Calculators
Quick arithmetic, correct rates.
Two calculations clients ask for most, at this year's rates. Nothing you type leaves your browser.
GST calculator
Add GST to a price, or find the GST inside a total. GST is 10%.
- Amount before GST
- $0.00
- GST
- $0.00
- Total including GST
- $0.00
For GST-registered businesses. Some supplies are GST-free or input-taxed; the calculator assumes a taxable supply.
Cents-per-kilometre calculator
Work-related kilometres in your own car at the 2026–27 rate of 91 cents, capped at 5,000 km.
- Kilometres claimed
- 0 km
- Rate
- 91 c/km
- Deduction
- $0.00
The rate covers fuel, servicing, registration, insurance and depreciation; nothing else is claimed on top. Above 5,000 km the logbook method applies; our Vehicle Logbook template does the arithmetic. Trips between home and a regular workplace are not work-related.
Rates current for 2026–27, reviewed 21 September 2026. These calculators give an estimate for general information only; they do not take your circumstances into account and are not a substitute for advice. The record templates on the Resources page hold the evidence the ATO expects.
Want the deduction checked, not just calculated?
Send us a message and we will tell you which method suits your situation and what records to keep.