How Higher Rate Taxpayers Can Reclaim 40% Pension Tax Relief

How Does Pension Tax Relief Work in the UK?

Pension tax relief is the government’s way of encouraging retirement saving. When you contribute to a pension, the money is treated as though it was never taxed — effectively reversing the income tax you paid on that portion of your earnings.

For basic rate taxpayers (earning £12,571–£50,270), the process is simple. You contribute £800 to your SIPP, and your pension provider claims £200 from HMRC on your behalf. Your pension receives £1,000 in total. That £200 top-up represents the 20% basic rate tax you paid on that income. No further action is needed.

For higher rate taxpayers (earning £50,271–£125,140), you are entitled to 40% relief — but only 20% is added automatically. The remaining 20% must be claimed separately. On a £1,000 gross pension contribution, the breakdown looks like this:

The effective cost is just £600 for a £1,000 pension contribution — a 40% discount. But only if you claim the second 20%. If you don’t, you’re paying £800 for a £1,000 contribution and leaving £200 on the table.

How Do You Claim the Extra 20% Relief?

There are two main routes to claim the additional relief you are owed:

1. Self-Assessment Tax Return

This is the most common method. If you already file a tax return (because you are self-employed, have rental income, or earn over £150,000), you simply declare your pension contributions on the return. HMRC calculates the additional relief and either reduces your tax bill, issues a refund, or adjusts your tax code for the following year.

On the self-assessment form, pension contributions go in Box 1 of the “Tax reliefs” section. Enter the gross amount (including the basic rate top-up). For example, if you paid £8,000 from your bank account, your gross contribution is £10,000 — enter £10,000.

2. Contact HMRC Directly

If you are a PAYE employee and do not normally complete a self-assessment return, you can write to HMRC or call them to request the relief. You will need to provide:

• Your National Insurance number
• The name of your pension provider
• The amount you contributed during the tax year
• The tax year the contributions relate to

HMRC will typically adjust your PAYE tax code so that you receive the relief spread across the following tax year’s pay packets. Some people prefer to register for self-assessment instead, as the refund is usually faster and more transparent.

You can check the latest guidance on gov.uk/tax-on-your-private-pension.

How Much Could You Be Missing Out On?

The amount of unclaimed relief depends on how much you contribute to your SIPP. Here is the extra relief available at different contribution levels for a higher rate taxpayer:

A higher rate taxpayer contributing £800/month to a SIPP and not claiming the extra relief is leaving £2,400 per year with HMRC. Over a 10-year FIRE accumulation phase, that is £24,000 in unclaimed tax relief — money that could itself be invested towards financial independence.

Many FIRE investors reinvest the refund straight into their Stocks and Shares ISA. This creates a powerful loop: pension contributions generate a tax refund, the refund fills the ISA, and both wrappers compound tax-free.

Salary Sacrifice vs Personal SIPP Contributions: Which Is Better?

If your employer offers salary sacrifice, the higher rate relief question becomes irrelevant — because you never pay the tax in the first place. With salary sacrifice, your gross salary is reduced before tax and National Insurance are calculated, and the sacrificed amount goes directly into your workplace pension.

The advantages of salary sacrifice over personal SIPP contributions:

• Full relief at source — no need to file a claim or wait for a refund
• National Insurance savings — you save 8% employee NI on the sacrificed amount (your employer saves 13.8% too, and some pass this on)
• Immediate effect — relief is applied in each pay packet, not retrospectively
• No risk of forgetting to claim — the most common reason higher rate relief goes unclaimed

For higher rate taxpayers, salary sacrifice is almost always the better option if it is available. The NI saving alone adds roughly 8% to the value of every pension contribution, on top of the income tax relief. Read our full guide on salary sacrifice pensions for FIRE for the detailed breakdown.

What About Additional Rate Taxpayers (45%)?

If you earn above £125,140, the same principle applies with even larger numbers. Pension contributions that fall within the additional rate band attract 45% relief. Only 20% is added automatically — the remaining 25% must be claimed through self-assessment.

There is an extra wrinkle for earners between £100,000 and £125,140: the Personal Allowance taper. In this band, you lose £1 of your £12,570 Personal Allowance for every £2 you earn above £100,000. This creates an effective marginal tax rate of 60% on income between £100,000 and £125,140.

Pension contributions can bring your adjusted net income back below £100,000, restoring your full Personal Allowance. If you earn £110,000 and contribute £10,000 to your pension, your adjusted net income drops to £100,000, restoring the full £12,570 allowance. The effective tax relief on that contribution is 60% — making pension contributions in this income band extraordinarily efficient.

Check the latest rates and thresholds on gov.uk/income-tax-rates.

Common Mistakes to Avoid

• Not claiming at all — HMRC estimates that hundreds of millions of pounds in higher rate relief go unclaimed each year. If you contribute to a SIPP and pay 40% tax, you almost certainly need to file a claim.
• Entering the net amount instead of gross — on your self-assessment return, you must enter the gross contribution (including the 20% basic rate top-up), not the amount that left your bank account.
• Missing the deadline — you have four years from the end of the tax year to claim relief. For 2025/26, that means claiming by 5 April 2030. But the sooner you claim, the sooner you can reinvest the refund.
• Exceeding the annual allowance — the pension annual allowance is £60,000 for 2025/26 (including employer contributions). Contributions above this are taxed via the annual allowance charge, which claws back the relief.
• Forgetting employer contributions count — if your employer contributes £15,000 and you contribute £45,000 personally, you have hit the £60,000 cap. Any additional contributions would not receive tax relief and would trigger a charge.

Frequently Asked Questions

Work Out Your Own Numbers

Use our calculator to see how pension contributions compare with ISA investing for your tax bracket:

• ISA vs SIPP Calculator — compare the after-tax value of ISA and SIPP contributions at basic, higher, and additional rates