About us

Free CGT tools, built by an independent team

We’re an independent group of tax, finance and software professionals. We built CGT Calculator Australia because working out capital gains tax shouldn’t need a spreadsheet, a paywall or a sales call.

Reviewed 16 October 2026Sources: ATO, Treasury, Parliament

Why we built this

Selling an investment property, a share portfolio or some crypto is one of the biggest tax moments in most people’s lives. Yet the usual options are a rough rule of thumb, a calculator that hides its maths, or paying someone just to find out roughly what you’ll owe.

We think people deserve better: a free tool that shows every step, links each rule to the ATO, and is honest about what it doesn’t know. That’s what this site is. No sign-up, no lead forms, and nothing you type leaves your browser.

Free, foreverEvery calculator and guide is free to use. No accounts, no paywall, no “speak to an adviser to see your result”.

Working shownEach result breaks down step by step, with a link to the ATO rule behind it, so you or your accountant can check it.

Private by designCalculations run in your browser. We don’t collect, store or sell the figures you enter.

Who we are

CGT Calculator Australia is run by a small, independent group of people with backgrounds in tax, accounting, financial planning and software engineering. Between us we’ve prepared returns, modelled property and share portfolios, and built financial software – and we kept seeing the same confusion about how CGT is actually worked out.

We work on this site in our own time as a public resource. We aren’t a bank, broker, accounting firm or comparison site, and we aren’t affiliated with the Australian Taxation Office or any government agency.

What we stand for

Primary sources only. Rates, rules and dates come from the ATO, Treasury, the Federal Register of Legislation and the Parliamentary Library. Every page lists its references.
Show the working. If we can’t explain a number, we don’t show it.
Be upfront about limits. Each calculator says what it doesn’t cover, and our methodology lists the assumptions – for example, how we model the 1 July 2027 rules while parts are still in draft.
Plain English. Written for the person selling the asset, not for other tax professionals.

How we keep it accurate

Tested against official examples. Our calculation engine must reproduce the ATO’s and Treasury’s published worked examples before the site can be built. You can see the live test results.
Independent fact-checking. Before publishing, each section of the site is checked claim by claim against primary sources by reviewers who didn’t write it.
Scheduled reviews. We re-check rates and rules every 1 July, after each federal Budget, whenever the law or ATO guidance changes, and at least every quarter. Every page shows its last review date.
Fast corrections. Confirmed errors are fixed within two business days.

Independence & funding

We don’t accept payment to feature products, and nothing on the site is a paid placement. Our content isn’t influenced by advertisers, lenders, brokers or accounting firms. If we ever add advertising or partnerships to cover running costs, they’ll be clearly labelled and kept separate from the calculators and guides, and we’ll update this page first.

Corrections & contact

Spotted something that looks wrong, or a situation our calculators don’t handle? Email hello@cgtcalculatoraustralia.com with the page and, if you can, the source. We read everything.

Important

Our calculators and guides are general information, not personal financial or tax advice. They don’t consider your full circumstances. For advice, speak to a registered tax agent or licensed financial adviser.

General information only – not financial or tax advice. See our disclaimer. Spotted an error? Email hello@cgtcalculatoraustralia.com.