Is salary sacrifice worth it? How much you actually save

Salary sacrifice saves National Insurance that the other pension methods do not

Salary sacrifice is worth it for most employees because it cuts your National Insurance as well as your Income Tax, while the other two ways of paying into a workplace pension only cut Income Tax. According to HMRC, a salary sacrifice arrangement is an agreement to reduce your cash pay in return for a non-cash benefit, such as your employer paying the same amount into your pension.

The three methods treat a pension contribution differently:

• Salary sacrifice: your contractual salary falls, so Income Tax, National Insurance and student loan repayments are all worked out on the lower figure.
• Net pay arrangement: the contribution comes out of your pay before Income Tax, but National Insurance and student loan repayments are still worked out on your full salary.
• Relief at source: you pay from pay that has already been taxed, and the pension provider claims 20% basic rate relief from HMRC and adds it to your pot. Higher and additional rate taxpayers claim the rest themselves, through Self Assessment or by contacting HMRC.

For 2026/27 employee National Insurance is 8% on pay between £12,570 and £50,270 and 2% above that, so the extra saving from salary sacrifice is 8p or 2p for each £1 sacrificed. According to HMRC, the contribution your employer makes into a registered pension scheme carries no Income Tax or National Insurance charge for you.

How much salary sacrifice saves at £35,000, £60,000 and £110,000

Salary sacrifice saves a basic rate taxpayer 8% of the amount sacrificed compared with net pay or relief at source, and a higher rate taxpayer 2%. The figures below come from our UK take-home pay calculator engine for the 2026/27 tax year, with a 5% employee contribution, the standard 1257L tax code, England, Wales or Northern Ireland tax bands and no student loan. The cost is how much your yearly take-home pay falls compared with paying nothing into the pension. For relief at source it is net of the higher rate relief you claim back.

Worked example at £35,000

With no pension, a £35,000 salary gives £28,719.60 a year after £4,486 Income Tax and £1,794.40 National Insurance. Sacrificing £1,750 cuts Income Tax to £4,136 and National Insurance to £1,654.40, leaving £27,459.60. Your take-home falls by £1,260, yet £1,750 goes into the pension, so each £1 in the pot costs you 72p. Under net pay the same £1,750 costs £1,400, or 80p per £1.

Why the £110,000 figure is so low

At £110,000 each £1 sacrificed costs only 38p because it also restores part of the Personal Allowance, which gives a 62% marginal tax rate in that band. The section on the £100,000 taper shows the full effect.

Relief at source and net pay cost the same in the end for a basic rate taxpayer. For higher rate taxpayers relief at source only matches net pay if you claim the extra relief. According to HMRC, you claim the extra relief through your tax return if you complete Self Assessment, or otherwise through your tax code. It is not added to your pay automatically.

Salary sacrifice also cuts student loan repayments

Salary sacrifice lowers student loan repayments because they are worked out on the same pay as National Insurance, which is your salary after the sacrifice. According to GOV.UK, Plan 2 borrowers repay 9% of income over £29,385 a year, so each £1 sacrificed saves a further 9p for anyone earning above the threshold. Net pay and relief at source do not change your repayment.

At £35,000 on Plan 2 with a 5% contribution, the engine gives these figures:

Salary sacrifice is £297.50 a year cheaper here: £140 of National Insurance and £157.50 of student loan. That makes each £1 in the pension cost 63p. The catch is that a smaller repayment leaves more of the loan outstanding. For a Plan 2 loan that is likely to be written off before it is repaid, that rarely matters; if you expect to clear the loan, you are deferring repayments rather than avoiding them.

Salary sacrifice can reduce the Child Benefit charge and the £100,000 taper

Salary sacrifice reduces your adjusted net income, which is the figure that decides both the High Income Child Benefit Charge and the loss of your Personal Allowance above £100,000. Net pay and relief at source contributions reduce it too. According to HMRC, relief at source contributions are taken off at their grossed-up amount, which is £1.25 for every £1 you pay.

The Child Benefit charge between £60,000 and £80,000

According to GOV.UK, you pay back 1% of your Child Benefit for every £200 of adjusted net income over £60,000, and all of it at £80,000 or more. A parent on £70,000 repays 50% of the family's Child Benefit. Sacrificing £10,000 brings adjusted net income down to £60,000, so the charge falls to nil and the family keeps all of its Child Benefit, on top of the tax and National Insurance saved. According to GOV.UK, employees who sacrifice salary to keep Child Benefit can continue to do so after April 2029.

