Salary sacrifice is an agreement where an employee gives up part of their salary or bonus in return for a non-cash benefit. For workplace pensions, the employer usually pays the sacrificed amount into the pension as an employer contribution.
How salary sacrifice works
With salary sacrifice, you agree to reduce your cash salary. In return, your employer provides a benefit. For pension salary sacrifice, the employer pays the sacrificed amount into your pension.
Because your salary is reduced before payroll deductions, salary sacrifice can affect PAYE Income Tax, National Insurance and net pay.
before salary sacrifice:
salary paid as cash → employee pension contribution
with salary sacrifice:
lower cash salary → employer pension contribution
Salary sacrifice for pensions
Pension salary sacrifice is one of the most common uses. Instead of making a normal employee pension contribution from pay, you give up salary and the employer pays the equivalent amount into the pension.
This can be efficient because the sacrificed amount is normally treated as employer pension contribution rather than cash salary. Under current pre-2029 rules, this can reduce employee and employer National Insurance.
Part of cash pay is contractually reduced.
The amount goes into the pension as employer contribution.
Tax and NI may be calculated on reduced pay.
Compare pension methods
Read the full guide comparing salary sacrifice with normal pension contributions.
How salary sacrifice affects tax and National Insurance
Salary sacrifice can reduce taxable pay and National Insurance-able pay because you have agreed to receive less cash salary. The result can be a smaller reduction in take-home pay than the amount going into the pension.
The exact result depends on salary, contribution level, pension scheme, employer setup, student loan position and whether the employer shares any employer National Insurance saving.
If you sacrifice £100 of gross salary into a pension, your take-home pay may fall by less than £100 because tax and National Insurance can be calculated on lower pay.
Salary sacrifice pension changes from April 2029
From April 2029, only the first £2,000 of employee pension contributions made through salary sacrifice each year will remain exempt from National Insurance contributions. Contributions above that annual amount will be subject to employer and employee National Insurance, while the Income Tax treatment remains separate.
Salary sacrifice can still be useful, but large pension salary sacrifice contributions may have a smaller National Insurance advantage after the rule change.
Planning point: if you use salary sacrifice for large pension contributions, check how your employer will apply the April 2029 changes.
Potential benefits of salary sacrifice
Salary sacrifice can be helpful when it is suitable and properly understood.
- Can reduce employee National Insurance under current pre-2029 pension rules.
- Can increase the efficiency of pension saving.
- Can make pension contributions feel less expensive from take-home pay.
- Some employers may share part of their employer NI saving as extra pension contribution.
- Can reduce adjusted net income, which may matter for some tax thresholds and benefits.
Risks and things to check
Salary sacrifice reduces contractual salary, so it is not only a tax calculation. Check how your employer treats salary-linked benefits and statutory payments.
- Minimum wage: sacrifice should not reduce pay below National Minimum Wage rules.
- Mortgage checks: some lenders may look at post-sacrifice salary or payslips.
- Statutory pay: maternity, paternity, sick and other statutory payments can depend on average earnings.
- Salary-linked benefits: bonus, overtime, life cover or redundancy may use salary definitions.
- Contract terms: salary sacrifice is usually a contractual change.
- Future rules: pension salary sacrifice NICs treatment changes from April 2029.
Salary sacrifice vs normal pension contribution
A normal pension contribution is usually treated as an employee contribution. Salary sacrifice is different because the employer makes the pension contribution after salary has been reduced.
Normal pension contribution
An employee contribution is deducted from pay or paid net and topped up with tax relief, depending on scheme method.
Salary sacrifice pension
Salary is reduced and the employer pays the sacrificed amount into the pension as employer contribution.
Calculate the take-home pay effect
Use the take-home pay calculator to compare a normal pension contribution against a salary sacrifice pension setup. Change the pension method and compare the net pay result.
Compare salary sacrifice and normal pension
Estimate take-home pay after tax, NI, pension and student loan deductions.
Salary sacrifice FAQs
What is salary sacrifice in simple terms?
It is an agreement to give up part of salary or bonus in return for a non-cash benefit, such as an employer pension contribution.
Does salary sacrifice reduce gross pay?
Yes. It reduces contractual cash salary, which can affect payroll calculations and some salary-linked checks.
Does salary sacrifice save National Insurance?
Under current pre-2029 pension rules, it can reduce employee and employer National Insurance. From April 2029, the NI advantage for pension salary sacrifice will be limited above £2,000 a year.
Can salary sacrifice affect mortgage applications?
It can. Some lenders may look at payslips or post-sacrifice salary, so check before making large changes if you plan to borrow soon.