Pension guide
How does pension salary sacrifice work?
Salary sacrifice — sometimes called salary exchange — is an arrangement where you agree to give up part of your salary or bonus and your employer pays that amount into your pension instead.
The basics
Salary is exchanged for an employer pension contribution.
Under a pension salary-sacrifice arrangement, your contractual cash salary is reduced and your employer pays an additional employer pension contribution instead.
Because the pension contribution is treated as an employer contribution rather than an employee contribution from net pay, the payroll treatment can differ from a normal employee contribution.
Salary sacrifice is not something an employee can set up independently. It normally requires a contractual change agreed between employer and employee.
Potential benefit
Why can salary sacrifice be efficient?
Under current rules, reducing contractual salary in exchange for an employer pension contribution can reduce the earnings on which Income Tax and National Insurance are calculated.
Employee saving
You may pay less National Insurance than if the same pension saving were made from salary in the ordinary way.
Income Tax
The exchanged salary is paid as an employer pension contribution rather than as taxable cash pay.
Employer saving
The employer can also save employer National Insurance on the salary given up under current rules.
Potential pension boost
Some employers choose to add some or all of their National Insurance saving to the employee's pension.
Employer treatment
Ask what your employer does with its National Insurance saving.
Employers do not have to pass their National Insurance saving to employees. Some keep it, some share part of it and some add the full saving to the pension contribution.
This means two employers offering “salary sacrifice” can produce different pension outcomes even where the employee gives up the same amount of salary.
Possible drawbacks
A lower contractual salary can affect more than your payslip.
MoneyHelper and HMRC both highlight that salary sacrifice can affect earnings-related benefits and payments, depending on how the employer calculates them.
Mortgage affordability
A lower contractual salary can affect how some lenders assess income.
Statutory payments
Statutory maternity, paternity or sickness-related payments can be affected in some circumstances.
Employer benefits
Life cover, bonuses, overtime or other benefits linked to salary may be based on either notional or reduced salary depending on employer rules.
National Minimum Wage
Salary sacrifice cannot reduce cash earnings below the applicable National Minimum Wage.
Some employers continue to calculate benefits such as life cover or pay reviews using the pre-sacrifice salary, while others use the reduced contractual salary.
Important future change
National Insurance treatment changes from 6 April 2029.
From 6 April 2029, only the first £2,000 a year of employee pension contributions made through salary sacrifice will remain exempt from employee and employer National Insurance. Salary sacrifice above that level can continue, but National Insurance will apply to the excess.
The Government has confirmed that Income Tax relief on pension contributions will continue under the normal pension rules. Traditional employer pension contributions that are not generated by salary sacrifice will also continue to receive their existing National Insurance treatment.
Further operational detail is expected before the new regime starts, so arrangements should be reviewed again closer to April 2029.
Before opting in
Six things to check with your employer.
1. Your new salary
Confirm the contractual salary after sacrifice and whether there are minimum or maximum limits.
2. Pension amount
Confirm exactly how much the employer will pay into the pension.
3. Employer NI saving
Ask whether any of the employer's saving will be added to your pension.
4. Other benefits
Check how bonuses, life cover, overtime, pay rises and statutory payments are calculated.
5. Pension allowances
Employer contributions still count towards your annual allowance and can interact with tapering or the MPAA.
6. Future rule change
If contributions are significant, understand how the April 2029 National Insurance reform may affect the benefit.
Personal pension planning
Considering increasing pension contributions through salary sacrifice?
A pension review can consider the contribution level, annual allowances and retirement objective, while your employer or payroll team can confirm the salary-sacrifice terms available to you.
Book a conversationThis guide is for general information only and is not personal financial, tax, employment or payroll advice. Salary-sacrifice, pension and National Insurance rules can change and employer arrangements differ. Content checked against current HMRC, HM Treasury and MoneyHelper guidance on 15 September 2026.