Pension Salary Sacrifice Explained

Salary sacrifice for pension contributions is one of the most tax-efficient arrangements available to UK employees. By agreeing to reduce your contractual salary in exchange for increased employer pension contributions, you save both income tax and National Insurance, rather than just income tax through the standard "relief at source" method. This guide explains how salary sacrifice works, who benefits, and what to watch out for.

Not every employer offers salary sacrifice, and those that do may call it something different: "salary exchange", "smart pension", or "SMART contributions" are all common names for the same arrangement. If you are unsure whether your workplace pension uses salary sacrifice, check your contract or speak to your HR department.

How Salary Sacrifice Works

Under a salary sacrifice arrangement:

You agree with your employer to reduce your gross salary by the amount of your pension contribution.
Your employer pays the sacrificed amount directly into your pension scheme as an employer contribution.
Your reduced salary is used as the basis for calculating income tax and National Insurance.
Because your gross pay is lower, you pay less tax and NI.

The key difference from relief at source: with salary sacrifice, the money never counts as your earnings at all. With relief at source, it counts as your earnings first (you pay NI on it) and the pension deduction happens after tax.

To put it simply, under relief at source your pension contribution is deducted from your net pay and the pension provider claims basic rate tax relief on your behalf, but you still pay National Insurance on the full amount. Under salary sacrifice, your contractual pay is reduced before either tax or NI is calculated, so you save on both. You can use the Pension Contribution Calculator to model both methods side by side.

2026/27 Tax Rates at a Glance

To understand the savings, you need to know the rates for the current tax year. For 2026/27 in England, Wales, and Northern Ireland:

Personal allowance: £12,570 (reduced by £1 for every £2 earned above £100,000)
Basic rate: 20% on income from £12,571 to £50,270
Higher rate: 40% on income from £50,271 to £125,140
Additional rate: 45% on income above £125,140
Employee NI: 8% between £12,570 and £50,270; 2% above £50,270
Employer NI: 15% above the secondary threshold

For full details and the Scottish rates, see our income tax bands guide and the Income Tax Calculator.

Tax Savings: Salary Sacrifice vs Relief at Source

Here's a direct comparison for a 5% pension contribution at different salary levels:

Salary	Contribution	Tax Saved (Both Methods)	NI Saved (Sacrifice Only)	Total Extra Saving
£25,000	£1,250	£250	£100	£100/year
£35,000	£1,750	£350	£140	£140/year
£50,000	£2,500	£500	£200	£200/year
£60,000	£3,000	£1,200*	£60	£60/year
£105,000	£5,250	£3,150*	£105	£3,150/year*

*At £60,000, the contribution spans basic and higher rate bands. At £105,000, the contribution triggers the personal allowance restoration, making the tax saving much larger.

Worked Example: Basic Rate Taxpayer on £30,000

Alice earns £30,000 and contributes 5% (£1,500) to her pension. Here is what happens under each method:

Relief at source: Alice's gross salary stays at £30,000. She pays employee NI on the full £30,000, which means NI is charged at 8% on the portion between £12,570 and £30,000, that is £17,430 x 8% = £1,394.40 per year. Her pension contribution of £1,500 is deducted from her net pay, and her pension provider claims 20% basic rate relief, adding £375 to her pot. Total pension contribution: £1,875. Total NI paid on the £1,500 portion: £120.

Salary sacrifice: Alice's contractual salary drops to £28,500. She pays NI only on the reduced amount: (£28,500 - £12,570) x 8% = £1,274.40. Her employer pays £1,500 directly into her pension as an employer contribution. No basic rate tax relief claim is needed because the money was never taxed. Total pension contribution: £1,500 (but she keeps an extra £120 in take-home pay from the NI saving). If her employer passes on its own NI saving (15% x £1,500 = £225), the total pension pot contribution rises to £1,725, and Alice still keeps more take-home pay than under relief at source.

Use the Salary Calculator to model your own figures.

