Calculator inputs
Example data table
| Scenario | Salary | Sacrifice | Take Home Change | Employer Saving | Benefit Funding |
|---|---|---|---|---|---|
| Pension shift | £42,000.00 | £2,100.00 | £1,512.00 | £289.80 | £2,244.90 |
| Cycle scheme | £36,000.00 | £1,200.00 | £864.00 | £165.60 | £1,200.00 |
| EV lease | £72,000.00 | 10.00% | £4,176.00 | £993.60 | £7,448.40 |
These scenarios are illustrative only. Real payroll outcomes can differ when bands, exemptions, benefit rules, or statutory caps apply.
Formula used
The calculator applies a simplified payroll comparison using user-entered rates and thresholds.
1) Salary sacrifice amount
Fixed mode: Sacrifice = entered amount
Percent mode: Sacrifice = annual salary × sacrifice percentage
2) Adjusted gross salary
Adjusted gross = annual salary − sacrifice amount
3) Income tax
Taxable pay = max(0, gross pay − tax allowance)
Income tax = taxable pay × income tax rate
4) Employee social contribution
Employee social base = max(0, gross pay − employee threshold)
Employee social = employee social base × employee rate
5) Employer social contribution
Employer social base = max(0, gross pay − employer threshold)
Employer social = employer social base × employer rate
6) Take-home comparison
Take home = gross pay − income tax − employee social
7) Benefit funding
Benefit funding = sacrifice amount + shared employer payroll savings
8) Net employer saving
Net employer saving = employer cost before − employer cost after
How to use this calculator
Enter the employee’s annual salary first. Choose a currency and the pay frequency you want to review.
Select whether the sacrifice is a fixed amount or a percentage of salary. Then enter the corresponding value.
Fill in the tax allowance, employee social rate, employee threshold, employer social rate, and employer threshold that match your payroll assumptions.
If the employer shares part of its payroll saving with the employee benefit, enter that percentage. Use zero when no saving is shared back.
Click Calculate now. The page will show the result summary above the form, a comparison chart, and annual plus per-period values.
Use the export buttons to save the result summary as a CSV file or a PDF file for reporting or review.
FAQs
1) What is salary sacrifice?
Salary sacrifice is an agreement where an employee gives up part of gross salary in exchange for a non-cash benefit, such as pension funding, a cycle scheme, or an EV lease.
2) Why does take-home pay drop by less than the sacrifice?
Because the employee usually saves some income tax and social contributions on the amount exchanged. The calculator estimates those savings from the rates and thresholds you enter.
3) Can employers save money too?
Yes. Employers may reduce payroll-linked social costs when gross salary falls. This tool shows that payroll saving separately, then lets you share some or all of it back.
4) Is this suitable for every country?
It is flexible, but it is still a simplified model. Real tax bands, local benefit rules, statutory minimums, and exemptions differ by country and benefit type.
5) What does benefit funding mean here?
Benefit funding is the sacrificed salary plus any employer payroll saving that is shared back. It represents the estimated value directed to the chosen benefit arrangement.
6) Why are there thresholds for social contributions?
Many payroll systems only charge employee or employer social costs above certain earnings thresholds. Entering those limits makes the estimate more realistic for planning.
7) Can this replace payroll or legal advice?
No. Use it for planning, scenario comparison, and HR discussions. Final implementation should always be checked against your payroll provider, local rules, and employment documentation.
8) What benefits are commonly modeled with salary sacrifice?
Common examples include pensions, cycle-to-work plans, electric vehicle leasing, childcare programs where permitted, and selected workplace technology or wellness arrangements.