Free tool · UK 2026/27 tax bands
UK Salary Sacrifice Calculator
What does salary sacrifice actually save you? Income tax, NI, and total annual saving for pension, electric car, or cycle-to-work — modelled against 2026/27 UK rates with employer NI passback factored in.
How UK salary sacrifice actually works in 2026/27
Salary sacrifice works by routing money to a benefit before it gets taxed. A normal salary of £55,000 incurs income tax (20% above £12,570 then 40% above £50,270) plus 8% employee NI (2% above £50,270). If you sacrifice £5,000 of that into pension, the £5,000 never appears as taxable salary — you save 20% income tax (£1,000), 8% NI (£400), and your employer also saves 13.8% employer NI (£690). The total leaving the system is £2,090 — money that would have gone to HMRC instead going into your pension if your employer passes through their NI saving.
For someone earning above £50,270, the maths is even better — they save 40% income tax plus 2% NI on the sacrificed amount, totalling 42% personal savings before employer passback. For income above £100,000, the picture changes again: between £100,000 and £125,140 the personal allowance tapers, creating a 60% effective marginal tax rate. Salary sacrificing £25,000 at this earning level can save 60% income tax + 2% NI = 62% on every pound — by far the most tax-efficient form of remuneration available to UK employees.
Pension salary sacrifice — the universal winner
Pension salary sacrifice is universally favourable for almost any UK employee — the only edge cases are (a) people approaching the £60,000 annual allowance limit, (b) people whose employer doesn't offer it (you can use a 'relief at source' or 'net pay' personal pension instead, with similar but smaller benefits), and (c) people about to apply for a mortgage where the reduced reference salary would matter.
The most common UK pension sacrifice arrangement is matching: the employer matches your sacrifice up to a percentage cap (typically 5-8%) and may also passback their employer NI saving. A 5% employee sacrifice on a £55,000 salary, matched 5% by the employer, produces 10% pension contribution at almost zero net cost to the employee. Over a 30-year career, this difference compounds to hundreds of thousands of pounds in pension wealth — the single most under-claimed benefit in UK employment.
EV salary sacrifice — favourable through 2028
Electric vehicle salary sacrifice is currently extraordinarily tax-efficient because Benefit-in-Kind tax on EVs is capped at 3% in 2026/27, rising to 5% by 2028/29 — versus 20-40% BiK on petrol/diesel cars. A £40,000 EV on a 4-year lease at £600/month sacrificed gross saves a 40% taxpayer roughly £2,880/year in income tax + NI. The BiK adds back £40,000 × 3% × 40% = £480 in income tax. Net saving: ~£2,400/year compared to taking the same money as salary.
EV sacrifice is most favourable for higher-rate taxpayers (40%+ band) and least favourable for basic-rate taxpayers near the threshold. The economics weaken each year as BiK rates increase — by 2028/29 they will still favour higher-rate but the margin shrinks materially. If you're considering EV sacrifice, the 2026/27 and 2027/28 windows are the most favourable period.
Cycle-to-work — small but reliable
Cycle-to-work schemes let you sacrifice up to £3,000 (since the cap was lifted) for a bike and equipment. Tax + NI savings on a £1,500 bike for a 40% taxpayer are about £630 — meaningful for the size but not life-changing. The structural quirk: cycle-to-work is technically a hire-purchase agreement. After the sacrifice period (typically 12 months), you either pay a 'fair market value' transfer fee, extend the hire, or return the bike. Most employees pay the transfer fee, which HMRC's published table sets at 18-25% of original value depending on bike age.
Bonus sacrifice — the most efficient one-off move
Bonus sacrifice is salary sacrifice applied to a one-off bonus rather than ongoing salary. For higher-rate taxpayers, this is the single most tax-efficient annual move available. A £10,000 bonus taken as cash incurs 40% income tax + 2% NI = £4,200 deductions, leaving £5,800 net. Sacrificed into pension, the full £10,000 lands in pension untaxed; if the employer passes through their 13.8% NI saving, an additional £1,380 is added — total of £11,380 in pension instead of £5,800 in cash. That's a 96% better outcome.
Bonus sacrifice usually requires the election to be made before the bonus is announced. Most UK employers run an annual window in March or before the bonus cycle. Plan ahead — making the election after the bonus has been confirmed is usually impossible because of HMRC rules on 'effective sacrifice' (you can't sacrifice money you've already become contractually entitled to).
The salary sacrifice trap-doors no one warns you about
Mortgage applications. UK lenders use post-sacrifice reference salary for affordability, not gross. A £60,000 salary with £8,000 sacrifice often qualifies as £52,000 for mortgage purposes — meaning the maximum loan is £32,000-£40,000 lower. If you're applying for a mortgage in the next 12 months, pause the sacrifice during the application period.
Maternity pay. Statutory Maternity Pay's 90% rate uses post-sacrifice average weekly earnings. Aggressive sacrifice during the SMP qualifying period (the 8 weeks before the qualifying week) reduces SMP. Run our SMP calculator with and without your sacrifice level to see the difference.