Worked Example: Higher Rate Taxpayer on £70,000

Ben earns £70,000 and contributes 8% (£5,600) via salary sacrifice. His contractual salary becomes £64,400. Because £5,600 of his income was above the upper earnings limit for NI (£50,270), only part of the sacrifice falls in the 8% NI band. The NI saving breaks down as follows:

£5,600 sacrificed, of which roughly £19,730 of his original salary sat above the UEL (£70,000 - £50,270 = £19,730).
The sacrifice reduces his salary from £70,000 to £64,400. Since £64,400 is still above £50,270, the entire £5,600 sacrifice came from the 2% NI band.
NI saving: £5,600 x 2% = £112 per year.

Ben also saves 40% income tax on the full £5,600, which is £2,240. Under relief at source, he would get only 20% automatic relief (£1,120) and would need to claim the additional 20% (£1,120) through self-assessment. Salary sacrifice gives him the full tax benefit immediately, without needing to file a tax return for higher rate relief. This is a significant administrative advantage.

You can check the NI thresholds and rates using our National Insurance Calculator.

The £100,000 Strategy

Salary sacrifice becomes exceptionally powerful for earners between £100,000 and £125,140. In this range, the personal allowance taper creates an effective 60% marginal tax rate (plus 2% NI = 62%). Sacrificing enough salary to drop below £100,000 saves tax at this 62% rate.

Example: earning £112,000 and sacrificing £12,000 into your pension:

Gross salary	£112,000
Sacrifice	£12,000
New gross	£100,000
Personal allowance restored	£12,570 (was £6,570)
Income tax saving	~£7,200
NI saving	£240
Lost take-home pay	~£4,560
Amount into pension	£12,000
Effective cost per £1 of pension	38p

For every £1 you put into your pension, you only lose 38p of take-home pay. This is the single most tax-efficient arrangement in the UK tax system for employees in this income range.

The maths behind this is worth understanding. When your adjusted net income sits between £100,000 and £125,140, each additional £2 of income costs you £1 of personal allowance. That lost allowance is then taxed at 40%, creating an extra 20% charge on top of the 40% higher rate, hence the 60% effective rate. By sacrificing income back below £100,000, you reclaim the full personal allowance and undo the taper entirely. You can verify this using the Take-Home Pay Calculator by entering your gross salary with and without pension sacrifice.

How Far Below £100,000 Should You Go?

There is no benefit to the 60% taper relief once your adjusted net income is already at or below £100,000. If your salary is £108,000, sacrificing exactly £8,000 brings you to £100,000 and restores £4,000 of personal allowance (£8,000 / 2). Sacrificing a further £1,000 to £99,000 only saves at the normal 40% + 2% NI rate, which is still attractive but not the 62% rate. Target your sacrifice to get as close to £100,000 as possible for the maximum taper benefit, then assess whether further contributions are worthwhile at the standard higher rate saving.

Employer NI Savings

Your employer also saves NI on the sacrificed amount, 15% in 2026/27. On a £3,000 sacrifice, the employer saves £450. Some employers pass this saving to you as an additional pension contribution, while others keep it. Check your scheme documentation or ask your HR department.

If your employer passes the saving through, your pension contribution is effectively more than 5% of your original salary; the employer NI saving adds an extra 15% boost. On a £50,000 salary with 5% sacrifice (£2,500), the employer could add their £375 NI saving, bringing the total pension contribution to £2,875.

It is worth asking your employer directly about this. Many large employers now pass on the full employer NI saving as standard. Some pass on a portion (for example, 50%) and retain the rest to cover administration costs. Even a partial pass-through is free money into your pension that you would not receive under relief at source.

Annual Allowance and Contribution Limits

Under salary sacrifice, the entire contribution is classified as an employer contribution. This is important because all pension contributions (whether from you or your employer) count towards the annual allowance, which is £60,000 for 2026/27 (or 100% of your earnings, whichever is lower).

If your total pension contributions (including any employer match) exceed £60,000, you will face an annual allowance charge. High earners with adjusted income above £260,000 may have a reduced annual allowance under the tapered annual allowance rules, which can drop as low as £10,000. If you are a very high earner considering large salary sacrifice contributions, seek advice from a qualified financial adviser or check the GOV.UK annual allowance guidance.

You may also be able to use unused annual allowance from the previous three tax years through "carry forward". This can allow much larger one-off contributions, particularly useful if you have had a pay rise or bonus and want to maximise tax efficiency.

