How Salary Sacrifice Saves You Tax and National Insurance

Salary sacrifice reduces your gross salary before income tax and National Insurance are calculated. Every pound you sacrifice costs less than a pound to put in your pension — how much less depends on your tax rate.

Last updated: 17 May 2026

What salary sacrifice is

Your employer and you agree to reduce your gross salary by an amount — usually a pension contribution. Instead of paying that amount to you as salary, your employer pays it directly to your pension on your behalf.

Because HMRC sees a lower gross salary, income tax and National Insurance are calculated on the smaller figure. You pay both on less. The pension still receives the full amount.

This is different from making a personal pension contribution after you have been paid. With a personal contribution, you still pay full NI on your original salary and then claim income tax relief separately. Salary sacrifice saves both at source — which is why it is more efficient.

The two savings: income tax and National Insurance

Every pound sacrificed avoids tax at two rates simultaneously:

Income tax relief

Saved at your marginal income tax rate: 20% (basic), 40% (rUK higher), 42% (Scottish higher), 45% (advanced/additional), 48% (Scottish top). The higher your rate, the more you save.

National Insurance saving

Saved at 8% on earnings between the primary threshold (£12,570) and the upper earnings limit (£50,270). Above £50,270 the NI saving is 2%. NI is UK-wide — the same saving applies in Scotland and England.

Combined, the saving at each tax band looks like this:

Tax band	Income tax saved	NI saved	Total per £1
Basic rate (rUK / Scottish)	20%	8%	28p
Intermediate (Scotland)	21%	8%	29p
Higher rate (rUK 40%)	40%	8%*	~48p
Higher rate (Scotland 42%)	42%	8%	50p
Advanced / Additional (45%)	45%	2%	47p
Scottish top (48%)	48%	2%	50p

*The rUK higher-rate saving on NI depends on whether the sacrificed amount crosses the UEL (£50,270). Income in the £43,663–£50,270 range saves 8% NI; income above £50,270 saves 2% NI.

Try the calculator

Take-home Pay Calculator

Enter your salary and pension sacrifice percentage. See exactly how much your take-home changes and what your pension receives.

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Worked examples

Example 1: basic-rate earner, £35,000 salary

Sacrifice £5,000 into a pension. 2026/27 rUK rates, no student loan, no other income.

	Without sacrifice	With £5,000 sacrifice	Saving
Gross salary	£35,000	£30,000	—
Income tax (20%)	£4,486	£3,486	£1,000
Employee NI (8%)	£1,794	£1,394	£400
Take-home cash	£28,720	£25,120	−£3,600
Pension receives	£0	£5,000	+£5,000

Net cost to you: £3,600. You receive £3,600 less take-home cash but £5,000 goes into your pension. You saved £1,400 in income tax and NI — 28p back for every £1 sacrificed.

Example 2: Scottish higher-rate earner, £47,000 salary

The Scottish higher rate (42%) starts at £43,663. Sacrificing enough to bring gross salary to exactly £43,662 avoids the higher rate entirely on the sacrificed amount. That's a sacrifice of £3,338.

	Without sacrifice	With £3,338 sacrifice	Saving
Gross salary	£47,000	£43,662	—
Scottish income tax	£7,722	£6,320	£1,402
Employee NI (8%)	£2,754	£2,487	£267
Take-home cash	£36,524	£34,855	−£1,669
Pension receives	£0	£3,338	+£3,338

Net cost to you: £1,669. You put £3,338 into your pension and your take-home falls by exactly half that. 50p back for every £1 sacrificed — because the combined IT and NI saving on income in the Scottish higher band is exactly 50%.

This effect is one of the more striking results in the Scotland vs England income tax comparison. At the same salary of £47,000, an English earner is still in the basic-rate band and saves only 28p per £1 sacrificed. The Scottish higher-rate threshold makes pension sacrifice materially more valuable in Scotland at salaries between £43,663 and £50,270.

What your employer saves — and whether you get it back

When your salary falls, your employer's National Insurance bill also falls. For 2026/27 employers pay 15% NI on earnings above £5,000 per year. On the basic-rate example above, the £5,000 sacrifice saves your employer £750 in NI.

That saving belongs to the employer. Many pass some or all of it back as an additional pension contribution — commonly 50% to 100% of the NI saving redirected to your pension on top of your sacrifice. In the example above, that could mean £750 extra reaching your pension at no additional cost to you.

Not every employer does this. Ask HR or check your staff handbook. If they do pass it back, it is worth factoring into your decision about how much to sacrifice.

