# Grey Fleet vs Company Cars (UK)

**Category:** [Grey Fleet Guides (UK)](https://community.mycartracks.com/c/grey-fleet-guides-uk/59)
**Created:** 2026-05-15 18:38 UTC
**Views:** 1
**Replies:** 0
**URL:** https://community.mycartracks.com/t/grey-fleet-vs-company-cars-uk/418

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## Post #1 by @MyCarTracks_support

The [grey fleet](https://community.mycartracks.com/t/what-is-a-grey-fleet-uk/415) vs company cars decision usually starts with cost, but it should not end there. A team with occasional site visits has a different problem from a high-mileage sales team, a care provider, or a business trying to standardise electric vehicles. The right answer depends on mileage, control, tax treatment, driver experience, and how much admin the organisation can manage well.

As a starting point, grey fleet often works for lower or irregular business mileage, while company cars can make more sense where the business needs tighter vehicle control, higher annual mileage, specific vehicle standards, or a managed electric-vehicle strategy. GOV.UK's [employee business travel mileage rules](https://www.gov.uk/expenses-and-benefits-business-travel-mileage/rules-for-tax) cover employees using their own vehicles, while GOV.UK's [company-car tax guidance](https://www.gov.uk/tax-company-benefits/tax-on-company-cars) covers private use of company cars.

This guide is for UK employers, business owners, finance teams, HR teams, operations managers, and fleet administrators weighing flexibility against control. It is educational only and is not tax, payroll, legal, HSE, employment, insurance, or financial advice.

![Grey fleet vs company cars mileage workflow for UK employers](upload://qIG2GZF94zTWanfRJ9vyJqQDa3y.svg)

## Quick answer

Grey fleet is usually the simpler fit when employees drive occasionally, business mileage is modest, and the business can manage licence, MOT, business-use insurance, mileage records, and reimbursement controls. Company cars are usually the stronger fit when the organisation needs consistent vehicle standards, higher-mileage control, brand presentation, operational availability, or an electric-vehicle programme.

For employee-owned grey fleet vehicles, HM Revenue and Customs (HMRC), the UK tax authority, uses Approved Mileage Allowance Payments (AMAPs) as the tax-free mileage payment benchmark. For company cars, private use can create Benefit-in-Kind (BiK) tax, and Advisory Fuel Rates (AFRs) apply only to company-car fuel reimbursement or private-fuel repayment.

## Grey fleet vs company cars: the two models

| Model | Who owns or provides the vehicle | Employer cost pattern | Main control issue | Main tax handoff |
| --- | --- | --- | --- | --- |
| Grey fleet | Employee, worker, or another third party | Variable mileage payments, possible car allowance, admin/check costs | Employer does not control the vehicle, so checks and records matter | AMAPs, Mileage Allowance Payments (MAPs), Mileage Allowance Relief (MAR), payroll treatment |
| Company car | Employer owns, leases, or provides the vehicle | Fixed lease/purchase, insurance, maintenance, fuel/admin costs | Employer controls the vehicle but carries more fixed cost and benefit reporting | BiK, Class 1A National Insurance, company-car fuel, AFRs |

Grey fleet is not "no fleet". It still needs the checks covered in [What Is a Grey Fleet? (UK)](https://community.mycartracks.com/t/what-is-a-grey-fleet-uk/415), [Grey Fleet Policy Guide (UK)](https://community.mycartracks.com/t/grey-fleet-policy-guide-uk/416), and [Grey Fleet Risk Assessment (UK)](https://community.mycartracks.com/t/grey-fleet-risk-assessment-uk/417).

## When grey fleet is the better fit

Grey fleet can work well when:

- employees drive occasionally or unpredictably
- annual business mileage is low or varies heavily by role
- staff are spread across locations where company cars would sit idle
- employees prefer using their own vehicle
- the business does not need identical vehicles, branding, equipment, or payload capacity
- reimbursement can be controlled with accurate mileage records
- driver, vehicle, MOT, tax, insurance, and journey checks are manageable

The main benefit is flexibility. You pay for recorded business use rather than committing to a fixed vehicle cost for every eligible employee.

