Salary sacrifice, also called salary exchange, is an arrangement where an employee agrees to give up part of their gross salary, and the employer pays that amount directly into their pension. Because the contribution does not count as taxable pay, both the employee and the employer pay less National Insurance, and the employee pays less income tax. It is one of the most tax-efficient ways to save into a pension in the UK, and it is fully approved and recognized by HMRC.
How It Works
Under a standard pension contribution, an employee earns their full salary, pays income tax and NICs on it, and then puts the remainder into their pension. The pension provider adds back tax relief, but the NICs already paid are gone. Salary sacrifice works differently. The sacrificed amount goes into the pension before tax or NICs are even calculated, meaning the employee’s taxable pay is lower from the start.
The employer updates the employment contract to reflect the reduced salary, and the employee must formally agree to this change. It is a legal variation of the contract, not just a payroll instruction. Both sides need to be clear on what the new cash entitlement is and what the employer is contributing to the pension in its place.Under a standard pension contribution, an employee earns their full salary, pays income tax and NICs on it, and then puts the remainder into their pension. The pension provider adds back tax relief, but the NICs already paid are gone. Salary sacrifice works differently. The sacrificed amount goes into the pension before tax or NICs are even calculated, meaning the employee’s taxable pay is lower from the start.
Example: Employee earning £40,000, contributing £2,000
Both routes put £2,000 into the pension, but they get there in very different ways, and seeing the actual cash flow makes this much clearer.
Standard contribution. The employee receives the full £40,000 salary. Tax and NIC are calculated on that full amount. Once the money lands in their bank account, they then personally transfer £2,000 of it into their pension. So the £2,000 going into the pension has already been taxed once as part of their salary, and only afterward do they decide to put it away.
Salary sacrifice. The employee’s contractual salary is reduced to £38,000. The £2,000 that has been sacrificed never reaches their bank account at all; it goes straight into the pension as if it were an employer contribution. Because their taxable salary is now £38,000 instead of £40,000, they pay £400 less income tax and £160 less employee NIC than they would have on the full £40,000, a total of £560 less tax and NIC overall.
Here is the side-by-side comparison, showing what actually happens to the employee’s money:
The £2,000 ends up in the pension either way. The only thing that changes is how much tax and NIC the employee paid along the way. Under salary sacrifice, that £2,000 never counted as taxable income in the first place, so the employee avoids paying £560 in tax and NIC that they would otherwise have paid under the standard route. That £560 is the actual saving, and it shows up as extra cash staying in the employee’s pocket compared to contributing the same £2,000 the standard way, not as a comparison against not contributing to a pension at all.
The Tax Rates Behind the Savings (2026/27)
Income tax rates for England, Wales, and Northern Ireland are 20% at the basic rate, 40% at the higher rate, and 45% at the additional rate, with a personal allowance of £12,570. The personal allowance has been frozen at this level since April 2022 and will remain so until at least April 2031. Employee NICs are 8% on earnings between £12,570 and £50,270, and 2% on earnings above that. Employer NICs are 15% on earnings above the £5,000 secondary threshold. HMRC confirms all rates are unchanged from 2025/26. Scotland has its own income tax bands and rates.
How much you personally save through salary sacrifice depends on your tax band, as income tax and NIC rates vary with your earnings. To make this easy to picture, here is what someone saves for every £1,000 they sacrifice, broken down by tax band.
Saving per £1,000 sacrificed
A basic rate taxpayer is simply anyone whose income falls below £50,270. For this group, sacrificing £1,000 saves £200 in income tax (20%) and £80 in employee NIC (8%), for a combined saving of £280 per £1,000 sacrificed.
A higher rate taxpayer is anyone earning above £50,270. Once you cross that line, your employee NIC rate drops from 8% down to 2%, which is why the NIC saving in the table looks smaller for higher earners, even though their income tax saving is larger. This is just how the NIC system works above that threshold, not an error. So for someone safely above £50,270, sacrificing £1,000 saves £400 in income tax (40%) and £20 in NIC (2%), for a total of £420. One thing worth knowing: if your salary sits only just above £50,270, part of your sacrifice might still technically fall within the 8% NIC band rather than the 2% band, which would make your actual saving slightly higher than the table shows. This only matters if you are very close to that £50,270 line.
