Home / Income / Salary Sacrifice Calculator

Salary Sacrifice Calculator

Estimate how sacrificing part of your salary could affect take-home pay. It helps compare current pay with a salary sacrifice arrangement for pension contributions, workplace benefits, or other eligible schemes.

Change in take-home pay
-£134 per month

You give up £200 a month. Your take-home pay falls by about £134, and about £200 goes into your pension.

You give up
£200 / month
Salary moved before tax and NI.
Your pay falls by
£134 / month
Your take-home usually falls by less than you give up.
Goes into pension
£200 / month
Includes any employer NI saving added to your pension.
Show tax, NI and student loan detail
Before
£2,527 / month
Estimated take-home pay now.
After
£2,393 / month
Estimated take-home pay after salary sacrifice.
Tax saved
£480 / year
Estimated income tax reduction.
NI saved
£192 / year
Estimated employee National Insurance reduction.
Student loan change
£0 / year
Estimated reduction in repayments.
Cost per £100
£67
Approximate take-home cost for each £100 sacrificed.
Net benefit
£792 / year
Sacrificed salary minus the fall in take-home pay.
Extra pension
£2,400 / year
Total extra pension funding from this sacrifice.

Before vs after salary sacrifice

Annual comparison
Before After
£30,320
£28,712
Take-home pay
£5,486
£5,006
Income tax
£2,194
£2,002
National Insurance
£3,200
£5,408
Pension contribution
£0
£0
Student loan

Salary sacrifice breakdown

Before, after, difference
Item Before After Difference
Gross salary £40,000 £37,600 -£2,400
Taxable income £40,000 £37,600 -£2,400
Income tax £5,486 £5,006 -£480
National Insurance £2,194 £2,002 -£192
Student loan £0 £0 £0
Pension contribution £3,200 £5,408 £2,208
Take-home pay £30,320 £28,712 -£1,608

What this means

Reducing salary by £2,400 lowers the pay used for Income Tax, employee National Insurance, and student loan calculations. In this estimate that saves about £672 a year across payroll deductions.

The drop in take-home pay is about £1,608 a year, which works out to roughly -£134 a month compared with your current setup.

Because the sacrificed amount is redirected into pension funding, around £2,400 a year moves into the pension through salary sacrifice.

Before using salary sacrifice

Salary sacrifice changes contractual salary. That can affect borrowing, workplace benefits, statutory payments, and employer pension rules.

Estimate only: this calculator assumes steady pay across the year, standard employee National Insurance Category A, a 1257L tax code, and percentage-based pension contributions. It does not model bonuses, taxable benefits, existing salary sacrifice, or employer-specific payroll rules.

What is salary sacrifice?

Salary sacrifice is an arrangement where you agree to give up part of salary in exchange for a non-cash benefit from your employer. A common example is pension salary sacrifice, where some salary is paid into the workplace pension instead of being paid to you as cash salary.

Because salary is reduced before some payroll deductions are worked out, salary sacrifice can reduce income tax and employee National Insurance.

How salary sacrifice affects take-home pay

Salary sacrifice usually reduces take-home pay, but often not by the full amount sacrificed. That is because lower salary can mean lower income tax, lower employee National Insurance, and lower student loan repayments.

In practice, sacrificing £100 may reduce take-home pay by materially less than £100, depending on tax band, NI position, and loan deductions.

Salary sacrifice and pensions

Pension salary sacrifice can be tax-efficient because the sacrificed amount goes into the pension before income tax and National Insurance are deducted. That can increase pension funding while reducing the impact on take-home pay.

Some employers also add part or all of their employer National Insurance saving to the pension, though not every scheme does this.

Salary sacrifice and student loans

Student loan deductions are based on pay above the relevant threshold. If salary after sacrifice is lower, student loan deductions may be lower too.

That does not remove the loan. It changes how much is repaid through payroll during the year.

Things to consider before changing pay

A lower contractual salary can affect mortgage applications, life cover, statutory maternity pay, sick pay, redundancy calculations, and some workplace benefits.

Employers also need to keep pay above the National Minimum Wage or National Living Wage, which can limit how much salary can be sacrificed.

Frequently Asked Questions

Is salary sacrifice worth it?

Salary sacrifice can be worth it if the tax and National Insurance savings make the benefit more valuable than taking the same amount as salary. Pension salary sacrifice is often useful, but the result depends on income, tax band, student loan plan, and employer scheme rules.

Does salary sacrifice reduce income tax?

Yes. Salary sacrifice can reduce income tax because taxable salary is lower. The amount saved depends on tax band and how much salary is sacrificed.

Does salary sacrifice reduce National Insurance?

Yes. Salary sacrifice can reduce employee National Insurance because pay for National Insurance purposes is usually lower.

Does salary sacrifice affect pension contributions?

Yes. If salary sacrifice is used for pension contributions, the sacrificed salary is paid into the pension instead of being taken as salary. Depending on employer rules, some or all of the employer National Insurance saving may also be added.

Can salary sacrifice reduce student loan repayments?

Yes. Student loan deductions are based on pay above the relevant threshold, so lower salary after sacrifice can reduce payroll deductions.

Can salary sacrifice take me below minimum wage?

Employers generally cannot use salary sacrifice if it would reduce pay below the National Minimum Wage or National Living Wage.

Does salary sacrifice affect mortgage applications?

It can. Some lenders focus on lower contractual salary after sacrifice, while others may consider pension contributions or a broader affordability picture. The treatment can vary by lender.

More UK Financial Calculators

Salary sacrifice sits between payroll, pensions, and student loan deductions, so it is worth checking the related calculators too. Use the Salary Calculator for a broader take-home view, the Pension Tax Relief Calculator for relief-at-source contributions, and the Student Loan Calculator to see how repayment plans affect the trade-off.

Salary Calculator → Pension Tax Relief Calculator → Student Loan Calculator → Salary to Hourly Calculator →