izharshah.com/tools/salary-sacrifice-calculator · The Parallel Operator · Salary sacrifice calculator · Tax year 2026/27, checked against GOV.UK 20 September 2026
Salary sacrifice: what you actually save
Salary sacrifice does not save you income tax. You would have paid the same either way. What it saves is National Insurance, and student loan if you repay one. Enter your salary and contribution to see the size of that saving and what the contribution costs your monthly take-home.
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Unlock the full comparison: no pension, an ordinary net pay scheme and salary sacrifice side by side, with tax, National Insurance, student loan, take-home and what actually lands in the pension. Save or print it as a PDF to keep.
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Your full breakdown
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| No pension | Ordinary scheme | Sacrifice |
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How this calculator works
The saving is National Insurance, not income tax. Under an ordinary net pay scheme your contribution already comes off before income tax, so your taxable pay is your salary minus the contribution. Under salary sacrifice you formally give up that slice of salary, so your taxable pay is the same figure. Identical taxable pay means identical income tax. What changes is that National Insurance is charged on your reduced salary rather than your original one, and employee National Insurance is 8% between £12,570 and £50,270 and 2% above that. Eight per cent of what you sacrifice is the saving, or two per cent if you earn above the upper limit.
Student loan repayments are charged on the reduced salary too, at 9% above your plan threshold, so a graduate saves that as well. For many people that is the larger half of the answer, which is why the field is on the page.
Your employer saves too, at 15%. Employer National Insurance is charged on what it pays you, so sacrificing cuts its bill as well as yours. Some employers pass part or all of that into your pension and most keep it. It is worth asking payroll, because it is free money to you and costs them nothing they were not already saving. The field above defaults to none, which is the common case.
One thing worth being straight about. Between £100,000 and £125,140 your personal allowance falls by £1 for every £2 earned, so a pension contribution that brings you back under £100,000 recovers it and is unusually valuable. But that is true of any pension contribution, including an ordinary net pay scheme, because both reduce your taxable pay by the same amount. It is not a reason sacrifice beats the alternative. What sacrifice adds on top is only the National Insurance, and above £50,270 that is 2% rather than 8%, so the extra from sacrificing is actually smaller for high earners, not larger.
What it does not cover, and the real trade-offs: sacrifice reduces your contractual pay, which can lower what a mortgage lender will offer, and can reduce statutory maternity pay, redundancy pay and other entitlements calculated from salary. It cannot take your pay below the minimum wage. If your scheme applies a percentage to qualifying earnings rather than your whole salary, enter the pound figure from your payslip instead of a percentage. This page does not cover sacrifice for cars, cycles or childcare, relief-at-source schemes, or the annual and tapered pension allowances. It is guidance, not advice.
Questions people ask about salary sacrifice
Is salary sacrifice worth it for pension contributions?
Usually yes if your employer offers it, because you get the same pension contribution for less take-home. The saving is 8% of what you sacrifice for most earners, or 2% on any part above £50,270. Add another 9% if you repay a student loan, which is often the bigger half.
How much National Insurance do you actually save with salary sacrifice?
Eight per cent of the amount you sacrifice while your pay stays between £12,570 and £50,270, and 2% on any part above £50,270. Sacrificing £3,600 a year on a £45,000 salary saves £288 of National Insurance. Add 9% more if you repay a student loan.
Salary sacrifice or a net pay arrangement, which is better?
Sacrifice, for almost everyone who is offered it. Both give the same income tax relief, because taxable pay ends up identical. Only sacrifice also cuts National Insurance and student loan repayments. The catch is that it lowers your contractual salary, which lenders and some statutory payments look at.
Does salary sacrifice reduce student loan repayments?
Yes. Repayments are 9% of earnings above your plan threshold, and sacrifice reduces the earnings they are worked out on. An ordinary net pay scheme does not, so this is one of the clearest differences between the two. Pick your plan above to see the figure.
Is salary sacrifice for pensions being scrapped?
Changes to pension salary sacrifice have been trailed for the end of the decade, but nothing in this calculator is affected for the 2026/27 tax year. The figures here are the rates in force now. If the rules change, the page changes with them.
Related tools
Guidance only, not pension or tax advice. Your scheme rules and your employer's payroll decide the final figures. Sacrificing salary reduces your contractual pay, which can affect mortgage affordability, statutory maternity pay, redundancy pay and other earnings-linked entitlements.
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