UK Salary Sacrifice Calculator

Salary sacrifice is an arrangement where you give up part of your gross salary in exchange for a non-cash benefit from your employer. Because your salary is reduced before tax and National Insurance are calculated, you pay less in deductions. Common salary sacrifice benefits include pension contributions, cycle-to-work schemes, childcare vouchers, and electric vehicles.

Your savings depend on your tax bracket. Basic rate taxpayers (20%) now save around 28% (20% tax + 8% NI). Higher rate taxpayers (40%) save around 42% (40% tax + 2% NI). Scottish taxpayers have different rates. For a £5,000 sacrifice, a 40% taxpayer saves approximately £2,100 in tax and NI.

Common salary sacrifice benefits include: Pension contributions (most popular), Cycle-to-work scheme (bikes up to £1,000+), Electric vehicle leasing (with low BIK tax), Childcare vouchers (legacy scheme for existing members), Technology schemes (laptops, phones), and Gym memberships. Not all employers offer all benefits.

Salary sacrifice pension contributions are paid by your employer on your behalf, so they don't need to be grossed up for tax relief – you get full relief automatically. However, your reduced salary means lower employer NI contributions, which some employers pass on as increased pension contributions.

It can. Mortgage lenders look at your gross salary, and salary sacrifice reduces this on paper. Some lenders will add back pension sacrifice when assessing affordability, but not all. If you're planning a mortgage application, consider timing your salary sacrifice carefully or discussing with your broker.

Only if your reduced salary falls below the National Insurance Lower Earnings Limit (£6,500/year in 2025/26). Above this threshold, you continue to accrue State Pension entitlement. For most people, salary sacrifice won't affect State Pension, but check if making large sacrifices.

Cycle-to-work allows you to salary sacrifice the cost of a bike and equipment, typically over 12-18 months. At the end, you can usually purchase the bike for a small residual value (3-7% of original price). There's no legal limit, but most schemes cap at £1,000-£3,000. Electric bikes are included.

EV salary sacrifice lets you lease an electric car through your employer at a reduced cost due to tax and NI savings. You pay Benefit in Kind (BIK) tax, but for EVs this is currently just 2% of the car's list price – making it very tax-efficient. You also get insurance, maintenance, and charging included in most schemes.

The Salary Calculator is useful for a quick take-home pay estimate with pension deductions, but even its own pension notes say contributions are estimated because pensionable pay can vary by employer. Boring Math is a better alternative when you want a dedicated salary sacrifice view with true cost, employee and employer NI savings, and direct links to the pension, student loan, and £100k tax-trap follow-up decisions.

Use HMRC when you want the rules and thresholds. Use a salary sacrifice calculator when you want to model a real decision, such as how much take-home pay you lose, how much NI you save, and whether a pension sacrifice changes your student loan or £100k taper position. The practical move is to use Boring Math for the scenario, then check HMRC if you need the official policy wording.