An NHS fleet car creates a monthly tax charge called Benefit in Kind, and the fuel type dominates the figure. For 2026/27, a zero-emission electric car with a £35,000 list price costs a basic-rate taxpayer roughly £23 a month in NHS fleet car BIK tax, while a petrol car at the same price with moderate emissions runs closer to £160. The gap is driven almost entirely by the percentage HMRC applies to the car’s list price, which is tied to CO2 emissions.
The Three Numbers That Set Your Monthly Bill
Your taxable benefit for the year is the car’s list price multiplied by a CO2-based percentage. Your actual tax is that figure multiplied by your income tax rate, then divided by twelve.
The list price (sometimes called the P11D value) is the published UK list price on the day before the car was first registered, including VAT, delivery, and number plates.1GOV.UK. How to Work Out the Benefit of a Company Car (480: Chapter 12) The first registration fee is excluded.2GOV.UK. How to Complete P11D and P11D(b) Optional accessories fitted at delivery are added, as are accessories costing £100 or more added later.
The CO2 emissions figure appears on the V5C registration document, in manufacturer specifications, or on your fleet provider’s quote. For plug-in hybrids, the electric-only driving range also matters, because longer electric range brings a lower percentage at the same CO2 level.
Your income tax rate decides how much of the taxable benefit you actually hand over. For 2026/27, England, Wales, and Northern Ireland use 20 percent (£12,571–£50,270), 40 percent (£50,271–£125,140), and 45 percent above that.3GOV.UK. Income Tax Rates and Personal Allowances Scottish taxpayers use different bands. A £5,000 annual taxable benefit costs a basic-rate taxpayer £1,000 a year; a higher-rate taxpayer pays £2,000 for the same car.
BIK Percentages for 2026/27
HMRC sets the percentage each year based on CO2. The 2026/27 bands are:4GOV.UK. Work Out the Appropriate Percentage for Company Car Benefits (480: Appendix 2)
- Zero emissions (pure electric): 4%
- 1–50 g/km with 130+ miles electric range: 4%
- 1–50 g/km with 70–129 miles electric range: 7%
- 1–50 g/km with 40–69 miles electric range: 10%
- 1–50 g/km with under 40 miles electric range: 14–16%
- 51–54 g/km: 17%
- 55–99 g/km: 18–25% (rising in 5 g/km bands)
- 100–154 g/km: 26–36% (rising in 5 g/km bands)
- 155 g/km and above: 37% (maximum)
For 2025/26, zero-emission cars sit at 3 percent, so mid-tax-year payslips may show one point less than the rate above. Zero-emission rates rise by one percentage point each year through 2027/28, reaching 5 percent, then by two points annually after that.
Worked Example: Electric Against Petrol
Take a Band 6 nurse on £37,000, a basic-rate taxpayer, choosing between two cars with a £35,000 list price.
Electric car (4% BIK in 2026/27):
- Annual taxable benefit: £35,000 × 4% = £1,400
- Annual tax: £1,400 × 20% = £280
- Monthly tax: roughly £23
Petrol car (130 g/km CO2, 32% BIK in 2026/27):
- Annual taxable benefit: £35,000 × 32% = £11,200
- Annual tax: £11,200 × 20% = £2,240
- Monthly tax: roughly £187
The electric car costs about £164 less a month in tax. For a higher-rate taxpayer at 40 percent, the monthly figures double to roughly £47 and £373. This is why most new NHS fleet orders are electric or plug-in hybrid.
Salary Sacrifice and the 75 g/km Rule
Most NHS fleet schemes work through salary sacrifice: you accept a lower gross salary and the trust provides the car. The tax treatment depends on emissions. For cars at 75 g/km or below, HMRC uses the normal BIK rules regardless of how much salary you gave up.5GOV.UK. Salary Sacrifice for Employers Above 75 g/km, the taxable amount is the higher of the BIK value or the salary sacrificed. Because a low-emission electric car’s BIK value is almost always lower than the salary sacrificed, this is what makes electric vehicles so tax-efficient through salary sacrifice.
Salary sacrifice also cuts your National Insurance. The deduction comes from gross pay before NI is calculated, so you pay less NI on the lower nominal salary. For a basic-rate employee, the NI saving on the sacrificed amount is typically 8 percent. Employers save their 13.8 percent employer NI too, which is partly why trusts can offer these schemes at attractive rates.
