How to Keep a Mileage Log You Could Actually Defend
How to keep a mileage log comes down to writing each business trip on the day you drive it, not in April. Every entry needs the date, start and end odometer readings, total distance, the destination, and the business purpose. Read the odometer on the first and last day of your tax year, keep personal trips out of the business total, and store the log with your vehicle receipts.
Why does a contemporaneous log beat a reconstruction?
A log written the same day is a record. A log rebuilt in April from calendar entries, map history, and memory is an estimate wearing a costume: round numbers, even weeks, trips dated on days you were demonstrably elsewhere. The real answer to how to keep a mileage log starts with timing, not formatting. An entry written before you knew anyone would ask carries weight because you had nothing to gain by writing it.
One line takes 15 seconds; 250 trips a year is barely an hour spread over twelve months, against a lost weekend of reconstruction. A caveat covering everything below: this is not tax advice. Deductible categories, methods, rates, and record requirements differ by country and change yearly, so confirm specifics with your own tax authority or a qualified tax professional.
Mileage Log & Business Expense Tracker (Printable PDF)
- Printable daily trip log sheets
- Odometer and vehicle summary pages
- Monthly receipt and expense tracker
What does a single trip entry need to contain?
Write every line so a stranger could follow it a year later. Records converge on when you drove, how far, and why, but the exact fields you must retain vary, so check yours.
| Field | Example | Why it matters |
|---|---|---|
| Date | 2026-07-14 | Ties the trip to invoices |
| Start odometer | 48,210 | Makes distance checkable |
| End odometer | 48,247 | Closes the trip |
| Distance | 37 | Feeds period totals |
| From → to | Workshop → Ridgeway Dental | Beats "client visit" |
| Business purpose | On-site install, invoice #1042 | Links the drive to documented work |
| Vehicle | Van 1 | Essential once you drive two |
Two habits raise every entry. Name a place, not a category: "client visit" is unverifiable and "Ridgeway Dental" is not. And tie each trip to a document elsewhere — an invoice, job reference, or calendar event — so any line can be corroborated without you.
How do you build odometer discipline that survives a busy week?
Anchor the readings to two moments that already happen: key in, key out.
- Write the start odometer before you shift into gear.
- Write the end odometer and purpose before you unbuckle; once you are out, the entry is gone.
- Photograph the odometer on the first and last day of your tax year.
- Keep service invoices — garages print the odometer reading on them, third-party corroboration a few times a year.
- Reconcile weekly: five minutes checking each day's closing reading against the next day's opening one.
Record whole units exactly as the dash shows them. Never round to the nearest 5 or 10; rounded figures are the fastest way to make an honest log look invented. If you missed a trip, write "not logged" rather than inventing a number. Odometer readings are the spine of the log: cumulative, and impossible to quietly reset.
How do you separate business miles from personal use?
Decide the purpose before you drive. The classification you write at the wheel is a judgement; the one you write in April is a rationalisation, and it reads that way. What counts as business travel — particularly the journey between home and a regular workplace — is among the most country-specific rules there is, so confirm your position rather than assuming a forum rule applies to you.
For mixed trips, log by odometer rather than intention: drive to a client, detour for groceries, then home, and the business leg gets its own start and end readings. Track the denominator too. Opening and closing readings give total distance; total minus business equals personal. That ratio, your business-use percentage, is what many systems want, and no log containing only business trips can produce it.
What changes when you drive more than one vehicle?
One log per vehicle, always. A combined sheet is the most common reason a record collapses: once two odometers share a column, no reading can be checked against the one before it. Give each vehicle its own trip sheets plus a summary page carrying the description, plate, the date it entered business use, opening and closing readings, total and business distance, and the resulting percentage.
Vehicles arriving or leaving mid-year need a reading the day they change status — entering business use, stopping, and the day you sell or scrap it. Those dates are unrecoverable afterwards. Some systems also tie the method chosen in a vehicle's first business year to later years and restrict switching, and that attaches per vehicle, not per person.
Should you pair mileage with receipts — and which ones?
Yes, and doing both costs little. Many systems offer a choice between a flat per-distance rate and actual running costs apportioned by business-use percentage. Which options are open to you, whether you may switch, and what evidence each demands vary by country, so confirm before choosing. Keeping both sets for a year lets your accountant compare real numbers.
File the paperwork supporting either route: fuel, insurance, servicing and repairs, tires, registration, lease or finance interest, parking, tolls, and the vehicle's purchase and disposal documents. Photograph receipts at the point of sale and reconcile them against the log in that same weekly five minutes — a fuel receipt on a date with no logged trip is a question you want to answer now, not in eighteen months. If you prefer paper, the mileage log and business expense tracker keeps trip sheets and expense pages in one binder.
How long should you keep mileage records?
Retention periods differ by country and circumstance, and can extend well beyond the standard window if a return was amended, filed late, or omitted income. Ask your tax authority or accountant for the period that applies, then write it on the folder.
Keep the log and receipts for at least the window applying to the tax year they support, and keep vehicle records for as long as you own the vehicle plus that same window after the year you dispose of it, because a sale or trade-in can carry consequences tied to its history of business use. Store copies in two places, one offline; digital records are fine in most systems if legible and complete, but a phone that dies in month nine takes the year with it.
What are the most common mileage log mistakes?
Six failures account for most weak records: backfilling from memory, which produces entries that contradict your calendar; round numbers, because real drives rarely land on exactly 20 or 50; a purpose column reading "business" on every line; missing opening and closing readings, leaving business distance with no total to divide it by; two vehicles on one sheet; and receipts stored somewhere the log is not.
The seventh actually bites: quitting in March. Most people asking how to keep a mileage log already know what a good entry looks like — they lose the record to attrition, not ignorance. Fix that with placement, not willpower: one printed sheet clipped in the vehicle beats an app three faucets deep. Writing the weekly reconciliation as a short standard operating procedure helps it survive busy weeks.
What else do people ask about keeping a mileage log?
Do photos of the odometer count as a mileage log?
They support one; they are not one. A photograph proves a reading existed at a moment in time, not where you went or why — the part connecting distance to your work. Use photos as anchors: the first and last day of the tax year, the day a vehicle enters or leaves business use, and the day you sell it. Keep the written entries alongside them, because the photographed readings bracket your totals and either confirm them or expose a gap.
What if I forgot to log trips for a whole month?
Do not invent the month. Reconstruct only what documented evidence supports — invoices, delivery notes, calendar appointments, parking receipts — and mark those entries clearly as reconstructed rather than dressing them as contemporaneous. Where nothing supports a trip, leave it out. A log noting "March reconstructed from invoices, gaps excluded" is credible; a March identical in texture to a well-kept February casts doubt on the honest months around it. Ask your accountant how to treat the gap.
Is a paper log still acceptable if I use an app?
In most systems the format matters far less than completeness, accuracy, and legibility, but confirm your own rules. Plenty of self-employed people run both: the app captures distance automatically, and a paper sheet holds the purpose, client, and odometer readings apps often record loosely or not at all. Redundancy protects against ordinary disasters — a lapsed subscription, a dead phone, an export that silently drops a quarter. Back it up monthly and keep receipts in the same place.
Keep it in the glovebox and it costs fifteen seconds a trip: the Mileage Log & Business Expense Tracker has printable daily trip sheets, per-vehicle odometer and summary pages, and monthly receipt trackers so both halves stay together. Invoicing clients from the road too? The free Freelance Get-Paid Starter Kit covers getting paid on time, at no cost.
3 ready-to-send client email scripts + red-flag checklist — see the RESELLOLABS quality before you buy anything.
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