Salary Sacrifice EV Scheme Calculator
See your real monthly saving from a salary sacrifice electric car scheme, after tax relief, National Insurance, and BIK tax.
How do salary sacrifice EV schemes work?
You agree to give up ("sacrifice") part of your gross salary in exchange for your employer providing an electric car, usually via a lease. Because the sacrifice comes out of your salary before income tax and National Insurance are calculated, you don't pay tax or NI on that portion of your pay — which is where the saving comes from.
You still pay Benefit-in-Kind (BIK) tax on the car itself, exactly as a company car driver would — but because EVs currently sit on very low BIK bands (see our Company Car Tax Calculator for the exact percentages), that tax is usually small compared to the income tax and NI you save on the sacrificed salary.
3 worked examples
Example 1 — Higher-rate taxpayer, mid-range EV
£500/month gross sacrifice, £35,000 P11D EV, higher-rate taxpayer (40%), 2% NI rate, 2026/27 tax year (4% EV BIK rate).
£500 × 40% = £200
NI relief:£500 × 2% = £10
BIK tax owed:(£35,000 × 4% ÷ 12) × 40% = £46.67/month
Net monthly cost:£500 − £200 − £10 + £46.67 = £336.67 — a saving of £163.33/month (around £1,960/year)
Example 2 — Basic-rate taxpayer, more affordable EV
£400/month gross sacrifice, £28,000 P11D EV, basic-rate taxpayer (20%), 8% NI rate, 2026/27 tax year.
£400 × 20% = £80
NI relief:£400 × 8% = £32
BIK tax owed:(£28,000 × 4% ÷ 12) × 20% = £18.67/month
Net monthly cost:£400 − £80 − £32 + £18.67 = £306.67 — a saving of £93.33/month (around £1,120/year)
Example 3 — Same sacrifice, more expensive EV
Same £500 sacrifice and 40%/2% tax position as Example 1, but a £55,000 P11D EV instead of £35,000.
(£55,000 × 4% ÷ 12) × 40% = £73.33/month — notably higher than Example 1's £46.67
Net monthly cost:£500 − £200 − £10 + £73.33 = £363.33 — a saving of £136.67/month, about £27 less per month than Example 1
Example 3 shows something important: a more expensive car doesn't just cost more in sacrifice, it also increases your BIK tax, since BIK is calculated on P11D value. The saving shrinks slightly as the car gets pricier relative to the sacrifice amount, even though the tax rate itself hasn't changed.
Why only EVs get the big saving
Salary sacrifice used to be popular for a much wider range of benefits — including higher-emission cars — until HMRC introduced Optional Remuneration Arrangement (OpRA) rules in April 2017. These rules removed most of the tax advantage for salary sacrifice on benefits that could otherwise be bought with cash, including most cars.
Ultra-low emission vehicles, and fully electric vehicles in particular, were carved out as an exception specifically to encourage EV uptake. This is why salary sacrifice car schemes today are overwhelmingly EV-only — the tax advantage for petrol, diesel, or hybrid cars through salary sacrifice has largely disappeared under OpRA.
What it saves your employer
Separately from your own saving, your employer also avoids paying Class 1 National Insurance on the sacrificed portion of your salary, at the current employer rate of 15%. This is part of why many employers are willing to run these schemes at no extra cost to themselves — the employer NIC saving can offset the administrative cost of running the scheme.
The real downsides to know before joining
Salary sacrifice schemes are usually presented purely as a saving, but there are genuine trade-offs worth understanding first:
- Your official salary is reduced for the duration of the sacrifice, which can affect mortgage affordability assessments, other salary-linked benefits, and life insurance calculated as a multiple of salary
- Pension contributions may be affected if yours are calculated as a percentage of salary — a lower salary can mean lower pension contributions unless your scheme specifically protects this, which is worth checking directly with HR
- Statutory pay calculations can be affected — maternity, paternity, and sick pay are sometimes calculated on your reduced salary, depending on scheme rules
- You can't simply cancel mid-agreement in most schemes — leaving your job, or wanting to exit early, is usually only possible under specific circumstances set by the scheme provider
- National Minimum Wage floor — your sacrifice cannot legally take your gross pay below the National Minimum Wage, which can limit how much higher earners near this threshold are able to sacrifice
What this calculator can't tell you
Your exact scheme's terms
Salary sacrifice EV schemes vary by provider — some include insurance, maintenance, and charging costs within the sacrifice; others don't. This calculator only handles the tax and NI mechanics, not what's actually included in your specific quoted lease figure.
