Logbook vs Cents-per-km
ATO-focused method comparison for drivers deciding between a detailed logbook workflow and the simpler cents-per-kilometre approach.
When the logbook method may be stronger
- You need a method tied more closely to actual car expense patterns.
- You are prepared to maintain stronger records across the year.
- Your work-use percentage matters enough to justify the extra admin.
- An adviser wants a fuller substantiation path before filing.
When cents per kilometre is the simpler path
- You want the fastest estimate using the published cents-per-kilometre rate.
- You are planning around smaller or simpler work car claims.
- You prefer a lighter workflow than a logbook-heavy method.
- You want to move directly from rate lookup to deduction estimate.
Comparison matrix
Speed
Logbook method: Slower setup because records and percentages matter more
Cents per kilometre: Fast estimate from distance and the published rate
Record burden
Logbook method: Higher because the method depends on stronger supporting evidence
Cents per kilometre: Lower for quick planning, though records still matter
Sensitivity to actual costs
Logbook method: More sensitive to the vehicle's real expense profile
Cents per kilometre: Less sensitive because the published rate is fixed
Best fit
Logbook method: Detailed claim preparation
Cents per kilometre: Quick annual estimate and simple workflows
Decision checklist
- Do you want the fastest estimate or the more detailed method comparison?
- Can you support a logbook-style evidence trail if required?
- Are actual car costs likely to diverge materially from the standard rate assumption?
- Will a simple estimate be enough for your next decision?
Next steps
Open the calculator, rate guide, or template that matches the side of the comparison you want to act on next.