Mileage vs P11D BIK Calculator
Should the director claim mileage on their own car, or take the company car? Get a clear answer for both employer and employee — with VAT, NI, corporation tax and a four-year HMRC BIK forecast all baked in.
See it in 45 seconds
The full UK tax stack, the side-by-side verdict, and a four-year HMRC forecast.
Built for the company car conversation
The numbers a director actually wants to see — and an accountant can defend.
Mileage vs company car
HMRC AMAP mileage allowance for a personal vehicle, side-by-side with a P11D company car.
Full UK tax stack
Income tax band, employer NI, marginal corporation tax relief and 50% VAT reclaim on leases.
EVs and hybrids handled
Electric 4% BIK for 2026/27, CO₂ banding for ICE, and HMRC fuel benefit charge when the employer pays for fuel.
4-year HMRC forecast
Projected appropriate-percentage bands from 2026/27 to 2029/30 — see the cost trajectory, not just today.
A quick tour
Three short steps from car inputs to a defensible mileage-vs-company-car recommendation.
Capture the scenario
Enter mileage, vehicle value, CO₂ or EV status, tax band and company profit so the full tax stack is set up correctly.
- Business miles, vehicle value and CO₂
- EV switch
- Income tax band, employer NI and VAT
- Effective CT auto-calculated
Compare both methods
The calculator places mileage reimbursement and company-car BIK side by side so the employer and employee impact is easy to explain.
- Mileage method card
- P11D / company car card
- Employer and employee view
- Winner badge and net-cost comparison
Forecast four years — and export
Use the HMRC forecast view to show how the BIK story changes over time, then export the branded PDF for the file.
- 4-year HMRC BIK forecast
- Totals and summary line
- Best-for-employer / best-for-employee view
- Branded PDF export
Get the BIK Calculator and the full library
Included in every plan — alongside every other calculator and future tools.
Frequently asked questions
Quick answers on rates, rules and what's included.