IRS Mileage Log Requirements: What a Compliant Log Looks Like (Free Template)

Short answer: The IRS mileage log requirements are short but strict: for every business trip you record the date, the destination, the business purpose, and the miles driven, plus your total annual mileage from odometer readings taken at the start and end of the year. The log must be contemporaneous — written at or near the time of the trip. Estimates and year-end reconstructions do not satisfy it. Keep the log for at least three years after filing.

If you deduct business miles, your mileage log is the evidence that supports the deduction. A weak or missing log is one of the most common reasons vehicle deductions get reduced or denied in an audit. This article explains exactly what a compliant IRS mileage log contains, shows a free template, and lists the mistakes to avoid. If you are still deciding how to capture trips day to day, our guide to how to track mileage for taxes covers the methods; this page is about what the finished record has to prove.

What are the IRS mileage log requirements?

The IRS requires a mileage log that is contemporaneous and complete. Contemporaneous means you record each trip at or near the time it occurs, and complete means each entry contains enough detail to establish the business nature and distance of the trip.

At minimum, a compliant mileage log must record the following for each business trip:

• Date of the trip.
• Starting location and destination (or a clear description of where you went).
• Business purpose of the trip (for example, “client meeting” or “supply pickup”).
• Miles driven for that trip.

In addition, your records for the year must establish:

• Your total annual mileage (business plus personal), typically from odometer readings at the start and end of the year.
• The business-use percentage of the vehicle, which follows from your business miles versus total miles.

These fields apply whether you use the standard mileage method or the actual expense method, because both rely on knowing your business miles.

Why does the log have to be “contemporaneous”?

The IRS emphasizes contemporaneous records because they are more reliable than memory. A log kept throughout the year is treated as strong evidence, while a log created from scratch at tax time is viewed with suspicion.

You do not have to write down every trip the instant you park, but you should update your log regularly — daily or weekly — so entries are made while the details are fresh. Supporting documents such as calendar appointments, client invoices, and job records can reinforce your log, but they do not replace the log itself. The IRS sets out the substantiation standard for travel and vehicle expenses in Publication 463, which is the document an examiner will be working from.

Free IRS mileage log template

You can keep a compliant log on paper, in a spreadsheet, or in an app. The template below shows the columns your log should include. Copy it into a spreadsheet or notebook to get started.

Date	Start location	Destination	Business purpose	Odometer start	Odometer end	Business miles
03/04/2026	Home office	120 Main St, client site	Client consultation	40,000	40,018	18
03/06/2026	Home office	Supply warehouse	Pick up materials	40,060	40,082	22
03/09/2026	Office	Downtown	Business bank deposit	40,110	40,124	14

At the start of the year, record your beginning odometer reading. At year-end, record your ending reading and total your business miles. Keep the completed log with your tax records for at least three years after filing — how long to keep tax records covers the cases that stretch that window to six years or longer.

What does a compliant log NOT need to include?

A compliant log does not need to include every personal trip in detail, and under the standard mileage method it does not need gas or repair receipts. Knowing what you can leave out keeps recordkeeping manageable.

Your mileage log generally does not need to include:

• The purpose of personal trips (only your total personal miles matter).
• Fuel and maintenance receipts, if you use the standard mileage method.
• The exact route taken, as long as the mileage figure is accurate.
• GPS coordinates or continuous location tracking.

If you use the actual expense method, you do need to keep receipts for vehicle costs in addition to the mileage log, because the log only establishes the business-use percentage you then apply to those costs. Our comparison of standard mileage versus actual expenses explains which method leaves you with less paperwork.

What are the most common mileage log mistakes?

The most common mileage log mistakes are failing to keep the log at all, recording estimates instead of actual trips, and leaving out the business purpose. Any of these can cause the IRS to reduce or disallow your deduction.

Avoid these frequent errors:

• Reconstructing from memory at tax time instead of logging trips contemporaneously.
• Round-number estimates like “about 12,000 business miles” with no trip detail.
• Missing business purpose entries, which make trips hard to defend.
• Mixing personal and business miles without separating them.
• Logging the commute from home to a regular workplace, which is personal mileage rather than business mileage — our guide to whether the commute is tax deductible works through the narrow exceptions.
• Gaps in the log where weeks or months are missing.
• No odometer readings to establish total annual mileage.

A tool that stamps each trip with the correct year’s IRS rate and stores entries in an unchangeable record makes these mistakes much harder to make.

How does an audit-stable log protect you?

An audit-stable log is one that is complete, dated, and cannot be quietly edited after the fact, which makes it credible if the IRS examines your return. The more your records look like they were kept in the ordinary course of business, the stronger your position.

Two features make a log especially defensible:

• Rate-stamping per trip: recording the applicable IRS rate at the time of each trip (72.5 cents per mile for 2026) so the correct rate is locked to the correct year, even after the IRS changes it later.
• Append-only records: entries that are added over time and not silently overwritten, which demonstrates the log was kept contemporaneously.

