Announced at the Autumn Budget 2025 and legislated through the National Insurance Contributions (Employer Pensions Contributions) Bill, the cap takes effect on 6 April 2029. That is nearly three years away, which is precisely why it belongs on the agenda now.
Salary sacrifice arrangements are contractual variations to terms and conditions. Unwinding or restructuring them across a workforce is not a payroll setting; it is a consultation exercise.
What exactly is changing?
From 6 April 2029, only the first £2,000 of employee pension contributions made through salary sacrifice each tax year will be exempt from Class 1 National Insurance. Anything above that is treated as earnings for NIC purposes, attracting both employer and employee contributions.
Three things are not changing, and they matter:
- income tax relief on pension contributions is unaffected
- employer contributions made outside a sacrifice arrangement remain free of NIC
- salary sacrifice is not restricted or prohibited. The tax outcome simply changes above the threshold
The Treasury estimated £32 billion of pension contributions used salary sacrifice in 2024. The OBR expects the measure to raise £4.7 billion in 2029/30.
Who is actually affected?
Anyone sacrificing more than £2,000 a year, which is a smaller group than the headlines suggest but a well-paid one.
An employee earning £35,000 and contributing 5% sacrifices £1,750 — below the cap, unaffected. An employee earning £60,000 contributing 8% sacrifices £4,800, of which £2,800 falls above the cap. At current rates that is roughly £224 of additional employee NIC and £420 of additional employer NIC each year, for one person.
Scale that across a professional services firm or a business with a generous scheme and the employer cost becomes a budget line rather than a rounding error.
Maximum saving under the new regime, per employee: £300 for the employer and £160 for the employee.
What should employers do between now and 2029?
Quantify it. Run your current sacrifice population against the £2,000 threshold and calculate the employer cost at 15%. You cannot make a decision about something you have not sized.
Check your contracts. Look at how sacrifice is documented and what notice or consultation is required to vary it. This is the item with the longest lead time and the one most often discovered late.
Review the wider benefits package. If salary sacrifice becomes less efficient above the cap, the relative attractiveness of other structures changes. That is a design question worth taking slowly.
Budget for payroll changes. Software will need updating to track the cumulative £2,000 per employee per tax year, including for joiners and leavers part way through a year.
Do not overreact. Below £2,000 the position is unchanged, and even above it, sacrifice still delivers the same income tax outcome. This is a reduction in an advantage, not the end of one.
Is there anything to do before 2029?
There is an argument that the years to April 2029 are the last in which sacrifice is fully efficient, and some employers will encourage take-up accordingly.
That logic holds for employees who would benefit from higher contributions anyway. It is a poor reason on its own to push someone into sacrificing more than they can afford, and the detailed rules are not yet final. Sensible planning, not a rush.
Frequently asked questions
When does the £2,000 salary sacrifice cap start?
6 April 2029. It was announced at the Autumn Budget 2025 and legislated through the National Insurance Contributions (Employer Pensions Contributions) Bill, introduced in December 2025.
Does the cap affect income tax relief on pensions?
No. Only the National Insurance treatment changes. Income tax relief on pension contributions continues to be governed by the existing annual allowance rules.
How much will the cap cost an employer?
Employer Class 1 NIC at 15% on the amount each employee sacrifices above £2,000 a year. For an employee sacrificing £4,800, that is around £420 annually. The maximum remaining saving is £300 per employee per year.
Should we stop offering salary sacrifice?
For most employers, no. Sacrifice remains NIC-free on the first £2,000 and the income tax treatment is unchanged. The sensible response is to quantify the cost above the cap, check what your contracts require to vary the arrangement, and make a considered decision well before 2029.
Does the cap apply per employee or per employer?
Per employee, per tax year. Payroll systems will need to track the cumulative sacrificed amount for each individual, including part-year joiners and leavers.