Business Miles vs. Commuting Miles vs. Personal Miles: What Actually Counts?

Vehicle deductions are one of the most frequently audited areas on a small business return, and the IRS has seen every version of this mistake. The core issue is straightforward: business miles are deductible, commuting miles are not, and personal miles are not - but the line between them is where most business owners go wrong. Getting this wrong does not just cost you a deduction; it can disqualify your vehicle from accelerated depreciation entirely and trigger recapture in a later year. This article walks through exactly what counts, what does not, and how to document it so it holds up if the IRS asks.

Why this matters more than you might think

Vehicles are what the tax code calls listed property under §280F. That classification exists because Congress and the IRS have always viewed vehicle deductions as easy to abuse and hard to verify. The rules that apply to listed property are stricter than those for most other business assets.

The threshold you need to clear is the greater-than-50% business use test. If your vehicle is used more than 50% for business, you can depreciate it under MACRS (the standard accelerated method) and potentially take a §179 expensing deduction in the year of purchase. If business use is 50% or below, you lose both of those options and are forced onto straight-line depreciation under the Alternative Depreciation System (ADS) - a much slower recovery period.

It gets worse if the percentage drops below 50% in a year after you already claimed accelerated depreciation. That triggers depreciation recapture, meaning you owe tax on the excess depreciation you already took. The IRS knows vehicle deductions are commonly overstated. This is a high-audit-risk area, and documentation is what separates a defensible return from an expensive one.

What counts as a business mile

A business mile is a mile driven for an ordinary and necessary business purpose - meaning the trip exists because of your business, not because of where you live or where you chose to locate your office.

Clear examples of business miles:

Driving from your office to meet a client at their location
Driving between two job sites during the workday
Driving to a supply house to pick up materials for a job
Driving to make a delivery to a customer
Driving to a bank, attorney, or accountant for a business-related appointment

The common thread: the trip has a clear business destination and a business reason that exists independent of your commute. If you drive from your shop to a client's warehouse and back to the shop, both legs count.

What commuting is - and why it never counts

Commuting is travel between your home and your regular place of business. It does not matter how far you drive, what vehicle you use, or what you do during the trip. Commuting miles are personal miles, period.

This catches a lot of business owners off guard because the vehicle is registered to the business, or they take calls during the drive, or the truck has tools in the back. None of that changes the analysis.

Examples of commuting - not business miles:

Driving from your home to your shop every morning
Driving from your home to your office building
Driving from your home to the yard where your work vehicle is parked, then driving the work vehicle to the job site (the home-to-yard leg is commuting)
Taking a business call on your cell phone during the drive to the office
Driving a company-branded vehicle to and from work

The IRS does not care that the trip feels like work. If you are traveling between home and your regular workplace, it is commuting.

The home office exception - when trips from home can be deductible

There is one meaningful exception: if your home qualifies as your principal place of business under §280A, then trips from your home to other business locations may be deductible as business miles - because your home is the business location you are departing from, not a personal residence you are commuting out of.

To qualify, the home office must be used regularly and exclusively for business, and it must be your principal place of business - meaning it is where you conduct the administrative or management activities of your business, and you have no other fixed location where you perform those functions.

If that standard is met, a drive from your home office to a client site is a business mile, not a commute. But this is fact-specific, the IRS scrutinizes home office claims closely, and the documentation requirements apply here too. If you are relying on this exception, make sure your home office claim is solid before you start counting those miles as deductible.

Gray area situations - with clear answers

These come up constantly. Here is a direct answer for each one:

Driving from home to a temporary work location: Deductible business miles, as long as the location is temporary (not a regular workplace). The IRS generally treats a location as temporary if you expect to work there for less than one year.
Dropping off work equipment at a shop and then driving home: The trip has a business purpose - document the destination and the reason.
Driving from a business stop back home at the end of the day: It depends. If your last stop was a client visit or business errand and home is not your regular workplace, the return trip may be deductible. If you are simply driving home from your regular place of business - even after a long day - that leg is commuting. This is sometimes called the "last stop rule" and it trips people up.
Driving your personal vehicle to pick up your work vehicle at a shop: The trip exists for a business reason - miles are deductible.
Commuting in a vehicle that has tools or equipment in it: No. Cargo does not convert a commute into a business trip. The IRS addressed this directly - the nature of the trip is determined by its purpose, not its contents.

How the greater-than-50% business use test actually works

For §280F purposes, your vehicle's business use percentage is calculated as business miles divided by total miles driven during the year. Commuting miles count as personal miles in this calculation - not business miles.

If your business use percentage comes in above 50%, you can use MACRS depreciation and §179. If it comes in at 50% or below, you must use straight-line depreciation under ADS, which has a longer recovery period and produces smaller annual deductions.

The recapture rule is the part most people do not think about at purchase: if you claimed MACRS or §179 in an earlier year and your business use percentage drops to 50% or below in a later year, you must recapture the excess depreciation as ordinary income in that later year. This can create a meaningful tax bill in a year where you thought you were done with that vehicle's depreciation story.

This is why it matters to track mileage accurately every year - not just in the year you buy the vehicle.

How to document vehicle use so it holds up

The IRS requires contemporaneous records for vehicle deductions. That means records created at or near the time of each trip - not reconstructed from memory at tax time.

A compliant mileage log includes, for each trip:

Date of the trip
Destination (specific location, not just "client")
Business purpose (what was the trip for)
Miles driven
Odometer readings at the start and end of the year (or the start and end of business use)

A mileage log reconstructed at the end of the year - or pulled together when an audit notice arrives - is treated as weak evidence and is frequently rejected. The IRS has seen reconstructed logs. Auditors know what they look like.

Using apps to track mileage - what works and what does not

Several apps automate mileage tracking via GPS and allow you to categorize trips in real time. That is a reasonable solution as long as the records are actually complete and the categorization is accurate. The tool does not matter; the completeness does. An app full of uncategorized or mislabeled trips is not a compliant log - it is just a different format for the same problem.

Key takeaways

Track every trip, every time. Mileage logs created after the fact do not hold up.
Commuting is never a business mile - regardless of vehicle, cargo, or what you do during the drive.
Falling below 50% business use costs you accelerated depreciation and can trigger recapture on deductions you already took.
If you work from a home office and are counting trips from home as business miles, make sure your home office qualification is solid - that exception does not apply automatically.
If your vehicle situation is complicated - multiple vehicles, mixed personal and business use, a home office, or a year where usage patterns changed significantly - talk to your CPA before you file, not after.