Salary Sacrifice Calculator

Priya, 38, product manager in Manchester

Earns £110,000 and has just noticed that her last pay rise felt strangely small. She sits squarely inside the Personal Allowance taper and wants out of it.

£110,000 · England, Wales & NI · sacrifice £10,000 · employer passes back 100% of its NI saving · no student loan

Sacrificing exactly enough to land on £100,000 restores her whole Personal Allowance in one move. Every £1 of take-home pay she gives up buys more than £3 of pension, which no other contribution route in the UK can match. The window is only £25,140 wide, so it closes for her the moment she is paid more than £125,140.

Tom, 29, support engineer on £35,000

Wondering whether the standard 5% sacrifice his employer offers is worth the drop in monthly pay. He has a Plan 2 student loan from a 2016 degree.

£35,000 · England, Wales & NI · sacrifice £1,750 (5%) · no passback · Plan 2

Basic-rate earners are told sacrifice saves them 28% — 20% Income Tax plus 8% National Insurance. With a Plan 2 loan it is materially better than that, because the 9% repayment is assessed on the reduced figure payroll reports. That student loan effect is the single most commonly omitted line in competing calculators, and it costs Tom nothing to collect.

Sarah, 34, on £65,000 with two children

Losing part of her Child Benefit to the High Income Child Benefit Charge and paying it back through Self Assessment every January.

£65,000 · England, Wales & NI · sacrifice £5,000 · two children · no passback

Between £60,000 and £80,000 with children, the Child Benefit clawback stacks on top of the 40% band, so sacrifice is worth considerably more than the headline 42%. Landing exactly on £60,000 wipes out the charge entirely and removes the Self Assessment return that came with it.

Dan, 26, warehouse team leader on £25,000

Asked payroll to start a 5% sacrifice and was told no. He wants to know whether that was his employer being awkward.

£25,000 · 37.5 hours a week · aged 21 or over · requested sacrifice £1,250 (5%)

It was not. A £1,250 sacrifice would drop his cash pay to £12.18 an hour, below the £12.71 National Living Wage, and the employer would be breaking the law rather than bending a policy. The calculator caps him at the legal maximum instead of showing a figure he cannot have — which is why many employers exclude lower-paid staff from sacrifice schemes altogether.

Alex, 51, director on £280,000

Sacrificing heavily into the pension and assuming that the reduced figure on the payslip is what HMRC measures the annual allowance taper against.

£280,000 · England, Wales & NI · sacrifice £30,000 · no separate employer contribution

This is the assumption that produces real annual allowance charges. Sacrifice entered into after 8 July 2015 is added back into threshold income, so his figure is £280,000 rather than the £250,000 his payslip shows, and his allowance tapers to £50,000. Adding an employer contribution on top pushes adjusted income higher still and tapers the allowance further.

What is the 60% tax trap, and does salary sacrifice get you out of it?

Between £100,000 and £125,140 the Personal Allowance is withdrawn by £1 for every £2 of income, so each extra pound is taxed at 40% while simultaneously dragging 50p of previously tax-free income into the 40% band. The measured marginal rate is 60% in England, Wales and Northern Ireland, and 67.5% in Scotland where the advanced rate is 45%. It appears in no published HMRC rate table. Salary sacrifice is the standard escape: because sacrificed pay is never earnings, contributing enough to bring adjusted income back to £100,000 restores the whole allowance. A £110,000 earner sacrificing £10,000 gives up £3,800 of take-home pay for a £10,000 pension contribution — 62% of it funded by tax and National Insurance that would otherwise have gone to HMRC.

How much do I actually save with salary sacrifice?

It depends entirely on which band the sacrificed pay came out of. A basic-rate taxpayer saves 28% — 20% Income Tax plus 8% employee National Insurance. A higher-rate taxpayer saves 42%, because National Insurance drops to 2% above £50,270. Inside the £100,000 to £125,140 allowance taper the figure is 62%, and 69.5% for a Scottish taxpayer. A student loan adds a further 9%, or 6% on a Postgraduate Loan. On top of all that, your employer saves 15% and may pass some of it back. The number that matters most is the cost per £1 of pension, which this calculator shows directly.

Is salary sacrifice better than a normal pension contribution?

In almost every case where an employer offers it, yes. Sacrifice is the only one of the three arrangements that avoids employee National Insurance, and the only one that reduces your student loan deduction. Relief at source and net pay arrangements both give full Income Tax relief eventually, but neither touches National Insurance, and relief at source makes higher-rate taxpayers reclaim the balance through Self Assessment. The exceptions are worth knowing: earners near the minimum wage cannot use sacrifice at all, anyone applying for a mortgage soon may not want to, and a low earner below the Personal Allowance can do better under relief at source because the provider adds 20% they never paid.

Does salary sacrifice affect my mortgage application?

