Salary sacrifice vs company car allowance: which wins for EVs in 2026?

7 min read · 11 April 2026. The cash car allowance was the default UK alternative to a company car for two decades. For most UK employees thinking about an EV in 2026, the salary sacrifice route now beats the cash allowance route by £100–£200 per month in net cost — driven by the gap between cash taxed as income and an EV taxed at 3% BIK. This guide walks through the comparison: tax, flexibility, total cost, grey fleet implications, and the BIK trajectory through the rest of the decade. The answer for most EV-buyer drivers is clear; the answer for non-EV drivers, less so.

What a cash car allowance is

A cash car allowance is a fixed monthly cash payment from the employer to the employee in lieu of a company car. The employee uses the cash to acquire and run a vehicle of their own choosing — typically through a personal lease or hire-purchase agreement, or by buying outright. The allowance amount varies by role and seniority; £400–£700 per month is the typical UK range.

Critically, the allowance is treated as additional cash income for tax purposes. It is added to the employee's gross pay and taxed at their marginal income tax rate (20%, 40% or 45%), with employee National Insurance also applied. The employer pays Class 1 secondary NI on the gross allowance.

The employee then takes the post-tax remainder and uses it to pay for whatever vehicle and arrangements they choose. For a 40% rate taxpayer, a £500 gross monthly allowance becomes roughly £260 net (after 40% income tax and 8% NI on the relevant slice).

What salary sacrifice is

Salary sacrifice is the inverse mechanism. Instead of receiving cash and paying tax on it, the employee gives up part of their gross salary in exchange for a non-cash benefit — in this case, the salary-sacrifice EV. The deduction happens before income tax and NI are calculated, so the employee never pays either on the sacrificed amount.

Against the salary sacrifice, the employee picks up a Benefit-in-Kind charge on the vehicle. For a fully electric car in 2025/26, the BIK rate is just 3% of the P11D value — roughly £40 per month of income tax for a 40% rate driver on a £40,000 vehicle. The full mechanism sits in our guide to electric company car BIK rates.

The vehicle itself is provided by the employer (via a scheme provider such as our Perx salary sacrifice EV scheme) on a contract that handles insurance, maintenance, breakdown, roadside assistance and end-of-life return. The employee never owns the vehicle.

Tax comparison: head to head on £500 per month

The cleanest way to compare is on equivalent monthly cost. Take a £500-per-month gross commitment — either £500 of cash car allowance or £500 of salary sacrifice for a £40,000 EV.

Cash car allowance route (40% rate taxpayer):

Gross allowance: £500.
Income tax (40%): −£200.
Employee NI (8% in main band): −£40.
Net cash to employee: £260 per month.
Employee uses £260 to pay personal lease, insurance, fuel, maintenance.

Salary sacrifice EV route (40% rate taxpayer):

Gross sacrifice: £500.
Income tax saved (40%): +£200.
Employee NI saved (8%): +£40.
BIK income tax owed (£40,000 × 3% × 40% / 12): −£40.
Net effective cost to employee: £300 per month — covering the vehicle, insurance, maintenance, breakdown.

The cash allowance gives the employee £260 of post-tax cash to fund a vehicle privately. The salary sacrifice gives them an actual EV — already insured and maintained — for £300 of effective cost. The £40 difference represents the vehicle, insurance, maintenance and breakdown the salary-sacrifice route bundles in. That bundle would cost the personal-lease driver another £200–£300 per month if priced separately on the open market.

Net-of-everything: for a higher-rate driver wanting an EV specifically, the salary sacrifice route is roughly £100–£200 per month cheaper than using the cash allowance to lease the same vehicle privately.

Where the cash allowance wins: flexibility

The cash allowance has one durable advantage: complete flexibility on vehicle choice and contract structure.

The employee can buy a 5-year-old used car for £8,000 and pocket most of the allowance as effective cash. They can lease a vehicle from any lessor with any terms. They can buy a project car and rebuild it. They can choose a non-electric vehicle if their operational requirements (towing, very high mileage, no charging access) make EV impractical. They can keep the vehicle they already own and treat the allowance as pay.

The salary sacrifice route is structurally constrained to the scheme provider's vehicle catalogue, the available contract terms (typically 2–5 years), and EV-only (PHEVs are usually excluded by the scheme structure given the BIK gap to BEVs).

For an employee who wants an EV and has access to a scheme catalogue covering vehicles they want, the constraint is invisible. For an employee with operational requirements that don't match an EV, or who prefers to take the cash and buy outright, the cash allowance is the right answer.

Grey fleet implications

This is the side of the comparison most employers and employees overlook. The cash car allowance creates grey fleet by default — the employee owns the vehicle, the employee insures it (or fails to insure it for business use), the employee handles MOT and tax. Where the journey is on company business, the employer's duty of care under the Health and Safety at Work Act 1974 still applies — but the vehicle and the verification of compliance sit outside the employer's direct visibility.