The main risk is weak visibility. If employees estimate mileage, keep no trip purpose, or use vehicles without confirmed business-use insurance, the lower-cost model can become a payroll, insurance, HSE, and admin problem.

## When company cars are the better fit

Company cars can make more sense when:

- employees drive high annual business mileage
- the business needs specific vehicle standards, equipment, branding, or availability
- vehicles carry passengers, equipment, samples, tools, or sensitive materials
- the business wants central maintenance, insurance, replacement, and incident control
- drivers need consistent electric vehicles or charging arrangements
- grey-fleet reimbursements and admin time are rising together

The tradeoff is fixed cost. A company car costs money even when it is parked, but the employer gains more control over the vehicle, maintenance, insurance, replacement cycle, and fleet reporting.

## Grey fleet costs: AMAPs and car allowances

Approved Mileage Allowance Payments (AMAPs) are HMRC's tax-free mileage payment benchmark for employees using their own vehicle for business trips. Mileage Allowance Payments (MAPs) are payments an employer makes for that business travel. Mileage Allowance Relief (MAR) is tax relief an employee may claim if the employer pays less than HMRC's approved amount.

For 2026/27, GOV.UK lists employee-owned car and van approved rates as 45p per mile for the first 10,000 business miles in the tax year and 25p per mile after that. Motorcycles are 24p per mile and bicycles are 20p per mile. See [Current HMRC Mileage Rates (UK)](https://community.mycartracks.com/t/current-hmrc-mileage-rates-uk/361) for the full table and caveats.

These rates are tax benchmarks, not a universal rule that every employer must pay 45p per mile. Your contract, policy, sector rules, or employment arrangements may matter separately.

A car allowance is different. It is usually cash paid through payroll to help the employee fund a vehicle. It does not automatically prove the vehicle is suitable, insured for business use, or tax-free. If a car allowance is combined with mileage payments, finance and payroll need to review the payment structure carefully. See [Car Allowance for Employees (UK)](https://community.mycartracks.com/t/car-allowance-for-employees-uk/367).

## Company car costs: BiK and AFRs

Benefit-in-Kind (BiK) is tax on a non-cash employee benefit such as private use of a company car. GOV.UK says an employee pays tax if they or their family use a company car privately, including for commuting. The taxable value depends on factors such as list price, fuel type, CO2 emissions, availability, and employee contributions.

Electric and low-emission company cars can have lower BiK percentages than higher-emission vehicles, but the percentage changes by tax year and vehicle details. GOV.UK's [company-car appropriate percentage table](https://www.gov.uk/guidance/company-car-benefit-the-appropriate-percentage-480-appendix-2) is the official source to check before making an EV decision.

Advisory Fuel Rates (AFRs) are separate. GOV.UK says [advisory fuel rates only apply to employees using a company car](https://www.gov.uk/guidance/advisory-fuel-rates), for reimbursing company-car business travel or requiring employees to repay private fuel. Do not use AFRs for employee-owned grey-fleet vehicles.

## Illustrative employer cost comparison

This example is deliberately simple. It shows how the cost model changes; it is not a quote, benchmark, or recommendation.

Assume one employee drives 12,000 business miles in a tax year.

### Scenario 1: grey fleet, mileage payments only

| Component | Calculation | Illustrative annual employer cost |
| --- | ---: | ---: |
| First 10,000 miles at 45p | 10,000 x £0.45 | £4,500 |
| Next 2,000 miles at 25p | 2,000 x £0.25 | £500 |
| Vehicle lease, insurance, maintenance | Employee-owned vehicle | £0 direct employer vehicle cost |
| Total |  | £5,000 |

### Scenario 2: grey fleet, car allowance plus mileage payments

| Component | Calculation | Illustrative annual employer cost |
| --- | ---: | ---: |
| Car allowance | Example £400 x 12 | £4,800 |
| Mileage payments | Same 12,000-mile example | £5,000 |
| Total before employer payroll cost review |  | £9,800 |

This can be expensive for the employer because the fixed allowance and per-mile payments sit on top of each other. The actual tax and National Insurance result depends on the payment facts and payroll treatment.

