Benefits in Kind (P11D) Calculator
Calculate tax on company benefits — car, medical insurance, gym, phone and more. See monthly tax impact.
Last updated: April 2026 · Source: HMRC - Tax on Company Benefits
Benefits in Kind (annual value)
Company Car
Based on P11D value x BiK rate
Fuel Benefit
Car fuel for private use
Private Medical Insurance
Premium paid by employer
Gym Membership
If paid directly by employer
Personal Phone Use
If employer pays your phone bill
Living Accommodation
Annual value of accommodation
Beneficial Loans
Interest-free/low-interest loans over £10K
Other Benefits
Vouchers, subscriptions, etc.
Tax on Your Benefits
£160.00/year
£13.33/month (collected via tax code)
Total BiK Value
£800.00
Your Tax Rate
20.00%
Employer Class 1A NI
£16.00
BiK tax is collected by adjusting your tax code (reducing your Personal Allowance). Your employer reports benefits on form P11D by 6 July after the tax year.
Disclaimer
This calculator is provided for informational purposes only and should not be considered as financial or tax advice. All calculations are performed locally in your browser — no personal data is collected or sent to our servers. Rates and thresholds are sourced from HMRC and GOV.UK and are updated for the current tax year. Always verify results with HMRC or consult a qualified professional before making financial decisions.
How It Works
HMRC taxes workplace benefits by converting them into a cash equivalent value, which is then taxed at your marginal income tax rate. Each benefit type has its own valuation method defined in the Income Tax (Earnings and Pensions) Act 2003. Your employer reports these values annually on form P11D, and HMRC adjusts your tax code to collect the additional tax owed through PAYE.
Company car benefit is calculated by multiplying the car's P11D price (list price plus accessories, minus capital contributions up to £5,000) by the appropriate percentage based on CO2 emissions. For 2025/26, zero-emission vehicles attract a 2% rate, rising in 1% increments through to 37% for the highest polluters. The resulting cash equivalent is added to your taxable income.
Private medical insurance benefit equals the cost your employer pays for the policy premium. Accommodation benefit uses the annual value or, if the property cost exceeds £75,000, adds a supplementary charge calculated as the excess multiplied by the official rate of interest (currently 2.25%).
Company car and medical insurance BiK calculation
- Company car P11D price: £35,000, CO2 emissions 120g/km giving a 29% benefit rate
- Car benefit cash equivalent: £35,000 x 29% = £10,150
- Employer-paid medical insurance premium: £1,200 per year
- Total taxable benefit: £10,150 + £1,200 = £11,350
- Tax due at 20% basic rate: £11,350 x 20% = £2,270 per year (£189.17/month via adjusted tax code)
Source: HMRC - Tax on Company Benefits
Frequently Asked Questions
- What does the Benefits in Kind (P11D) Calculator do?
- Calculate tax on company benefits — car, medical insurance, gym, phone and more. See monthly tax impact. All calculations are performed in your browser using official UK rates and thresholds.
- Is this calculator based on 2025/26 rates?
- Yes. This calculator uses the current 2025/26 UK tax year rates for income tax, National Insurance and other deductions, effective from 6 April 2025.
- Does this include pension contributions?
- This calculator can factor in workplace pension contributions. Under auto-enrolment, the minimum is 8% total (5% employee + 3% employer) of qualifying earnings.