Pension Tax Relief Calculator

Pension tax relief gives back the income tax already paid on money before it reaches the pension. Under relief at source, the method used by most personal pensions and SIPPs, you contribute from net pay and the provider claims 20% basic rate relief from HMRC automatically, so an £80 net contribution becomes £100 gross in the pot. Higher-rate and additional-rate taxpayers collect the remainder through self-assessment: on a £100 gross contribution a 40% taxpayer ends up with £40 of relief, £20 added at source and £20 reclaimed on the tax return, while an additional-rate taxpayer reclaims 25%.

Net pay arrangements, common in workplace schemes, deduct contributions before income tax is calculated, so the full relief arrives immediately whatever your rate and nothing has to be claimed back. A £100 gross contribution costs a basic-rate taxpayer £80, a higher-rate taxpayer £60 and an additional-rate taxpayer £55. Scottish taxpayers work to the Scottish rates of 19, 20, 21, 42, 45 and 48%, which changes the arithmetic band by band: relief at source still adds 20% for a starter-rate (19%) taxpayer, and intermediate-rate payers claim the extra 1% through self-assessment. A third route, salary sacrifice, takes the contribution from gross pay before both income tax and National Insurance, which makes it the most efficient of the three.

The gap between salary sacrifice and relief at source shows up clearly on £1,000. Under relief at source a higher-rate taxpayer puts in £800 of net income, HMRC adds £200 of basic-rate relief, and another £200 comes back through self-assessment, so £400 of tax is saved on the £1,000 once grossed up and the net cost is £600. Sacrifice £1,000 of gross salary instead and take-home falls by only £580, because neither the 40% income tax nor the 2% National Insurance applies to that slice. The net cost is £20 lower, and the employer's own 15% National Insurance saving is sometimes paid into the pension on top.

Tax relief on your own contributions is limited to 100% of your UK earnings for the year (or £3,600 gross if you earn less), and everything paid in counts towards the annual allowance of £60,000: your contributions, your employer's, and the tax relief itself. Breach it and the annual allowance charge claws the relief back by adding the excess to your taxable income and taxing it at your marginal rate. Unused allowance from the previous three tax years can be carried forward to shelter a large one-off payment, which is what makes a bonus year or a business sale manageable rather than punitive.

Two variants cut that £60,000 down. The tapered annual allowance applies when threshold income is over £200,000 and adjusted income is over £260,000, removing £1 of allowance for every £2 of adjusted income above £260,000, down to a floor of £10,000, and adjusted income counts employer contributions alongside your own earnings. The money purchase annual allowance bites once you flexibly access a defined contribution pension, capping money purchase contributions at £10,000 a year from that point on. Both are easy to trip over without noticing, so it is worth checking which applies before a large payment leaves your account.

Income between £100,000 and £125,140 carries an effective marginal rate of 60%, because 40% income tax is joined by the Personal Allowance taper worth another 20 points. Pension contributions reduce adjusted net income, and bringing it back under £100,000 restores the allowance in full. Paying £25,140 gross (£20,112 net) into a pension from income of £125,140 does precisely that: the ordinary 40% relief is worth £10,056 and the restored £12,570 Personal Allowance saves another £5,028 of income tax, so total relief is £15,084, an effective rate of 60% on the contribution. Little else in UK personal finance comes close.