Salary Sacrifice Pensions
By Mustafa Bilgic · Updated 24 August 2026
Salary sacrifice for pension contributions saves you National Insurance that a standard pension contribution cannot. Your employer reduces your contractual salary, pays the difference into your pension, and both sides avoid NI on that amount. The trade-off is a lower gross salary on paper, which can affect mortgage applications and certain state benefits. Use our salary sacrifice calculator to see the actual pound-for-pound difference.
Salary sacrifice is one of the few ways to avoid NI on pension contributions. The calculator shows the exact saving on your pay level.
How Salary Sacrifice Saves NI
Under a standard pension contribution, your employer deducts the amount from your net pay after NI has already been charged. You still get income tax relief -- either at source or through self-assessment -- but National Insurance is gone. Salary sacrifice reverses the order. Your contractual salary drops first, and the pension contribution is made by your employer. Because the contribution never counts as your earnings, neither you nor your employer pays NI on it.
The employer's NI saving is real money too. Some employers pass part or all of their saving into your pension pot as an additional contribution, effectively giving you a bonus for choosing sacrifice. Ask your HR department whether this applies -- it varies by employer and is not guaranteed. Run both scenarios in our salary sacrifice calculator to see the net difference on your specific salary.
The Mortgage and Benefits Trade-Off
Mortgage lenders assess affordability based on your gross salary. If salary sacrifice drops your contractual pay from one figure to a lower one, some lenders will use the reduced number, shrinking the amount you can borrow. Others accept a letter from your employer confirming your pre-sacrifice salary. Ask your mortgage broker which lenders take which approach before you commit to a sacrifice arrangement near the start of a property purchase.
State benefits linked to earnings -- statutory maternity pay, statutory sick pay, and contribution-based Jobseeker's Allowance -- use your reduced salary as the reference point. If sacrifice takes your pay below the Lower Earnings Limit, you could lose entitlement to the State Pension for that year. Your employer should not allow sacrifice below National Minimum Wage, and a good payroll department will flag this automatically, but check your payslip to be sure.
Who Benefits Most
Higher and additional-rate taxpayers gain the most in absolute terms because their NI saving sits on top of higher-rate tax relief they would receive anyway. Basic-rate taxpayers still benefit, though the NI saving alone may be modest on a small sacrifice amount. The tipping point is whether the NI saving outweighs any negative impact on benefits or borrowing capacity.
Salary sacrifice is particularly powerful for employees just above the higher-rate threshold. Reducing gross pay back below that threshold means the portion sacrificed avoids both higher-rate tax and NI. Combine that with employer NI pass-through and the pension pot grows faster than almost any other low-risk route. If you are close to retirement and maximising pension contributions, the annual allowance still applies to salary sacrifice -- it does not create a loophole around the cap.
Setting It Up and Opting Out
Salary sacrifice is a contractual change, not a payroll toggle. You and your employer sign a variation to your employment contract that reduces your salary by the agreed amount. Most employers offer annual windows to change the amount, with ad-hoc changes allowed only for life events such as marriage or a new child.
Opting out restores your gross salary to its original level (adjusted for any pay rises since), but it does not refund the NI saved in previous months. If you are considering sacrifice, start with an amount you are comfortable locking in for a year. You can always increase it at the next window. This guide is for information purposes only and does not constitute financial advice.
Not tax advice -- speak to your accountant.
Frequently asked questions
Does salary sacrifice reduce my income tax as well as NI?
Yes. Because your gross salary is contractually lower, you pay income tax on the reduced amount. The pension contribution is made by the employer, so it is never part of your taxable income.
Can salary sacrifice take me below minimum wage?
No. Your employer must ensure your post-sacrifice hourly pay does not fall below the National Minimum Wage or National Living Wage for your age group. If sacrifice would breach this floor, the arrangement must be capped.
Does my employer have to offer salary sacrifice?
There is no legal requirement. Salary sacrifice is a voluntary arrangement that the employer chooses to make available. If your employer does not offer it, your alternative is a standard employee pension contribution with tax relief but no NI saving.
Will salary sacrifice affect my student loan repayments?
Yes. Student loan repayments are calculated on gross pay after sacrifice, so your monthly repayment will be lower. Over time, this means you repay the loan more slowly, which may or may not suit your financial plan.