Pension Tax Relief Calculator UK
This pension tax relief calculator shows you how much free money the government adds to your pension contributions and what each pound you save actually costs you after tax relief. Pension tax relief is one of the most valuable tax benefits available to UK workers, yet many people do not fully understand how it works or fail to claim the full amount. Enter your annual salary and monthly pension contribution to see the gross amount going into your pension, the tax relief you receive and the real cost to you. Basic rate taxpayers get 20% added automatically, while higher and additional rate taxpayers can claim an extra 20% or 25% through self-assessment. The tool uses 2025/26 rates to give you an accurate, up-to-date result.
Understanding Pension Tax Relief in the UK
Pension tax relief works by refunding the income tax you paid on the money you contribute. If you pay into a personal pension or workplace scheme using the relief at source method, your provider claims 20% basic rate tax back from HMRC and adds it to your pot automatically. This means a £80 net contribution becomes £100 in your pension. Higher rate taxpayers can claim an additional 20% through their self-assessment tax return, and additional rate taxpayers can claim 25% extra. Salary sacrifice pensions work differently: your employer makes the contribution before tax, so you get full relief immediately and also save National Insurance. The annual allowance for 2025/26 is £60,000, or 100% of your earnings if lower.
Annual Allowance and Carry Forward Rules
The annual allowance caps the total pension contributions that benefit from tax relief in any tax year at £60,000. If you exceed this, the excess is added to your income and taxed at your marginal rate. However, you can carry forward unused allowance from the previous three tax years, provided you were a member of a registered pension scheme in those years. The lifetime allowance was abolished from April 2024, so there is no longer a cap on the total size of your pension pot. Full details on allowances and limits are available on the GOV.UK pension annual allowance page.
Maximising Your Pension Tax Relief
If your employer offers salary sacrifice, this is typically the most tax-efficient way to save into a pension because both you and your employer save National Insurance on the sacrificed amount. For higher rate taxpayers, contributing more to a pension is also one of the simplest ways to reduce your overall tax bill. If your income is between £100,000 and £125,140, pension contributions can restore your personal allowance, effectively giving you 60% tax relief on each pound contributed. Use our take home pay calculator to see how increasing your pension percentage affects your monthly net pay, or check your National Insurance savings from salary sacrifice contributions.
£60,000 for 2025/26, or 100% of qualifying earnings if lower. Excess contributions face a tax charge at your marginal rate.
You agree to a lower salary and your employer pays the difference into your pension. Both you and employer save NI.
If you use relief at source, you must claim the extra 20%/25% through self-assessment. Net pay and salary sacrifice give full relief at source.
Yes, from the previous three tax years. You must have been a member of a registered scheme in those years.
The lifetime allowance was abolished from 6 April 2024. There is no cap on the total size of your pension pot. The annual allowance still applies.
This calculator provides estimates for guidance only. Results use 2025/26 HMRC rates. This is not financial, legal or professional advice. For regulated financial advice, speak to a qualified financial adviser.