About AussieTools

AussieTools is the calculator library of ECTD, an Australian digital publisher focused on plain-English money, tax and AI education. We build the 11 calculators on this site for one reason: most financial calculators online are either US-centric, buried in ads, or demand your email before showing a number. Ours are free, Australian, and instant.

How the numbers are calculated

Every calculator publishes its methodology on the page — the formulas, the brackets, and worked examples. Rates and thresholds come from primary sources: the ATO for income tax, HECS-HELP and GST; each state and territory revenue office for stamp duty; and the RBA for indicative exchange rates. Where a calculator involves assumptions (like investment returns in the compound interest tool), we say so on the page and default to conservative figures.

How often they're updated

Tax and threshold-based calculators are reviewed each financial year (current: 2025–26) and whenever a legislated change lands mid-year — like the HECS-HELP marginal repayment system that took effect on 1 July 2025. If you spot a number that looks out of date, email hello@ectd.com.au and we'll check it against the source.

How the site is funded

AussieTools is free to use and funded by display advertising. The provider cards you see on some calculators are editorial recommendations — we are not currently paid for them and they carry no affiliate tracking, so they are labelled "Recommended tool" rather than "Sponsored". If that ever changes, any paid placement will be labelled "Sponsored" and tagged accordingly, and we will update this page. Either way, outbound links never change a calculator's result — the maths is the maths, and we only list providers we would genuinely shortlist ourselves.

What these tools are not

Calculators produce estimates from the inputs you give them. They are general information, not personal financial, tax or credit advice, and they don't consider your circumstances. For decisions that matter — buying property, restructuring salary, choosing investments — talk to a licensed adviser, a registered tax agent, or your lender.

Privacy

The calculators run in your browser — the figures you type are not stored on our servers, and there is no signup. Our full privacy policy, covering cookies and advertising, lives at ectd.com.au/privacy.

More from ECTD

If the calculators help, the long-form guides go deeper: plain-English articles on tax brackets, stamp duty, HECS changes, super basics and first-home costs, plus free downloadable guides.