EV Salary Sacrifice vs Personal Purchase 2026/27: The Full Tax Breakdown

Electric vehicles and salary sacrifice have become one of the most talked-about employee benefits in the UK. With the benefit in kind (BIK) rate fixed at just 4% for fully electric cars and salary sacrifice exempted from the optional remuneration arrangement (OpRA) rules, the tax maths can look almost too good to be true. This guide works through the numbers honestly for 2026/27 so you can decide whether salary sacrifice or personal purchase makes more sense for your situation.

How EV Salary Sacrifice Works

Under a salary sacrifice arrangement you agree with your employer to give up part of your gross salary in exchange for a non-cash benefit -- in this case, use of an electric vehicle. Because the sacrifice reduces your gross pay, you pay less income tax and less employee National Insurance on that portion of your earnings. The car is leased by your employer and you make no personal hire purchase payments.

The benefit is not completely free of tax. You are liable for income tax on the BIK value, which is calculated as:

BIK value = list price x BIK rate

For fully electric vehicles the BIK rate in 2026/27 is 4%. So a GBP 40,000 EV produces a BIK of GBP 1,600 per year. You pay income tax on that GBP 1,600 -- GBP 320 if you are a basic-rate taxpayer, GBP 640 if you pay higher rate. There is no employee NI on BIK values, only income tax.

The 28% Basic-Rate Saving Explained

A basic-rate taxpayer sacrificing salary saves:

• 20% income tax on every pound sacrificed
• 8% employee National Insurance (on earnings up to GBP 50,270)
• Total combined rate: 28%

Against this you pay 20% income tax on the BIK value. The net saving depends on how the BIK compares with the sacrifice amount.

Worked Example: GBP 40,000 EV, GBP 550/Month Lease

Let us say your employer has negotiated a lease on a GBP 40,000 electric car at GBP 550 per month gross. Here is how the 2026/27 numbers stack up for a basic-rate taxpayer.

Personal Cost Without Salary Sacrifice (Buying or Leasing Personally)

If you leased this car personally you would pay GBP 550 per month out of take-home pay. To fund GBP 550 net you need gross earnings of around GBP 764 at basic rate (GBP 550 / 0.72). Over twelve months that is GBP 9,168 of gross salary consumed.

Salary Sacrifice Route

Your effective monthly cost falls from GBP 550 to roughly GBP 423 -- a saving of GBP 127 per month or GBP 1,528 per year.

Higher-Rate Taxpayer

A higher-rate taxpayer saves 40% income tax plus 2% employee NI (above GBP 50,270) or 8% below that threshold -- call it 42% or 48% combined depending on where you sit. The BIK tax rises to 40% of GBP 1,600 = GBP 640. Even so, the net saving is larger in absolute terms than for a basic-rate payer.

Employer National Insurance Saving

Employers pay 15% secondary NI on salary above the secondary threshold, which is GBP 5,000 per year in 2026/27. On a GBP 6,600 annual sacrifice the employer saves:

GBP 6,600 x 15% = GBP 990 per year

Many forward-thinking employers pass this saving back to employees, either reducing the gross lease cost or adding it as an explicit contribution. If your scheme passes back the full GBP 990, your annual saving climbs to GBP 2,518 -- roughly GBP 210 per month.

Always check your employer's policy before signing up. Ask HR: "Does the scheme pass back the employer NI saving?"

The OpRA Exemption -- Why EVs Are Special

The optional remuneration arrangement rules introduced in April 2017 were designed to stop employees using salary sacrifice to avoid tax on expensive benefits. Under OpRA, the taxable value of most benefits offered via salary sacrifice is the higher of the BIK value or the salary foregone. This wiped out most of the advantage for petrol and diesel company cars.

Fully electric vehicles (and ultra-low emission vehicles below 75g/km CO2) are specifically excluded from OpRA. This means the BIK is always calculated on list price x 4%, regardless of how much salary you sacrifice. The full 28% saving at basic rate is preserved.

Home Charging: The 9p/Mile Exemption

If you charge your company electric car at home, your employer can reimburse you at 9 pence per mile for business journeys without any tax or NI consequence. This is the HMRC-approved electricity rate for EVs. Keeping a mileage log is essential to claim this properly.

Workplace charging is also a tax-free benefit -- employers can install charging points and allow employees to charge at work with no BIK arising, provided the charger is available to all employees, not just directors.

EV Salary Sacrifice vs Personal Purchase: When Does Personal Purchase Win?

Salary sacrifice is not always the right choice. Consider personal purchase if:

• You drive fewer than 5,000 miles a year (the saving shrinks with fewer miles and lower usage)
• Your employer does not offer a scheme or charges an administration fee that erodes the benefit
• You want to customise the car or keep it beyond the lease term
• You are close to the GBP 12,570 personal allowance and sacrifice would take your taxable pay below it, wasting the PA
• Your total income is between GBP 100,000 and GBP 125,140 -- sacrifice can actually restore your personal allowance, which is tapered at GBP 1 for every GBP 2 over GBP 100,000, creating a 60% effective saving rate

Key Checklist Before Signing Up

1. Confirm the car is 0g/km CO2 (fully electric) to ensure the 4% BIK and OpRA exemption apply
2. Ask for the gross and net monthly cost and confirm what happens if you leave the employer mid-lease
3. Check whether your employer NI saving is shared
4. Verify the lease includes servicing, insurance and tyres -- cheaper deals sometimes exclude these
5. Run the numbers if you pay higher rate or if your income is near GBP 100,000

Use the CalcHub salary sacrifice calculator to model your specific gross salary, lease cost and tax position for 2026/27. It handles basic rate, higher rate and the personal allowance taper so you see the real monthly saving before you commit.