Most business owners think mileage is simple.
Drive → log miles → claim.
But I notice something different in practice. People either under-claim and leave money on the table, or overcomplicate it and risk getting it wrong with HM Revenue & Customs.
The reality is this: HMRC mileage rates are one of the cleanest, most efficient tax tools available to a limited company. If you understand them properly, they reduce tax with almost zero friction. If you don’t, you either lose money or create unnecessary risk.
What Are HMRC Mileage Rates?
HMRC mileage rates are fixed, approved rates that determine how much you can claim (or be reimbursed) for using a vehicle for business travel.
They are designed to cover the true cost of running a vehicle, not just fuel. That includes:
- fuel
- maintenance
- insurance
- wear and tear (depreciation)
Instead of tracking every individual cost, HMRC gives you a simplified per-mile rate. That is what makes this system powerful. It replaces complexity with a standardised, accepted number.
The Core Mileage Rates for 2026
For the 2026 tax year, the standard mileage rates remain unchanged:
- 45p per mile for the first 10,000 business miles
- 25p per mile for any miles above 10,000
Motorcycles are 24p per mile, and bicycles are 20p per mile.
At first glance, these numbers seem basic. But the structure matters.
The first 10,000 miles are heavily incentivised. After that, the rate drops because the fixed costs of running the vehicle have already been largely covered.
This is not arbitrary. It reflects how real-world vehicle costs behave.
The Part Most People Miss: Company Cars vs Personal Cars
This is where confusion starts.
There are actually two different systems:
- Mileage rates (45p / 25p) → for personally owned vehicles
- Advisory fuel rates → for company cars
Most people mix them up.
If you use your own car for business, you use the 45p/25p system.
If the company owns the car, you use Advisory Fuel Rates (AFRs) instead. These are much lower because they only cover fuel, not the full cost of ownership.
For 2026, advisory fuel rates are roughly:
- Petrol: 12p to 22p per mile depending on engine size
- Diesel: 12p to 18p per mile
- Electric: 7p (home charging) or 15p (public charging)
This distinction is critical.
Use the wrong system, and you either:
- underclaim significantly
- or create a tax issue
I notice this is one of the most common errors in small companies.
Why This Matters Financially
Let’s make this practical.
If you drive 10,000 business miles in your personal car:
- 10,000 × 45p = £4,500 tax-free reimbursement
That is not profit. That is money extracted from the company without income tax or National Insurance when structured correctly.
Now compare that to someone who does not track mileage properly. They lose that entire amount.
This is why I consider mileage one of the cleanest optimisations available. It is simple, legitimate, and highly effective.
Where People Go Wrong
The mistakes are predictable.
First, poor tracking. People rely on memory instead of recording journeys. That is unreliable and not defensible if questioned.
Second, mixing personal and company car rules. Claiming 45p on a company car is incorrect. Using AFRs on a personal car leaves money behind.
Third, inconsistency. Mileage is recorded sporadically, which creates gaps and weakens the claim.
These are not technical failures. They are discipline failures.
Advisory Fuel Rates: What They Actually Do
Advisory fuel rates exist to simplify reimbursement for company cars.
If an employer reimburses at or below these rates, there is:
- no additional tax
- no National Insurance liability
That is the key advantage.
They create a safe zone where reimbursements can happen cleanly without triggering extra tax consequences.
But they are reviewed quarterly, not annually. That means rates can shift based on fuel and electricity costs.
For example, in 2026:
- petrol and diesel rates largely remained stable
- LPG rates decreased slightly
- public EV charging increased to 15p per mile
This reflects real-world cost movements.
The Strategic Angle Most Directors Miss
Mileage is not just an admin task. It is a cash extraction strategy.
Used properly, it allows directors to:
- move money out of the company tax-efficiently
- reduce corporation tax
- avoid salary or dividend tax on that portion
But it only works if it is done correctly and consistently.
I notice that high-performing operators treat mileage like a system, not an afterthought.
They:
- log every journey in real time
- separate personal and business use clearly
- understand which rate applies to which vehicle
This is not complicated. But it is deliberate.
The Bottom Line
HMRC mileage rates are one of the simplest and most effective tax tools available to limited companies.
They turn everyday activity, driving, into a structured, tax-efficient extraction method.
But like most simple systems, they only work if you apply them properly.
If you are not tracking mileage, you are losing money.
If you are using the wrong rates, you are either underclaiming or creating risk.
And if you are inconsistent, you are weakening the entire position.
The opportunity here is not hidden. It is just ignored.
And in business, the things that are ignored tend to be where the easiest wins are.
