Logbook vs Cents Per Km: Which Method Suits Ipswich Drivers?

Ipswich business owners who use a car for work have two ways to claim vehicle expenses, and the difference between them can run to thousands of dollars every year. Whether you're a tradie driving between job sites, a consultant visiting clients across Ipswich and the surrounding region, or a sole trader with a growing business, the method you choose shapes your deduction every time you lodge a return.

The two ATO-approved methods are the cents per kilometre method and the logbook method. Each has its own rules, its own documentation requirements, and its own ceiling. The right choice depends on how much you drive for work, what the car costs to run, and whether you're willing to keep records. For the 2026-27 financial year, the cents per km rate is 91 cents per kilometre and the car cost limit for depreciation purposes is $69,883.

Skyways Accountants helps Ipswich business owners work out which vehicle deduction method delivers the better outcome for their situation, starting with a free consultation.

Below, we walk through how each method works, what the ATO requires, and how to decide which approach is right for you.

How the two vehicle deduction methods work

The cents per kilometre method is the simpler of the two. You multiply your business kilometres by the ATO's published rate, which is 91 cents per kilometre for the 2026-27 financial year. The method covers all car running costs — fuel, insurance, registration, servicing and depreciation — in one calculation. You don't need receipts for individual expenses. You do need a reasonable way to work out your business kilometres, such as a diary or calendar of client visits and job records. The cap is 5,000 kilometres per car, which means the maximum deduction under this method for 2026-27 is $4,550.

The logbook method works differently. You record every trip — business and personal — in a logbook kept continuously for at least 12 weeks. That logbook establishes your business use percentage. You then apply that percentage to your actual vehicle running costs for the full year, including fuel, oil, servicing, insurance, registration and decline in value. There's no kilometre cap. If your car cost $80,000, the depreciation component is calculated on the car cost limit of $69,883 for 2026-27, not the full purchase price. The logbook stays valid for five years as long as your circumstances don't change significantly.

Which vehicle deduction method is better for Ipswich business owners?

For most Ipswich business owners who drive more than about 5,000 business kilometres a year, the logbook method produces a larger deduction. The cents per km method is capped — once you hit 5,000 kilometres, you can't claim any more regardless of how much further you drive. At 91 cents per kilometre, that's a maximum of $4,550 for the year. A tradesperson driving 20,000 business kilometres in a $50,000 ute would almost certainly claim far more under the logbook method once fuel, servicing and depreciation are factored in. Whether the logbook is worth the recordkeeping depends on your specific vehicle costs and driving pattern, which is exactly what we work through with you in a free consultation.

What the ATO checks when it comes to vehicle claims

• Business purpose evidence: the ATO expects you to show that trips had a genuine work purpose. Client addresses, job records and calendar entries all help. Personal trips — including home to your regular workplace — are not claimable.
• Logbook completeness: a logbook must record the date, the start and end odometer reading, the reason for the trip and the kilometres driven for every trip during the 12-week period. Incomplete logbooks are a common audit finding.
• Odometer readings: you need an odometer reading at the start and end of each income year and at the start and end of the 12-week logbook period.
• Timing of the logbook period: the 12 weeks must be representative of your year-round driving pattern. If you drove unusually more during the logbook period, the business use percentage you establish will be higher than your actual usage.
• Car vs other vehicle: the cents per km and logbook methods apply to cars, meaning vehicles designed to carry fewer than nine passengers or goods with a payload under one tonne. Motorcycles and heavy vehicles have separate rules. Utes and vans that fall outside the car definition are treated differently for FBT and for deductions.

How do Ipswich Business Accountants help you get the vehicle claim right?

An EOFY tax planning review is one of the most practical ways to make sure your vehicle deduction method is working as hard as it should. The Skyways Accountants team compares both methods using your actual running costs and driving data, identifies which approach delivers the better result, and checks that your documentation will hold up if the ATO asks questions.

There are a few scenarios where the right choice is less obvious. If you drive close to 5,000 business kilometres a year, the two methods may produce a similar result and the simplicity of cents per km tips the balance. If you have multiple cars used for business, the methods can be mixed across vehicles — a lower-use car might use cents per km while the primary work vehicle uses a logbook. If you've just bought a new vehicle with higher running costs, a logbook started now builds the record that will support the larger deduction going forward.

The common mistakes Ipswich business owners make with vehicle claims

The most consistent problem is claiming home-to-work travel. Trips from your home to a regular workplace are personal, not business, even if you're self-employed. The exception is where your home is your principal place of business — for example, a sole trader who operates from a dedicated home office and drives to client sites from there. Even then, the ATO looks carefully at the facts. Trying to claim commuting kilometres inflates your business use percentage and is one of the first things reviewed in an audit.

The second common mistake is treating the logbook as a one-off task and never updating it. If your driving pattern changes significantly — you move to a new suburb, take on clients in a different area, or start using a second vehicle — the old logbook may no longer represent your actual business use. A mismatch between the logbook percentage and real usage is the kind of error that attracts ATO attention. Treating vehicle claims like the wiring on a house never touched after the original inspection — fine until someone checks, expensive to fix retroactively — is the easiest way to turn a straightforward deduction into an audit finding.

When to start a new logbook and how to use it across years

A logbook is valid for five income years from the year it is first kept, provided the pattern of business use doesn't change materially. That means a logbook you complete in 2026-27 can support claims through to 2030-31 without repeating the 12-week process — as long as you keep odometer readings at the start and end of each year and the business use percentage remains broadly accurate. Starting a logbook when you purchase a new vehicle, change your primary client base, or move your principal place of business is the safest approach. If you're not sure whether your existing logbook still reflects how you actually use your car, an annual tax compliance review is the right time to check.

One detail that catches business owners out: if you sell or dispose of a vehicle mid-year, you can only claim deductions for the period you owned it. If you're using the logbook method, the business use percentage from the logbook still applies, but only to the running costs for the months the car was in your hands.

Frequently Asked Questions

Your Next Steps

Vehicle deductions are one of the most commonly mishandled claims in small business tax returns. The right method, the right documentation, and a logbook that genuinely reflects how you use your car can make a significant difference to your tax position year after year. Getting it right once means the framework holds for up to five years.

Ready to find out which vehicle deduction method will save you more this financial year? Contact the Skyways Accountants team for a free consultation or call 0400 348 482. We'll review your vehicle use, run the numbers on both methods, and make sure your records are in the shape the ATO expects.