P11D BIK Valuation Rules UK 2026/27: Cars, Medical, Loans, Housing

The cash-equivalent value of every benefit in kind (BIK) on your P11D is what HMRC taxes you on - not what your employer paid for it. Each BIK has its own valuation rule, and getting them wrong is one of the most common P11D errors. This guide walks through the major BIK classes for 2026/27.

How a P11D becomes a tax bill

Each BIK on your P11D has a cash-equivalent value. HMRC adds these up, deducts the total from your Personal Allowance, and your tax code drops accordingly. The recovery happens via PAYE in the following tax year - typically a code-change letter (P2) arriving February-April, with the new code taking effect from 6 April.

A £6,000 cumulative BIK total reduces your PA by £6,000. For a basic-rate taxpayer, that's £1,200 of additional PAYE tax across the year (£100/month). For a higher-rate taxpayer, £2,400 (£200/month). For someone in the £100k-£125k taper zone, £3,720 (62% effective rate).

Company cars (the big one)

The company car BIK is the most-checked and most-misunderstood. The 2026/27 calculation:

BIK value = P11D list price × CO2-banded percentage
         + (fuel benefit if applicable)
         - capital contribution (if you paid towards the car)
         - employee contributions for private use

The CO2-banded percentage table (2026/27)

CO2 (g/km)	Petrol	Diesel (RDE2 compliant)
0 (pure EV)	2%	2%
1-50 (electric range >130 mi)	2%	2%
1-50 (electric range 70-129 mi)	5%	5%
1-50 (electric range 40-69 mi)	8%	8%
1-50 (electric range 30-39 mi)	12%	12%
1-50 (electric range under 30 mi)	14%	14%
51-54	15%	15%
55-59	16%	16%
60-64	17%	17%
65-69	18%	18%
70-74	19%	19%
75-79	20%	20%
...	...	...
170+	37%	37% (capped)

(Diesel cars not RDE2 compliant add 4% to the percentage, capped at 37%.)

Fuel benefit

If the employer pays for any private fuel (even a single tank), the fuel benefit is calculated on a separate scale:

Fuel BIK 2026/27 = £27,800 × the same CO2 percentage as the car

A 22% car gives a fuel BIK of £6,116 - £2,447/year of additional tax for a higher-rate taxpayer. For most drivers, the cost of accepting employer fuel exceeds the actual fuel value. Many drivers pay back the private-fuel cost and avoid the BIK entirely.

Worked example: £35,000 car at 22% CO2 band

P11D list price:           £35,000
× 22% (60g/km diesel RDE2):  22%
                          --------
Annual BIK:                  £7,700

Higher-rate taxpayer (40%):  £3,080/year tax
Basic-rate taxpayer (20%):   £1,540/year tax

Private medical insurance

Valued at the premium your employer paid for the year. If the policy includes you + family members (spouse, partner, children), the employer's full per-employee premium is taxable.

Example: employer pays £1,400/year for your medical insurance.

• BIK value: £1,400
• Higher-rate tax: £560/year
• Basic-rate tax: £280/year

Common errors:

• Premium changed mid-year but P11D shows annual; reconcile against your insurer's annual statement.
• You opted out of family cover but P11D still shows family premium.
• You left the scheme mid-year but P11D shows the full annual premium.

Beneficial loans

If your employer makes you an interest-free loan (or low-interest loan) above £10,000 at any point in the tax year, the BIK is the HMRC official rate × the average loan balance.

For 2026/27, the official rate is 2.25% (subject to change in HMRC's Statement of Practice - check current rate).

Worked example: interest-free £25,000 loan held all year.

Average loan balance:        £25,000
× HMRC official rate (2.25%):    £562.50

Annual BIK:                  £562.50

Higher-rate tax:             £225/year
Basic-rate tax:              £112/year

If the loan crosses the £10,000 threshold mid-year (e.g. balance goes from £15,000 to £8,000), the BIK applies for the months the balance was above £10,000 only.

