Pension Tax Relief Explained

The two routes relief takes

Relief at source covers most personal pensions, SIPPs and many workplace schemes. Your contribution comes out of pay that has already been taxed, and the provider claims 20% back from HMRC and adds it to your pot. Pay £80 and £100 lands. If you are a higher or additional rate taxpayer, the rest of your relief is not automatic: you claim it yourself.

Net pay arrangement takes the contribution off your gross salary before income tax is worked out, so relief at your marginal rate is immediate and there is nothing to claim. It is common in larger employer schemes and the public sector. Low earners below the personal allowance used to get nothing under net pay while relief at source paid them 20% anyway. HMRC now makes top-up payments to close that gap.

Your payslip settles which one you are on. Deducted before tax is net pay. Deducted after tax is relief at source.

What a £1,000 contribution costs you

Figures below are 2026/27 rates for England, Wales and Northern Ireland.

The higher and additional rate columns assume the whole contribution sits inside that band. Contribute enough and part of it drops into the band below, which lowers your effective relief. A £10,000 contribution from a £60,000 salary only gets 40% relief on the first £9,730, because that is all the income you have above the £50,270 higher rate threshold.

Scottish taxpayers have six bands in 2026/27: starter 19%, basic 20%, intermediate 21%, higher 42%, advanced 45% and top 48%. Relief follows the Scottish rate you actually pay. Under relief at source the provider still reclaims 20%, and you claim the balance, so an advanced rate Scottish taxpayer is claiming a further 25 percentage points rather than the 20 an English higher rate taxpayer claims.

Where salary sacrifice actually helps, and where it is oversold

Under salary sacrifice you give up gross pay and your employer pays the full amount into the pension. The sacrificed slice escapes income tax and National Insurance on both sides.

The National Insurance part is the bit that gets misreported. Employee NI in 2026/27 is 8% on earnings between £12,570 and £50,270, and 2% above £50,270.

Take a £62,000 salary sacrificing £4,800:

Salary falls from £62,000 to £57,200. Both figures are above £50,270, so every pound sacrificed comes off pay that was attracting 2% NI.Income tax saved: £1,920 (40% of £4,800).NI saved: £96 (2% of £4,800).Net cost: £2,784.

Through relief at source the same £4,800 costs £2,880: you pay £3,840, the provider adds £960, and you reclaim £960. Sacrifice wins by £96 a year. Compounded at 5% for twenty years that difference is worth about £3,174, which is real money and is nothing like the case usually made for it.

Sacrifice does far more work lower down the income scale. A basic rate earner sacrificing £2,000 out of pay inside the 8% band saves £160 of NI on top of £400 of income tax, and that is a 28% total saving on money that would otherwise have been taxed twice. If your sacrifice straddles £50,270 you get a mix: from a £54,000 salary, sacrificing £6,000 saves £256.20 of NI and £1,946 of income tax, a net cost of £3,797.80.

So the position we will defend: salary sacrifice is undersold to basic rate earners and oversold to higher rate earners. The pitch aimed at people earning £70,000 is usually built on an 8% NI saving they are not making. The real reasons to prefer it at that income are that relief is immediate rather than reclaimed a year later, and that many employers pass back some of their own 15% NI saving as an extra contribution. Ask whether yours does. That contribution, if it exists, is worth more than the NI arithmetic that gets advertised.

Claiming what relief at source does not give you automatically

If you are in a relief at source scheme above the basic rate, the extra relief only arrives if you ask. Two routes:

Enter your total gross contributions, including the 20% the provider already reclaimed, in the pension section of your self assessment return. Or, if you do not file one, contact HMRC and ask for a tax code adjustment, which spreads the relief across future pay packets instead of arriving as a refund.

You can go back four tax years. A 40% taxpayer putting £5,000 a year into a relief at source pension without claiming is leaving £1,000 a year behind, and four years of that is £4,000 sitting with HMRC rather than in the pot.

The ceiling on tax relief

Relief is capped twice over. The annual allowance is £60,000 for 2026/27, counting your contributions, your employer's and any personal ones together. Separately, relief on your own contributions is limited to 100% of your relevant UK earnings that year, or £3,600 if you have little or no earnings. The annual allowance is the one people quote; the earnings cap is the one that actually binds.

Adjusted income above £260,000 tapers the allowance down by £1 for every £2 over, to a floor of £10,000, and only if threshold income also exceeds £200,000. Unused allowance from the previous three tax years can be carried forward, which is covered in SIPP carry forward.

For what your employer is obliged to add alongside your own contributions, see employer pension contributions. To model the effect on a real salary, use the UK pension calculator.

Rates: GOV.UK, rates and thresholds for employers 2026 to 2027 and tax on your private pension contributions. This page explains the rules rather than recommending a course of action, and individual circumstances change the answer.