Considerations and Drawbacks

Impact on Mortgage Applications

With salary sacrifice, your P60 and payslip show the reduced salary. A £50,000 salary with 10% sacrifice shows as £45,000 on your P60. Most mortgage lenders will use this lower figure:

At 4.5x income multiple, a £50,000 salary gives a maximum mortgage of £225,000.
With 10% sacrifice showing £45,000, the maximum drops to £202,500, a £22,500 reduction.
Some lenders will "add back" pension sacrifice if you provide a letter from your employer, but not all.

If you're planning to apply for a mortgage, discuss this with your broker before increasing your sacrifice. Some brokers recommend temporarily opting out of salary sacrifice (if your scheme allows it) for two to three months before application so that your payslips reflect your full salary. However, you would lose the NI and tax savings during that period, so weigh the trade-off carefully.

Impact on Other Benefits

Salary sacrifice can affect benefits calculated on your gross salary:

Life insurance: Often a multiple of salary. If calculated on post-sacrifice salary, your cover decreases.
Statutory pay: Statutory Sick Pay, Maternity Pay, and Paternity Pay are based on your actual (post-sacrifice) earnings. If sacrifice reduces your pay below the qualifying threshold, you could lose entitlement.
Redundancy pay: Statutory redundancy is based on your actual salary, which may be the post-sacrifice amount.
Salary cannot go below minimum wage: Salary sacrifice cannot reduce your pay below National Minimum Wage.

Many employers have safeguards built into their salary sacrifice schemes. For instance, your employer may automatically reduce or suspend salary sacrifice if your earnings would otherwise fall below the lower earnings limit for NI (£6,708 in 2026/27) or below the National Minimum Wage. Always check the terms of your specific scheme.

Impact on State Pension Qualification

To build up qualifying years for the State Pension, you need to earn at least the NI lower earnings limit (£6,708 per year in 2026/27). Most salary sacrifice arrangements will not reduce your pay anywhere near this level, but if you work part-time and sacrifice a large percentage of a low salary, it is theoretically possible to fall below the threshold. If in doubt, check your National Insurance record on the GOV.UK website.

Flexibility

Salary sacrifice is a contractual arrangement; you cannot simply change it month to month. Most schemes allow changes once or twice per year (typically at the annual review), or upon a "life event" (marriage, birth of a child, house purchase). This makes it less flexible than relief at source, where you can vary your contributions freely.

If you foresee needing to adjust your contributions regularly (for instance, if your income fluctuates or you are saving for a house deposit), you may prefer to keep a base level of salary sacrifice and top up via relief at source when you can afford to. This hybrid approach gives you the NI saving on the base amount while retaining flexibility for additional contributions.

Salary Sacrifice and Scottish Taxpayers

If you pay Scottish income tax, salary sacrifice works in exactly the same way, but the tax savings differ because Scotland has its own rate bands. The starter rate (19%), intermediate rate (21%), higher rate (42%), advanced rate (45%), and top rate (48%) mean that the income tax saving from sacrifice varies depending on which band your income falls into. The NI saving, however, is the same across the whole of the UK because National Insurance is not devolved.

For example, a Scottish taxpayer earning £45,000 who sacrifices 5% (£2,250) saves at the intermediate rate of 21% on most of that contribution, giving a tax saving of approximately £472, compared to £450 for a rest-of-UK taxpayer at the 20% basic rate. The NI saving of £180 is identical in both cases. See our National Insurance guide for more on how NI applies across the UK.

Common Mistakes to Avoid

Confusing salary sacrifice with personal contributions: Under salary sacrifice, you do not receive tax relief on your contribution because the money was never taxed. Do not attempt to claim relief at source or via self-assessment on sacrificed amounts; this would be double-counting.
Forgetting to claim higher rate relief without sacrifice: If you are a higher rate taxpayer using relief at source (not salary sacrifice), your pension provider only claims 20% basic rate relief automatically. You must claim the additional 20% through self-assessment. Many higher rate taxpayers miss this, losing hundreds or thousands of pounds per year.
Sacrificing too much: Enthusiasm for pension saving is admirable, but sacrificing so much that you struggle with day-to-day expenses defeats the purpose. Work out your monthly budget using the Take-Home Pay Calculator before committing to a high sacrifice percentage.
Ignoring the annual allowance: If your employer also makes generous contributions, the combined total could breach £60,000. Monitor your total contributions carefully.
Not reviewing annually: Your salary, tax band, and personal circumstances change over time. Review your sacrifice level at every annual window to ensure it still suits your situation.

