, even if you don't pay income tax. If you're a higher- or additional-rate taxpayer, the extra relief above 20% isn't automatic — see the SIPP and personal pension section below, which works the same way.
Net pay. Your contribution comes out of your pay before income tax is calculated, so your taxable pay is lower and you get full relief at your highest rate straight away — no separate claim needed. The downside is that net pay reduces income tax but not national insurance, and it doesn't help anyone who earns too little to pay income tax, because there's no tax to relieve.
Salary sacrifice. You agree to give up part of your salary, and your employer pays that amount into your pension as an employer contribution. Because your gross salary is lower, you currently save both income tax and national insurance on the sacrificed amount, and your employer saves their national insurance too. Some employers add part of their own saving to your pension.
A salary sacrifice arrangement can have knock-on effects. Because your salary on paper is lower, it can change anything linked to that figure: mortgage affordability checks, life cover set as a multiple of salary, and statutory payments such as maternity pay. There's also a change coming: from April 2029, only the first £2,000 of employee pension contributions made through salary sacrifice each year will be exempt from national insurance. Anything above that will face employer and employee national insurance like an ordinary contribution. The income tax treatment is not changing, and the government expects most people making typical contributions to be unaffected.
Here's how the three compare on a £100 monthly gross contribution.
| Method | When the contribution is taken | Income Tax relief | National Insurance saving | Extra higher-rate claim? |
|---|---|---|---|---|
| Relief at source | After tax; provider adds 20% | 20% automatic, in the pot | No | Yes, if you pay above 20% |
| Net pay | Before Income Tax | Full relief at your top rate, automatic | No | No |
| Salary sacrifice | Salary reduced; employer pays in | Full relief, automatic | Yes (capped at £2,000 from April 2029) | No |
How to tell which one you're on. Check your payslip and pension documents. If your pension deduction sits after the tax line and your provider statement shows a government top-up, that's relief at source. If the deduction comes off before tax is calculated and there's no top-up in the pot, that's net pay. If your gross salary itself is reduced and the pension shows entirely as an employer contribution, that's salary sacrifice. If it's still unclear, your HR or payroll team can confirm. The salary sacrifice pension calculator shows the tax and national insurance effect of that method, and the salary calculator helps you see how any pension deduction changes your take-home pay.
SIPP and personal pension contributions
If you pay into a self-invested personal pension (SIPP) or another personal pension outside your workplace scheme, it almost always uses relief at source. You pay in from money you've already been taxed on, and the provider adds 20%. Pay in £80 and £100 lands in the pension.
For a basic-rate taxpayer, that's the end of it. For a higher- or additional-rate taxpayer, the automatic top-up only covers the basic 20%, so the rest must be claimed separately. In England, Wales and Northern Ireland you can claim a further 20% on contributions covered by income you paid 40% tax on and 25% on income you paid 45% tax on. The rates are different for Scottish tax payers as there are more tax bands.
Higher-rate SIPP example. Priya earns £65,000 and pays £8,000 into a SIPP during the year. The provider adds £2,000 in basic-rate relief, so £10,000 goes in. Because some of her income is taxed at 40%, she can claim back a further 20% of that £10,000 — £2,000 — through her tax return. The £10,000 still sits in her pension; the extra £2,000 comes back to her as a reduction in her tax bill.
You claim the extra relief on a Self Assessment tax return if you file one. If you don't, GOV.UK has a claim service for private pension payments and HMRC may give the relief by adjusting your tax code instead. The relief isn't given automatically, so higher and additional-rate taxpayers who never claim can miss out year after year. The pension contribution tax calculator shows the higher-rate portion you may be able to reclaim for your specific situation.
Employer pension contributions
When your employer pays into your pension, that payment is generally not treated as taxable earnings for you. You don't pay income tax or national insurance on it, and it isn't something you "claim relief" on — it arrives untaxed in the first place.
One thing to watch: employer contributions still count towards your annual allowance, alongside anything you and anyone else pay in. So a generous employer contribution can use up the same £60,000 cap that your own contributions do. More on that next.
If you've been automatically enrolled, there are legal minimums. The total minimum contribution is 8% of your qualifying earnings, of which your employer must pay at least 3% and you make up the rest (usually 5%). For 2026/27, qualifying earnings are the slice of pay between £6,240 and £50,270. Many employers pay more than the minimum, and some base contributions on your full salary rather than just the qualifying band.
Limits to be aware of
Pension tax relief isn't unlimited. Two separate caps can apply.
The earnings limit on your own relief. You can only get tax relief on personal contributions up to 100% of your earnings in the year (or up to £3,600 gross if you earn little or nothing). If you pay in more than this the excess doesn't attract relief. It's up to you to stay within this and HMRC can ask for any over-claimed relief back.
The annual allowance. This is the most that can be saved across all your pensions in a year before a tax charge applies. For 2026/27 it's £60,000. It counts everything going in — your contributions, the basic-rate top-up, your employer's contributions, and the growth in any defined benefit pension. Note how this differs from the earnings limit: the annual allowance includes your employer's contributions, while your personal relief limit is based on your own contributions only.
If you don't use your full allowance, you may be able to carry forward unused allowance from the previous three tax years, provided you were a pension scheme member in those years. The rules here can be complex, so it's worth checking with your accountant or financial advisor if you are unsure.
Two situations can reduce the £60,000 allowance:
The tapered annual allowance. High earners get a reduced allowance. It applies only if both your "threshold income" is over £200,000 and your "adjusted income" is over £260,000. The allowance tapers down by £1 for every £2 of adjusted income over £260,000 to a minimum of £10,000. Working out your threshold income and adjusted income can be complicated and is beyond the scope of this guide so talk to your tax advisor to check if the taper applies to you.
The money purchase annual allowance (MPAA). Once you've flexibly accessed a defined contribution pension — for example, by taking taxable cash from a pot — the amount you can keep paying into money purchase pensions drops to £10,000 a year, and you can't use carry forward to lift it.
Going over the annual allowance doesn't usually undo your relief, but it does create a tax charge that effectively claws back the relief on the excess. You report it through self assessment, even if your pension scheme pays part of the charge for you.
How pension contributions affect adjusted net income
Pension relief can do more than cut the tax on the contribution itself. For relief-at-source contributions, the grossed-up amount also reduces your adjusted net income — the income figure HMRC uses for several thresholds. Lowering it can have knock-on benefits.
The personal allowance is reduced once adjusted net income passes £100,000, falling by £1 for every £2 above that until it disappears at £125,140. And the high income child benefit charge starts at £60,000 of adjusted net income, with all the benefit clawed back by £80,000. A relief-at-source pension contribution can bring your adjusted net income down and reduce the effect of the personal allowance taper and high income child benefit charge.
Worked example. Tom earns £105,000 and pays £4,000 into a SIPP. With basic-rate relief that's a £5,000 gross contribution, which reduces his adjusted net income to £100,000. Without the contribution he would lose £2,500 of his personal allowance, creating an effective income tax rate of 60% on the top £5,000 of his income. See the 60% tax trap guide to understand this in more detail. The pension contribution restores the lost personal allowance, saving an extra £1,000. That comes on top of the £1,000 basic-rate top-up and £1,000 higher-rate relief on the contribution itself.
The mechanics differ by method. Net pay and salary sacrifice lower your taxable income or your salary directly, while relief-at-source contributions reduce adjusted net income through the grossed-up figure. The interactions can get involved, especially around the £100,000 mark, so the pension contribution tax calculator is a good way to test your own numbers, and complex cases are worth checking against the GOV.UK adjusted net income guidance.