Salary sacrifice lets you give up part of your gross salary so your employer pays it straight into your pension. Because the money never counts as your pay, neither of you pays National Insurance on it. In 2026/27 that saves a basic-rate employee 8 per cent, or 2 per cent above the upper earnings limit, on top of full income tax relief — and saves the employer 15 per cent. From 6 April 2029, only the first £2,000 sacrificed each tax year keeps that exemption. That change is now law, not just an announcement.
This guide covers the mechanic, the take-home pay maths for a basic-rate and a higher-rate earner on 2026/27 rates, the knock-on effects that catch people out, the two situations where sacrifice is worth far more than the headline saving, and exactly what the 2029 cap does.
What salary sacrifice actually is
HMRC’s guidance for employers is blunt about it: a salary sacrifice is an agreement to reduce an employee’s entitlement to cash pay, usually in return for a non-cash benefit. Some employers call it salary exchange or SMART pensions.
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The key word is contract. It has to be varied before you become entitled to the pay, and your payslip has to show the reduced salary — which is why employers run sacrifice changes at set windows rather than letting you flip it monthly. Your gross salary is then genuinely lower, and your employer pays the sacrificed amount into your pension alongside its own contribution. On your pension statement the whole lot usually shows up as an employer contribution.
Why the National Insurance saving is the whole point
Pension contributions get income tax relief whichever route you use. What sacrifice adds is National Insurance: because the money is never your pay, it never enters the calculation for either side.
For 2026/27 the employee Class 1 rate is 8 per cent on earnings between the primary threshold of £12,570 and the upper earnings limit of £50,270, then 2 per cent above that. The employer pays 15 per cent on everything above a secondary threshold of just £5,000. So the employer’s saving is bigger than yours in percentage terms, and it does not stop at any upper limit.
That is why many employers pass some of their 15 per cent saving into your pension too. Not all do, and there is no obligation to — check your scheme booklet. Pensions also kept their full advantage when the optional remuneration rules were tightened in April 2017, unlike most other sacrificed benefits.
Worked examples: a basic-rate and a higher-rate earner in 2026/27
These figures use England, Wales and Northern Ireland income tax rates, a personal allowance of £12,570 and a basic-rate band of £37,700. Sarah earns £35,000 and sacrifices 5 per cent; James earns £70,000 and sacrifices 10 per cent.
| 2026/27 tax year | Basic-rate earner | Higher-rate earner |
|---|---|---|
| Salary before sacrifice | £35,000 | £70,000 |
| Amount sacrificed | £1,750 (5%) | £7,000 (10%) |
| New gross salary | £33,250 | £63,000 |
| Income tax, before → after | £4,486 → £4,136 | £15,432 → £12,632 |
| Employee NI, before → after | £1,794 → £1,654 | £3,411 → £3,271 |
| Take-home pay before | £28,720 | £51,157 |
| Take-home pay after | £27,460 | £47,097 |
| Net cost of the pension contribution | £1,260 | £4,060 |
| Employer NI saved at 15% | £263 | £1,050 |
Sarah puts £1,750 into her pension for £1,260 of take-home pay — 72 pence in the pound, being the 20 per cent tax and 8 per cent National Insurance she would otherwise have paid. James puts £7,000 in for £4,060, or 58 pence in the pound, because his sacrifice sits above the upper earnings limit where employee National Insurance is only 2 per cent.
Note the wrinkle: James’s National Insurance saving is smaller in percentage terms than Sarah’s. Someone on £55,000 sacrificing £6,000 would save 2 per cent on the slice above £50,270 and 8 per cent on the rest.
Scottish taxpayers pay the same National Insurance, set UK-wide, but different income tax. Scotland has six rate bands in 2026/27, from a 19 per cent starter rate to a 48 per cent top rate, and its 42 per cent higher rate bites from £43,663 rather than £50,270. That makes sacrifice more valuable for many middle-income Scots. Welsh rates match England’s.
Why higher earners often do better than with relief at source
Most personal and many workplace pensions use relief at source: you pay from taxed income, the provider claims 20 per cent back from HMRC, and anyone taxed above the basic rate claims the rest through a tax return or a tax-code adjustment.
Sacrifice removes that second step. James gets his full 40 per cent relief the moment payroll runs. Through relief at source the same £7,000 would cost him £5,600 up front with £1,400 refunded later — relief plenty of higher-rate taxpayers never claim. On top sits his £140 National Insurance saving, plus any share of the employer’s £1,050 passed on.
