Salary sacrifice pension — the full UK guide
By the PaySlipCheck Editorial team · 19 May 2026 · 10 min read
Salary sacrifice is the most tax-efficient way to pay into a pension in the UK. Every £100 you sacrifice saves you Income Tax and National Insurance — and often your employer's NI too, if they pass on the saving. For higher-rate taxpayers it costs about £58 of take-home to put £100 into your pension. For anyone earning £100,000+, it's the only sensible way to deal with the 60% trap. Here's exactly how it works and when it makes sense.
What salary sacrifice is
Salary sacrifice is a contractual arrangement where you give up part of your gross salary in return for a non-cash benefit. In pension terms: you agree to a lower salary, and your employer pays the difference straight into your workplace pension. The sacrificed amount never appears as your income, so it's never subject to Income Tax or National Insurance.
The result is the same pound going into your pension, but at a much lower cost to your take-home pay than putting the equivalent into a personal pension after tax. That difference is the tax break.
How it compares to other pension contribution methods
UK pensions can be funded in three ways. The mechanics matter:
| Method | How it works | Income Tax saving | NI saving |
|---|---|---|---|
| Salary sacrifice | Gross salary reduced before any tax/NI calculations | Yes — at your marginal rate | Yes — 8% or 2% |
| Net pay arrangement | Pension comes off gross before Income Tax (but after NI) | Yes — at your marginal rate | No |
| Relief at source | Pension comes off take-home; provider claims 20% back automatically | 20% automatic; rest via Self Assessment for higher-rate | No |
For a basic-rate taxpayer, the difference between salary sacrifice and the others is the 8% NI saving — about £80 a year on a £1,000 contribution. For a higher-rate taxpayer (in the 42% combined band) it's still the 2% NI saving, plus the convenience of getting the full 40% tax relief automatically rather than having to claim it via Self Assessment.
The numbers, by salary band
Basic-rate taxpayer (£12,570 – £50,270)
You're in the 20% + 8% = 28% marginal band. £100 of salary sacrifice into pension means:
- £100 into your pension.
- Take-home reduction: £72 (you don't pay 20% tax or 8% NI on the £100).
- Effective cost per £100 saved for retirement: £72.
Higher-rate taxpayer (£50,270 – £100,000)
You're in the 40% + 2% = 42% marginal band:
- £100 into your pension.
- Take-home reduction: £58.
- Effective cost per £100 saved: £58.
The £100k–£125,140 60% trap band
The 40% Income Tax plus the 20% from personal allowance taper plus 2% NI = 62% marginal rate. £100 of salary sacrifice means:
- £100 into your pension.
- Take-home reduction: £38 (only 38p of every £1 in this band actually reaches you).
- Effective cost per £100 saved: £38.
This is the most efficient pension contribution in the UK system. If your income is anywhere in this band and your employer offers sacrifice, you should be sacrificing at least the excess above £100,000 — it's an immediate 62% tax saving.
Additional-rate taxpayer (£125,140+)
45% + 2% = 47% marginal:
- £100 into your pension.
- Take-home reduction: £53.
- Effective cost per £100 saved: £53.
Worked example: £60,000 salary, 10% sacrifice
Without sacrifice: £60,000 gross → £45,357 take-home.
With £6,000/year salary sacrifice: effective gross £54,000 → £41,877 take-home + £6,000 into pension.
- Take-home dropped by £3,480.
- Pension grew by £6,000.
- The £2,520 difference is the Income Tax + NI saving — the bit you would have lost to HMRC anyway.
Effective cost: £3,480 of take-home for £6,000 in pension. That's a 58% effective contribution — i.e. 42p of every £1 going into your pension was actually HMRC's, not yours.
Use the salary sacrifice calculator to model any salary/percentage combination.
The employer NI bonus
Employers pay 15% Secondary NI on most salary above £5,000 (2025/26). When you sacrifice salary, your employer saves on that 15% too. Some employers pass all or part of that saving back to you by adding it to your pension contribution.
Example: you sacrifice £6,000. Your employer's NI bill drops by ~£900 (15% × £6,000). If they pass on the full £900, your pension contribution becomes £6,900 instead of £6,000. That's a free 15% boost on every pound you sacrifice.
