Four free tools that do the arithmetic the ATO’s own pages leave to you. No sign-up, no paywall — every one runs on the same verified tax engine as the Taxplain chatbot.
Rates verified against the ATO · 2025–26 and 2026–27
Work out roughly how much of your business profit to put aside for tax — income tax, Medicare and HELP/HECS, for 2025–26 or 2026–27.
Open calculator →Compare the 70c fixed-rate method against actual cost, see which gives the bigger claim, and the tax that claim would actually save.
Open calculator →Cents-per-kilometre against the logbook method, at the current ATO rate — with the tax saving at your marginal rate.
Open calculator →A free, ATO-compliant record of your work-from-home hours for the fixed-rate method. Log hours, print or save as PDF.
Open tool →Got a question the calculator doesn’t answer?
Taxplain answers everyday Australian tax questions in plain English, grounded in public ATO guidance. The first few questions are free.
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General information only, based on current ATO rates — not personal tax advice. Every calculator here is an estimate; your actual position is determined by the ATO when you lodge. Confirm at ato.gov.au or with a registered tax agent. Built by a CPA-qualified accountant. Taxplain is independent and not affiliated with the ATO.
Taxplain.com.au — tax, in plain English