Yes, and it is the most common regret people report. Lenders assess affordability on the gross pay shown on your payslip, and after sacrifice that is the reduced figure — a 15% sacrifice on £60,000 presents you as a £51,000 earner. At a typical 4.5 times income multiple that is roughly £40,000 less borrowing capacity. Some lenders will add sacrificed pension back if you ask and can evidence it with your scheme documentation, but many will not, and it is rarely something a broker can argue successfully after a decision has been made. Most employers allow you to suspend sacrifice temporarily; do it at least three or four months before you apply, because lenders normally want to see three consecutive payslips at the higher figure. The same applies when you remortgage or port an existing loan. None of this touches your credit file — it is an affordability calculation, not a creditworthiness one.

What is the £2,000 salary sacrifice cap from April 2029?

From 6 April 2029, only the first £2,000 of pension contributions made through salary sacrifice each tax year keeps its National Insurance exemption; above that, salary given up is treated as earnings for both employee and employer Class 1 National Insurance, though Income Tax relief is explicitly unchanged. The section above sets out HMRC’s own estimates of how many people are affected and what it costs them, and the calculator shows the future National Insurance on your own sacrifice as a separate forward-looking figure.

Can my employer refuse salary sacrifice, or take my pay below minimum wage?

An employer is under no obligation to offer salary sacrifice, and it cannot legally reduce your cash pay below the National Minimum Wage — £12.71 an hour for workers aged 21 and over from 1 April 2026, £10.85 for 18 to 20 year olds and £8.00 for under-18s and first-year apprentices. HMRC requires employers to cap sacrifice so the floor is always maintained, which is why many schemes exclude lower-paid staff entirely. Sacrifice also requires a genuine variation of your employment contract, agreed before the pay is earned. A payroll instruction after the fact is not salary sacrifice and does not get the tax treatment.

Does salary sacrifice reduce my student loan repayments?

Yes, and this is one of the strongest arguments for it. Student loan repayments are 9% of earnings above your plan threshold — £26,900 on Plan 1, £29,385 on Plan 2, £33,795 on Plan 4 and £25,000 on Plan 5 — or 6% above £21,000 for a Postgraduate Loan. They are assessed on the figure payroll reports, which after sacrifice is the reduced one. Someone on £35,000 sacrificing £1,750 pays £157.50 a year less, and that stacks on top of the Income Tax and National Insurance saved rather than replacing any of it. If you hold both an undergraduate and a Postgraduate Loan, payroll deducts for each and sacrifice reduces both. Relief-at-source and net pay contributions have no effect at all on the deduction, because they happen after payroll has already measured your earnings — which is the cleanest single argument for choosing sacrifice wherever it is offered.

Does salary sacrifice affect my State Pension or maternity pay?

Your State Pension record is safe as long as reported earnings stay above the Lower Earnings Limit of £6,708 a year, which nearly every full-time worker clears comfortably even after a substantial sacrifice. Statutory Maternity Pay is the real risk. The first six weeks pay 90% of average weekly earnings, measured on post-sacrifice pay over a reference period that ends around the 25th week of pregnancy, so heavy sacrifice through that window permanently reduces the payment — and the reduction is not recoverable afterwards. If you are planning a pregnancy, pausing sacrifice before the reference period begins is worth far more than the tax it costs.

What is employer NI passback and should I ask for it?

When you sacrifice salary, your employer stops paying its own 15% secondary Class 1 National Insurance on that money — £1,500 on a £10,000 sacrifice. Some employers rebate part or all of that saving into your pension. It is entirely discretionary, frequently unadvertised, and rarely mentioned in scheme literature, so plenty of people are entitled to it without knowing. Ask HR directly whether the scheme passes back employer National Insurance and at what percentage; if it does not, it is a reasonable thing to raise, because the saving exists whether or not it is shared. One modelling point matters if you are checking the arithmetic yourself: what comes back is an employer contribution, not sacrificed salary, so it generates no further National Insurance saving of its own. Looping saving into contribution into saving inflates the pension figure, and it is a common error in home-made spreadsheets. This calculator defaults passback to zero for exactly that reason.

How much can I sacrifice before I hit the annual allowance?

The annual allowance is £60,000 of total pension input — your sacrifice, your employer contribution and any National Insurance passback, added together. Above £200,000 of threshold income and £260,000 of adjusted income it tapers by £1 for every £2 of adjusted income over £260,000, down to a floor of £10,000. The trap is that salary sacrifice does not reduce threshold income for arrangements made after 8 July 2015; the sacrificed amount is added straight back. Unused allowance from the previous three tax years can usually be carried forward, which often resolves an apparent breach.

Can salary sacrifice help me keep Child Benefit or free childcare?

Yes, and it is often worth more than the Income Tax saving that gets all the attention. The High Income Child Benefit Charge claws back 1% of your Child Benefit for every £200 of adjusted net income above £60,000, reaching 100% at £80,000. Child Benefit is £27.05 a week for the eldest or only child and £17.90 for each additional child, so a two-child household has £2,337.40 a year at stake. Separately, free childcare hours and Tax-Free Childcare disappear entirely at £100,000, a cliff edge rather than a taper. Because pension contributions reduce adjusted net income, sacrificing back below the relevant line can be worth thousands, and the calculator prices both effects into the net pay you give up.