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Pension Salary Sacrifice Calculator UK — 2026/27

Compare cash pay before and after a pension salary sacrifice. See the Income Tax and employee National Insurance saved, any employer NI added to the pension, adjusted net income, and the annual-allowance position without treating the announced 2029 rules as current law.

Published by GrowThenDraw Editorial Team · Editorial policy · Methodology & sources

Cash pay and sacrifice

Pension, rental or other non-savings income. Savings and dividends use different tax rules and are excluded.

Employer and pension input

Include other personal/employer contributions and defined-benefit input, but not the sacrifice entered above.

Enter only the percentage your employer confirms; it is not automatic.

£60,000 is the standard starting point, not a promise that taper or MPAA does not apply.

Employer pay floor

Optional. Ask payroll for the applicable National Minimum Wage and scheme floor based on hours and pay period.

Added to pension by this decision
£6,450
Costs about £3,480 of estimated annual disposable income · £54 per £100 added.
Income Tax saved
£2,400
Employee NI saved
£120
Employer NI added
£450
Allowance remaining
£50,550
Threshold and allowance audit
Adjusted net income before
£60,000
Adjusted net income after
£54,000
Personal Allowance regained
£0
Pension input after decision
£9,450

Potential annual-allowance excess: £0. This is an input audit, not an annual-allowance charge calculation.

£30k£60kBefore: disposable income £45,357, Income Tax £11,432, employee NI £3,211Before: disposable income £45,357, Income Tax £11,432, employee NI £3,211Before: disposable income £45,357, Income Tax £11,432, employee NI £3,211After: disposable income £41,877, Income Tax £9,032, employee NI £3,091After: disposable income £41,877, Income Tax £9,032, employee NI £3,091After: disposable income £41,877, Income Tax £9,032, employee NI £3,091BeforeAfter
Estimated disposable incomeIncome TaxEmployee NI
Take-home cost: £3,480Income Tax saved: £2,400Employee NI saved: £120
Take-home costIncome Tax savedEmployee NI saved
£4.7k£9.5kBefore this decision: £3,000 pension inputAfter this decision: £9,450 pension inputAfter this decision: £9,450 pension inputAfter this decision: £9,450 pension inputBeforeAfter
Existing and other pension inputSalary sacrificedEmployer NI added
Annual itemBeforeAfterDifference
Cash salary£60,000£54,000−£6,000
Personal Allowance£12,570£12,570+£0
Income Tax£11,432£9,032−£2,400
Employee NI£3,211£3,091−£120
Estimated disposable income£45,357£41,877−£3,480
Total pension input£3,000£9,450+£6,450
Compare the contribution routes

Pension tax relief methods

Translate one gross target across relief at source, net pay and salary sacrifice, including claims and NI.
Current-rule guide

How pension salary sacrifice works

Understand tax, employee and employer NI, pay floors, Personal Allowance and the announced 2029 change.
Check the allowance

Test taper, MPAA and carry forward

Carry this total pension input into the full 2026/27 annual-allowance audit.
Check Child Benefit

Audit adjusted net income and HICBC

Compare the higher-earning partner and the £60,000–£80,000 charge after a pension decision.

What a successful pension salary sacrifice changes

You contractually give up future cash salary and your employer pays an employer contribution to a registered pension instead. Under the current 2026/27 treatment, the sacrificed cash is removed before Income Tax and Class 1 National Insurance. Employer pension contributions are not taxable earnings for the employee, although they count towards the pension annual allowance.

The calculator compares the same total taxable income before and after the sacrifice, then keeps Income Tax, employee NI, employer NI and pension funding as separate lines. An employer does not have to pass its NI saving into your pension, so that percentage is always editable.

Why £10,000 of pension does not always cost the same take-home pay

Income Tax saving depends on the band the sacrificed income would have occupied. Employee NI is 8% between the 2026/27 primary threshold and upper earnings limit, but only 2% above the upper limit. A simple ‘tax rate plus 8%’ shortcut is therefore wrong when a sacrifice crosses £50,270.

Adjusted net income can also restore some Personal Allowance between £100,000 and £125,140. The engine applies the standard £1-for-£2 taper, which can make the Income Tax difference larger than a headline marginal band. It does not calculate Child Benefit, Tax-Free Childcare or student-loan effects.

Check pay floors and the annual allowance separately

A salary sacrifice cannot reduce cash earnings below the National Minimum Wage. Exact compliance depends on age, hours, pay reference period and other pay elements, so the tool asks for the minimum annual cash salary confirmed by the employer rather than inventing a universal floor. Earnings-related statutory pay, life cover, mortgage evidence and workplace benefits can also change.

The available-allowance input is an audit control, not an eligibility decision. The standard annual allowance is £60,000, but taper, the money purchase annual allowance, carry forward, defined-benefit accrual and other schemes can change the amount. Use the linked carry-forward calculator or a scheme statement before relying on it.

The announced April 2029 NI change is not a 2026/27 rule

The government has announced that from 6 April 2029 only the first £2,000 of employee pension contributions made through salary sacrifice each year will remain exempt from employee and employer NI. Income Tax exemption is intended to continue, and ordinary employer contributions are intended to remain free of NI.

This calculator is pinned to current 2026/27 law. It does not project a 2029 result using today's NI thresholds because implementation detail and future payroll thresholds can change. That future policy is disclosed beside the result instead of being silently mixed into the current calculation.

Frequently asked questions

How much National Insurance do I save with pension salary sacrifice?

For a regular-pay category-A employee in 2026/27, annualised employee NI is 8% between £12,570 and £50,270 and 2% above £50,270. The saving is the difference between NI on cash salary before and after the sacrifice, so it can cross both rates.

Does my employer add its National Insurance saving to my pension?

Not automatically. Employer NI is normally 15% above the £5,000 annual secondary threshold in this model, but the employer decides whether any saving is added. Enter the percentage your scheme confirms.

Can salary sacrifice restore my Personal Allowance?

It can reduce employment income used in adjusted net income. The standard Personal Allowance falls by £1 for every £2 above £100,000, so a successful sacrifice can restore allowance. Other taxable income, Gift Aid and pension contributions can also affect the actual calculation.

Can salary sacrifice take my pay below minimum wage?

No. GOV.UK states that a salary sacrifice arrangement must not reduce cash earnings below National Minimum Wage rates. Ask payroll for the applicable floor because it depends on age, hours and the pay reference period.

Does salary sacrifice count towards the pension annual allowance?

Yes. A successful sacrifice becomes an employer pension contribution, and employer contributions count in the pension input tested against the annual allowance. Add other schemes and defined-benefit input before judging an excess.

Does the calculator include the £2,000 salary-sacrifice cap?

It discloses but does not apply it. The announced NI-exempt limit starts on 6 April 2029, while this calculator models 2026/27 current law. Future guidance and payroll thresholds should be checked closer to implementation.

Rules and methodology verified 2026-08-10:

Scope: one 2026/27 tax year, successful contractual pension salary sacrifice, non-savings income tax for England/Wales/Northern Ireland or Scotland, annualised regular-pay category-A employee and ordinary employer Class 1 NI, optional employer NI sharing, entered pension input and available allowance.

Excludes exact per-pay-period payroll rounding, directors, other NI letters, student or postgraduate loans, Child Benefit, Tax-Free Childcare, benefits, Gift Aid, savings/dividend tax, multiple jobs, statutory pay, auto-enrolment certification, scheme charges, investment growth, defined-benefit valuation, allowance-charge tax, future 2029 payroll thresholds and personalised suitability. Educational estimate only, not financial, pension, tax, payroll or employment-law advice.