Living accommodation

Three calculation routes depending on whether the accommodation is "necessary for proper performance of duties":

Route 1 - Job-related accommodation (necessary)

Fully exempt. Examples: vicars, lighthouse keepers, school caretakers, agricultural workers in tied housing.

Route 2 - Standard formula (most cases)

BIK = annual value (Council Tax band-equivalent rental value)
     + (cost of providing × HMRC official rate, where cost > £75k)
     + utilities and services (if employer pays)
     - employee contribution

For a typical urban flat, the annual value is £15,000-£40,000 depending on location.

Route 3 - Alternative formula (high-cost accommodation)

If the property cost the employer over £75,000 to acquire, an additional charge applies on top of Route 2:

Additional charge = (cost of provision − £75,000) × HMRC official rate (2.25%)

This catches employer-provided London accommodation for senior executives.

Beneficial loans below the £10,000 threshold

If your loan balance never exceeds £10,000 across the tax year, no BIK applies. Useful for short-term salary advances and small staff loans.

Vouchers and credit cards

Vouchers (gift cards, petrol vouchers) are valued at face value unless statutorily exempt. The taxable amount goes on the P11D unless processed through PAYE in real time.

Trivial benefits up to £50 each (max 6/year per director) are exempt.

Christmas hampers and similar one-off gifts above £50 each are fully taxable.

Mobile phones, broadband, and IT equipment

• One employer-provided mobile phone per employee: exempt.
• Two or more phones: only the first is exempt; subsequent phones are taxable on the cost.
• Broadband for home working: exempt if there is a clear business need.
• Computer equipment provided for work use: exempt if the private use is "not significant" (HMRC accepts incidental personal use).

Travel and subsistence (most exempt)

• Business travel (excluding ordinary home-to-permanent-workplace commute): expenses reimbursed at HMRC's mileage allowance rates are exempt.
• Travel to a temporary workplace (less than 24 months): exempt.
• Subsistence during business travel: typically exempt at HMRC's "scale rates" (£5 for one meal, £10 for two, £25 for three including evening meal).
• Home-to-permanent-workplace travel: NOT exempt. Any reimbursement is fully taxable.

Childcare vouchers (closed scheme)

Closed to new entrants since 5 October 2018. Existing scheme members can continue receiving up to £55/week tax-free (basic rate), £28/week (higher), £25/week (additional rate).

Replaced by Tax-Free Childcare (a separate, non-employer scheme).

What's NOT on the P11D

• Pension contributions made via salary sacrifice (already pre-tax).
• Workplace pension contributions made by employer (these are pension scheme contributions, not BIK).
• Statutory payments (SSP, SMP, SPP, ShPP, SAP) - paid as taxable income via PAYE, not BIK.
• Bonus payments - taxable income, not BIK.
• Reimbursed business expenses (under the new "exemption for paid or reimbursed expenses" rules from 2016).

How to challenge a P11D

If your P11D shows an incorrect BIK:

1. Get the source data from your employer's payroll (the company car spec, the medical policy, the loan agreement).
2. Check against HMRC's P11D Working Sheet calculations for the relevant BIK class.
3. Request a correction in writing from your employer - they file a P11D correction with HMRC.
4. HMRC re-issues a corrected P2 to your employer's payroll, adjusting your tax code from the next available pay period.
5. Over-paid PAYE tax is auto-refunded through payroll (cumulative code) or via P800 reconciliation at year end.

Disclaimer

PayslipIQ provides automated educational guidance based on the figures you supply. It is not regulated tax advice. P11D rules interact with Marriage Allowance, the £100k Personal Allowance taper, salary sacrifice rules, and Class 1A NIC owed by your employer. For substantial BIK packages or contested HMRC valuations, contact HMRC on 0300 200 3300 or use a CTA-qualified tax adviser.