Whether your employer does this varies wildly. Tech and financial-services firms often pass on 50–100% of the NI saving. Smaller employers and public-sector employers often keep it. Ask HR or check the scheme literature — it can mean a couple of hundred pounds a year of free pension contributions.
Limits and rules
Annual allowance: £60,000
You can put up to £60,000 (or 100% of your relevant earnings, whichever is lower) into pensions in a tax year and get tax relief on all of it. Salary sacrifice counts towards this limit — including any employer match.
Tapered annual allowance for high earners
If your "adjusted income" (broadly: salary + pension contributions + other taxable income) is above £260,000, the annual allowance starts to taper by £1 for every £2 above the threshold, down to a minimum of £10,000 at £360,000 of income.
Carry-forward
If you haven't used the full annual allowance in the previous three tax years, you can carry forward the unused allowance. This is useful for one-off large contributions (e.g. an annual bonus sacrifice).
Minimum wage check
Salary sacrifice can't take you below the National Minimum Wage. Your employer's payroll system will normally block this automatically — but be aware if you're a part-time worker or near minimum wage to start with.
Where salary sacrifice can hurt you
Mortgage applications
Some mortgage lenders will assess you on your post-sacrifice salary, not the pre-sacrifice figure. If you're applying for a mortgage in the next 12 months and your gross-to-borrowing-power ratio matters, talk to a broker before increasing your sacrifice.
Statutory pay (SMP, SSP, SPP)
Statutory Maternity Pay is calculated on average earnings — your post-sacrifice salary. Reducing your sacrifice in the 12-week qualifying period before maternity leave can meaningfully increase your SMP entitlement. Many HR teams will suggest this if you flag pregnancy early.
Life insurance and death-in-service
Death-in-service cover is usually calculated as a multiple of salary. If "salary" is your post-sacrifice figure, your cover drops. Check the wording with HR — some employers specifically use "reference salary" (the pre-sacrifice number) to avoid this.
Student loan repayments
Student loan repayments are 9% of income above the plan threshold. Salary sacrifice reduces the salary that the deduction is calculated from, so your monthly student loan repayment drops slightly. Useful if you want to keep more cash today; less useful if your aim is to clear the loan faster.
State Pension qualifying years
You need NI contributions on at least £6,396 of earnings to "earn" a qualifying year toward State Pension. Salary sacrifice can take you below this if you sacrifice aggressively from a low salary. Above ~£18,000 it's not a concern.
How to set it up
- Check whether your employer offers salary sacrifice. Most medium and large UK employers do. Smaller employers often don't — though it's growing.
- Decide your contribution rate. If your employer matches, hit the match cap first. Beyond that, consider sacrificing the slice of salary that crosses tax bands you want to avoid (£50,270, £100,000).
- Submit the variation to your contract. Salary sacrifice is technically a contract change. HR will handle the paperwork — usually a one-page form or online portal.
- Wait one payroll cycle. The new arrangement takes effect from the next pay period. Your payslip should show the reduced gross and the increased pension contribution.
- Review annually. Most schemes let you adjust the percentage once or twice a year (often at the April tax-year boundary).
Quick decision rules
- Always take the employer match. Free money. If they'll match up to 5%, contribute at least 5% — sacrifice or otherwise.
- If you're a higher-rate taxpayer, prefer sacrifice over relief-at-source. Same Income Tax outcome, but you also save 2% NI and don't have to claim the extra 20% via Self Assessment.
- If you're between £100,000 and £125,140, sacrifice the excess above £100k. 62% effective tax saving.
- If you're near minimum wage, don't sacrifice. Or sacrifice only a small amount. Personal pension contributions still get basic-rate relief.
- If you're planning maternity leave, suspend sacrifice 12+ weeks before. SMP is based on post-sacrifice earnings.
Salary sacrifice is, for many people, the single largest tax break they have available — and it compounds quietly for decades. If you're using it aggressively because you've decided to retire earlier than the default, PennyWise Finance has a longer piece on early retirement (FIRE) in the UK covering the maths of the broader plan that sacrifice slots into.
Related: Salary sacrifice calculator · Pension projection calculator · £100,000 after tax — the 60% trap · How UK bonuses are taxed