What is Capital Gains Tax?
Capital gains tax (CGT) is a tax on the profit you make when you sell an asset for more than you paid for it. In Australia, it's not a separate tax — it's treated as income and taxed at your marginal tax rate. So if you buy a share for $1,000 and sell it for $1,500, that $500 profit is a capital gain, and the ATO wants to know about it.
The key thing to understand is that you only pay CGT when you actually sell the asset. Just watching your investment grow in value doesn't trigger any tax — it's only when you realise that gain by selling that CGT comes into play.
What Assets Are Subject to CGT?
Most assets you own can trigger CGT, including:
- Shares and managed funds
- Investment properties (but not your main home in most cases)
- Cryptocurrencies
- Artwork, collectibles, and jewellery over $500
- Rental properties
- Land and vehicles used for business
There are some important exceptions. Your primary residence is generally exempt from CGT, which is why property investment is popular in Australia. Personal use assets like your car or furniture don't trigger CGT either.
The 50% Discount (Individuals Only)
Here's where Australia's CGT system becomes interesting. If you're an individual and you've held an asset for at least 12 months, you only need to include 50% of your capital gain in your taxable income. This is called the capital gains tax discount.
So let's say you made a $10,000 capital gain on shares you held for over a year. You'd only include $5,000 in your taxable income. If you're on a 37% tax bracket, you'd pay tax on $5,000 rather than $10,000 — a significant saving.
Hold the asset for less than 12 months? You don't get the discount, and the full gain is treated as regular income. This is why many investors hold assets longer rather than chop and change.
What About Capital Losses?
The flip side of capital gains is capital losses. If you sell an asset for less than you paid for it, you can use that loss to offset capital gains in the same year or carry it forward to future years. This is called loss harvesting, and it's a legitimate tax planning strategy.
For example, if you made a $10,000 gain from one investment but a $3,000 loss from another in the same financial year, you'd only be taxed on a $7,000 net gain. However, capital losses can't be used to offset other types of income — only other capital gains.
How to Calculate Your Capital Gain
The calculation is straightforward: Sale price minus purchase price equals your capital gain. But there's a bit more to it in practice:
- Include any costs associated with buying (brokerage, legal fees, valuations)
- Include any capital expenditure that improved the asset's value
- For shares, costs include brokerage and fees when buying and selling
Keep good records of your purchase price, date of purchase, and all costs involved. The ATO will ask for this if you're audited.
Reporting to the ATO
You need to report all capital gains (and losses) on your tax return, even small ones. When you sell shares through an Australian broker, you'll usually get a statement detailing the transaction. For property, you'll need to track this yourself.
The ATO has access to data from brokers and financial institutions, so they'll know if you've sold assets. Failing to report CGT is tax evasion, and the penalties are steep — much worse than just paying the tax you owe.
A Few Final Thoughts
CGT isn't something to fear — it's simply the tax on investment profits. The Australian system is actually quite generous compared to other countries, especially with the 50% discount for long-term holdings. Knowing how it works helps you make better investment decisions and plan your finances more effectively.
If you're serious about investing, understanding CGT is part of being financially literate. And remember — paying CGT means you've made a profit, which is a good problem to have.