The salary-sacrifice EV is a clean record from a duty-of-care perspective. The leasing company holds the vehicle, the insurance is contracted through the scheme, MOT and maintenance are handled inside the scheme, and the manufacturer-API data layer is available where the employer is also using our salary sacrifice EV scheme via Orbis.

For employers running larger schemes, this distinction matters operationally. Replacing a 50-employee cash-allowance fleet with a 50-employee salary-sacrifice EV scheme reduces grey fleet exposure to zero on those vehicles — a side benefit alongside the employer NI saving and the staff retention benefit. The wider compliance picture sits in our fleet compliance guide.

The BIK trajectory: 3% now, rising slowly

The salary sacrifice case rests on the EV BIK rate. The published trajectory is:

2025/26: 3%
2026/27: 4%
2027/28: 5%

The 1%-per-year rise is not enough to flip the comparison against the cash allowance at any sensible point in the late 2020s. The cash allowance is taxed at 25% (basic rate + NI) or 48% (higher rate + NI) — the EV BIK rate would need to rise dramatically to close that gap. Even at 10% BIK (a hypothetical late-decade level), the salary sacrifice route still wins comfortably for higher-rate drivers.

This durability is what gives UK employers confidence to sign multi-year scheme commitments. The maths that works in 2026 still works in 2030.

Total cost across the contract

Across a 3-year, 36-month commitment:

Cash allowance (40% rate, £500 gross): £9,360 of post-tax cash received, used to fund a personal lease + insurance + maintenance + fuel/electricity.
Salary sacrifice EV (40% rate, £500 gross): £10,800 of effective cost across 36 months, in exchange for the vehicle + insurance + maintenance + breakdown (fuel/electricity is the employee's own).

The cash allowance route looks £1,440 cheaper on the headline number. But the salary sacrifice route bundles in roughly £6,000–£10,000 of insurance, maintenance and breakdown across the contract — costs the cash-allowance employee would pay separately. Net of the bundled costs, the salary sacrifice route wins by £4,000–£8,000 across the 3-year contract.

For high-mileage drivers, where insurance and maintenance scale up, the gap widens further. For low-mileage drivers in cheap-to-insure cars, the gap narrows but does not flip.

Who should choose which

The decision rule, distilled:

Choose salary sacrifice if: you want a fully electric vehicle, you have charging access (home or workplace), you'll keep the vehicle for the contract term, and you value the bundled insurance/maintenance.
Choose the cash allowance if: you don't want an EV, you want flexibility on vehicle choice or contract structure, you have a vehicle already that you want to keep, your operational requirements (towing, very high mileage, irregular routes without charging) make EV impractical, or you prefer to pocket the allowance as effective extra pay.

For most UK employees in 2026 wanting an EV — the largest cohort by far — salary sacrifice wins on tax, on bundled cost, and on duty-of-care simplicity. The cash allowance retains a durable role for non-EV drivers and edge-case operational profiles.

For employers running both side by side, the salary-sacrifice EV scheme converts their EV-wanting employees onto a cleaner duty-of-care footing while keeping the allowance for the rest. The wider context — including how the scheme integrates with broader fleet planning — sits in fleet intelligence software pricing.

Frequently asked questions

Is salary sacrifice better than a car allowance for EVs?

For an EV specifically, salary sacrifice almost always wins on tax efficiency. The cash car allowance is taxed as income at the employee's marginal rate plus NI. The salary sacrifice EV is gross-deducted before income tax and NI, with only a 3% BIK charge on the vehicle. The difference for a higher-rate taxpayer on a £40,000 EV is typically £100–£200 per month in net cost. The car allowance can win on flexibility (the employee chooses the vehicle and the contract structure freely), but on pure tax it does not.

Can I switch from a car allowance to salary sacrifice?

If your employer offers both, yes. The mechanism is to give up the car allowance (the cash element rolls back into base salary or stops, depending on contract) and take up a salary sacrifice arrangement instead. Many UK employers now offer this dual-track structure precisely so employees can pick. Switch points are usually at the existing allowance vehicle's end-of-contract or at the annual benefit selection window. Specific contract details vary by employer.

What is the tax difference between salary sacrifice and a car allowance?

On a £500-per-month-equivalent package: a £500 cash car allowance is taxed as £500 of additional gross income — meaning a 40% rate driver receives roughly £290 net (after 40% income tax + 8% NI). A £500 salary sacrifice EV is gross-deducted from pay, with the BIK on the vehicle adding back roughly £40 per month of income tax. Net effect: roughly £210 per month of tax saved against the cash allowance route, before the BIK is netted off. The salary sacrifice route is materially better for the EV-buyer profile.

Does salary sacrifice count as grey fleet?

No. Grey fleet refers specifically to employees driving their own personal vehicles for business — owned or leased privately, with the employer reimbursing mileage. A salary-sacrifice vehicle is contracted via the employer's scheme, leased through a leasing company that is a counterparty to the employer, with insurance and maintenance handled inside the scheme. From a duty-of-care perspective, the salary-sacrifice vehicle is functionally a company vehicle: the compliance picture is clean. A cash car allowance creates grey fleet by default, because the employee buys or leases the vehicle privately.