Salary Sacrifice Calculator

What salary sacrifice is

Salary sacrifice, sometimes called salary exchange, is a contractual change. You agree with your employer to give up part of your gross pay, and in return they provide a non-cash benefit — most commonly a pension contribution, but also cycle to work, an electric car lease, or childcare vouchers on legacy schemes.

The word that does the work is contractual. Your salary genuinely falls. It is not a deduction taken from pay you have already earned; it is pay you never earn in the first place. That single fact is where every advantage and every drawback comes from.

Because the pay was never earned, it is never charged to income tax, never charged to National Insurance — yours or your employer’s — and never counted for student loan repayments. And because your salary genuinely fell, it is also the lower figure a mortgage lender sees, the lower figure statutory maternity pay is calculated from, and the lower figure that matters for some earnings-related benefits.

How the National Insurance saving works

This is the part that distinguishes salary sacrifice from every other way of paying into a pension, and it is the reason the arrangement exists at all.

With a relief-at-source pension — the default for most auto-enrolment schemes — you pay from net pay and the provider reclaims basic rate tax. Higher and additional rate taxpayers claim the rest through self assessment. You get income tax relief, but National Insurance was charged on the full salary before any of it happened, and your student loan repayment was calculated on the full salary too.

With salary sacrifice, the gross figure itself is lower. Income tax, National Insurance and student loan repayments are all calculated afterwards, on a smaller number.

The 60p row is not a typo. Between £100,000 and £125,140 the personal allowance is withdrawn at £1 for every £2 earned, so each pound of income is taxed at 40% and drags 50p of allowance into the 40% band with it. Sacrificing income in that range therefore saves at an effective 60%, and reducing income back below £100,000 restores the allowance entirely. It is the single most efficient use of salary sacrifice in the UK tax system.

The employer’s 15%, and why you should ask about it

Employers pay 15% National Insurance on earnings above the £5,000 secondary threshold. When you sacrifice £6,000, your employer’s bill falls by £900. That money is theirs, not yours — but a great many schemes pass some or all of it into the employee’s pension, and a great many employees have never asked. The toggle in the calculator shows both outcomes, because the difference over a career is not small.

A worked example you can check

£60,000 salary in England, sacrificing 10% into a pension, with a Plan 2 student loan.

Every line above is reproducible on a calculator from published HMRC rates. That is the point: a saving figure you cannot check is a figure you have to take on trust.

Salary sacrifice in Scotland

Scottish taxpayers have six income tax bands rather than three, so the saving from each sacrificed pound depends on which band you are sacrificing out of. National Insurance is set UK-wide, so the 8% and 2% rates are identical either side of the border.

Two quirks are worth knowing. The Scottish higher rate of 42% begins at £31,093 of taxable income — well below the point at which National Insurance drops from 8% to 2% at £50,270 of salary. That overlap means Scottish higher rate taxpayers between roughly £43,700 and £50,270 of salary save 50p in the pound before any student loan is counted, which is the highest ordinary saving rate available anywhere in the UK outside the £100,000 taper. And the advanced rate saves slightly less per pound than the higher rate, because National Insurance has dropped to 2% by the time you reach it.

Select Scotland in the calculator and the band-by-band working shows exactly which of these your sacrifice is coming out of.

The HMRC position

Salary sacrifice is not a loophole and HMRC has published guidance on it for decades, currently in the Employment Income Manual at EIM42750. The rules that matter in practice:

• It must be a genuine contractual variation, agreed in writing before the pay it affects is earned. You cannot retrospectively relabel salary you have already earned.
• It cannot take your pay below the National Minimum Wage. Employers are obliged to refuse arrangements that would, and this is the most common reason a request is declined.
• Most arrangements are fixed for a period — typically twelve months for cycle to work, the lease term for a car, and until changed for a pension. Lifestyle events such as redundancy, pregnancy or a significant pay change usually allow an exit.
• Since April 2017, most benefits lost their tax advantage under the optional remuneration arrangements rules. Pensions, cycle to work, ultra-low-emission cars and employer-provided childcare were specifically protected, which is why those four are what remains.

The pension annual allowance still applies. Contributions from all sources, including employer contributions, are tested against it, and exceeding it creates a tax charge. If you are sacrificing a large amount or have a high income, that is a question for a qualified adviser rather than a calculator.

When salary sacrifice is not worth doing

The arithmetic is almost always favourable, which is exactly why the non-arithmetic reasons deserve attention. A lower contractual salary is a real thing with real consequences.

Mortgage affordability

Lenders assess what you earn, and after a sacrifice you earn less. Someone on £60,000 sacrificing 10% is a £54,000 applicant, and at a four-and-a-half-times multiple that is roughly £27,000 less borrowing. Some lenders will add the sacrifice back for pension contributions; many will not. If you are applying for a mortgage within the next year, it is worth asking a broker before increasing a sacrifice, and worth knowing that most schemes let you pause. Our mortgage affordability calculator shows the difference on your own figures.

Statutory pay

Statutory Maternity, Paternity, Adoption and Shared Parental Pay all begin with 90% of average weekly earnings, calculated on your post-sacrifice salary. A sacrifice running through the qualifying period reduces the first six weeks of maternity pay directly. Statutory Sick Pay and redundancy pay are also earnings-based. If a baby is a realistic possibility in the next year, pausing a sacrifice beforehand is a legitimate thing to do, and our guide to parental leave sets out where the income falls.

Earnings-related benefits and the minimum wage

Contribution-based benefits and some means-tested calculations use earnings, and a reduced salary can change entitlement. Separately, sacrifice cannot take pay below the National Minimum Wage — which in practice constrains lower earners far more than the tax rules do.

When the money is better used elsewhere

A pension is inaccessible until at least 55, rising to 57 from 2028. If you have expensive short-term debt, clearing a card at 22% beats a 28% one-off tax saving on money you cannot touch for decades. If you have no emergency fund, that comes first — our emergency fund calculator sizes it. And if you are close to the annual allowance, an additional sacrifice can create a tax charge rather than a saving.

The other schemes: cycle to work and electric cars

Pensions are the largest use of salary sacrifice, but two others survived the 2017 rule change with their advantages intact.

Cycle to work lets you take a bike and accessories through sacrifice, typically over twelve or eighteen months, saving at the same 28% to 51% your marginal position gives. The old £1,000 cap applies only to employers running the scheme under a group consumer credit licence; many providers now offer far higher limits covering electric bikes. At the end of the hire period you usually buy the bike for a small residual value. A basic rate taxpayer taking a £1,000 bike pays an effective £720.

Electric car schemes are the most valuable remaining benefit for higher earners, because ultra-low-emission vehicles were exempted from the optional remuneration rules. You sacrifice salary for a lease, saving income tax and National Insurance on the whole amount, and pay benefit-in-kind tax at the low rate applying to electric vehicles instead. The saving against a personal lease is substantial, though the commitment runs for the full lease term and leaving your employer mid-term usually has consequences worth reading before signing.

Both work through the same mechanism the calculator above models: your gross pay falls, and tax, National Insurance and student loan repayments are all calculated on the lower figure. Put the annual cost of the bike or the lease into the sacrifice field to see the saving on your own numbers.

Frequently asked questions

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