Estimate how salary sacrifice-style pension treatment can affect taxable pay, National Insurance, and take-home salary.
Salary sacrifice usually needs a careful deduction explanation. This page shows the moving parts and links into the pension settings where pension treatment can be adjusted.
Sacrifice reduces gross pay, so it cuts Income Tax and National Insurance together. That is what makes it different from a contribution taken after NI.
Of £40,000.00 gross a year: Income Tax £5,086.00, National Insurance £2,034.40, Pension £2,000.00, Take-home £30,879.60.
£2,000 leaves your pay, tax relief adds £0, and £2,000 goes into the pension. That is 5% of the £33,760 of your salary that counts as qualifying earnings.
Saving £130 a month — about 5% of this take-home — becomes £8,603.27 in five years at an example 4%: try the savings calculator.
2026/27 rates, England, Wales and Northern Ireland, no student loan. Open the full calculator to change region, student loan or pension method.
Payslip showing different figures? The payslip checker works out what your pay and tax code should have produced and shows which assumption could explain the gap.
| 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 |
| Gross pay | Employment pay before PAYE deductions and pension or loan settings. |
|---|---|
| Income Tax | Tax estimated from the selected tax-year, region, tax code and taxable-pay assumptions. |
| National Insurance | Employee NI is calculated separately from Income Tax and may not follow the same bands. |
| Pension and loans | Pension method and student-loan plan can change take-home pay and payslip comparisons. |
| Pension contribution | Changing the rate or method can change taxable income, National Insurance and take-home pay. |
|---|---|
| Tax code and region | Scottish Income Tax, Welsh codes, emergency tax or a non-standard tax code can move the result. |
| Student loan plan | A different plan can change deductions because each plan uses its own threshold and repayment rate. |
| Bonus, overtime or second job | Extra pay and payroll timing can make a real payslip differ from the smooth annual estimate. |
| 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. |
| Why is the tax on my payslip higher than expected? | payslip difference |
|---|---|
| What do the main payslip lines mean? | payslip explainer |
| What tax code should I use for modelling? | tax code |
| How much does pension reduce take-home pay? | pension comparison |
| How does this affect a monthly budget? | budget planning |
| 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 salary sacrifice, using the values below. Open the calculator if your example salary or pension method differs.
Each row asks the engine what annual sacrifice would bring adjusted net income down to the point where the Personal Allowance taper begins, then applies that sacrifice and reports the result. The allowance restored is the part of the Personal Allowance the sacrifice buys back; the take-home reduction is what leaves the payslip each month to buy it.
| Salary | Sacrifice to reach the taper start, a year | Sacrifice a month | Personal Allowance restored | Take-home reduction a month |
|---|---|---|---|---|
| £105,000 | £5,000 | £417 | £2,500 | £158 |
| £110,000 | £10,000 | £833 | £5,000 | £317 |
| £115,000 | £15,000 | £1,250 | £7,500 | £475 |
| £120,000 | £20,000 | £1,667 | £10,000 | £633 |
| £125,140 | £25,140 | £2,095 | £12,570 | £796 |
These examples cover pension salary sacrifice for the current tax year. Sacrifice reduces your gross pay, so it lowers Income Tax and National Insurance together, which is what makes it different from a pension contribution taken after NI.
This estimate is worked out on £40,000 annual gross and salary sacrifice pension, no contribution in this example. Change any of those and the take-home figure moves; pension method and student loan plan usually move it most. A payslip can differ from any calculator because payroll works pay period by pay period, so a tax-code change, a bonus, arrears or a refund can land in one month and not the next. See how each deduction is worked out.
Safe current-year pension salary-sacrifice examples by percentage.
Safe current-year pension salary-sacrifice examples by monthly amount.
Use the standalone check before treating a pension salary-sacrifice amount as comfortable.
The same exchange applied to pensions, cars, cycles and childcare, each with its own rules.
It starts from the question on this page, shows the useful salary assumptions, and opens PayBreakdown's calculator so gross pay, take-home pay, tax, National Insurance, pension, student loan, region, and tax-code settings can be adjusted.
Yes. Open the calculator from this page to change salary, hours, pension, student loan, tax year, region, tax code, bonus, and other pay settings.
Scenarios that trip the default-hours minimum-wage guardrail can still be useful inside the calculator, but they are kept out of the public index until the assumptions are safe enough to stand on their own.
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.