Sacrifice does not change the annual allowance. Contributions still count towards the standard £60,000 limit, so it creates no extra headroom.
The two situations where it is worth far more than it looks
Getting back under £100,000
The personal allowance falls by £1 for every £2 of adjusted net income above £100,000, reaching zero at £125,140 — a 60 per cent effective tax rate across that band. Add 2 per cent National Insurance and every £1,000 sacrificed there costs just £380 of take-home pay.
Someone on £110,000 who sacrifices £10,000 lands exactly on £100,000, recovers the full personal allowance, and gives up £3,800 of net pay to do it. Sacrifice reduces gross employment income, so it reduces adjusted net income — the figure the taper is measured against.
Getting back under the child benefit threshold
The High Income Child Benefit Charge starts once the higher earner in a household has adjusted net income above £60,000, clawing back 1 per cent of the child benefit for every £200 above it, and taking all of it at £80,000.
Take James on £70,000 with two children. Child benefit is £27.05 a week for the eldest and £17.90 for the second — £2,337 a year — and at £70,000 he loses half of it, a charge of about £1,169. Sacrificing £10,000 takes him to £60,000 and wipes it out, so the contribution costs £5,800 of take-home pay less the £1,169 avoided: roughly £4,631.
Both work with ordinary personal pension contributions too. Sacrifice just gets you there more cheaply and without waiting for a tax return.
The knock-on effects people miss
Your gross salary is the number the rest of the financial world looks at, and sacrifice makes it smaller. That has consequences that rarely appear in the scheme brochure.
- Mortgage affordability. Lenders assess borrowing from gross income, so a reduced salary can shrink the maximum loan. Some add sacrificed contributions back; many do not.
- Statutory maternity, paternity and sick pay. These use average weekly earnings after sacrifice. The first six weeks of statutory maternity pay are 90 per cent of those earnings, and if average weekly earnings fall below the lower earnings limit of £129 a week entitlement can disappear. HMRC warns employers about exactly this.
- Death-in-service and income protection cover. Usually a multiple of salary — check whether your scheme uses the reduced figure or a notional pre-sacrifice one.
- Redundancy, bonuses and salary references. Anything defined as a multiple of basic pay uses the lower number unless the rules say otherwise.
What it does not damage is your State Pension. Qualifying years depend on earnings above the lower earnings limit — £6,708 a year in 2026/27 — not on how much National Insurance you pay, and the new State Pension is flat rate.
Why some employers will not let low earners join
A sacrifice cannot take your cash pay below the minimum wage. HMRC is explicit that arrangements must not reduce cash earnings below National Minimum Wage rates and that employers must cap deductions to stay compliant. There is no exemption, and the penalties fall on the employer.
From April 2026 the National Living Wage for workers aged 21 and over is £12.71 an hour, with £10.85 for 18 to 20 year olds and £8.00 for under-18s and eligible apprentices. Someone working 37.5 hours a week at £12.71 earns about £477 a week, or roughly £24,785 a year, with no headroom at all.
So many employers exclude lower-paid staff, or run an automatic check that reverts them to ordinary contributions in any month the floor would be breached. That is the law, not the employer being awkward.
Know your real marginal rate before you decide
The value of salary sacrifice depends entirely on which tax band your last pound of pay sits in.
Explore GetSmartSaver →The £2,000 cap arriving in April 2029
Announced at the Autumn Budget on 26 November 2025, this is now law. The National Insurance Contributions (Employer Pensions Contributions) Act 2026 received Royal Assent on 29 April 2026, and section 1 requires the first regulations to set the contributions limit at £2,000 for a tax year, with effect from the 2029–30 tax year.
From 6 April 2029, anything sacrificed above £2,000 in a tax year counts as earnings for National Insurance. HMRC’s policy paper confirms the excess is subject to Class 1 primary and secondary contributions, so both sides pay. Income tax relief is untouched.
Two points of precision: the limit applies per employee per tax year, not per contribution; and genuine employer contributions remain free of National Insurance without limit.
HMRC estimates around 7.7 million employees use salary sacrifice for pensions, of whom roughly 3.3 million sacrifice more than £2,000 a year, along with about 290,000 employers. The House of Commons Library briefing records the Office for Budget Responsibility scoring the measure at £4.7 billion in 2029/30. The Bill was amended in the Lords during its passage, but the Act as enacted carries the £2,000 figure.