Other types of salary sacrifice

Pension contributions are by far the most common form of salary sacrifice, but the same mechanism applies to other employer benefits:

Cycle to Work. Buy a bike and equipment through your employer and spread the cost via salary sacrifice. Tax and NI savings apply to the total amount. Schemes typically run for 12 months and the employer often retains ownership until the agreement ends.
Electric vehicle (EV) leasing. Company car schemes using salary sacrifice. EVs have very low Benefit in Kind (BIK) rates (2% for 2026/27), making them unusually tax-efficient through this route. Worth comparing against a personal lease or purchase.
Childcare vouchers (legacy). New entrants to childcare voucher schemes closed in 2018. If your employer still runs one from before that date, you may still be using it. Tax-Free Childcare is the current government scheme for new claimants.
Additional annual leave. Some employers allow you to buy extra leave days via salary sacrifice. Saves tax and NI on the value of the leave days purchased.

Things to watch out for

Minimum wage floor

Your employer cannot reduce your salary below the National Living Wage through salary sacrifice — for workers 21 and over, that is £12.71 per hour for 2026/27. Lower-paid workers may find the amount they can sacrifice is limited or zero. Your employer's payroll system should flag this, but it is worth checking if your salary is close to minimum wage.

Mortgage applications

Most mortgage lenders use your gross salary for affordability calculations. Some use the post-sacrifice figure. If you are planning to apply for a mortgage in the next 12 months, check with a mortgage adviser before increasing your sacrifice level. Reducing your apparent income now could affect how much a lender will offer you, even if your pension is growing.

State Pension and contribution-based benefits

State Pension qualifying years are earned by paying NI above the primary threshold (£12,570). As long as your sacrificed salary stays above that, your State Pension entitlement is unaffected. Some contribution-based benefits — like Employment and Support Allowance — also link to NI contributions. If your earnings are close to the threshold, keep that floor in mind when deciding how much to sacrifice.

The pension annual allowance

For 2026/27, the annual allowance is £60,000 (your contributions plus your employer's combined). Contributions above this attract a tax charge that wipes out the saving. Most people sacrificing to escape the 42% or 60% trap are nowhere near this limit, but higher earners above £260,000 face a tapered annual allowance that reduces it. If your employer also contributes generously, it is worth checking you stay within the cap.

How to request salary sacrifice

Salary sacrifice is set up through your employer — you cannot arrange it yourself. Here is how to go about it:

1 Check if your employer offers it. Most medium and large employers do, especially for pensions. Look in your staff handbook, employee benefits portal, or ask HR.
2 Decide how much to sacrifice. Use the take-home pay calculator to model the impact. Common starting points: enough to reach a round pension contribution percentage, or enough to drop below a rate-band threshold.
3 Complete the agreement. Your employer will ask you to sign a salary sacrifice agreement that alters your contract of employment. Read it before signing — it should state the sacrifice amount, the resulting lower salary, and what the employer contributes to your pension instead.
4 Review it annually. Your salary, tax situation, and priorities change. Review your sacrifice level each tax year, especially if you get a pay rise (which may push you into a new tax band) or are planning a large financial commitment like a mortgage.

If you earn above £100,000, salary sacrifice can also restore your Personal Allowance and escape the 60% (or 67.5% in Scotland) effective marginal rate. The 60% tax trap guide covers that specific case in detail.

Frequently asked questions

What is salary sacrifice?

Salary sacrifice is an agreement between you and your employer to reduce your gross salary by an agreed amount. Your employer pays the equivalent sum directly to your pension (or other benefit). Because your new lower salary is the figure used before income tax and National Insurance are calculated, you pay less of both.

How much does salary sacrifice actually save?

The saving depends on your marginal income tax rate. A basic-rate taxpayer in England saves income tax at 20% plus employee NI at 8% — 28p saved for every £1 sacrificed. A Scottish higher-rate taxpayer saves 42% income tax plus 8% NI — 50p saved for every £1 sacrificed. The saving is larger the higher your tax rate.

Does salary sacrifice affect my mortgage application?

It can. Mortgage lenders assess affordability based on your salary, and some use the post-sacrifice figure rather than your original gross. If you are applying for a mortgage, check with your adviser whether your sacrifice arrangement changes the amount you can borrow before committing to a higher sacrifice level.

Is there a limit on how much I can sacrifice?

Your employer cannot reduce your salary below the National Living Wage (£12.71 per hour for 2026/27 if you are 21 or over). The pension annual allowance of £60,000 for 2026/27 caps total contributions from all sources. Beyond those limits, you can sacrifice as much as you and your employer agree.

Does salary sacrifice reduce my State Pension?

No, provided your salary after sacrifice stays above the NI primary threshold of £12,570. You build State Pension qualifying years through NI contributions, and those continue as long as your earnings are above the threshold. Only if sacrifice brings your salary below £12,570 would State Pension entitlement be affected.