Useful for payslip checks
Use it to estimate why a pension line changes take-home pay by less than the amount going into the pension.
UK Pension Contribution Calculator
Estimate pension cost, tax relief and take-home impact.
2026/27 tax and pension assumptions
Reviewed 20 July 2026. The calculator uses bundled 2026/27 Income Tax and employee National Insurance assumptions to compare net pay, relief at source and salary sacrifice. It does not test scheme-specific qualifying earnings, annual allowance or employer matching rules.
Check current Income Tax rates and check your scheme booklet or pension provider for the contribution basis that applies to you.
How this pension calculator works
It compares your pay with and without the selected pension contribution method. Net pay arrangements reduce taxable pay before Income Tax. Relief at source assumes the pension provider claims basic-rate relief and adds it to the pot. Salary sacrifice reduces contractual cash pay before estimated PAYE and employee National Insurance.
Estimate only: use the result as a planning estimate when you want to understand the shape of a pension deduction before comparing it with a payslip. The calculator separates employee cash cost, tax saving, National Insurance saving, employer contribution and total paid into the pension so the figures are easier to check than a single take-home number.
Important limits
This does not test annual allowance, tapered allowance, employer scheme rules, tax code notices or qualifying earnings rules.
Source notes
Tax relief treatment is based on GOV.UK pension tax relief guidance, checked June 2026. Tax rates use the bundled Clear Calculators rates file.
Common pension contribution checks
If your employer uses relief at source, the payslip deduction is usually the amount you pay from take-home pay, while the pension provider adds basic-rate tax relief. If your employer uses a net pay arrangement, the deduction normally reduces taxable pay before Income Tax, but it does not reduce employee National Insurance. Salary sacrifice is different again because the employee gives up contractual cash pay and the employer pays the sacrificed amount into the pension.
Those differences matter when comparing two jobs, checking a pension increase, or deciding why a payslip deduction does not match a simple percentage of salary. The estimate cannot know your tax code history, scheme-specific qualifying earnings, payroll rounding, bonus timing or annual allowance position, so the result should be checked against your employer, pension provider or HMRC guidance before relying on it.
Choosing the right pension method
The most important input is the pension method. If the payslip shows taxable pay after the pension deduction, it may be a net pay arrangement. If the deduction is taken from net pay and the pension provider adds tax relief, it may be relief at source. If contractual salary is reduced before tax and NI, it may be salary sacrifice.
When unsure, check the scheme booklet, payroll portal or pension provider wording. Choosing the wrong method can make the take-home estimate look materially different, even when the contribution percentage is correct.
Employer contribution
Employer contributions increase the amount going into the pension but do not usually reduce employee take-home pay.
Qualifying earnings
Some schemes calculate contributions on qualifying earnings rather than full salary. This calculator uses the pay amount you enter, so scheme-specific bases need separate checking.
Annual allowance
The calculator does not test annual allowance, tapered allowance or carry-forward rules. Use official guidance or professional advice for those checks.
Pension deductions and student loan checks
Pension method matters when you compare take-home pay or student loan repayments. A salary sacrifice pension can reduce contractual cash pay before estimated tax and NI. A net pay pension normally reduces taxable pay but not employee National Insurance. Relief at source is usually taken after tax, with basic-rate relief added by the provider.
If you are checking a payslip, compare the pension method here with the salary sacrifice calculator, student loan repayment calculator and payslip checker. The same contribution percentage can produce a different result depending on which method payroll uses.