The Personal Allowance taper above £100,000

According to GOV.UK, your Personal Allowance goes down by £1 for every £2 of adjusted net income above £100,000, reaching zero at £125,140. Using the take-home pay calculator engine for a £110,000 salary with £10,000 sacrificed:

• Income Tax falls from £33,432 to £27,432, a saving of £6,000, because the full £12,570 Personal Allowance comes back.
• National Insurance falls from £4,210.60 to £4,010.60, a saving of £200.
• Take-home pay falls by only £3,800, from £72,357.40 to £68,557.40, while £10,000 goes into your pension.

Under net pay the same £10,000 costs £4,000; under relief at source it costs £8,000 up front, and you get £4,000 back only after claiming it through Self Assessment. To test your own pay rise or bonus against the taper, use the pay rise calculator, which shows how much of each extra £1 you keep.

From April 2029 only the first £2,000 a year is free of National Insurance

From April 2029, only the first £2,000 a year of employee pension contributions made through salary sacrifice will be exempt from National Insurance. According to GOV.UK, contributions above £2,000 will pay both employee and employer National Insurance, but all salary sacrifice pension contributions stay free of Income Tax within the usual limits, and employer pension contributions stay free of National Insurance.

So the Income Tax, Child Benefit and £100,000 taper benefits stay after April 2029, but the National Insurance saving on the amount above £2,000 goes. Using 2026/27 rates as a guide, since the rates for 2029/30 are not yet known:

The bigger change is on the employer's side. According to HMRC, employer National Insurance for 2026/27 is 15% above a secondary threshold of £5,000 a year. If your employer adds some or all of its National Insurance saving to your pension, that top-up will shrink on the amount above £2,000: in the £110,000 example, employer National Insurance on £8,000 is £1,200 a year at 15%. HMRC will publish further guidance before April 2029, so check how your own employer plans to handle it.

The downsides: mortgages, statutory pay and the minimum wage

Salary sacrifice lowers your contractual salary, and anything worked out from that salary can fall with it. These are the effects to check before you sign up.

Statutory maternity pay and similar payments

According to HMRC, salary sacrifice can reduce the statutory pay you receive and can remove the entitlement altogether if your average weekly earnings fall below the lower earnings limit. According to HMRC, the lower earnings limit for 2026/27 is £129 a week, and Statutory Maternity Pay is 90% of average weekly earnings for the first 6 weeks, then £194.32 or 90% of earnings if lower. A £35,000 salary with a £1,750 sacrifice has average weekly earnings of about £639 rather than £673, so the first 6 weeks of pay fall by about £30 a week. Many employers let you pause the arrangement or use your pre-sacrifice salary for their own enhanced maternity pay, so ask HR before the period used to set your average earnings.

Other earnings-related benefits

According to HMRC, salary sacrifice can affect earnings-related benefits such as Maternity Allowance, and contribution-based benefits and the State Pension if it cuts the earnings on which National Insurance is charged. That only bites if your pay after sacrifice falls close to the lower earnings limit.

Mortgage applications and salary-linked benefits

A mortgage lender may assess affordability on your reduced salary, not the pre-sacrifice figure. Check what your payslip and employer's reference will show, and ask the lender which figure it uses. Life cover, overtime rates and pay rises may also be based on the lower salary unless your employer uses a notional salary, which HMRC says employers often do for pension contributions. You can model the pay a lender would see with the salary calculator.

The minimum wage floor

According to HMRC, a salary sacrifice arrangement must not take your cash earnings below the National Minimum Wage rates, and employers must cap deductions to keep them above it. If you are close to the minimum wage, your employer may limit or refuse the sacrifice, and net pay or relief at source is the route that remains.

When salary sacrifice is worth it and when it is not

Salary sacrifice is worth it for most employees who are already paying into a workplace pension and earn comfortably above the lower earnings limit, because it saves 8% or 2% on top of the Income Tax relief. It is especially good value if:

• you repay a Plan 1, 2, 4 or 5 student loan, which adds a 9% saving above the threshold;
• your adjusted net income is between £60,000 and £80,000 and you claim Child Benefit;
• your adjusted net income is between £100,000 and £125,140, where each £1 sacrificed costs 38p;
• your employer adds its own National Insurance saving to your pension.

Think twice if you are planning maternity or paternity leave in the next year, applying for a mortgage in the next few months, or earn close to the National Minimum Wage. In those cases the lower contractual salary can cost more than the 8% or 2% you save. If you are in any of these groups, run your figures through the take-home pay calculator with each pension method before you decide.