Pension contribution guide
UK Pension Tax Relief: Net Pay, Relief at Source and Refunds
Pension tax relief can be delivered in different ways. Correctly identifying the arrangement prevents you from deducting the same contribution twice or entering a net amount where a gross amount is needed.
Updated 21 September 2026 · 8 min read · Educational guidance
Three arrangements that look similar on a payslip
Under net pay, contributions are normally taken before Income Tax is calculated. Relief at source takes a net contribution and the provider claims basic-rate relief. Salary sacrifice changes contractual pay and can also affect National Insurance and other calculations.
Because the mechanisms differ, copying a payslip deduction into a calculator without identifying the arrangement can double count relief.
- ✓ Net pay: tax relief normally applied through payroll
- ✓ Relief at source: provider adds basic-rate relief
- ✓ Salary sacrifice: employer contribution after salary is reduced
Related: Estimate a UK tax refund →
Gross versus net contribution
For relief at source, the gross amount includes the basic-rate top-up. A person paying £800 from take-home pay normally has £1,000 credited to the pension after £200 of basic-rate relief.
Higher or additional-rate taxpayers may need to claim further relief, depending on their circumstances and how HMRC receives the information.
Example: If £800 was paid and the provider added £200, the gross contribution is £1,000.
Related: Self Assessment tax bill →
Limits and adjusted net income
Annual allowance, earnings limits, carry forward and the tapered annual allowance can matter for larger contributions. Those rules are outside a quick refund calculator.
Gross pension contributions can also affect adjusted net income, including the Personal Allowance taper above £100,000. Confirm high-value scenarios with HMRC guidance or professional advice.
Related: Student-loan repayments →
Frequently asked questions
Should I enter the £800 or £1,000 amount?
For a relief-at-source contribution where £800 was paid and £200 added, enter the £1,000 gross amount.
Can I claim the same net-pay contribution again?
Normally the payroll mechanism has already provided relief, so do not deduct it twice.
Does pension relief always create a cash refund?
No. It may reduce tax due, change a tax code or be handled through Self Assessment.
Official sources and important note
General educational information only, not personal tax advice. Confirm your position with HMRC or a qualified UK tax professional.