The effect on your pension
If your pension contribution is a percentage of salary, a reduced salary from sacrifice could mean a smaller pension contribution over time. This calculator doesn't model that — check directly with your scheme or HR department.
Mortgage or benefit affordability impact
A reduced official salary can affect mortgage applications and other income-based assessments during the sacrifice period. This is a real cost some people don't consider until they need it.
Common mistakes
Only looking at the headline saving figure
Marketing materials for these schemes often lead with an attractive top-line saving without clearly showing the BIK tax deduction — always check the net figure, not just the tax and NI relief in isolation.
Not checking the pension impact
This is the most commonly overlooked downside. If your employer calculates pension contributions as a percentage of your post-sacrifice salary rather than your original salary, you could be quietly reducing your retirement savings for the sake of a monthly car saving.
Forgetting non-EV cars barely benefit
Since the 2017 OpRA rules, the salary sacrifice tax advantage for petrol, diesel, and most hybrid cars has largely disappeared — if you're offered a scheme for a non-EV, check the actual numbers carefully rather than assuming the same saving applies.
Assuming the scheme is free to exit early
Leaving before the agreed term, whether due to changing jobs or changing your mind, is usually restricted or costly. Understand the exit terms before signing up.
Before you join a scheme
- Ask HR directly whether pension contributions are protected during the sacrifice period — this is the single most important question to ask
- Get the exact P11D value of the specific car and trim you're considering, not a general estimate, since BIK tax depends on it precisely
- Check what's included in the quoted lease figure — insurance, maintenance, and charging inclusion varies significantly by scheme
- Understand the exit terms if you change jobs or circumstances change during the agreement
- Consider the mortgage/affordability angle if you're planning a house move or major credit application during the sacrifice period
🚗 Compare against a standard company car
See how EV Benefit-in-Kind tax works on its own, without the salary sacrifice mechanics layered on top.
Use the Company Car Tax Calculator →How we calculate
Income tax relief = gross sacrifice × your income tax rate. NI relief = gross sacrifice × your selected NI rate.
BIK monthly tax = (P11D value × EV BIK % for the selected tax year ÷ 12) × your income tax rate — using the same EV BIK bands (3% for 2025/26, 4% for 2026/27, 5% for 2027/28) as our Company Car Tax Calculator.
Net monthly cost = gross sacrifice − income tax relief − NI relief + BIK tax owed. Monthly saving = gross sacrifice − net monthly cost.
Employer NIC saving (shown for context) = gross sacrifice × 15%.
Frequently asked questions
How much can I save with a salary sacrifice EV scheme?
It depends on your tax band, NI rate, and the car's P11D value, but many higher-rate taxpayers see net monthly savings in the range of £100–£200 compared to funding the same lease from take-home pay, after accounting for BIK tax on the car.
Why do salary sacrifice schemes only offer electric cars?
Since HMRC's 2017 Optional Remuneration Arrangement rules, most of the tax advantage for salary sacrifice on cars was removed, except for ultra-low emission and fully electric vehicles, which were specifically exempted to encourage EV adoption.
Does salary sacrifice affect my pension?
It can, if your pension contributions are calculated as a percentage of salary and your scheme doesn't protect against this. Always check directly with your employer's HR or pension provider before joining a scheme.
Do I still pay tax on the car through salary sacrifice?
Yes. You pay Benefit-in-Kind (BIK) tax on the car itself, at the same rate as a standard company car. For electric vehicles this rate is currently low (3–5% depending on the tax year), which is why the overall scheme usually still results in a net saving despite this tax.
Can I leave a salary sacrifice scheme early?
Usually only under specific circumstances set by the scheme provider, such as leaving your job or another qualifying life event. Exiting simply because you've changed your mind is typically restricted or may carry a cost — check your specific scheme's terms before joining.
References & data sources
- HMRC — Optional Remuneration Arrangements (OpRA) guidance. The official rules governing which benefits, including cars, retain a tax advantage when provided via salary sacrifice.
- GOV.UK — Rates and thresholds for employers. Official EV Benefit-in-Kind percentage bands and employer National Insurance rates, used directly in this calculator.
- GOV.UK — National Minimum Wage rules. The legal floor that salary sacrifice arrangements cannot reduce pay below.
Salary sacrifice involves real changes to your official salary, with potential knock-on effects for pensions, mortgages, and other income-linked assessments. This calculator is a planning estimate — always confirm the full picture with your employer's scheme provider and, if needed, an independent financial adviser before joining.