To put this into a real-world figure, a basic rate taxpayer sacrificing £2,000 a year, twice the £1,000 example above, would save £560 in tax and NIC combined. A higher rate taxpayer sacrificing the same £2,000, assuming their income is comfortably above £50,270, would save £840. These are genuine cash savings, and depending on your employer’s policy, this money either stays in your own pocket as higher take-home pay or gets added on top of your pension contribution if your employer chooses to pass on their own NIC savings as well.
The Employer Saving
The employer benefit is often overlooked but significant. By reducing an employee’s contractual salary, the employer pays less in employer NICs at 15%. With a £2,000 salary sacrifice, the employer saves approximately £300, assuming the employee’s earnings are comfortably above the £5,000 secondary threshold, since employer NIC is only charged on earnings above that level. For most employees on a typical salary, this assumption holds easily. Still, for someone earning very close to £5,000 a year, part or all of the sacrificed amount may fall below the threshold, in which case the employer’s actual saving could be lower than £300, or in rare cases, nil.
Many employers pass some or all of this saving back to the employee by adding it to the pension contribution, a practice sometimes called an NI augmentation or employer NI pass-through. Where this happens, the pension pot receives more than the original £2,000 at no additional cost to the business. It is one of the few arrangements in which both the employer and the employee genuinely benefit simultaneously.
Key Rules to Know
The arrangement must be properly documented in the employment contract. The employee must agree to the change, and the contract must clearly state their cash salary and what the employer is contributing instead of it. Employees cannot freely switch in and out of the arrangement at will. If they do, HMRC will not apply the expected tax and NIC advantages. Changes are generally permitted only for specific lifestyle events, such as marriage, divorce, a partner becoming redundant, or a partner becoming pregnant. This is not an exhaustive list, and HMRC may also accept other lifestyle events depending on the circumstances.
The arrangement cannot reduce an employee’s cash pay below the National Minimum Wage. Employers must have procedures in place to cap salary sacrifice deductions to make sure this does not happen. Pension contributions into a registered scheme are specifically exempt from the requirement to value and report a non-cash benefit to HMRC, and no income tax or NICs are charged on employer contributions to a registered pension scheme.
Total pension contributions from all sources, including employee, employer, and any third party, are subject to the annual allowance of £60,000 for 2026/27, or 100% of earnings if that is lower. Higher earners with adjusted income above £260,000 face a tapered allowance that reduces by £1 for every £2 of income above that threshold, down to a minimum of £10,000.
Effects on Other Benefits
Because your contractual salary is genuinely lower under salary sacrifice, it can affect several salary-linked entitlements that are worth understanding before you sign up.
Statutory payments such as Statutory Maternity Pay and Statutory Sick Pay are based on average weekly earnings. If the reduced salary brings average weekly earnings below the Lower Earnings Limit of £129 per week (£6,708 per year) for 2026/27, the employer is not required to make any statutory payments. State Pension qualifying years also depend on earnings exceeding this limit, so any salary sacrifice that takes pay below this level could affect your State Pension record.
Mortgage lenders may assess affordability by reference to the reduced contractual salary after salary sacrifice. However, some lenders may take into account the employee’s notional pre-sacrifice salary where the employer confirms it. As a result, salary sacrifice can potentially reduce the amount that can be borrowed, depending on the lender’s policy. Salary-linked benefits, such as life insurance or income protection, may also be affected if they are calculated by reference to post-sacrifice contractual salary. However, some schemes use notional salary instead. For pension contributions, employers often use notional pre-sacrifice salary so that employees are not disadvantaged, but this depends on the employer’s policy and pension scheme rules, and should be confirmed before entering into the arrangement.
Conclusion
Salary sacrifice is a straightforward, HMRC-approved method that makes pension saving more efficient for both employers and employees. Employees reduce their income tax and NIC liability, employers reduce their NIC costs, and with a sensible pass-through arrangement, more money reaches the pension than would under a standard contribution. For most employees, it is the smarter route, provided the implications for statutory pay, the State Pension, and any salary-linked borrowing or insurance are understood and planned for in advance.
