How much National Insurance do I save with salary sacrifice?

You save employee NI at 8% on sacrificed earnings between the £12,570 Primary Threshold and £50,270 Upper Earnings Limit, and 2% on any sacrificed amount above £50,270, on top of the Income Tax saved at your marginal rate.

Can salary sacrifice affect my other benefits?

Yes — because it lowers your official salary figure, it can affect income-based calculations such as mortgage affordability assessments, Statutory Maternity Pay, and student loan repayments, which are all based on gross pay.

Is salary sacrifice worth it if I earn near £100,000?

Often especially valuable — sacrificing enough salary to stay under £100,000 avoids the Personal Allowance taper, which creates an effective marginal tax rate of 60% between £100,000 and £125,140.

Does my employer save money too with salary sacrifice?

Yes — the employer also stops paying 15% Employer NI on the sacrificed amount, which is why many employers pass some of that saving back into the employee's pension.

Salary Sacrifice Pension Savings Calculator UK

Why salary sacrifice usually beats a normal pension contribution

A normal pension contribution comes out of your take-home pay after tax and NI have already been deducted, and the pension scheme claims back basic-rate tax relief for you. Salary sacrifice works differently: your employer reduces your official salary before tax and NI are calculated at all, and pays the sacrificed amount straight into your pension instead. That means you never pay Income Tax or employee National Insurance on the sacrificed slice — a saving a normal contribution's tax relief alone doesn't fully match.

Worked example (basic-rate taxpayer)

Sacrifice	£2,250 (5% of £45,000 salary)
Income Tax saved	20% × £2,250 = £450
Employee NI saved	8% × £2,250 = £180
Total relief	£630
Actual cost to take-home pay	£2,250 − £630 = £1,620
Pension gets	£2,250 (full amount, no reclaim needed)

How this calculator works — Formulas & Method

Source: HMRC Income Tax and NI thresholds 2026/27, gov.uk/national-insurance-rates-letters · Deterministic calculation — no AI, no arbitrary estimation

Constants used

Constant	Value	Source
Personal Allowance	£12,570	gov.uk Income Tax rates 2026/27
Basic rate band	20% up to £50,270	gov.uk Income Tax rates 2026/27
Higher rate band	40% up to £125,140	gov.uk Income Tax rates 2026/27
Employee NI Primary Threshold	£12,570/yr	gov.uk NI rates and letters 2026/27
Employee NI Upper Earnings Limit	£50,270/yr, 8% between PT/UEL, 2% above	gov.uk NI rates and letters 2026/27

Formulas

        — Sacrifice amount —

        sacrifice = gross_salary × (sacrifice_pct / 100)

        new_salary = gross_salary − sacrifice

        — Marginal rate at pre-sacrifice salary —

        tax_rate = 20% if new_salary ≤ £50,270, else 40%, else 45% above £125,140

        ni_rate = 8% if new_salary above £12,570 PT and below £50,270 UEL, else 2%

        — Savings —

        tax_saved = sacrifice × tax_rate

        ni_saved = sacrifice × ni_rate

        net_cost = sacrifice − tax_saved − ni_saved

Deterministic calculation based on official 2026/27 bands. Simplified marginal-rate model — doesn't account for the Personal Allowance taper above £100,000 or Scottish bands; always confirm your own position with a qualified adviser.

Want the full take-home pay picture, not just the sacrifice saving?

This calculator isolates the tax/NI saved on one sacrifice decision. But salary sacrifice only makes sense in context of your whole payslip — your Income Tax band, employee NI, any student loan repayment, and what your take-home actually lands at after the sacrifice is applied. That's a full-payslip calculation, not a single-variable one.

MyNetSalary.co.uk runs that full calculation for free:

Before you commit to a %: enter your salary into the take-home pay calculator first, see your current Income Tax + NI split, then model different sacrifice percentages against it.
Near the £100,000 taper zone: if your salary sits between £100,000–£125,140, the site shows the 60% effective marginal rate directly — sacrifice-to-avoid-taper decisions are much clearer with the real numbers in front of you.
Combining pension with student loan: sacrificing salary lowers the income student loan repayments are calculated on too — model both together instead of guessing.
Comparing pension contribution routes: the site's pension contribution calculator models auto-enrolment minimums and marginal-rate relief side by side with salary sacrifice.
Scotland vs rest of UK: Scottish taxpayers have different bands (19–48%) — the calculator applies the correct region automatically instead of a flat England assumption.

Free, no signup, 2026/27 rates, covers England/Wales/NI and Scotland.

Calculate my full take-home pay →

Frequently asked questions

What is salary sacrifice for pension?

An arrangement where you agree to a lower gross salary in exchange for your employer paying that amount into your pension directly — avoiding Income Tax and employee NI on the sacrificed portion.

How much National Insurance do I save?

8% on sacrificed earnings between £12,570 and £50,270, 2% above that, on top of Income Tax relief at your marginal rate.

Does salary sacrifice reduce my take-home pay?

Yes, but by less than the sacrificed amount — the tax and NI you'd otherwise have paid on it are never deducted.

Can it affect other benefits?

Yes — mortgage affordability checks, Statutory Maternity Pay and student loan repayments are all based on gross salary, which is lower after sacrifice.

Is it worth it near £100,000?

Often yes — sacrificing enough to stay under £100,000 avoids the Personal Allowance taper's 60% effective rate between £100,000–£125,140.

Does my employer save too?

Yes, 15% Employer NI on the sacrificed amount — some employers pass part of this back into your pension.