And why choosing the right logbook app matters more than ever
If you use your car for work purposes and want to claim vehicle expenses on your Australian tax return, keeping an ATO-compliant logbook is not optional — it is essential. Yet every year, thousands of Australians either miss out on legitimate deductions or face ATO scrutiny because their logbook records are incomplete, inaccurate, or simply missing.
This guide walks you through exactly what the Australian Taxation Office requires for a valid logbook, how the system works, common mistakes to avoid, and how modern apps like CarSavvy make the whole process effortless — and fully ATO-compliant.
What is the ATO Logbook Method?
The ATO allows two methods for claiming car expenses: the cents-per-kilometre method and the logbook method. The logbook method is almost always more advantageous for anyone who drives more than 5,000 kilometres for work per year, or who has a higher-value vehicle.
Under the logbook method, you calculate the percentage of your total car use that was for work purposes over a continuous 12-week period. This percentage then applies to all your actual car running costs — including fuel, insurance, registration, servicing, depreciation, and loan interest — for the entire financial year.
Example: If your logbook shows 60% business use, and your total annual car costs are $12,000, you can claim $7,200 as a tax deduction. The savings are significant — and the only barrier is maintaining a proper logbook.
What Does the ATO Require in a Valid Logbook?
The ATO is very specific about what constitutes a valid logbook. Under section 900-C of the Income Tax Assessment Act 1997, a compliant logbook must record the following for every work-related trip:
• The date the trip was made
• The odometer reading at the start of the trip
• The odometer reading at the end of the trip
• The number of kilometres travelled
• The reason for the trip (the business purpose)
In addition, the logbook itself must meet these overall requirements:
• It must cover a continuous period of at least 12 weeks
• It must record the odometer reading at the start and end of the 12-week period
• The 12-week period must be representative of your typical work travel pattern throughout the year
• Once established, a logbook is valid for five years — provided your work travel pattern does not change significantly
• If your circumstances change (e.g., new job, different role, different travel patterns), you must start a new logbook
Important: The ATO may request your logbook during an audit. Digital logbooks are fully accepted, provided they contain all required fields. Handwritten logs on paper are still valid but are far more error-prone and easily lost.
The Five-Year Rule: How Long Does a Logbook Last?
One of the most misunderstood aspects of the logbook method is how long a logbook remains valid. A single 12-week logbook can be used for up to five income years — but only under specific conditions.
Your logbook stays valid across five years if:
• Your work travel pattern has not changed substantially
• You keep odometer records at the start and end of every financial year
• The vehicle is still the same (or substantially similar in use)
You must start a new logbook if:
• You change jobs or your duties change, altering how much you drive for work
• You start using a different vehicle
• Your business-use percentage is likely to have changed significantly
This makes the initial 12 weeks critically important. Accurate records during that period set your deduction percentage for up to five years — making precision during this window extremely valuable.
What Counts as a Work-Related Trip?
Not all driving to or from a workplace qualifies as work-related travel. The ATO distinguishes between ordinary home-to-work commuting (which is generally not deductible) and legitimate work-related travel.
Travel that generally qualifies as work-related includes:
• Travel between two separate workplaces (e.g., visiting a client site from your regular office)
• Travel to perform work duties away from your regular workplace
• Travel from home to an alternative workplace when you are not travelling to your regular workplace that day
• Travel carrying bulky tools or equipment that cannot be stored at the workplace
• For rideshare and delivery drivers: all trips made while carrying passengers or goods for payment
Travel that generally does not qualify:
• Daily commuting from home to a fixed regular workplace and back
• Personal errands, even if done in a work vehicle
• Travel between home and work where the only reason it is inconvenient is the distance
Pro tip: Always record the specific business purpose for each trip — not just 'work'. The more descriptive your entries, the stronger your records are if ever queried by the ATO.
Common Logbook Mistakes That Can Cost You
Even diligent drivers make errors that can invalidate their logbook or reduce their claimable percentage. Here are the most common pitfalls:
1. Incomplete trip records. Missing even a few required fields (like the business purpose) can call your entire logbook into question.
2. Not covering the full 12-week period. If your logbook period is shorter than 12 continuous weeks, it is not valid.
3. Missing odometer readings. You need both the start-of-period and end-of-period odometer totals, plus readings for each trip.
4. Not updating after a major change. Using an old logbook after changing jobs or vehicles is a common audit risk.
5. Poor record of business purpose. Writing 'business' is not sufficient. Note the client, location, or task involved.
6. Forgetting odometer records each financial year. Even with a valid five-year logbook, you still need to record odometer readings at 1 July and 30 June each year to calculate your annual business use fraction.
Why a Logbook App Is Now the Smart Choice
Paper logbooks were once the only option. Today, they are also the riskiest. They can be lost, damaged, or left at home on the day you need them. Entries are easily forgotten, especially for frequent drivers.
A dedicated logbook app solves all of these problems — and adds capabilities that paper simply cannot offer:
• Automatic trip detection means you never forget to log a trip
• GPS-based distance recording is more accurate than guessing or relying on odometer checks
• Digital storage means your records are always accessible and backed up
• Instant report generation makes tax time fast and straightforward
• ATO-compliant formatting ensures nothing is missing
Not all logbook apps are created equal, however. The right app should be genuinely effortless to use, cover all ATO requirements, and ideally go beyond just trip logging to help you manage and maximise your entire vehicle-related claim.
Getting Started: Your ATO Logbook Checklist
Ready to start keeping a compliant logbook? Here is a quick checklist to make sure you cover all the bases:
• Download a compliant logbook app (for example: CarSavvy or Drivers Note)
• Note your odometer reading on the day you start your logbook period
• Log every trip for at least 12 continuous weeks, recording the date, start/end odometer, kilometres, and business purpose for each work trip
• Record your odometer reading at the end of the 12-week period
• Calculate your business-use percentage based on the period
• Keep receipts for all car expenses throughout the year — fuel, servicing, insurance, registration
• Record your odometer at 30 June and 1 July each year to maintain your five-year logbook validity
• Review your logbook at the start of each financial year to confirm your circumstances haven't changed
Tax deductions for vehicle expenses can be substantial. The difference between a carefully maintained logbook and a rough estimate can easily amount to hundreds or even thousands of dollars in additional refunds each year. Getting the process right — and using a tool that makes it effortless — is one of the highest-return habits any working Australian driver can adopt.