If you have sold shares, cryptocurrency, or an investment property and made a profit, the Australian Taxation Office (ATO) wants its share. That share is called capital gains tax, or CGT. It is one of the most misunderstood parts of the Australian tax system, partly because of a generous rule known as the 50% discount. Here is a clear, plain-English guide to how it all works in 2026.
What Exactly Is Capital Gains Tax?
A capital gain is the profit you make when you sell an asset for more than you paid for it. The asset could be shares, a rental property, cryptocurrency, a managed fund, or even a valuable collectible. CGT is not a separate tax with its own rate. Instead, your net capital gain is added to your taxable income and taxed at your normal marginal rate.
This is a crucial point that trips many people up. There is no flat CGT rate in Australia. If you are a high earner in the 45% bracket, a large gain could be taxed at up to 45% (plus the Medicare Levy). If you have low income in the year you sell, the same gain might be taxed far more gently.
To see which marginal bracket your gain will fall into, add it to your other income and check the result with our Australian salary calculator, or work the gain itself out with our capital gains tax calculator.
The 50% Discount: The Most Valuable Rule in CGT
Here is the rule that makes long-term investing so attractive in Australia. If you are an individual (or you invest through a trust) and you hold an asset for more than 12 months before selling, you only pay tax on half of the gain. The other half is completely tax-free.
Say you bought shares for $20,000 and sold them three years later for $40,000. Your gross gain is $20,000. Because you held the shares for more than a year, the 50% discount applies and you are only taxed on $10,000. That taxable $10,000 is then added to your income and taxed at your marginal rate.
The lesson is simple but powerful: timing matters enormously. Selling an asset at 11 months means you pay tax on the whole gain. Waiting just one more month can halve your tax bill. For big gains, that single decision can be worth tens of thousands of dollars.
How the Maths Works in Practice
Let us walk through a realistic example. Sarah earns $90,000 a year and sells an investment property for a $200,000 gain after holding it for five years. Here is how her CGT is calculated:
- Gross capital gain: $200,000
- Apply the 50% discount: taxable gain becomes $100,000
- This $100,000 is added to her $90,000 salary, giving total taxable income of $190,000
- Most of that $100,000 gain is taxed in the 37% and 45% brackets
Sarah ends up paying roughly $38,000 in extra tax on the sale. Without the 50% discount she would have paid closer to $90,000 — so the discount saved her around $52,000. This is why investors think carefully about which financial year they sell in. Our rental property tax calculator can help you plan the timing of an investment property sale.
What About Cryptocurrency?
The ATO treats most cryptocurrency the same way it treats shares — as a CGT asset. Every time you sell crypto, swap one coin for another, or use it to buy goods, you trigger a CGT event. If you held the crypto for more than 12 months, the 50% discount applies just as it would for shares.
The trap with crypto is record-keeping. Many people make dozens or hundreds of trades and lose track of their cost base. The ATO receives data directly from Australian exchanges, so unreported gains are easy to spot. Keep detailed records of every transaction, including the date, value in Australian dollars, and any fees.
Your Main Home Is (Usually) Exempt
Here is some good news. The home you live in — your main residence — is generally exempt from CGT entirely. When you sell the house you live in, you do not pay a cent of capital gains tax on the profit, no matter how much it has grown in value.
There are conditions and quirks. The exemption can be reduced if you used part of your home to run a business, or if you rented it out for a period while living elsewhere. The "six-year rule" lets you treat a former home as your main residence for up to six years after you move out, which can be very valuable if you move interstate or overseas for work.
Legal Ways to Reduce Your CGT Bill
There are several legitimate strategies to lower the tax you pay on a gain:
- Hold for over 12 months to claim the 50% discount — by far the biggest lever
- Offset gains with losses: If you have other investments sitting at a loss, selling them in the same year can offset your gain. This is called tax-loss harvesting
- Time the sale for a year when your other income is lower, such as during a career break, parental leave, or retirement
- Carry losses forward: Capital losses that you cannot use this year can be carried forward indefinitely to offset future gains
- Make a deductible super contribution in the year of the sale to reduce your overall taxable income — model this with our superannuation calculator
Capital Losses: Turning a Bad Year to Your Advantage
Not every investment makes money. When you sell an asset for less than you paid, you make a capital loss. You cannot deduct a capital loss against your salary or wages, but you can use it to wipe out capital gains. If your losses exceed your gains in a year, the unused portion carries forward to future years with no expiry date.
This is a genuinely useful planning tool. If you know you have a large gain coming, reviewing your portfolio for underperforming assets you were planning to sell anyway can meaningfully cut your tax bill in the same financial year.
When Do You Pay?
CGT is not paid at the moment of sale. Instead, you report your net capital gain in your annual tax return, and it is taxed along with the rest of your income. This means a sale in July gives you almost a full financial year before the tax falls due — useful for setting aside the cash you will owe.
If your sale is large, the ATO may expect you to make a pay-as-you-go instalment in advance, so it is wise to set aside the estimated tax as soon as the sale settles rather than spending the proceeds.
The Bottom Line
Capital gains tax is unavoidable on most profitable investments outside your family home, but it is far from a flat penalty. The 50% discount rewards patient, long-term investors, and smart timing around the 12-month mark and your annual income can dramatically reduce what you owe.
Before you sell any major asset, run the numbers. Use our capital gains tax calculator to estimate the bill, check how the gain interacts with your wages using the salary calculator, and if it is an investment property, factor in the rental history with our rental property tax calculator. A little planning before you click sell can save you a very large sum.