Statutory Sick Pay. SSP is also calculated on post-sacrifice earnings. Less impactful than SMP because SSP is a flat rate (£118.75/week in 2026/27) with a low earnings threshold (£125/week), but worth knowing if you sacrifice down close to the threshold.
State Pension qualifying years. NI contributions count towards State Pension. Salary sacrifice reduces NIable earnings, so very heavy sacrifice could theoretically affect qualifying years. In practice, almost no UK full-time employee sacrifices below the Lower Earnings Limit (£125/week), so this is rarely a real issue — but worth checking if you're aggressive.
Why I built this calculator
Salary sacrifice is one of the most under-explained UK benefits. HR portals show the sacrifice but not the tax saving. Pension providers show the contribution but not the NI passback. The result: most UK employees underuse it because they can't see the actual benefit. This calculator models the full picture — your tax saving, your NI saving, the employer passback if applicable, and the impact on net pay. Pair with the UK take-home pay calculator to see the side-by-side comparison.
Common questions
- What is salary sacrifice in the UK?
- Salary sacrifice is an arrangement where you give up part of your gross salary in exchange for a non-cash benefit — most commonly pension contributions, an electric car, or a cycle-to-work bike. Because the sacrifice happens before income tax and National Insurance are calculated, you save both. For pension salary sacrifice on a £55,000 salary sacrificing £5,000, you save 20% income tax (£1,000) plus 8% employee NI (£400) — a £1,400 saving on a £5,000 contribution. Many UK employers also pass back their 13.8% employer NI saving (£690), which can be added to your pension on top.
- Is salary sacrifice worth it?
- For pension salary sacrifice, almost always — you save income tax, employee NI, and often a chunk of employer NI. The savings are larger if you cross tax bands (e.g. sacrificing into pension to bring your income below £50,270 saves higher-rate tax on the sacrificed amount). For EV salary sacrifice, the maths is favourable in 2026/27 because Benefit-in-Kind tax on electric cars is capped at 3% (rising to 5% by 2028). Cycle-to-work schemes save tax and NI on the bike value but the bike is technically hire-purchase. Run the numbers above for your specific situation.
- Does salary sacrifice affect my mortgage application?
- It can. UK lenders typically use your post-sacrifice 'reference salary' rather than gross pre-sacrifice salary when calculating affordability. If you sacrifice £8,000 of a £60,000 salary into pension, your reference salary for mortgage purposes is often £52,000 — meaning the maximum mortgage is reduced by 4-5x £8,000 = £32,000-£40,000 depending on the lender's multiplier. If you're applying for a mortgage in the next 12 months, consider pausing or reducing salary sacrifice during the application window.
- Does salary sacrifice affect maternity pay?
- Yes — and this is one of the most under-discussed UK salary sacrifice issues. Statutory Maternity Pay's 90% rate (first 6 weeks) is calculated from your average weekly earnings AFTER salary sacrifice. So sacrificing heavily into pension reduces your SMP calculation base. If you're planning maternity leave within 12-18 months, run the SMP calculator both with and without your current sacrifice level to see the impact. Some UK employers will pause salary sacrifice during the SMP qualifying period, but most don't unless you ask explicitly.
- Does salary sacrifice affect my State Pension or other benefits?
- Possibly. State Pension entitlement requires 35 qualifying years of National Insurance contributions. Salary sacrifice reduces your NIable earnings, which could affect qualifying years if you sacrifice down below the Lower Earnings Limit (£125/week in 2026/27). For most full-time employees, the sacrifice doesn't drop earnings below this threshold, so State Pension qualifying years are unaffected. Statutory Sick Pay and Statutory Maternity Allowance can both be reduced by salary sacrifice because they're calculated on post-sacrifice earnings. Worth checking before sacrificing aggressively.
- What is bonus sacrifice and is it worth it?
- Bonus sacrifice is the most tax-efficient form of salary sacrifice — instead of receiving a £10,000 bonus and paying 40% income tax + 2% NI = £4,200 in deductions, you sacrifice the bonus into pension and pay nothing on it. Plus your employer's 13.8% NI saving can be added to the pension if your employer passes it through. For higher-rate taxpayers, bonus sacrifice is essentially a 50%+ effective return on the sacrificed amount once you account for tax savings and employer NI top-up. Time-limited: most UK employers require the sacrifice election before the bonus is announced, so plan ahead in your annual cycle.
- Are there any salary sacrifice schemes I should avoid?
- Avoid sacrifice schemes that promise tax savings on items not on HMRC's approved list — meals, mobile phones (post-2017 rules tightened), or non-electric company cars. HMRC has aggressively closed loopholes since 2017 and unauthorised schemes can result in tax claims years later. The reliable mainstream UK schemes are: pension (universally good), electric vehicles (very good through 2028), cycle-to-work (small-value but reliable), and workplace nursery (specific eligibility). Avoid schemes promoted by private providers without employer involvement — these are usually disguised loans and have come unstuck legally.