What is changing?
Under the announced rules, the first £2,000 of employee pension contributions made through pension salary sacrifice in a tax year will remain exempt from National Insurance. Salary or bonus sacrificed above that amount will be subject to employee and employer Class 1 National Insurance.
The change applies from 6 April 2029. Employers will account for the National Insurance through payroll and report the relevant sacrificed amounts to HMRC.
Two simple examples
If an employee sacrifices £2,000 into their pension during the tax year, none of that amount would be exposed to National Insurance under the announced limit.
If an employee sacrifices £10,000, the first £2,000 would remain exempt and the remaining £8,000 would be subject to employee and employer National Insurance.
The exact cost will depend on the National Insurance rates and thresholds that apply in 2029/30, which are not yet known.
What will stay the same?
- Pension salary sacrifice arrangements can continue.
- Contributions can exceed £2,000. The figure is a National Insurance exemption limit, not a contribution cap.
- Salary sacrificed into a pension will remain exempt from Income Tax, subject to the usual pension limits.
- Pension salary sacrifice will continue to reduce adjusted net income.
- Ordinary employer pension contributions will continue to be free of National Insurance.
Why adjusted net income still matters
HMRC has confirmed that the reform will not change the effect of pension salary sacrifice on adjusted net income. Salary sacrifice may therefore continue to affect the Personal Allowance taper and income tests for Tax-Free Childcare and certain free childcare schemes.
The change reduces the National Insurance advantage above £2,000. It does not remove the other reasons why someone might consider pension saving or reducing adjusted net income.
Who is expected to be affected?
HMRC estimates that 44% of employees currently using pension salary sacrifice contribute more than £2,000 through those arrangements. The other 56% are expected to remain fully within the announced National Insurance exemption.
People making larger contributions, including some higher earners and employees sacrificing a bonus, are more likely to be affected.
Some details are still to come
The core policy and planned start date have been announced, but detailed payroll operation will be set out in further guidance and secondary legislation. The government may also change tax and National Insurance rates before 2029.
TaxOptions currently models the 2026/27 tax year under the rules that apply now. It does not use the announced 2029 National Insurance treatment when calculating current-year results.
Official sources
- GOV.UK: Changes to salary sacrifice for pensions from April 2029
- HMRC: Salary sacrifice reform for pension contributions
- GOV.UK: Budget 2025 overview of tax legislation and rates
Coverage and analysis
Pension salary sacrifice has received wider attention ahead of the announced April 2029 changes.
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The Guardian: Salary sacrifice: max out this pension tax break while you can
An accessible explanation of how pension salary sacrifice works today and how the National Insurance benefit is due to change.
Explore the rules that apply now
Compare pension salary sacrifice levels using published tax and National Insurance rules for 2026/27.
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