The mistakes that cost the most, ranked
Nine mistakes, ordered by cost. The first four are worth more than the other five combined.
1. Not tracking at all. The whole deduction, gone. For a full-time driver this is frequently the largest single line on the return, and no warning is produced by its absence.
2. Tracking only the paid portion. Repositioning, the drive to a zone, returns, backtracking. None of it appears in a platform figure, and for many drivers it is a substantial share of total driving. The unpaid miles are still deductible.
3. Using one rate for 2026. 72.5 cents January to June, 76 cents July to December. One annual total times one rate is wrong in one direction or the other. The 2026 rate.
4. No annual total. No odometer readings means business miles are an assertion rather than a proportion. Ten seconds, twice a year, and it cannot be done retroactively. One car for business and personal use.
5. Deducting what the rate already covers. Fuel, maintenance, insurance, depreciation are in the rate. Claiming them again is claiming the same cost twice. Parking and tolls are the exception, and are deductible in addition. Parking, tolls and what else you can deduct.
6. Losing the log with a phone. No export, no backup, one year gone.
7. Starting the app after leaving the driveway. Turns business driving into commuting for no reason.
8. Skipping the small expenses. Phone, bags, mounts, cashout fees.
9. Treating the deduction as a refund. It reduces taxable profit; it does not hand you the money back.
Why the first two dominate
Both are failures of capture, and capture is where all the value is. Everything below them is arithmetic or record-keeping, and arithmetic errors are recoverable while missing miles are not.
A missed trip is invisible. There is no notification, no gap in a report, nothing that looks wrong. By the time you would notice, the evidence has aged out. Why drivers underestimate their own mileage. · Why apps miss trips.
The costs, worked
Rough figures for a full-time driver, at the second-half 2026 rate:
| Mistake | Miles at stake | Deduction lost |
|---|---|---|
| No tracking at all | ~20,000 | ~$15,200 |
| Only paid miles | ~5,000 | ~$3,800 |
| Wrong rate on 12,000 miles | — | ~$400 either way |
| No annual total | — | Weakens the whole claim |
| Small expenses skipped | — | ~$500 to $1,500 of expense |
These are illustrations with a stated basis, not benchmarks. Run them on your own mileage; the point is the ordering, which holds regardless of the numbers.
And a deduction is not a refund. It reduces the profit that carries income tax and self-employment tax at 15.3 percent, so the cash effect is the deduction multiplied by your combined marginal rate. Still large, and not the headline figure. Why a deduction is not a refund.
The two free fixes
Photograph the odometer. Today, and on 31 December. Ten seconds each, and it is the number that makes everything else credible.
Go online before you pull out of the driveway. The app state when you start driving is usually what determines whether the drive is business or commuting, and it reflects when you actually started working. Costs nothing and recovers a trip every shift. The commuting rule. · The first and last trip of the day.
The one that is not about money
Losing the log. A year of records that lived in one app on one phone, with no export, is gone with the phone, and it is the version that feels worst because the work was done.
One export a year, to a file you keep. What records to keep and for how long. · If a platform deactivates you.
The order to fix them in
- Start capturing everything, today. How to start a mileage log today.
- Photograph the odometer.
- Check you are splitting 2026 at 30 June. The calculator.
- Export what you already have.
- Start a receipts folder for the small expenses.
All five together are under an hour, and four of them are permanent. The end-of-year checklist. · The four numbers every gig driver should know.
More in this section
About MileTruth
MileTruth is an iOS app from Baker Ventures LLC that tracks deductible business mileage for gig and delivery drivers and shows true net pay: what is left after mileage, fuel and self-employment tax, not what the platform showed you at acceptance. It is built for people driving several platforms in the same shift, and for anyone who needs a mileage log that would hold up if the IRS asked for it. The app is in development.
Everything on this site is free and needs no account: the mileage deduction calculator, the per-platform pay breakdowns, and the answers, each one linked to the IRS publication or platform document it came from. MileTruth publishes the source for every number, including the 2026 split-year standard mileage rate, because a deduction you cannot substantiate is not a deduction.
Questions and answers
What is the most expensive mileage mistake?
Not tracking at all, followed by tracking only the paid portion of trips. Both leave a large share of a legitimate deduction unclaimed, and neither produces any warning that it is happening.
Does using the platform's mileage figure count as tracking?
It is a floor rather than a record. Platform figures generally reflect on-trip distance, so they omit repositioning, drives to a zone and returns, which for many drivers is a substantial share of the total.
What is the 2026 split-rate mistake?
Applying one rate to the whole year. 2026 uses 72.5 cents for January through June and 76 cents for July through December, so a single annual total multiplied by one rate is wrong in one direction or the other.
Is not photographing the odometer really a mistake?
It costs nothing to do and it is the number that makes business miles a proportion rather than an assertion. It also cannot be done retroactively, which is what makes it worth ten seconds twice a year.
What about deducting things the standard rate already covers?
Fuel, maintenance, insurance and depreciation are included in the standard mileage rate, so deducting them separately is claiming the same cost twice. Parking and tolls are the exception and are deductible in addition.
Which mistake is easiest to fix?
The odometer photograph, which takes ten seconds, and going online before you leave the driveway, which takes none. Both are habits rather than work.
MileTruth. “The mistakes that cost the most, ranked.” Baker Ventures LLC, September 7, 2026. https://miletruth.bakerventuresstudio.com/why/the-mileage-mistakes-that-cost-the-most/