Whether pension reduces taxable pay depends on the pension method: relief at source, net pay or salary sacrifice.
It depends on the pension method. In 2026/27, net pay and salary sacrifice pension arrangements can reduce taxable pay before Income Tax is calculated, while relief at source normally works after tax with basic-rate relief added by the pension provider.
| Tax/source year | 2026/27 |
|---|---|
| Region | England/Wales/Northern Ireland |
| Tax code basis | 1257L where the page uses PAYE defaults |
| Pension basis | No pension deduction unless this example says otherwise |
| Student loan basis | No student loan unless selected in this example |
| Calculator setting | The answer is more useful when matched to the same tax year, region, tax code, pension and loan settings used in the calculator. |
|---|---|
| Records to compare | Payslips, HMRC records, student-loan notices and pension scheme documents can explain differences. |
| Tax code | HMRC tax-code changes, K codes, BR/D codes, or emergency markers can change PAYE deductions. |
|---|---|
| Cumulative basis | Week 1, Month 1 or non-cumulative payroll can differ from a smooth annual calculator estimate. |
| Pension method | Relief at source, net pay and salary sacrifice can affect taxable pay and take-home pay differently. |
| Payroll timing | Bonus, overtime, arrears, refunds, cut-off dates and corrections can all move a single payslip. |
| Open the salary calculator with editable assumptions | calculator next step |
|---|---|
| Review calculation sources and methodology | source context |
| What is not decided here | PayBreakdown does not decide payroll correctness, lender approval, benefit entitlement or employer compliance, and does not give regulated financial, mortgage, debt, tax, payroll or legal advice. |
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A payslip or pension document may use different labels, so the method matters more than the contribution percentage alone.
Two employees with the same salary and contribution percentage can have different take-home results if their pension methods differ.
This is educational guidance on how UK pay and tax work. It does not decide payroll correctness, HMRC treatment, lender approval, benefit entitlement or employment rights, and it is not regulated financial advice. Where a figure matters, check it against your payslip, your HMRC account, or the official guidance linked above.
PayBreakdown does not recommend a method. Salary sacrifice can change tax and NI, but employer rules, minimum-wage checks and benefit effects need separate review.
Relief at source usually takes the employee amount from net pay and adds basic-rate relief into the pension. It may not reduce the payslip taxable pay in the same way as net pay or salary sacrifice.
Use the method shown by your employer or pension provider where possible. If unsure, model several methods as estimates rather than treating one as official.
Last updated 2026-08-27. Checked by Sean Elsmore. Rates last checked against GOV.UK on 2026-08-07. Estimates are for planning and should be checked against official records where the decision matters.