How This Tool Works
📋 Purpose
EV salary sacrifice is the single best tax deal available to UK employees: the 4% BiK charge on electric cars in 2026/27 creates tax efficiencies worth £100–£400/month for higher-rate taxpayers. But employer quotes show a gross monthly figure — not the net monthly outlay you'll actually feel on your payslip. This calculator nets off income tax, NI, student loan, pension impact and BiK so you can compare the three real-world options (salary sacrifice / cash purchase / combustion lease) on the same basis.
⚙️ How It Works
- 1Enter your gross annual salary, region, pension % and student loan plan.
- 2Enter the employer salary sacrifice quote (gross monthly).
- 3Enter the EV P11D value and the BiK year (26/27 = 4%)
- 4Add a cash-buy price and holding period for the comparison.
- 5Add a combustion lease baseline + annual mileage.
- 6We apply tax bands, NI, student loan and BiK using HMRC rules.
- 7We model cash-buy depreciation + opportunity cost @ 4.75%.
- 8Press Calculate to see three-scenario net monthly comparison.
Salary Sacrifice EV Net Cost — 2026/27
Compare salary sacrifice EV vs cash purchase vs combustion lease on true net monthly cost.
BiK on electric company cars is 4% for 2026/27 (rising to 9% by 2029/30), making salary sacrifice the strongest EV-ownership route for basic- and higher-rate taxpayers. This tool nets off income tax, NI, student loan, pension and BiK charges so you see the real monthly outlay.
Salary & tax details
EV details
The employer-quoted salary sacrifice amount.
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Complete Guide: Salary Sacrifice EVs in the UK
How EV salary sacrifice works, when it beats cash purchase, and the 2026/27 BiK rates that make electric company cars the best tax deal in the UK.
📅 Last updated: May 2026
Quick Tips
Jump-start your understanding with these essential tips
EV BiK is 4% for 2026/27. A £50,000 EV creates £2,000 of benefit, taxed at 20/40/47% = £400–£940/year. Combustion cars sit at 25–37% BiK — roughly 8× more tax.
Ask HR whether your pension is based on pre-sacrifice or post-sacrifice salary. "Protected pensionable pay" schemes make salary sacrifice almost free in pension terms.
Most schemes offer to sell you the car at Guaranteed Future Value after 3–4 years. If the market value exceeds GFV (common on desirable EVs), you can buy and resell for a profit.
If your sacrifice drops gross below £23,809/year, employers must block it. Part-time and lower-paid workers are often locked out of the best tax deal in the UK. Target a sacrifice no higher than 25% of gross.
Legitimate salary sacrifice is run by your employer. Companies offering "DIY salary sacrifice" or charging fees to set it up are almost always regulated lease products without the tax benefit. Always go via HR.
Step-by-Step Guide
Follow these steps to get the most from this tool
Ask HR or your fleet provider (Octopus EV, Tusker, Zenith, Loveelectric etc.) for a quote. You need: monthly gross lease, P11D value, term, maintenance/insurance inclusions, and BiK year.
Gross annual salary, region (England/NI/Wales or Scotland), pension %, student loan plan. These drive the effective tax rate on the sacrificed amount.
Monthly gross lease (from employer quote), P11D value (typically OTR price minus £0 delivery), BiK year, cash-buy price for the same model, and holding period for the cash comparison.
What would a comparable combustion lease cost monthly? The tool adds fuel (45mpg @ £1.45/l) and insurance to give you the true combustion run-cost for the same mileage.
The bar chart shows the three scenarios side-by-side. The breakdown cards show what makes up each scenario's monthly cost. The winner is highlighted emerald.
If sacrifice breaches NMW, exceeds 30% of salary, or triggers the PA taper, you'll see an alert. These aren't deal-breakers but change the analysis.
Dedicated card shows the annual pension contribution loss. If it's £200+ per year, ask HR about pension protection — some schemes offer it as a tick-box option.
Advanced Topics
Deep dives for advanced users
2025/26 BiK rates: pure EV 3%, PHEV (30–39 mi range) 12%, PHEV (40+ mi) 7%, diesel Euro 6d 28–37%, petrol 25–37%. An EV at 3% on a £50k P11D creates £300–£705 annual tax. The same price combustion creates £3,000–£8,325 — roughly 10× more tax.
Most salary sacrifice contracts offer an optional purchase at Guaranteed Future Value (GFV) after 3–4 years. GFVs are set conservatively by lease companies. EV residual values often exceed GFV, meaning you can buy and immediately resell for £2k–£5k profit — effectively a tax-free bonus at end of term.
Lease quotes assume a specific annual mileage (typically 8,000–10,000). Exceeding the contracted mileage triggers excess charges of 8–12p per mile. At 15,000 miles vs a 10,000 cap, that's £400–£600/year extra. Either choose a higher cap upfront (adding £15–£30/mo) or use this calculator's real mileage input to check sensitivity.
Some households run one combustion + one EV on sacrifice. The combustion handles long trips (less depreciation) while the EV on sacrifice handles commuting (maximising tax efficiency). The cash-purchase scenario models this for the non-sacrifice partner.
Compare a BiK company car vs cash allowance via the Company Car vs Cash Allowance Calculator. If you enter zones regularly, add cost with the Clean Air Zone / ULEZ Daily Cost Calculator. Model home vs public EV charging costs with the EV Charging Cost & Route Planner.
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