### Scenario 3: company car

| Component | Calculation | Illustrative annual employer cost |
| --- | ---: | ---: |
| Lease or finance cost | Example £350 x 12 | £4,200 |
| Insurance, maintenance, tyres, breakdown | Example fixed allowance | £1,200 |
| Business fuel reimbursed using AFR-style assumption | 12,000 x £0.15 | £1,800 |
| Total before Class 1A National Insurance and admin review |  | £7,200 |

This example excludes employee BiK tax because that is the employee's tax cost, not the employer's direct vehicle operating cost. It also excludes employer Class 1A National Insurance on the car benefit, charging infrastructure, insurance differences, downtime, replacement vehicles, admin time, and any salary sacrifice or optional remuneration effects.

## Tax implications compared

| Issue | Grey fleet | Company car |
| --- | --- | --- |
| Business mileage payment | MAPs can be tax-free up to the approved amount if supported by business-mile records | Fuel-only reimbursement may use AFRs where the GOV.UK conditions are met |
| Private use | Employee's own vehicle is not a company-car benefit | Private availability can create BiK even if business mileage is high |
| Records | Trip-level records show business purpose, route or locations, miles, vehicle, driver, rate, and approval | Mileage records support business/private split, fuel repayment, and policy enforcement |
| Employer control | Lower vehicle control; more need for checks and declarations | More vehicle control; more reporting and benefit administration |
| Employee tax | MAR may be available if paid below the approved amount | Employee may pay company-car BiK and separate fuel benefit where private fuel is provided |

## Mileage inflation and admin cost

Grey fleet costs can drift when mileage records are weak. That does not always mean deliberate fraud. It can mean drivers:

- round distances because they did not record the trip at the time
- reconstruct routes weeks later from memory
- include small private detours by mistake
- submit claims in different formats
- forget to classify business and private travel clearly

Company cars have admin too: fuel reconciliation, private-use policy enforcement, vehicle ordering, maintenance, insurance, benefit reporting, and driver changes. Compare the whole process, not only the headline per-mile rate or monthly lease cost.

## Records both models need

For grey fleet, keep:

- driver and vehicle approval records
- business-use insurance confirmation
- MOT and vehicle tax checks where relevant
- trip date, purpose, route or locations, miles, vehicle, driver, and approval
- reimbursement rate, payment type, and payroll/export reference
- incident, defect, licence-change, insurance-change, or vehicle-change reports

For company cars, keep:

- vehicle assignment, availability, and private-use restrictions
- fuel type, CO2 emissions, list price, and appropriate percentage support
- employee contributions and availability changes
- business/private mileage records
- company-car fuel repayment or reimbursement records
- maintenance, insurance, and incident records

GOV.UK's [company-car guidance](https://www.gov.uk/tax-company-benefits/tax-on-company-cars) and [expenses and benefits recordkeeping guidance](https://www.gov.uk/employer-reporting-expenses-benefits/record-keeping) are the official starting points.

## How MyCarTracks helps compare the options

MyCarTracks cannot decide whether a company car or grey fleet is better for your organisation. It can give you cleaner mileage evidence before you make that decision.

[MyCarTracks automatic mileage tracking](https://www.mycartracks.com/products/automatic-mileage-tracking) can capture trips, let drivers classify business and private travel, and export reports by date, driver, vehicle, purpose, and distance. For teams, [MyCarTracks fleet tracking](https://www.mycartracks.com/products/vehicle-tracking) can help administrators review team activity, vehicle activity, mileage reports, and reimbursement records from one workflow.

That matters when you are comparing models. Actual trip records can show whether a role is really low-mileage, high-mileage, irregular, or drifting into a company-car use case.

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## Common mistakes

- Comparing 45p per mile with fuel-only AFRs as if they cover the same costs.
- Treating a car allowance as a grey-fleet control.
- Ignoring BiK when company cars are available for private use.
- Using AFRs for employee-owned vehicles.
- Assuming EV company cars are always cheapest without checking the tax year, list price, charging, insurance, and role mileage.
- Comparing vehicle cost but ignoring admin time, document checks, mileage approval, and recordkeeping.
- Letting mileage estimates drive the decision instead of measured business trips.

