Pension salary sacrifice is the most tax-efficient retirement saving strategy available to UK employees. Unlike a standard pension contribution, sacrifice goes beyond income tax relief — it also saves you National Insurance. Done correctly, a basic-rate taxpayer saves 28%, a higher-rate taxpayer saves 42%, and if you're in the £100k trap, you're looking at a staggering 60%+ effective saving.

Salary Sacrifice Calculator

See your real net cost after tax & NI savings. Full details via our Salary Sacrifice Calculator.

Gross Salary: £60,000

£20k£200k

Sacrifice: 5% (£3,000)

1%30%

£3,000

Pension Funded

£1,260

Tax + NI Saved

£1,740

Real Net Cost

£145

Monthly Take-Home Drop

Effective tax saving rate on this sacrifice: 42%

Tax Saving vs Real Net Cost at Different Sacrifice Levels

At salary £60,000 — how much of each contribution comes from tax savings vs actual take-home reduction.

Salary Sacrifice vs Personal Contribution: What's the Difference?

With a personal pension contribution, you pay your pension from post-tax salary and HMRC adds 20% basic rate relief into the pot. Higher-rate taxpayers must claim the extra 20% back via Self Assessment.

With salary sacrifice, you contractually agree to a lower salary. Your employer directs the difference straight into your pension before your wages are even calculated. The result: your taxable income is reduced, so both income tax and National Insurance are lower.

Effective Saving Rate by Salary (5% Sacrifice)

Higher earners benefit far more from salary sacrifice. The spike at £110k reflects the Personal Allowance restoration.

Factor	Personal Contribution	Salary Sacrifice
Income Tax Relief	✅ Yes (20%, claim 40% via SA)	✅ Yes (automatic)
NI Saving (Employee)	❌ No	✅ Yes — saves 8% on contributions
NI Saving (Employer)	❌ No	✅ Yes — saves 13.8%
Employer passes on NI saving?	N/A	Often yes — check your scheme
Shows on payslip as	Gross salary unchanged	Reduced gross salary
Higher-rate relief process	File Self Assessment	Automatic via payroll
Affects mortgage application?	No	⚠️ Lower gross may affect affordability checks

Real Example: £50,000 Salary, 5% Sacrifice

Gross Salary (before sacrifice)£50,000£50,000

Pension Sacrifice (5%)£0−£2,500

Revised Gross for Tax/NI£50,000£47,500

Income Tax (approx)−£7,486−£7,000

NI approx (8% band)−£2,994−£2,794

Net Take-Home£39,520£37,706

Pension Pot Funded£2,500 (net)£2,500 (pre-tax)

Actual net cost of pension£2,500£1,680 — saving £820!

The £100k Trap: Why Sacrifice is Especially Powerful

For earners between £100,000 and £125,140, every £1 of salary sacrifice is worth 60p in tax saving — the combination of 40% income tax and the restored Personal Allowance. See our dedicated guide: The £100k Tax Trap Explained.

Annual Allowance: How Much Can You Sacrifice?

For 2026/27, the annual pension allowance is £60,000 (or 100% of your earnings, whichever is lower). This covers all contributions — yours, your employer's, and tax relief. Most employees comfortably stay well below this limit even with generous sacrifice arrangements.

If you've drawn from a pension flexibly (e.g., pension drawdown), the Money Purchase Annual Allowance (MPAA) of £10,000 may apply instead.

How to Set Up Salary Sacrifice

Ask your HR or payroll department if your employer offers a salary sacrifice pension scheme
Agree the percentage or fixed amount to sacrifice — you can often change it annually
Sign an amendment to your employment contract (this is a contractual change)
It takes effect from the next payroll run

Model Your Sacrifice Now

Use our Salary Sacrifice Calculator to see exactly how much you'd save. Or enter a pension % in the main UK Salary Calculator and toggle between pension types to compare.

How Pension Salary Sacrifice Works — Save Tax & Build Wealth