The Institute for Fiscal Studies found the effect heavily concentrated: about 15 per cent of employees sacrifice above £2,000, rising to 48 per cent in the top tenth of earners and under 1 per cent in the bottom fifth. It questions whether the reform simply replaces one arbitrary distinction with another.
| Sacrificed in the tax year | Above the £2,000 limit | Employee NI at 8% | Employee NI at 2% | Employer NI at 15% |
|---|---|---|---|---|
| £2,000 | £0 | £0 | £0 | £0 |
| £3,600 | £1,600 | £128 | £32 | £240 |
| £7,000 | £5,000 | £400 | £100 | £750 |
| £12,000 | £10,000 | £800 | £200 | £1,500 |
What to do before it starts
For most people, nothing dramatic. The change is nearly three years away, income tax relief is unaffected, and even at the top of that table the extra employee cost is a couple of hundred pounds a year.
- Check your payslip. If the pension line reduces your gross pay rather than your net pay, you are already on sacrifice.
- Ask whether your employer passes on any of its 15 per cent National Insurance saving. If not, that is a fair thing to raise.
- If your income is near £100,000 or the £60,000 child benefit threshold, work out what sacrifice would take you back under. That is where the biggest gains sit, and the 2029 cap does not touch them.
- Applying for a mortgage within twelve months? Check how the lender treats sacrificed pay before increasing your contribution.
- Do not stop contributing because of the cap. Cutting pension saving to dodge a small National Insurance charge costs far more in the long run.
If your workplace pension is your main retirement vehicle, the basics matter as much as the sacrifice decision.
Next steps: if you are unsure how your scheme is set up, start with our guide to how a workplace pension works in 2026, and if you have picked up old pots along the way, read our walkthrough on pension consolidation. Parents earning between £60,000 and £80,000 should read our explainer on the High Income Child Benefit Charge alongside this one. To see what a sacrifice does to your monthly pay, use our take-home pay calculator.
Frequently Asked Questions
Is salary sacrifice better than paying into my pension from my net pay?
Usually, yes. Both routes get income tax relief, but only sacrifice avoids National Insurance — 8 per cent for a basic-rate earner in 2026/27, or 2 per cent above the upper earnings limit. Higher-rate taxpayers also get full relief immediately instead of claiming it back. The trade-off is a lower gross salary.
Does salary sacrifice reduce my State Pension?
Not in normal circumstances. Qualifying years for the new State Pension depend on earnings above the lower earnings limit, £6,708 in 2026/27, not on how much National Insurance you pay, and the new State Pension is flat rate with no earnings-related top-up. The risk only arises for low earners whose pay after sacrifice falls near that limit.
Will the £2,000 cap apply to my employer’s own contributions?
No. Genuine employer pension contributions stay free of National Insurance without limit. The cap only bites on amounts sacrificed from your own salary. From 6 April 2029, sacrifice above £2,000 in a tax year counts as earnings, and both employee and employer Class 1 National Insurance fall due on the excess. Income tax relief is unchanged.
Can salary sacrifice get me back under £100,000 or the child benefit threshold?
Yes. Sacrifice reduces gross employment income, which reduces adjusted net income — the measure used for both the personal allowance taper above £100,000 and the High Income Child Benefit Charge above £60,000. Between £100,000 and £125,140 the effective relief reaches 62 per cent once National Insurance is counted. Personal pension contributions do the same thing more slowly.
Does salary sacrifice affect my mortgage application?
It can. Lenders assess affordability on gross income, and sacrifice lowers the figure on your payslip and your employer’s reference. Some add sacrificed pension contributions back into the assessment; others do not, and policies differ widely. If you expect to apply within the next year, check with the lender before increasing your sacrifice.
Should I stop using salary sacrifice before April 2029?
There is no general case for stopping. Income tax relief is untouched and the first £2,000 sacrificed each year keeps its National Insurance exemption. Someone sacrificing £7,000 while earning above the upper earnings limit would face roughly £100 of extra employee National Insurance a year. Cutting pension saving to avoid that costs more than it saves.
Last reviewed: August 2026. Figures use 2026/27 HMRC rates and thresholds and were correct at the time of writing. This article is general information, not personal financial advice. Tax treatment depends on your circumstances and may change. If you are unsure, speak to a regulated financial adviser or your employer’s pension scheme.
