How to Keep a Trip Sheet (and Why the IRS Cares)

If the IRS audits your mileage deductions or a state audits your IFTA return, a trip sheet is how you prove your numbers. Without one, your deductions are estimates — and estimates don't hold up when someone asks to see the records.

A trip sheet is a daily log of where you went, how far you drove, which states you crossed, and what the business purpose was. Owner-operators and small fleets use them to:

• Substantiate mileage deductions on Schedule C
• Back up state-by-state mileage for IFTA quarterly returns
• Support weight-distance tax filings for states like Kentucky, Oregon, and New Mexico
• Defend load and delivery records if a dispute arises with a broker or shipper

This is not a complicated document. But it needs to be complete, and it needs to be consistent.

What the IRS Requires for Business Mileage

The IRS has specific substantiation rules for business vehicle expenses under Publication 463. To deduct vehicle expenses or mileage, you need a contemporaneous record — meaning you write it down at the time, not from memory months later.

The four things the IRS requires you to document for each trip:

1. Date of the trip
2. Business purpose — the load, customer, or job being driven for
3. Destination — where you went
4. Mileage — total business miles driven on that day or trip

"Contemporaneous" is the key word. A trip sheet filled out at the end of the day is fine. One reconstructed from memory in February before filing taxes is not — and if the IRS questions it, you'll have a hard time defending numbers you couldn't recall precisely.

Owner-operators who run ELDs have GPS logs that capture date, location, and mileage automatically. Those logs help satisfy the substantiation requirement, but GPS data alone doesn't capture business purpose. You still need to note what the trip was for — the load number or customer name is enough.

What IFTA Requires from Trip Records

IFTA auditors look for records that reconcile your quarterly return figures back to actual operations. The IFTA audit standards (maintained by IFTA, Inc.) specify what qualifying trip records must include:

• Date of trip
• Trip origin and destination
• Routes traveled
• Beginning and ending odometer or hub odometer readings
• Total trip miles
• Miles by state or province
• Unit number or VIN
• Driver name

If you're audited, the auditor matches your IFTA return numbers against these records. If records are missing, incomplete, or internally inconsistent, the auditor reconstructs your liability — typically using the most unfavorable mileage assumptions. That math does not go in your favor.

A paper trip sheet or an ELD report that captures state-by-state mileage satisfies IFTA's record requirements. Both work. The point is that something has to document the trip at the time it happened.

The Basic Trip Sheet Format

You don't need a special form. Any consistent format that captures the required fields works. A basic record for one trip covers:

For multi-state loads, add a row per state:

If you buy fuel, record the state, gallons, and purchase price on the trip sheet as well. That ties your fuel purchases directly to your mileage data — useful for both IFTA calculations and fuel expense records.

Paper vs. Digital

Paper works fine if you're consistent. Truck stop log books give you a formatted sheet for each day. The downside is that paper gets lost, coffee-stained, or left in the truck. Losing a month of trip sheets means losing a month of deduction support.

Digital is more durable. Options:

• ELD logs — if you run an FMCSA-registered ELD (Motive, Samsara, etc.), your HOS logs function as trip records. They capture dates, locations, state crossings, and mileage automatically and are stored on a server, not in your cab. You still need to note the business purpose separately for IRS purposes.
• Spreadsheet — a Google Sheet or Excel file you update daily works. Syncs to the cloud and survives a lost phone or a truck change.
• Dispatch and load management software — load management software that records each load's origin, destination, mileage, and state breakdown covers most of the IFTA trip record requirement as a byproduct of entering loads. The trip sheet becomes something that happens automatically when you enter your work, not a separate chore.

State mileage tracking that captures miles by state as you log loads means your IFTA records are maintained continuously — not assembled from scratch at quarter end.

How Long to Keep Trip Records

The practical answer: keep everything for five years. Digital storage costs nothing meaningful. A gap in records when an auditor asks for them costs far more.

Making It a Habit

The reason most owner-operators fall behind on trip sheets is that it feels like a separate administrative task on top of an already full day. The fix is to attach it to something you're already doing.

Build it into load closeout. At the end of each delivery:

1. Record the ending odometer
2. Pull state miles from your ELD or note them if tracking manually
3. Log any fuel purchased
4. Write in the load number or customer name as the business purpose

That's two to five minutes. Done daily, it's painless. Done weekly from memory, it's error-prone. Done at tax time from scratch, the records are too thin to survive scrutiny.

Expense tracking that lets you attach fuel receipts and mileage notes to individual loads keeps trip records and expense records together rather than in separate files you have to reconcile later.

Truck Command logs state mileage and expenses per load so your trip records are built as you work, not reconstructed at filing time. Plans start at $20/month with a 14-day free trial — no credit card required.