Salary Sacrifice Car Calculator

Your employer leases the car and the lease payment comes out of your gross salary before income tax and National Insurance are deducted. On a £450 a month lease, a 40% taxpayer effectively pays around £270 a month after tax savings, because the £450 is no longer in their taxable income. You then pay a small Benefit-in-Kind tax charge on the company car, which for an electric vehicle is 2% rising to 5% by 2028/29. For an EV at £35,000 list price, the BiK tax is roughly £30 a month for a 40% taxpayer. So a £450 lease can cost £300 in real money, monthly.

The catch is that this only works well for low-emission vehicles. Petrol and diesel cars carry BiK rates of 25 to 37%, which destroys the saving. The maths effectively means salary sacrifice in 2026 is an EV scheme; trying to do it with a petrol family car gives you most of the lease cost back as BiK tax and the saving disappears.

The higher your tax band, the better salary sacrifice gets. A 20% basic rate taxpayer saves 20% income tax + 8% National Insurance = 28% on each pound sacrificed. A 40% taxpayer saves 40% + 2% NI = 42%. A 45% additional rate taxpayer saves 47%. So on the same £450 lease, a basic rate payer saves £126 a month, a higher rate payer saves £189, and an additional rate payer saves £211.

The tradeoff is that the sacrifice reduces the salary your pension, mortgage application, and life insurance use as inputs. For most people on a 3 to 4 year lease this is fine, but if you are about to apply for a mortgage, lenders will use the post-sacrifice salary, which can drop the loan amount you qualify for. Plan the timing around big life events accordingly.

It takes your gross salary, the car's P11D value, the monthly lease cost, and your tax band, then works out: gross sacrifice (annual lease cost), income tax relief, National Insurance relief, BiK tax cost on the car, and your net monthly cost after all the moving parts. The bottom line is the 'true monthly cost' you actually feel in your bank account, which for an EV salary sacrifice typically lands at 50 to 65% of the headline lease price.

Compare that to a personal lease where you would pay the full £450 from post-tax salary, which for a 40% taxpayer requires around £775 of pre-tax earnings. That puts the salary sacrifice route at a saving of £475 a month, or £5,700 a year, against the equivalent personal lease. For an EV in particular, this is the most cost-efficient way to drive a new car in the UK in 2026.