Already Logging Drives in a Car-Data App? Turning Tagged Drives into a Tax Mileage Log
General information, not tax or legal advice. Talk to your tax preparer about your situation.
A car-data app's drive history gives you dates, places and miles, which is a strong start. A tax mileage log also needs the business purpose of each trip and total miles for the year (IRS Pub 463). Export your drives, add each business trip's purpose, check totals against the odometer, and label weekly.
Plenty of EV owners already run a car-data app, such as TeslaFi, Tessie or TeslaMate, for charging stats, efficiency graphs and drive maps. If you also use the car for work, that history looks like a mileage log. It's close, but not quite. This guide covers what a drive history already gives you, what the IRS still expects, and a routine for closing the gap. CyberDeduct isn't affiliated with any of these apps, and the features of each one change over time, so check your own app's export options.
What a drive history usually has
A typical drive record from a car-data app has a start time, an end time, start and end places, and distance. Some apps also store odometer values at the start and end of each drive. In the terms of IRS Publication 463, that covers the date, the destination and the miles of each trip, which are three of the main details.
What the IRS still needs from you
Pub 463 says that for car expenses you need the mileage for each business use and the total miles for the year, plus the time, place and business purpose of each use. Two of those don't come from GPS data:
- Business purpose. An app knows you drove to an address, not why. "Client site visit" or "picked up supplies" has to come from you.
- A business or personal label. Many apps let you tag or categorize drives. A tag such as "business" helps, but it isn't a purpose by itself.
The year also needs a clean total: every mile the car drove, business and personal.
A routine that turns drives into a log
- Export the drives for the period, usually as CSV, with date, start and end places, distance and, if available, odometer values.
- Label each drive as business, commuting or personal. Commuting between home and your regular place of work is personal (Pub 463). See commuting vs business miles.
- Add a purpose to each business drive in a column of its own.
- Check the totals. Compare total exported miles with the odometer change for the period. A big gap usually means missing drives.
- Do it weekly. Pub 463 says a log kept on a weekly basis that accounts for use during the week is considered timely kept. Adding purposes from memory in March is harder to support.
Example: an export shows 1,240 hypothetical miles in October 2026, of which 860 are labeled business with a purpose. At the standard rate, 860 × 76¢ = $653.60, and the month's business-use share is about 69%. Estimates, not tax advice.
Watch for gaps in the data
A drive history is only as complete as the logging behind it. The TeslaMate FAQ says the Tesla API doesn't provide historical drives or charges, so TeslaMate can't recover data missed while logging was stopped. It mentions a TeslaFi import for filling a gap if another logger recorded that period. Other apps may differ, so check yours. If a stretch is missing, note it and fill it from other records, such as calendar entries or receipts. See how to rebuild a missing mileage log.
Odometer as the cross-check
Write down the odometer reading on January 1 and December 31, or save a screenshot. The difference is total miles for the year, which Form 4562 Part V asks for. If the app's drive total falls short, the odometer tells you by how much. See Form 4562 Part V vehicle records.
Columns to end up with
Whatever app you start from, aim for a sheet with: date, destination, business purpose, start and stop odometer (or trip miles), miles, and a business, commuting or personal label. Those match the sample log in Pub 463, Table 5-2. See what the IRS requires in a mileage log.
Then apply the rate: 72.5¢ per mile for January 1 to June 30, 2026 (IR-2025-128 / Notice 2026-10) and 76¢ per mile for July 1 to December 31, 2026 (IR-2026-29 / Announcement 2026-11), per the IRS standard mileage rates page. Or use the business-use percentage under actual expenses.
A log built for taxes from the start
A car-data app is built for owners who like data. A tax log adds purposes, totals and an export your preparer can read.
CyberDeduct builds a mileage log around IRS Pub 463 from your Tesla's own trip and odometer data. You connect your Tesla account once through Tesla's standard account sign-in (OAuth); CyberDeduct never sees or stores your password. You confirm each trip's purpose and export a PDF or CSV log plus a Form 4562 Part V worksheet for your tax preparer. See how the log is built or see plans.
Frequently asked questions
Is my car-data app's drive history enough as a mileage log?
Usually not by itself. It gives dates, places and miles, but the IRS also asks for the business purpose of each trip and total miles for the year (Pub 463).
Can I add business purposes to old drives later?
You can, but Pub 463 treats a log kept weekly as timely. Purposes added long after the fact are harder to support, so label drives each week.
What if my app missed some drives?
Note the gap and fill it from other records. The TeslaMate FAQ says data missed while logging was stopped can't be recovered from the Tesla API.
Do I need odometer readings if the app records distance?
Readings at the start and end of the year give you total miles and a check on the app's totals. Form 4562 Part V asks for total miles.
Is CyberDeduct connected to TeslaFi, Tessie or TeslaMate?
No. CyberDeduct isn't affiliated with these apps. This guide describes general steps for any export of drives.
This article is general information, not tax or legal advice. Talk to your tax preparer about your situation.
CyberDeduct is an independent product of LIKE LLC and is not affiliated with or endorsed by Tesla, Inc. Tesla is a trademark of Tesla, Inc.
CyberDeduct is not affiliated with or endorsed by TeslaFi, Tessie or TeslaMate. TeslaFi, Tessie and TeslaMate are names of their respective owners and are used here only to describe those apps.