Backdating pension tax relief: years, deadlines and evidence

You can normally claim additional relief for eligible relief-at-source pension contributions within four years of the end of the relevant tax year. Backdating means claiming relief on money you already contributed; it does not mean making a new pension payment count for an old tax year.

Start with three checks

• Did you personally contribute through relief at source? Salary sacrifice is an employer contribution; net-pay deductions already reduce taxable pay.
• Did you pay tax above the basic rate on the relevant part of your income that year? Scottish rates differ.
• Has the extra relief already been given through a return or tax-code adjustment?

NEST, The People's Pension and many personal pensions use relief at source, but an employer can use salary sacrifice. Confirm the actual arrangement rather than relying only on the provider name.

Which years are still open?

The four most recent completed tax years are 2022/23, 2023/24, 2024/25, 2025/26. Check your eligibility separately for each year.

• 2022/23: claim by 5 April 2027
• 2023/24: claim by 5 April 2028
• 2024/25: claim by 5 April 2029
• 2025/26: claim by 5 April 2030

The oldest open year is 2022/23, with a normal claim deadline of 5 April 2027. Allow time to gather evidence and for HMRC to receive a postal claim. The current tax year, 2026/27, is handled through current-year relief or Self Assessment rather than this backdated pack.

A worked example

Suppose you paid £2,400 personally into a relief-at-source pension and the provider added £600 basic-rate relief. Your gross contribution is £3,000. If the whole £3,000 qualifies for relief at 40%, the extra relief is £600. It is not another 40% on top of the provider's relief.

This assumes enough income was taxed at 40%, no relief has already been claimed, and no other restrictions apply. A contribution straddling tax bands gets different relief on each part. Scottish rates, other income and the personal-allowance taper can change the calculation. Use actual figures for each year; never multiply one payslip by four years without checking your records.

Changed jobs or lost your old payslips?

Ask each pension provider for a contribution statement covering the relevant tax years. Use P60s and tax records to establish income and tax, and separate your personal payments from employer payments and provider tax relief. Combine the relevant personal contributions when calculating that year's position; do not calculate separate higher-rate bands for each employer.

Choose the right claim route

If you filed a Self Assessment return for the year, claim through the return. An amendment is normally available within 12 months of the statutory filing deadline. Older returns may require a written overpayment relief claim, with a signed declaration and the relevant time limit; the four-year claim window is not a four-year return-amendment window.

If you do not file Self Assessment for the year, use HMRC's free online service or its postal route. Claims need supporting evidence. A pension-provider statement or contribution certificate is useful because it distinguishes your payments from employer contributions and tax relief. Check HMRC's requirements before relying on a payslip. Do not rely on a phone call to submit the claim.

For a postal claim, use Pay As You Earn and Self Assessment, HM Revenue and Customs, BX9 1AS. Keep a copy of your signed claim and evidence. Online response targets are not guaranteed payment dates.

Sources and next step

Check HMRC's pension tax relief guidance and HMRC's claim service and evidence requirements.

Check your eligibility and estimate with our free calculator. No email is required. You can claim directly from HMRC for free. If you want help preparing the paperwork, our optional £99 pack includes a personalised letter, year-by-year calculation and evidence checklist. You provide your records, then sign and submit the pack yourself. HMRC decides the final relief.