The monthly deduction from gross pay usually bundles the car, comprehensive insurance, servicing and maintenance, breakdown cover, road tax, and tyre replacement for normal wear. Fuel and charging sit outside that. Details vary by trust and provider, so read the scheme documentation before signing.
What This Does to Your NHS Pension
Because gross salary drops by the amount sacrificed, pensionable pay drops with it. The 2015 NHS Pension Scheme, which covers virtually all active members, is career-average, so every year of lower pensionable pay means slightly less pension built up for that year. The reduction is permanent for any year you were in the scheme.
Death-in-service and ill-health retirement benefits are also linked to pensionable pay, so those fall too. For most employees choosing a reasonably priced electric car, the tax and NI savings outweigh the pension reduction. If you are close to retirement or have only a short time left in the scheme, run the numbers first. Your trust’s HR or pensions team can model the specific impact.
Cutting the Taxable Benefit
Capital Contributions
A payment toward the cost of the car or its accessories is deducted from the figure used in the BIK calculation, capped at £5,000 no matter how much you actually contribute.6GOV.UK. Employment Income Manual – EIM24355 – Car Benefit Calculation Step 3: Capital Contributions Contributions can be a lump sum, spread across the year, or made in earlier years, as long as they go toward the cost of the car or qualifying accessories.2GOV.UK. How to Complete P11D and P11D(b)
On the £35,000 electric car at 4 percent, a full £5,000 contribution cuts the annual taxable benefit from £1,400 to £1,200, saving a basic-rate taxpayer about £3.33 a month. Capital contributions matter more on higher-emission cars where the percentage is larger.
Payments for Private Use
If your fleet agreement contractually requires payments from your after-tax pay for the right to use the car privately, those payments are subtracted from the provisional sum in the BIK calculation.7GOV.UK. Employment Income Manual – EIM25261 – Car Benefit Calculation Step 8: Payments for Private Use Three conditions apply: the payment must be a contractual requirement for private use, it must come from net pay, and it must be made within the tax year or by 6 July following. These payments cut the taxable benefit pound for pound. If they exceed the provisional sum, the benefit drops to zero.
Fuel Benefit (Usually Doesn’t Apply)
If your employer pays for private-use fuel, a separate benefit applies on top of the car benefit. It uses a fixed annual figure (£28,200 for 2025/26) multiplied by the same BIK percentage. On a petrol car at 32 percent, that adds £9,024 to the annual taxable benefit, roughly £150 a month at basic rate. On an electric car at 4 percent, it would be £1,128 a year, about £19 a month.
Most NHS salary sacrifice schemes don’t provide private-use fuel, so this rarely applies. If yours does and you want to avoid the charge, you must reimburse the full cost of all private fuel. Partial reimbursement doesn’t help.
How the Charge Reaches Your Payslip
When you take delivery, your trust or fleet manager sends a P46(Car) form to HMRC.8GOV.UK. Tell HMRC About a Car Provided to an Employee for Private Use HMRC then adjusts your tax code, usually by reducing your personal allowance so the tax is collected through PAYE each month. A Notice of Coding confirms the change by post or through the HMRC app.
If your code hasn’t updated within a few weeks, you can check and update the car details yourself through the GOV.UK service.9GOV.UK. Check or Update Your Company Car Tax Sorting this promptly matters. If the code isn’t adjusted and you underpay during the year, HMRC collects the shortfall later, usually by reducing your allowance the following year, which creates a catch-up period where take-home drops more than expected.
The Early Exit Trap
NHS salary sacrifice leases typically run three or four years, and leaving early is expensive. If you resign, retire, are dismissed, or face prolonged absence, the lease usually terminates and you become liable for the leasing company’s early termination charge. Excess mileage and damage beyond normal wear can add to that. Most trusts cover the termination cost only in limited circumstances such as redundancy, death in service, or ill-health retirement.
Before signing, be confident you’ll stay in your role for the full lease term. If there’s a realistic chance of leaving within the next few years, factor the potential termination costs into the decision. The fleet provider’s terms document spells out exactly which exit scenarios the trust absorbs and which land on you.