Pension contributions can reduce take-home pay, taxable pay, or National Insurance depending on the pension method used.
A pension contribution usually reduces the amount you receive now, but the tax effect depends on the pension method. Salary sacrifice, net pay, and relief at source can behave differently.
On £35,000 a year with a standard 2026/27 tax code, no pension, no student loan, the figures work out like this. Open a calculator to put your own numbers in.
| 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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The figures on this page are worked from pension and take-home, using the values below. Open the calculator if your example salary differs.
A pension contribution can reduce take-home pay, taxable pay or National Insurance depending on whether the scheme uses relief at source, net pay or salary sacrifice.
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.
The most common reason is a different pension method or employer label. Match relief at source, net pay or salary sacrifice before comparing the numbers.
It can, depending on the pension method and the pay figure used for loan deductions. Use the same method in the calculator before comparing.
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.