## FAQ

### Is grey fleet cheaper than company cars?

It can be cheaper for low or irregular business mileage because costs usually rise with recorded business use. Company cars can become more competitive when mileage is high, when vehicle control matters, or when an electric-vehicle strategy changes the tax and operating-cost picture.

### What is the difference between AMAPs and AFRs?

AMAPs are HMRC's approved mileage payment benchmark for employees using their own vehicles for business journeys. AFRs apply only to employees using company cars and are used for company-car business fuel reimbursement or private-fuel repayment.

### Can an employer offer both company cars and grey fleet?

Yes. Many employers run mixed fleets. The important point is to keep the tax, insurance, records, and approval rules separate for company cars, cash allowances, personal vehicles, and salary sacrifice cars.

### Does a car allowance replace mileage reimbursement?

Not automatically. A car allowance is usually cash pay through payroll. Whether mileage is also paid, whether MAR is relevant, and how tax and National Insurance apply depends on the policy, payment facts, and employment arrangement.

## Where to go next

- [What Is a Grey Fleet? (UK)](https://community.mycartracks.com/t/what-is-a-grey-fleet-uk/415)
- [Grey Fleet Policy Guide (UK)](https://community.mycartracks.com/t/grey-fleet-policy-guide-uk/416)
- [Grey Fleet Risk Assessment (UK)](https://community.mycartracks.com/t/grey-fleet-risk-assessment-uk/417)
- [Grey Fleet HMRC Compliance (UK)](https://community.mycartracks.com/t/grey-fleet-hmrc-compliance-uk/419)
- [Grey Fleet Mileage Tracking Software (UK)](https://community.mycartracks.com/t/grey-fleet-mileage-tracking-software-uk/420)
- [Current HMRC Mileage Rates (UK)](https://community.mycartracks.com/t/current-hmrc-mileage-rates-uk/361)
- [Mileage Allowance for Employees (UK)](https://community.mycartracks.com/t/mileage-allowance-for-employees-uk/363)
- [Mileage Allowance Relief (UK)](https://community.mycartracks.com/t/mileage-allowance-relief-uk/364)
- [Car Allowance for Employees (UK)](https://community.mycartracks.com/t/car-allowance-for-employees-uk/367)
- [Salary Sacrifice Car Scheme (UK)](https://community.mycartracks.com/t/salary-sacrifice-car-scheme-uk/368)

## Sources

- [GOV.UK: Expenses and benefits: business travel mileage for employees' own vehicles](https://www.gov.uk/expenses-and-benefits-business-travel-mileage/rules-for-tax)
- [GOV.UK: Travel - mileage and fuel rates and allowances](https://www.gov.uk/government/publications/rates-and-allowances-travel-mileage-and-fuel-allowances/travel-mileage-and-fuel-rates-and-allowances)
- [GOV.UK: Tax on company cars](https://www.gov.uk/tax-company-benefits/tax-on-company-cars)
- [GOV.UK: Calculate tax on employees' company cars](https://www.gov.uk/calculate-tax-on-company-cars)
- [GOV.UK: Work out the appropriate percentage for company car benefits](https://www.gov.uk/guidance/company-car-benefit-the-appropriate-percentage-480-appendix-2)
- [GOV.UK: Advisory fuel rates](https://www.gov.uk/guidance/advisory-fuel-rates)
- [GOV.UK: Expenses and benefits for company cars and fuel](https://www.gov.uk/expenses-and-benefits-company-cars/what-to-report-and-pay)
- [GOV.UK: Salary sacrifice for employers](https://www.gov.uk/guidance/salary-sacrifice-and-the-effects-on-paye)

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**Canonical:** https://community.mycartracks.com/t/grey-fleet-vs-company-cars-uk/418
**Original content:** https://community.mycartracks.com/t/grey-fleet-vs-company-cars-uk/418