What is the Mileage Expenses Calculator?
Mileage Expense Calculator for Landlords
Mileage Expense Calculator
When you travel to a rental property for viewings, inspections, maintenance or agent meetings, you can usually claim mileage using HMRC-approved rates. The August Mileage Expense Calculator turns two UK postcodes into a mapped route and an allowable mileage cost. It applies the correct pence-per-mile rate for your vehicle and tax-year threshold, and adding the passenger uplift where eligible. Reay to try August?
What this calculator does and why it’s different
Maps your route between two postcodes and shows the one-way distance.
Handles single or return trips and lets you set the number of trips (e.g., six site visits).
Applies HMRC rates automatically (e.g. cars/vans higher rate up to a threshold miles band, then lower rate separate rates for motorcycles and cycles).
Takes account of business miles already this tax year so the calculator switches from the higher to the lower band at the right point.
Adds +5p/mile passenger rate (cars only) when you carry fellow employees on the same business journey.
Results are illustrative and for UK journeys only. Always keep records and follow your accountant’s advice for your situation.
When mileage is usually allowable
Landlords/agents travelling for a business purpose: viewings, inspections, check-ins/outs, repairs, licensing appointments, bank or council visits.
Employees using their own vehicle for work travel, not ordinary commuting.
Self-employed who choose the simplified mileage method rather than full running-cost apportionment.
You should not claim mileage for ordinary home-to-work commuting or claim fuel receipts and mileage for the same journey, pick one method.
How to use this page
Enter Home postcode and Rental postcode (or tap Use my location).
Select Vehicle and Trip type (single or return).
Set Number of trips and enter Business miles already this tax year if you have any.
If applicable, choose Apply passenger rate? and set the number of passengers (car only).
Click Calculate mileage to see:
Route distance (one-way), Miles per trip, Total miles,
Allowable cost, and a rate breakdown across bands.
Click Save to August to attach the calculation (with map, postcodes, date, and notes) to the property.
Worked examples
Example 1 — Single return trip, car/van
Home: SW1A 1AA → Rental: M1 1AE
Trip type: Return, Number of trips: 1
Business miles this tax year: 0
The calculator maps the route, multiplies the one-way distance by two, and applies the higher car/van rate. Allowable cost and a banded rate breakdown appear in Results.
Example 2 — Multiple visits crossing the threshold
Six return trips this month; you already logged 9,700 business miles this tax year.
The calculator allocates the first 300 miles at the higher rate, then any remaining miles at the lower rate automatically. The breakdown shows how many miles fell into each band.
Example 3 — Passenger uplift (cars only)
Two colleagues ride with you on the same business journey.
Set Passengers = 2 and “Apply passenger rate = Yes”. The calculator adds +5p/mile per passenger to the allowable cost for the car method and shows this as a separate line in the breakdown.
Record-keeping that keeps HMRC and you happy
Good mileage claims are about evidence. You need to keep a record of:
Date and purpose of each journey (inspection, contractor visit, licence meeting).
Start and end postcodes and the mapped distance (screenshot saved with the entry).
Vehicle type and whether passenger uplift was applied.
Number of trips and any notes (e.g., “keys collected from agent”).
At quarter- or year-end you can export a clean mileage report per property or across your portfolio.
Disclaimer
The Mileage Calculator is provided by August for general information and research purposes only. While we use trusted open data sources, including official HMRC mileage rates and guidance, we cannot guarantee that all calculations are complete, up to date, or accurate for every individual circumstance.
The tool should not be relied on as a substitute for official HMRC guidance. Mileage results are approximate and may not reflect your exact entitlement or obligations.
August accepts no liability for decisions made based on information provided by this tool.
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