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Why GPS mileage apps miss miles, and why your odometer doesn’t
In short: a GPS mileage app can only count miles while your phone is awake, has a signal and has the app running. When any of those slip, miles quietly go missing. Your car’s odometer counts every mile no matter what your phone is doing, so writing it down at the start and end of each shift gives you a total you can check.
How phone tracking works
A GPS mileage app asks your phone for its location every so often and adds up the distance between those points. That depends on three things all working at once: the app has location permission, the phone lets it keep running in the background, and the phone can see enough satellites or cell towers to know where it is. Most of the time that works fine. The trouble is the times it doesn’t, because nothing warns you.
Five common ways miles go missing
- Battery saver and background limits. To save power, phones can pause or close apps running in the background, especially when the battery is low or the phone is hot. If the tracker gets paused, the miles driven in the meantime may never be recorded.
- Lost or weak signal. Rural roads, parking garages, tunnels and big apartment complexes can drop the location signal. Some apps fill the gap with a straight line, which is shorter than the road you actually drove.
- Short trips and slow starts. Apps that detect driving automatically may need a minute or two of movement before they start. That can clip the beginning of every trip, and very short hops between a restaurant and a nearby drop-off can be missed entirely.
- Tracking was never on. You forgot to start it, a phone update reset the location permission, or you logged out. The app can’t record a drive it didn’t know about.
- The phone died or restarted. A dead battery or a restart in the middle of a shift ends tracking until the app is opened again.
What a few missed miles add up to
Say your app misses 5 miles on a typical shift and you drive 200 shifts in a year. That’s 1,000 business miles. At the IRS rate of 76 cents a mile for July through December 2026 (IRS standard mileage rates), that’s a $760 deduction you didn’t claim. The numbers here are an example, but small gaps really do pile up over a year.
Why odometer readings make a stronger record
Here’s a sample shift. The odometer read 48,210 when the shift started and 48,257 when it ended, so the car drove 47 miles. If a GPS app showed 41.2 miles for the same shift, you know 5.8 miles went missing somewhere.
- The car counts every mile. It doesn’t care about battery saver, signal or permissions.
- It matches numbers other people write down. Oil change receipts, repair invoices, inspections and the paperwork when you buy or sell a car usually show the odometer too. A log whose readings only go up and line up with those papers is easy to check.
- The IRS’s own sample log uses it. The sample daily mileage log in Publication 463 (Table 5-2) has columns for odometer start and stop.
- It gives you total miles for the year. Pub. 463 says your records should show total miles for the year, and Schedule C Part IV asks for business, commuting and other miles (Schedule C instructions). A GPS app only knows what it tracked. The odometer knows everything.
An odometer log isn’t audit-proof, and nothing is. It just makes it much easier to show your numbers are real.
What odometer readings don’t do
You have to remember to note them, and a typo can throw off a shift. Readings also don’t say where you went, so add a short note like “DoorDash deliveries” or the area you worked. For delivery work, Pub. 463 says the nature of the work, such as making deliveries, is evidence of business use, and delivery records show when you used the car. Your gig app’s trip history backs up your log.
A simple routine that catches missed miles
- At the start of each shift, note or photograph the odometer. Do the same when you finish.
- Write down which app or apps you drove for, and any personal stops.
- Take a dated odometer photo on January 1 and December 31, or as close as you can.
- If you like your GPS app, keep it, and compare its weekly total to your odometer total. A big difference means something was dropped.
- Download your gig app’s trip and earnings history every so often as backup.
For everything a log should include, see what the IRS expects in a mileage log. We also compare the two side by side in IRS mileage log rules: odometer vs. GPS.
Frequently asked questions
Does the IRS require a GPS mileage app?
No. Publication 463 asks for an adequate record, like a log, diary or trip sheet, made at or near the time. A record kept on a computer or phone counts, and so does a paper log. No particular app or method is required.
Can I add the miles my GPS app missed later?
Adding miles from memory weeks later is an estimate, and the IRS says you can’t deduct amounts you approximate or estimate. Odometer readings you wrote down at the time are a record, not an estimate, so they can show miles a phone missed.
Is a photo of my odometer enough?
A dated photo is good backup, but it isn’t a full log by itself. Your log should still show the date, the business miles and what the driving was for.
What about personal stops during a shift?
Personal detours aren’t business miles, so note them and leave them out. Publication 463 says minimal personal use, like a stop for lunch between two business stops, doesn’t interrupt business use.
General information, not tax advice. Your situation may be different, so check with a tax professional before you file.
Sources
- IRS Publication 463: Travel, Gift, and Car Expenses (chapter 4: transportation and car expenses; chapter 5: recordkeeping)
- IRS: Standard mileage rates (all years, including both 2026 rates)
- IRS: Instructions for Schedule C (Form 1040), line 9 and Part IV
- IRS Topic no. 510: Business use of car
Related guides
Want this tracked for you?
Work Well Kept is built around the odometer, so missed GPS miles stop being a problem. Tap Start when your shift begins, type your odometer when you finish, and Work Well Kept keeps the date, miles and app for you. Miles between shifts are counted as personal unless you mark them Business, and the free reports add up business, personal and total miles for any week, month or year.
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General information, not tax advice. Tax rules depend on your situation and can change, so check with a tax professional before you file. Work Well Kept isn’t affiliated with the IRS or with DoorDash, Uber Eats, Amazon Flex or any other gig app. See our Disclaimer.