Salary Sacrifice Calculator UK

Salary sacrifice is one of the few genuinely effective, entirely legitimate ways to reduce your tax bill as an employee, yet plenty of people either haven't heard of it or assume it's some kind of loophole. It isn't. It's a formal arrangement recognised by HMRC where you agree to give up part of your gross salary in exchange for a non-cash benefit, most commonly extra pension contributions.

This calculator compares your take-home pay with and without salary sacrifice, using 2026/27 tax year rates. It now lets you choose the benefit type and model how much employer NI saving is passed on, because those details can materially change the result.

Why salary sacrifice saves you money

The saving comes from where the money leaves your pay. A normal personal pension contribution is made from your pay after National Insurance has already been deducted. With salary sacrifice, the contribution comes out of your gross salary before anything is calculated, which means:

• You pay no Income Tax on the sacrificed amount (as with any pension contribution)
• You also pay no employee National Insurance on it, 8% on earnings between £242 and £967 a week, 2% above, which a normal net-pay contribution wouldn't save you
• Your employer saves their employer National Insurance on it too, 15% on earnings above £5,000 a year for 2026/27, and many employers pass some or all of this saving into your pension as well

That employer NI saving is the part people miss. At 15%, it's substantial, and an employer willing to pass it on can boost your pension contribution meaningfully at no cost to themselves.

Worked example

Say you earn £40,000 and sacrifice £200 a month (£2,400 a year) into your pension:

• Your taxable salary drops to £37,600
• You save 20% Income Tax on the £2,400 = £480 a year
• You save 8% employee NI on the £2,400 = £192 a year
• Your take-home pay falls by only around £1,728 a year, despite £2,400 going into your pension
• If your employer passes on their 15% NI saving (£360), your pension receives £2,760 for a take-home cost of £1,728; if they keep the saving, the pension receives £2,400 instead

For higher rate taxpayers the numbers are stronger still, since the Income Tax saving is 40% rather than 20%.

What can be salary sacrificed?

Pensions are the most common and usually the most valuable use, but depending on your employer you may also be offered:

• Cycle to work schemes — a bike and equipment paid for from gross salary
• Electric vehicle leases — EV salary sacrifice schemes have grown rapidly because the Benefit in Kind rate on electric cars remains low, making the overall tax position attractive
• Additional annual leave — buying extra holiday days from gross pay
• Workplace nursery schemes — where available, these remain tax-efficient

The tax treatment varies by benefit. Since 2017, most benefits other than pensions, cycling, ultra-low emission vehicles and childcare have lost their salary sacrifice tax advantages under OpRA. Buying extra annual leave can still work in practice, but it sits outside that benefit-in-kind framework rather than being a named OpRA exemption. Check the specifics of anything your employer offers.

The trade-offs to check before you commit

Because salary sacrifice genuinely reduces your contractual gross salary, anything calculated from that salary can be affected:

• Mortgage applications — lenders typically assess affordability on your post-sacrifice salary. If you're applying for a mortgage soon, a large sacrifice could reduce what you can borrow.
• Statutory payments — Statutory Maternity Pay, Statutory Paternity Pay and Statutory Sick Pay are based on your average earnings. Sacrificing salary reduces those averages. If you're planning parental leave, time the arrangement carefully.
• Life cover and income protection — employer schemes that pay out multiples of salary may use your reduced figure.
• National Minimum Wage floor — your post-sacrifice salary can't fall below the National Minimum Wage for your hours. Employers must block sacrifices that would breach this.
• State benefits and pension credits — reducing earnings below certain thresholds can affect entitlement to some contributory benefits.

Pension annual allowance

Salary-sacrificed pension contributions count towards your pension annual allowance, £60,000 for most people, alongside all other contributions. High earners may have a tapered allowance. If you're contributing large amounts, check your position before committing.

This is general guidance, not financial advice. Pension decisions are long-term and personal, consider speaking to a regulated financial adviser, or check MoneyHelper for free impartial guidance.