Guide

Using Google Timeline for Mileage Tax Deductions

Updated July 2026 · 7 min read

If you drive for work — client visits, deliveries, site inspections — the distance is very often tax-deductible or billable to a client. The hard part isn't the deduction itself, it's proving it. Google's Timeline already has a GPS-accurate record of everywhere you've driven; the trick is turning it into a mileage log that would hold up if it were reviewed.

What a compliant mileage log actually needs

Most tax authorities (the IRS in the US, HMRC in the UK, CRA in Canada, ATO in Australia) expect broadly the same core fields for each trip, even if the exact rules differ:

Field	Why it matters
Date	Establishes when the trip happened
Start and end location	Shows the route was plausible for the stated purpose
Distance	The actual number the deduction or reimbursement is based on
Purpose / category	Separates deductible business trips from personal ones

A log built after the fact from memory rarely survives scrutiny. A log built from GPS timestamps captured automatically as you drove is a much stronger record — which is exactly what Timeline data is.

From Timeline export to mileage log

1. Export your Timeline (see our Timeline export guide if you haven't already) and open it in Time-mile.
2. Use the activity type and date filters to isolate driving trips within the tax period you're reporting.
3. Review the start and end location columns and tag or separate anything personal — the tool won't know which trips were business versus personal, that judgment call is still yours.
4. Export a PDF report for a formatted, presentable document, or CSV if you need to combine it with a mileage rate spreadsheet.

Why this matters more than it seems

Mileage deductions and reimbursements are one of the most commonly flagged items in expense audits, precisely because they're so often reconstructed from memory. A record with GPS-backed timestamps and distances, generated automatically rather than typed in after the fact, is a materially stronger position to be in if anyone ever asks for it.