Pension Tax Relief Explained

Last updated: July 2026 · 6 min read

Pension tax relief is the closest thing to free money in UK personal finance. Put £100 into your pension and, depending on your tax rate, it can cost you as little as £80, £60 or even £55 of take-home pay. The catch is that thousands of higher earners never claim their full share, because part of it does not arrive automatically.

How the top-up works

The idea is simple: money you put into a pension is not taxed as income. In practice the relief arrives in one of two ways, and it is worth knowing which your scheme uses.

Relief at source

Used by personal pensions, SIPPs and many workplace schemes. You pay in from taxed income, and your provider claims 20% basic-rate relief from HMRC and adds it to your pot. Pay in £80 and £100 lands in your pension. This happens automatically for everyone, whatever you earn.

Net pay

Used by many workplace schemes, including most defined benefit schemes. Your contribution comes out of your salary before income tax is worked out, so you get your full relief immediately through payroll. Nothing to claim, whatever your tax rate.

Higher earners: check you are not leaving money behind

Here is the part people miss. In a relief at source scheme, the provider only ever adds the 20%. If you pay 40% or 45% tax, you are owed more, and you have to claim it yourself through Self Assessment or by contacting HMRC. The extra comes back to you as a tax refund or an adjusted tax code rather than landing in your pension.

Your income tax rate	Cost of £100 in your pension	Claimed automatically?
Basic rate (20%)	£80	Yes
Higher rate (40%)	£60	Only the first £20; claim the rest
Additional rate (45%)	£55	Only the first £20; claim the rest

The claim can usually be backdated four tax years, so if you have been a higher-rate taxpayer paying into a relief at source pension without claiming, there may be a meaningful refund waiting. Scottish income tax bands and rates differ, so the relief you can claim in Scotland differs too; the same claim-it-yourself principle applies above basic rate.

The limits: how much you can pay in

Two ceilings matter for most people in 2026/27 (source: GOV.UK and HMRC guidance):

• Your earnings. Personal contributions only get tax relief up to 100% of your UK earnings for the year (or £3,600 gross if you earn less than that).
• The annual allowance: £60,000. This covers everything going into your pensions in a tax year, including employer contributions and the tax relief itself. Go over it and the excess is added to your taxable income.

Unused annual allowance can be carried forward from the previous three tax years if you were in a pension scheme during them, which is how people shelter a bonus or a business sale. Two groups have lower limits: very high earners (the allowance tapers away above £260,000 of adjusted income, down to a floor of £10,000), and anyone who has flexibly taken money out of a defined contribution pension, whose allowance for further contributions drops to £10,000 under the Money Purchase Annual Allowance.

Salary sacrifice: still the best deal, but a change is coming

Some employers offer salary sacrifice, where you give up salary and they pay it into your pension instead. Because the sacrificed pay never reaches you, you save National Insurance on it as well as income tax, and many employers pass on some of their own NI saving too. For now it is usually the most efficient way to contribute.

From April 2029 this gets trimmed. The November 2025 Budget capped the National Insurance exemption at £2,000 of sacrificed salary a year; anything above that will attract employee and employer NI, though income tax relief is unchanged (source: GOV.UK, Changes to salary sacrifice for pensions from April 2029). If you sacrifice more than £2,000 a year, it is worth a fresh look at your numbers nearer the time, not a reason to stop contributing now.

What to do next

• Find out whether your scheme uses relief at source or net pay; your pension provider or payroll team can tell you.
• If you pay 40% or 45% tax into a relief at source scheme, claim the extra relief, and consider backdating up to four years.
• Check your total contributions against the £60,000 annual allowance if you or your employer pay in a lot.
• If your employer offers salary sacrifice, compare your payslip both ways; the NI saving is often worth hundreds a year.

This article is for general information only and does not constitute financial advice. Figures relate to the 2026/27 tax year and are correct as of July 2026; allowances and rules change. Tax treatment depends on your individual circumstances. For advice tailored to you, speak to a financial adviser regulated by the Financial Conduct Authority (FCA), or get free guidance from MoneyHelper.