Finance & Money

UK Salary Sacrifice / Pension Take-home Calculator

Rates & guidance reviewed 3 August 2026

Salary sacrifice (sometimes called salary exchange) is a common way UK employees pay into a workplace pension: you agree a lower contractual salary and your employer pays the difference into your pension. Because Income Tax and employee National Insurance are calculated on the reduced pay, the hit to your take-home is often smaller than the amount going into the pension.

This free calculator estimates take-home with a pension salary sacrifice, shows tax and NI saved versus no pension, and compares the same contribution modelled without sacrifice (relief-at-source style — tax relief, but NI usually still on full pay). Optional employer contribution percentage helps you see total money into the pot.

Results are simplified annual estimates for guidance only. Scheme rules, Annual Allowance, tapered allowance, auto-enrolment quality requirements and student loan interactions can change the real outcome — check your payslip, scheme booklet and HMRC guidance.

Illustrative UK bands · PA £12,570 · employee NI 8%/2% · employer NI 15% above £5k

Salary sacrifice reduces contractual pay before Income Tax and employee NI. Compare with a simple relief-at-source style pension of the same amount (tax relief, but NI usually still on full pay). Verify scheme rules and current HMRC tables.

Examples:

Gross annual salary (£)

Contractual pay before sacrifice

Tax region

Sacrifice input

Employee sacrifice (% of gross)

Paid into pension via reduced salary

Employer pension (% of gross)

Optional — auto-enrolment style contribution

Take-home with salary sacrifice

Annual take-home£34,299.60

Monthly (÷12)£2,858.30

Weekly (÷52)£659.61

Contractual gross£45,000.00

After sacrifice (taxable pay)£42,750.00

Employee sacrifice£2,250.00

Employer pension (est.)£1,350.00

Total into pension£3,600.00

Income Tax£6,036.00

Employee NI£2,414.40

Benefit of sacrificing (vs no pension)

Income Tax saved£450.00

Employee NI saved£180.00

Tax + NI saved£630.00

Net cost of your sacrifice£1,620.00

You put £2,250.00 into pension but take-home only falls by £1,620.00 — tax and NI cover about £630.00 of the contribution.

vs same pension without sacrifice

Same employee amount modelled as relief-at-source style (tax relief on contributions; NI still on full contractual pay).

Take-home without sacrifice£34,119.60

Take-home with sacrifice£34,299.60

Extra take-home from sacrifice£180.00

Extra employee NI saved£180.00

Employer NI saved (illustrative)£337.50

Employer NI saving is a cost to the business, not your net pay. Some schemes share part of this saving into your pension.

Side-by-side snapshot

Item	No pension	Relief-style	Sacrifice
Gross for tax/NI	£45,000	£45,000	£42,750
Income Tax	£6,486	£6,036	£6,036
Employee NI	£2,594	£2,594	£2,414
Pension (you)	£0	£2,250	£2,250
Take-home	£35,920	£34,120	£34,300

Estimate only. Annual Allowance, tapered allowance, scheme charges, protected tax-free cash and benefit-in-kind rules are not modelled. Student loans use separate thresholds — try the student loan calculator. For full tax/NI without sacrifice detail, use the take-home pay calculator and National Insurance calculator.

How to use this tool

Enter your contractual gross annual salary before sacrifice.
Choose England/Wales/NI or Scotland for Income Tax bands.
Enter the employee sacrifice as a % of gross or a fixed £ amount.
Optionally add an employer pension contribution % of gross.
Compare take-home with sacrifice, net cost of the contribution, and the same pension without sacrifice.

How pension salary sacrifice works

Under a valid salary sacrifice arrangement you and your employer change your contract so you receive less cash pay and more pension contribution. PAYE then applies Income Tax and employee Class 1 NI to the lower cash earnings. The sacrificed amount is typically paid into your pension by the employer, so it never appears as net pay you then contribute from.

That is different from many relief-at-source schemes, where you may still pay NI on your full contractual salary while receiving tax relief on pension contributions. The main extra benefit of sacrifice for many employees is therefore lower employee National Insurance (and sometimes other pay-related deductions), not only Income Tax relief.

Employers also often pay less secondary Class 1 NI on the reduced salary. Some share part of that saving into your pension; others keep it. This tool shows an illustrative employer NI saving separately — it is not added to your take-home automatically.

What this calculator does not cover

Student loan deductions can change when income used for the loan threshold falls — model loans separately and combine carefully. Benefits in kind, salary sacrifice for other benefits (cars, cycle to work), minimum wage constraints, and Annual Allowance charges are out of scope.

Scottish Income Tax rates differ; National Insurance remains UK-wide. Personal Allowance taper above £100,000 is applied to the pay figure used for tax in each scenario, which is especially relevant when sacrifice moves you around that zone.

Frequently asked questions

What is pension salary sacrifice?

It is an agreement to reduce your contractual salary so your employer pays the sacrificed amount into your pension. Income Tax and employee NI are then usually calculated on the lower pay, which can make pension saving more tax-efficient than contributing from net pay alone.

How is this different from relief at source?

Relief-at-source style contributions typically still leave employee NI charged on full contractual pay, while giving Income Tax relief on the pension. Salary sacrifice usually reduces both tax and employee NI bases. This tool compares both models for the same contribution amount.

Which tax and NI rates are used?

Illustrative UK structure: Personal Allowance £12,570 with £100k taper; rUK 20%/40%/45% (simplified Scottish bands available); employee NI 8% then 2% (PT £12,570 / UEL £50,270); employer NI 15% above a £5,000 secondary threshold. Always verify the current tax year on GOV.UK.

Does sacrifice affect student loans?

It can, because repayments are based on income. This page does not model student loans — use the UK Student Loan Calculator with the relevant income figure for your plan, then combine with care.

Is employer NI saving paid to me?

Not automatically. Employer Class 1 NI is a cost to the business. Some employers pass part of any NI saving into your pension; others do not. The figure shown is illustrative only.

Is my data stored?

No. All calculations run in your browser and are not sent to our servers.