NI on Salary Sacrifice Calculator (2029) Trending
Compare current salary sacrifice NI savings vs proposed 2029 rules. See how much you'll lose.
By Konstantin Iakovlev · Founder, Calks.uk
Last updated: · Verified against HMRC and GOV.UK 2026/27 rates
Current Rules
£1,400.00
Tax: £1,000.00 + NI: £400.00
Net cost: £3,600.00
From April 2029
£1,000.00
Tax only: £1,000.00
Net cost: £4,000.00
You'll Lose
£400.00/year
in NI savings from April 2029
Proposed change (April 2029):
Employee NI will be charged on salary sacrifice pension contributions. Currently you save both tax AND NI. After 2029 you'll only save tax. Salary sacrifice will still be better than relief at source, but the advantage shrinks significantly.
Disclaimer
This calculator is provided for informational purposes only and should not be considered as financial or tax advice. All calculations are performed locally in your browser — no personal data is collected or sent to our servers. Rates and thresholds are sourced from HMRC and GOV.UK and are updated for the current tax year. Always verify results with HMRC or consult a qualified professional before making financial decisions.
How It Works
Pension contributions made via salary sacrifice currently reduce the salary on which employer National Insurance is calculated. At the 2026/27 employer NI rate of 15%, every £1,000 redirected to a pension saves the employer £150 in NI — many employers pass this saving to employees as an enhanced pension contribution.
The government has consulted on removing the employer NI advantage on salary sacrifice pension contributions, with 2029 cited as a potential implementation date. Under the proposed change, the pension contribution would not reduce the employer NI base, eliminating the NI efficiency of current salary sacrifice arrangements.
This calculator quantifies your current NI saving and estimates what you would lose under the proposed rules. This is a proposed change only — no legislation has been passed as of April 2026. Use these results for financial planning and to assess whether it is worth locking in current arrangements.
NI changes timeline 2024-2029. April 2024: Employee NI cut 12% → 10%. January 2024: Cut to 10% → 8%. April 2025: Employer NI raised 13.8% → 15%, secondary threshold lowered £9,100 → £5,000. April 2028: Pension access age rises 55 → 57. April 2029: Speculated future changes — possible employee NI cut + further employer NI rise. Employment Allowance £10,500 (raised April 2025).
Salary sacrifice NI savings 2026. Employee saves: 8% NI + 20-45% income tax = 28-53% on sacrificed amount. Employer saves: 15% NI on sacrificed salary. Sample £5,000 sacrifice for 40% taxpayer: employee saves £2,400 (40% IT + 8% NI); employer saves £750 NI. Total £3,150 saved on £5,000 contribution. Net pension cost: £1,850 for £5,000 pension boost. Most powerful tax-efficient route for UK middle/high earners.
What can be salary sacrificed? Pension contributions: most common, no limit beyond Annual Allowance £60k. Cycle to Work scheme: £1,000-£3,500 bike. Electric vehicle lease: huge saving for higher-rate (30-50% net cost reduction). Childcare vouchers: closed to new entrants since Oct 2018 (existing recipients continue). Holiday buying: 2-4 weeks extra leave. NOT eligible: medical insurance (BIK applies); gym membership (BIK).
Salary sacrifice pitfalls. National Living Wage: salary cannot drop below NLW after sacrifice. Mortgage capacity: lenders typically use POST-sacrifice salary for borrowing (less capacity). Maternity pay: based on sacrificed salary unless contract overrides. Death-in-service: lower payout. State Pension: NI credits based on lower earnings — long-term impact. Universal Credit: based on salary after sacrifice (may increase entitlement).
April 2028 pension access age change. Currently access defined-contribution pension at 55. Rising to 57 from 6 April 2028. Affects: pension Lifetime ISA withdrawal (currently 60). Implications: those born after 6 April 1973 must wait until 57 to access pension. Plan accordingly: gap savings, bridge income. ISA + Lifetime ISA + property income often bridge gap between early retirement and pension access age.
Example: £50,000 salary, £5,000 pension via salary sacrifice
- Current employer NI base: (£50,000 − £5,000 sacrifice − £5,000 threshold) = £40,000
- Current employer NI: £40,000 × 15% = £6,000/year
- Proposed 2029 NI base: (£50,000 − £5,000 threshold) = £45,000 × 15% = £6,750
- Annual NI saving lost: £750/year per employee
Frequently Asked Questions
- How does salary sacrifice save NI?
- When you make pension contributions through salary sacrifice, your contractual salary is reduced by the contribution amount before NI is calculated. This lowers the NI base for both you and your employer. At the 2026/27 employer NI rate of 15%, every £1,000 directed to a pension saves the employer £150 in NI. Many employers share this saving with employees.
- What changes are proposed for salary sacrifice NI in 2029?
- The government has consulted on restricting the employer NI advantage on pension contributions made via salary sacrifice. Under the proposed change, pension contributions would not reduce the employer NI base, removing the NI saving currently available. No legislation has been passed as of April 2026 and the 2029 date is subject to change.
- Should I increase salary sacrifice pension before 2029?
- If the proposed changes proceed, maximising salary sacrifice pension contributions while the NI advantage remains available could be beneficial — particularly if your employer passes the NI saving back to you as an enhanced contribution. Review your pension arrangement with a financial adviser before making significant changes.