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Capital Gains Tax Calculator

Estimate CGT at your marginal rate with the 50% discount for assets held over 12 months.

Your Details

Asset purchase

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Sale & income

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Results

Estimated CGT Payable

$31,250

Cost base$420,000
Sale price$600,000
Gross capital gain$180,000
CGT payable$31,250
Effective rate on gross gain17.36%

For Australian resident individuals. Does not cover companies, trusts, or foreign residents. CGT events vary β€” this covers the most common disposal scenario.

πŸ“… FY 2025–26 rates Β· Source: ATO β€” Capital Gains Tax

Frequently asked questions β€” capital gains tax

How is capital gains tax calculated in Australia?

Your capital gain is added to your other income and taxed at your marginal income tax rate. If you held the asset for more than 12 months, apply the 50% CGT discount first β€” so only half the gain is assessable income.

What is the CGT 50% discount rule?

Australian resident individuals who held an asset for more than 12 months can discount the capital gain by 50%. For example, a $100,000 gross gain becomes a $50,000 taxable gain, saving $15,000–$22,500 in tax depending on your marginal rate.

What is included in the cost base for CGT?

The cost base includes: (1) purchase price; (2) acquisition costs β€” stamp duty, legal fees, agent fees; (3) capital improvement costs; (4) disposal costs β€” agent commission, legal fees on sale. Daily maintenance and loan interest are generally excluded from cost base but may be deductible as rental expenses.

Is my principal place of residence exempt from CGT?

Yes β€” your main residence is generally fully exempt from CGT if you lived there the entire period of ownership and didn't use it to produce income. If you have ever rented it out or run a business from it, a partial exemption applies proportional to the time it was your main residence.

Can capital losses offset capital gains?

Yes β€” capital losses in the same year are used first to reduce gains. Remaining losses carry forward indefinitely. You cannot offset capital losses against ordinary income (wages, rent). Carried-forward losses must be used before applying the 50% discount.

How does CGT work on investment property in Australia?

When you sell an investment property, the net capital gain (after 50% discount if held 12+ months) is included in your income tax return for that year. Stamp duty and legal fees paid at purchase are in the cost base β€” reducing your taxable gain. Selling agent commission and legal fees on sale are also deductible from the gain.

How is CGT changing from 1 July 2027?

From 1 July 2027, the 50% CGT discount for individuals is being replaced with cost base indexation β€” your purchase price is adjusted upward for CPI inflation, and you pay tax on the real (inflation-adjusted) gain only. A 30% minimum tax floor also applies. Assets sold before 1 July 2027 still get the full 50% discount. For assets held across that date, transitional rules split the gain between the old and new systems. This calculator uses the current rules (50% discount) β€” use it to model gains under the existing regime.

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