Together these features show that your log is a genuine, ongoing record rather than something assembled at the last minute.

What if you never kept a log this year?

You cannot make a record contemporaneous after the fact, but you are not automatically out of options either. Vehicle expenses sit under the strict substantiation rules of Internal Revenue Code section 274(d), which is why the usual latitude to estimate a deduction from credible circumstantial evidence does not apply to mileage the way it does to some other expenses. In practice that means an undocumented figure is the weakest position you can take into an examination.

The realistic salvage plan has three parts:

1. Rebuild from records that already exist, not from memory. Calendar entries, appointment confirmations, dispatch or job records, client invoices with dates and addresses, and toll or parking receipts each carry a date and a place. Map them into the same columns as the template above and note where each entry came from.
2. Anchor the totals to something physical. Service invoices, inspection reports, and tire or oil-change records often list an odometer reading with a date, which lets you bracket your total annual mileage even if you missed the January and December readings.
3. Start a real log today. A log that is genuine from this week onward and reconstructed for the months before it is a far better record than one reconstructed end to end, and it stops the same problem repeating next year.

Be honest about the result. A reconstruction is supporting evidence, not a compliant log, and an examiner may still reduce the deduction. If the amount at stake is significant, this is the point to involve a tax professional rather than to guess.

How Keel produces audit-stable mileage logs

Keel: Invoice Maker & Receipts is a private, on-device bookkeeping app for self-employed and 1099 workers, and it is built to produce audit-stable mileage logs. Each trip is rate-stamped at the IRS rate — 72.5 cents per mile for 2026 — so your log stays accurate even after the rate changes. Entries go into an append-only verifiable ledger, which is exactly the kind of contemporaneous, unaltered record the IRS wants to see.

Keel keeps everything private. There is no bank connection, no cloud, and no account. Your log is stored encrypted on your iPhone, which is why the App Store shows “Data Not Collected.” You can add trips by hand or with Siri, and you can export your complete log and all other records as a single file whenever you need it for taxes or an accountant. The honest tradeoff is a little manual entry, which is the price of keeping your data yours.

Keel is free with unlimited invoices, receipts and mileage; Pro is a one-time $249.99 Lifetime purchase, not a subscription.

Keep an audit-stable mileage log with Keel — download it on the App Store.

Regional notes for the UK, Canada, and EU

Logbook expectations are similar in spirit abroad, though the rates and forms differ.

• United Kingdom: HMRC expects dated business trip records to support simplified-expenses mileage claims. The rate for the first 10,000 business miles was 45p and rose to 55p from 6 April 2026; the rate above 10,000 miles stays at 25p in both tax years. Our UK self-employed mileage allowance guide works through both, and the current figures are on GOV.UK.
• Canada: The CRA expects a logbook with the date, destination, purpose, and kilometres of each business trip, plus odometer readings at the start and end of the fiscal period. A full base-year log followed by a representative three-month sample in later years is an accepted shortcut, set out under Motor vehicle records on canada.ca. Our guide to Canadian self-employed vehicle expenses covers the rest.
• European Union: Requirements vary by member state, but dated trip logs are generally expected. Consult your national tax authority.

Frequently asked questions

What information does the IRS require in a mileage log? Each entry needs four things: the date of the trip, where you went, the business purpose, and the miles driven. Separately, your records for the year must show total annual mileage from odometer readings, because your business-use percentage is business miles divided by total miles. The exact route and GPS traces are not required.

Does the IRS accept a mileage log I create at the end of the year? It is much weaker evidence. The IRS expects records made at or near the time of each trip, and vehicle expenses fall under strict substantiation rules that leave little room for estimates. A reconstruction built from calendars, client invoices, and job records can support a claim, but an examiner may still reduce the deduction. Start logging now rather than backfilling in April.

How long should I keep my mileage log? Keep it at least three years from the date you filed the return, which is the general IRS assessment window. Some cases run longer: six years if income was substantially understated, and indefinitely if you never filed. If you claim actual expenses and depreciate the vehicle, keep the records until the limitations period runs out for the year you dispose of it.

Do I need odometer readings for a compliant log? Yes, at minimum at the start and end of the year. Those two readings establish your total mileage, and total mileage is what turns your business miles into a business-use percentage — the figure that drives the deduction under the actual expense method and backs up your totals under the standard mileage method. Per-trip odometer readings are useful but not mandatory.

Can I use an app instead of a paper logbook? Yes. The IRS does not prescribe a format, so paper, a spreadsheet, or an app all qualify as long as the record captures the required fields and is kept contemporaneously. An app helps in two ways: entries carry a timestamp as you go, and each trip can be stamped with the rate for the year it happened. Export or back up the data so a lost phone does not cost you the year.

---

This article is general information, not tax advice. Consult a qualified tax professional.