Pension Tax Relief Calculator — Higher-Rate Top-Up
Personal pensions get 20% basic-rate relief added automatically. If you pay tax at 40%, 45% (or Scottish higher rates), the rest of your relief is NOT automatic — you claim it from HMRC, and can backclaim up to four years.
Enter what you paid in (the net amount) and your income; the calculator shows what HMRC added and what is still claimable.
First: which kind of pension scheme do you have?
- Relief at source — personal pensions, SIPPs, stakeholder pensions and many auto-enrolment schemes (including NEST and now:pensions). 20% is added for you; higher-rate taxpayers claim the rest.
- Net pay arrangement — most large employer schemes. Contributions come out before tax, so every taxpayer gets full relief automatically on the payslip. Nothing to claim.
- Salary sacrifice — pay is swapped for employer contributions; relief comes through lower gross pay. Again, nothing to claim.
- Not sure? Your scheme's annual statement or HR can tell you in one question: 'Is my pension relief at source?'
The higher-rate arithmetic
You pay in £80; the provider claims £20 from HMRC and your pot holds £100. A 40% taxpayer is entitled to £40 total relief — so £20 is still waiting at HMRC. A 45% taxpayer waits on £25. Scottish taxpayers on 42% claim £22, on 47% claim £27, and on 48% claim £28 per £100. The claim returns the money as a reduced tax bill (or a refund for backdated years), and claiming raises your basic-rate band so it repeats in later years if you keep contributing.
Backdating up to four years
The four-year rule applies here too, and it is where the meaningful money sits. A 40% taxpayer contributing £300 a month net into a SIPP who has never claimed higher-rate relief is owed £900 per year — about £3,600 across four years. Claims go through Self Assessment if you file one, or a simple letter to HMRC with your contribution statements if you don't. Watch the £60,000 annual allowance (across you and your employer combined) and the taper above £260,000 of adjusted income.
What this estimate can't tell you
- Assumes a relief-at-source scheme — net pay arrangements already give full relief.
- The £60,000 annual allowance (including employer money) is flagged but not modelled in full.
- Salary sacrifice works differently and is not covered.
The free HMRC route
Everything this calculator estimates can be claimed directly from HMRC at no cost — usually online in a few minutes or via a short form. Refund companies charge a percentage of money that is already yours. We never handle claims and are not affiliated with HMRC.