Mileage Tracking for Business: What the IRS Actually Requires

If you drive for work, mileage is one of the most valuable tax deductions available to you. For self-employed individuals and small business owners, it can easily add up to thousands of dollars per year. But the IRS has specific rules about what counts as business mileage, how to calculate it, and what records you need to keep. Get it wrong and you could lose the deduction entirely in an audit.

This guide breaks down the two deduction methods, what qualifies as business driving, exactly what the IRS expects in a mileage log, and how to make the whole process painless.

Standard mileage rate vs. actual expense method

The IRS gives you two ways to deduct vehicle expenses for business use. You must choose one for each vehicle, and the choice matters more than most people realize.

Standard mileage rate: For 2025, the IRS standard mileage rate is 70 cents per mile for business driving. You simply multiply your total business miles by this rate. If you drove 12,000 business miles, your deduction would be $8,400. This rate is meant to cover gas, insurance, maintenance, depreciation, and wear and tear — all rolled into one number. It is simple to calculate, and the only records you need are your mileage logs.

Actual expense method: With this approach, you track every vehicle-related expense — gas, oil changes, tires, insurance premiums, registration fees, lease payments or depreciation, repairs, parking, and tolls. At the end of the year, you multiply the total by your business-use percentage. If you spent $10,000 on your car and used it 60% for business, your deduction is $6,000.

Which method is better? It depends on your situation. The standard mileage rate tends to work well for people who drive a lot of business miles in a fuel-efficient or older vehicle. The actual expense method can produce a larger deduction if you have a newer, more expensive vehicle or if your actual costs are high. The only way to know for sure is to run the numbers both ways.

One important rule: if you want to use the standard mileage rate, you must choose it in the first year you use the vehicle for business. You can switch to actual expenses in later years, but not the other way around. If you start with actual expenses, you are locked in for that vehicle.

What qualifies as business mileage

This is where many people make costly mistakes. Not every drive that feels work-related actually qualifies.

Qualifies as business mileage:

• Driving from one work location to another (e.g., between client sites or job sites)
• Trips to the bank, post office, or supply store for business purposes
• Travel to meetings, conferences, and networking events
• Driving to a temporary work location (different from your regular office)
• If your home is your principal place of business, drives from home to any business destination count

Does NOT qualify:

• Commuting. The drive from your home to your regular, fixed place of work is personal mileage — no exceptions. This is the single biggest mistake taxpayers make with mileage deductions.
• Personal errands, even if you combine them with a business trip
• Driving to lunch (unless it is a business meal with a client or prospect)

There is a useful exception for home-office workers. If you have a dedicated home office that qualifies as your principal place of business, then every trip from your home to a business destination is deductible — because your "commute" is the walk to your desk.

What the IRS requires in a mileage log

The IRS does not prescribe a specific format, but they do require specific information for each business trip. Your mileage log must include:

• Date of the trip
• Destination (where you drove to)
• Business purpose (why the trip was necessary — e.g., "client meeting," "supply pickup," "site visit")
• Miles driven for the trip
• Odometer readings at the start and end of the year (to establish total miles driven)

A simple notebook, spreadsheet, or app can work. The key is contemporaneous recording — meaning you log the trip at or near the time it happens, not months later from memory. The IRS is skeptical of mileage logs reconstructed after the fact, and courts have repeatedly thrown out deductions based on estimated or reconstructed records.

Common mileage tracking mistakes

Even people who track mileage diligently can run into problems. Here are the mistakes that most frequently trigger issues:

• Claiming commuting miles: As noted above, your regular commute is never deductible. Mixing commuting miles into your business total is a red flag in an audit.
• Rounding or estimating: Writing down "about 30 miles" instead of actual figures weakens your records. The IRS wants specifics.
• Forgetting to log short trips: A quick run to the office supply store or the bank still counts. These small trips add up over a year, but only if you record them.
• Not tracking personal vs. business split: If you use the actual expense method, you need to know your business-use percentage. That requires tracking total miles and business miles separately.
• Waiting to log until year-end: Reconstructing a year of mileage from memory is almost impossible to do accurately, and the IRS knows it.

How to build a tracking habit that sticks

The reason most people fail at mileage tracking is not laziness — it is friction. If the process takes more than a few seconds, it falls apart within weeks. The best approach is one that fits into what you already do.

Some people keep a small notebook in their car and jot down the date, destination, and miles after every business trip. Others use their phone's notes app or a voice memo. The method matters less than consistency. Whatever you choose, the goal is to make logging a trip feel as automatic as putting on your seatbelt.

If you are also tracking receipts for expenses like gas, tolls, and parking, keeping mileage and receipts in the same system saves time and reduces the chance of gaps. Tools like SendToBooks let you log mileage entries alongside your receipts, so everything lives in one place and is ready to export when you need it.

When to use which method: a quick decision guide

If you are not sure which deduction method to choose, here is a simplified way to think about it:

• Choose the standard mileage rate if you drive a lot of business miles, your vehicle is relatively inexpensive to operate, or you want the simplest possible record-keeping.
• Choose actual expenses if you have a newer or luxury vehicle with high costs, you drive relatively few business miles but have significant vehicle expenses, or you want to depreciate the vehicle.
• Not sure? Track everything. Keep a mileage log and save all vehicle expense receipts for the year. At tax time, calculate both ways and pick the one that gives you the larger deduction. You cannot do this comparison if you only tracked one set of records.

Whichever method you choose, the mileage log requirements are the same. You need date, destination, purpose, and miles for every business trip. That does not change.