Capital gains tax calculator
Estimate the capital gains tax on an Australian property sale, with the 50% discount applied when it's held over 12 months. Co-owners each pay CGT on their own slice — Propact splits the gain per owner inside your dashboard.
Estimate only — general information, not advice. Real capital gains tax depends on your full taxable income, your exact cost base, any capital losses, the main-residence and other exemptions, and current tax rates. The per-owner figure uses an assumed marginal rate you enter and the standard 50% discount for assets held over 12 months. Confirm the binding number with a registered tax agent. Propact does not provide financial, legal or tax advice.
How CGT on property is worked out
Your capital gain is the sale proceeds (price less selling costs) minus your cost base — the purchase price plus buying costs (stamp duty, legal, inspections) and any capital improvements. If that's positive you have a gain; if it's negative you have a capital loss, which can offset gains elsewhere.
For individuals the taxable gain is added to your income for the year and taxed at your marginal rate. Holding the property for more than 12 months generally halves the gain that gets taxed — the 50% CGT discount.
Why co-owners need this
When two, three or four people own a property, each is taxed on their own share of the gain — set by their legal interest on the title. Two owners with the same share but different incomes can owe very different amounts of tax on the same sale.
Propact splits the gain by title share inside your dashboard and applies the discount and an assumed marginal rate per owner, so you can see each person's likely position before you sit down with an accountant.
Capital gains tax — common questions
What is capital gains tax (CGT) on property?
Capital gains tax is the tax on the profit you make when you sell an asset like property. The gain is the sale proceeds minus your cost base (what you paid plus buying, holding and selling costs). For individuals it's added to your taxable income and taxed at your marginal rate — it isn't a separate flat tax.
How is the 50% CGT discount applied?
If you hold the property for more than 12 months before selling, individuals (and trusts) generally get a 50% discount on the capital gain — only half of it is added to your income. The calculator applies this automatically when you mark the asset as held over 12 months.
How is CGT split between co-owners?
Each owner is taxed on their share of the gain, based on their legal interest in the title. Inside Propact, your dashboard splits the total gain by each owner’s title share, then applies the discount and an assumed marginal rate per owner — so two co-owners on different incomes can owe very different amounts.
Is my main residence exempt from CGT?
Your main residence is usually exempt from CGT, but the rules have conditions (and partial exemptions apply if a home was rented out or you owned it before moving in). This tool gives a general estimate and does not model the main-residence exemption in detail — always confirm with a registered tax agent.
Is this CGT calculator accurate?
It’s an educational estimate. Real CGT depends on your full taxable income, the exact cost base, any capital losses to offset, the main-residence and other exemptions, and current tax rates. Use this to understand the mechanics, then confirm the binding number with a registered tax agent.
Selling a property you co-own?
Propact tracks who paid what, splits the gain fairly, and works out a clean buyout — so an exit doesn't turn into an argument.
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