The Accountants

Why You Need a Logbook for Your Tax Return

Keeping a logbook might seem like a hassle, but it can make a huge difference when it comes to claiming work-related travel expenses on your tax return. The Australian Taxation Office (ATO) requires detailed records to validate these claims, and a properly maintained logbook is your best proof. Here’s everything you need to know about why a logbook is essential, how to keep one, and how it can save you money at tax time.

1. Why Does the ATO Require a Logbook?

The ATO needs to ensure that claims for work-related vehicle use are accurate and not overstated. A logbook helps demonstrate how much of your car usage is genuinely for work purposes, rather than personal trips. Without one, you may not be able to claim your full entitlement, and in some cases, your claim could be denied altogether.

2. What Expenses Can You Claim with a Logbook?

If you use your car for work, you can claim deductions for:

• Fuel and oil costs
• Repairs and maintenance
• Registration and insurance
• Depreciation (wear and tear on the vehicle)
• Lease or loan interest (if applicable)

However, without a logbook, you may have to rely on the cents-per-kilometre method, which often results in a lower deduction.

3. How to Keep a Proper Logbook

To be valid, your logbook must:

• Be kept for 12 consecutive weeks (it remains valid for five years unless your work usage changes significantly).
• Record every work-related trip, including:
  • Date of travel
  • Odometer reading at the start and end of the trip
  • Number of kilometres travelled
  • Purpose of the trip
• Be completed for each vehicle you claim expenses for.

For example, if you’re a real estate agent using your car to visit properties, you should log each trip from the office to each house inspection, including the return journey.

4. Example: How a Logbook Can Maximise Your Claim

Let’s say Jane is an IT consultant who drives between client sites and her home office. She keeps a logbook for 12 weeks and determines that 60% of her car use is work-related. Over the year, her total vehicle expenses amount to $10,000. With a logbook, she can claim $6,000 (60% of $10,000) as a tax deduction. Without a logbook, she would have to use the cents-per-kilometre method, which might only allow her to claim a few hundred dollars.

5. Digital vs. Paper Logbooks

While a traditional paper logbook is still acceptable, digital logbook apps are a great alternative. Apps like ATO’s myDeductions or third-party apps like Driversnote or Vehicle Logbook make logging trips easier by automatically tracking mileage and generating reports.

6. What Happens If You Don’t Have a Logbook?

If you claim vehicle expenses without a logbook and your return is audited, the ATO may disallow your deduction. This could result in additional tax to pay, plus penalties and interest. A logbook is a simple way to ensure compliance and maximise your deduction.

7. Final Reminder – Start Your Logbook Today!

If you use your car for work, don’t wait until tax time to start keeping a logbook. The sooner you begin tracking your trips, the better prepared you’ll be when filing your tax return. Need help? A tax agent can guide you on the best way to maintain your records and claim your maximum deduction.

A little effort now can mean big savings later – so start your logbook today!

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