Salary Sacrifice vs a Pay Rise: Running the Numbers on a 2026 EV Deal

Every workplace EV scheme presentation has the same structure: a shiny car, a monthly figure, and a line about tax savings that everyone nods at without checking. The nod is the problem. Salary sacrifice is genuinely efficient, but the efficiency is unevenly distributed, and in a few specific circumstances it's worse than simply taking the cash.

Here's the working, without the brochure gloss.

How the mechanism actually works

You agree to give up a slice of gross salary. In exchange, your employer leases a car and provides it to you as a benefit in kind. Because the sacrifice comes off before tax and National Insurance, you never pay either on that money.

For 2026/27, an electric company car is taxed at 3% of its P11D value. On a £36,000 EV that's a taxable benefit of £1,080 — and crucially, company car benefit attracts income tax but not employee National Insurance. From April 2027 the rate steps up to 4%, so anything you sign now should be modelled on the rise.

Your employer also saves 15% employer NI on the sacrificed salary. Some pass that back into the scheme, some don't. Ask, because it's worth roughly £750 a year on a £5,000 sacrifice.

Three salary bands, one £420-a-month car

Take a scheme costing £5,040 a year gross, with insurance, servicing and breakdown included.

£38,000 salary (basic rate). You save 20% income tax plus 8% employee NI — 28% — so £1,411. The BIK costs 20% of £1,080, or £216. Net cost: £3,845 a year, about £320 a month. Effective discount: 24%.

£62,000 salary (higher rate). The sacrifice comes off the top, where you're paying 40% tax and 2% NI — 42%. Saving: £2,117. BIK at 40%: £432. Net cost: £3,355, about £280 a month. Discount: 33%.

£105,000 salary (tapered allowance). Between £100,000 and £125,140 the personal allowance unwinds, giving an effective 60% marginal rate, plus 2% NI. Saving: £3,125. BIK at 40%: £432. Net cost: £2,347, about £196 a month. Discount: 53%.

That last row is where salary sacrifice becomes genuinely powerful. If the sacrifice (plus a pension top-up) drops your adjusted net income below £100,000, you may also regain tax-free childcare hours — worth thousands, and routinely missed.

Why the comparison with a pay rise is trickier than it looks

A £5,040 pay rise at basic rate nets you £3,629 after tax and NI. The car costs you £3,845 net through the scheme. So the pay rise looks cheaper by £216 — until you remember the pay rise buys no car.

To lease the same vehicle personally you'd need around £5,400 of net income, because the lease is paid from taxed earnings. That's the real comparison, and it's why the scheme usually wins: you're buying £5,040 of motoring with £3,845 of pre-tax-equivalent cash.

But the scheme only wins if you were going to spend that money on a car anyway. If you'd have taken the pay rise, kept the ten-year-old estate and banked the difference, the pay rise wins comfortably. Salary sacrifice is a discount on consumption, not a wealth-building tool.

Four places the paperwork flatters the deal

Pension contributions. If you pay a percentage of salary rather than a fixed amount, sacrificing £5,040 reduces your pensionable pay. At 5% employer contribution that's £252 a year of free money quietly disappearing. Check whether your scheme carves out pensionable pay — some do, many don't.

Quoted monthly figures. The headline number in the brochure is usually the gross sacrifice. Your actual cost includes BIK, and excludes anything the scheme doesn't cover. Ask specifically about tyres, excess mileage (typically 8–12p per mile), insurance excess, and what happens if you leave or are made redundant mid-term.

Mortgage and credit assessments. Lenders work from contractual salary. A £5,000 sacrifice can trim your borrowing capacity at exactly the wrong moment. It also affects statutory maternity pay and some sick pay arrangements.

Charging, which nobody includes. The scheme gives you a car, not electrons. Home charging for 10,000 miles at 3.5 miles per kWh is around £714 a year at 25p per kWh — or nearer £2,000 if you're reliant on 70p rapid chargers. Off-peak tariffs at 7–9p transform that number, which is why a smart meter and an overnight window matter as much as the car.

When to sign, and when to walk

Sign if you're a higher or additional-rate taxpayer, you'd be buying a new car regardless, the scheme bundles insurance and servicing, and your pension is calculated on a fixed amount rather than a percentage.

Walk if you're a basic-rate taxpayer on a tight budget with a reliable car already on the drive, if the term runs longer than you plan to stay, if you're within a year of applying for a mortgage, or if the monthly figure only works because it assumes you'll never exceed 8,000 miles.

One final check that catches more people than any spreadsheet: confirm the scheme's early-termination terms in writing before you order. A £420-a-month car is a good deal for three years. As a £6,000 exit penalty after eleven months, it isn't.