Step-by-Step: How to Set Up Salary Sacrifice

Check availability: Ask your HR or payroll department whether your employer offers a salary sacrifice pension scheme.
Understand the terms: Read the scheme documentation carefully. Note when you can change your contribution, whether employer NI savings are passed on, and how benefits like life insurance are calculated.
Model the numbers: Use the Pension Contribution Calculator to compare sacrifice versus relief at source at your salary level.
Choose your percentage: Decide how much you want to contribute. Remember that your employer's minimum contribution (typically 3%) continues on top of your sacrifice.
Complete the paperwork: Sign the salary sacrifice agreement. This is a variation to your employment contract.
Check your first payslip: Verify that your gross salary has been reduced and that the pension contribution appears as an employer contribution.

Who Should Use Salary Sacrifice?

Basic rate taxpayers (£12,570 - £50,270): Save 8% NI on every pound sacrificed. Worth doing for the NI saving alone.
Higher rate taxpayers (£50,270 - £100,000): Save 2% NI. The saving is smaller, but still free money. You also get the convenience of automatic higher rate tax relief without needing to claim via self-assessment.
Earners £100,000 - £125,140: Potentially enormous savings due to the personal allowance taper. This is the most tax-efficient use of salary sacrifice.
Anyone whose employer passes through employer NI savings: Additional free pension contributions.

Who Should Avoid Salary Sacrifice?

Low earners near minimum wage: If sacrifice would take your pay below minimum wage, it's not allowed.
People about to apply for a mortgage: The reduced P60 salary could limit borrowing capacity.
Pregnant employees: If sacrifice reduces your salary below the SMP qualifying threshold, you could receive less maternity pay. Consider temporarily reducing or pausing sacrifice before the qualifying period for Statutory Maternity Pay begins.
Employees expecting redundancy: If your employer calculates redundancy pay on post-sacrifice salary, your payout could be lower. Check your contract terms.

Frequently Asked Questions

Can I combine salary sacrifice with additional voluntary contributions?

Yes. You can sacrifice part of your salary and also make separate personal contributions via relief at source if you wish. Both count towards your annual allowance. This can be useful if you want a guaranteed base sacrifice plus the flexibility to top up in months when you have spare cash.

Does salary sacrifice affect my student loan repayments?

Yes. Student loan repayments are based on your gross income after sacrifice. If salary sacrifice reduces your gross pay below the relevant repayment threshold (for example, £29,385 for Plan 2 in 2026/27), your repayments will reduce or stop entirely. This could be a benefit or a drawback depending on your perspective: lower repayments mean more take-home pay now, but it takes longer to clear the loan. See our student loan guide and the Student Loan Calculator for more detail.

What happens if I leave my employer?

When you leave, the salary sacrifice arrangement ends. Your pension pot remains yours and is not affected. If you move to a new employer, you will need to set up a new arrangement with them, assuming they offer salary sacrifice. Your new employment contract will be based on whatever salary you negotiate, not the post-sacrifice figure from your old role.

Is salary sacrifice the same as auto-enrolment?

No. Auto-enrolment is the legal requirement for employers to enrol eligible workers into a workplace pension. Salary sacrifice is an optional arrangement for how contributions are made. You can be auto-enrolled into a pension that uses either relief at source or salary sacrifice; it depends on your employer's scheme. See the PAYE guide for more on how payroll deductions work.

Calculators

Pension Contribution Calculator: Compare sacrifice vs relief at source
Salary Calculator: See pension impact on take-home pay
Take-Home Pay Calculator: Full breakdown with pension
Income Tax Calculator: Understand your income tax liability
National Insurance Calculator: Check your NI contributions
Student Loan Calculator: See how sacrifice affects repayments