UK Tesla calculator
Tesla Salary Sacrifice Calculator (UK)
Salary sacrifice is the biggest reason UK drivers can afford a Tesla. This tool shows your net monthly cost after income-tax and National Insurance relief, with the low electric-car Benefit-in-Kind tax added back — using published HMRC rates.
Your figures
All figures are editable estimates, checked 2026-07-13. We never present a rate as fixed fact — see our sources.
Result
Estimate only — confirm live figures with Tesla and your suppliers.
How this is worked out
You sacrifice gross salary, so you save income tax + NI at your marginal rates; then you pay a small Benefit-in-Kind tax on the car (list price × BiK% × your tax rate). Net = sacrifice − relief + BiK. EV BiK rates are the published HMRC figures (3% / 4% / 5% for 2025/26–2027/28), checked 2026-07-13. This is guidance, not advice — your scheme's exact terms (early-exit, insurance, tyres) vary. Source: GOV.UK company-car tax.
How the £407.99 / mo figure above is calculated
Using this page's default inputs — £600/mo gross sacrifice, 40% income tax, 2% NI, 4% BiK on a £44,990 P11D price — here is every step.
- Combine your tax and NI relief rate.
relief% = tax% + NI%= 40% + 2% = 42%. - Apply relief to the sacrifice.
after relief = sacrifice × (1 − relief%)= £600 × 58% = £348.00 — so you've saved £252.00 / mo in tax and NI. - Work out the monthly Benefit-in-Kind tax.
BiK = (P11D price × BiK% × tax%) ÷ 12= (£44,990 × 4% × 40%) ÷ 12 = £59.99 / mo. - Add the BiK tax back on. £348.00 + £59.99 = £407.99 / mo net cost from your payslip.
- Compare with paying the full amount from net pay. £600.00 − £407.99 / mo = £192.01 / mo saved, or 32% of the gross sacrifice.
Change your tax band, NI rate, BiK% or the car's list price above and the same five steps recompute live. This is guidance, not financial advice — your employer's scheme terms (early-exit fees, insurance, tyres) vary. Source: GOV.UK company-car tax. Full list: Methodology & sources.
What the monthly figure above can't tell you
The arithmetic of salary sacrifice is genuinely favourable for an EV, and the number above reflects that. But a monthly net cost hides four things that decide whether the arrangement suits you, and none of them are in the calculation.
- It is tied to your employment. Leaving, redundancy or long-term absence typically brings early-termination costs, and those can be substantial on a car with years left to run. Ask your employer what happens in each of those cases before you commit — the answer varies by scheme and some employers absorb it while others don't.
- Your gross salary falls, and other things are calculated from it. Employer pension contributions are often a percentage of salary, and lenders assess affordability on gross income. A sacrifice large enough to help your tax bill can also reduce your pension contributions or your mortgage headroom. Worth checking if either is live for you.
- The BiK rate is scheduled upward. EV company-car tax rises in steps across the next few years. On a three- or four-year term your BiK cost is not flat — it climbs every April while your sacrifice stays the same, so the net saving narrows over the life of the arrangement.
- It doesn't suit everyone. If sacrificing salary would take you near the personal allowance or below the National Minimum Wage for your hours, schemes typically won't permit it — and if you already sacrifice heavily for pension, the headroom may not exist.
Why the escalating rate changes the timing question
This is the one genuinely counter-intuitive consequence, and it runs opposite to most car-buying advice. Because the BiK percentage is set by tax year and rises on a published schedule, starting earlier means more of your term sits in the cheaper years. Waiting for a better deal on the car can be outweighed by moving your whole term one year up the escalator.
So on salary sacrifice specifically, "should I wait?" has a different answer than it does for a cash purchase. That's worth modelling with your provider across the actual term rather than judging on a single month's figure — including the one above.
The questions to put to your scheme provider
Five, and the answers are what turn the calculator's output into a real decision:
- What happens if I leave, am made redundant, or go on extended leave?
- Is the BiK escalation across my whole term shown in your quote, or only the first year?
- What's included — insurance, maintenance, tyres, breakdown — and what isn't?
- What is the mileage limit, and what is the excess-mileage charge?
- Does the sacrifice affect my employer pension contribution?
This page models the tax mechanics; it is not financial advice and it cannot see your scheme's terms. BiK percentages and thresholds are set by HMRC and revised — confirm current rates on GOV.UK and your own figures with your employer or provider before committing.
Questions
How does Tesla salary sacrifice save money in the UK?
You give up gross salary for the car, avoiding income tax and National Insurance on that amount. Electric cars carry a very low Benefit-in-Kind rate (4% in 2026/27), so the tax you pay back is small — the net cost from your payslip is well below a personal lease.
Will the low BiK rate on electric cars last?
Published HMRC rates rise gradually: 3% in 2025/26, 4% in 2026/27 and 5% in 2027/28 — still far below petrol/diesel cars. Always confirm the current year's rate before you commit.