Everyone writes about buying shares. Almost nobody writes properly about how to sell shares in Australia — which is strange, because selling is where the real money decisions happen, where the tax bill gets created, and where three or four small, invisible timing choices can each cost you hundreds of dollars without you ever realising it. This guide is specifically about those choices.
The 12-month rule most people get almost right
Everyone “knows” that holding shares for over 12 months gets you a 50% Capital Gains Tax discount in Australia. Fewer people know the date that actually counts is the contract date — the day you placed the trade — not the settlement date two business days later. Sell one day too early, and an entire gain that should have been taxed at half rate gets taxed in full.
A worked example
At a 32.5% marginal tax rate, that single day of patience is the difference between roughly $3,250 and $1,625 in tax on the same trade — over $1,600, for waiting 48 hours. This is the single most expensive mistake covered in this guide, and it’s almost never mentioned in generic advice on how to sell shares in Australia.
Dividends: the timing trap around selling
If you sell on or after the ex-dividend date, you keep the upcoming dividend (and any attached franking credit) even though you no longer own the share. Sell before it, and the new owner gets paid instead — you don’t. This single date can be worth hundreds of dollars on a larger holding, and it’s set by the exchange, not negotiable.
You miss the dividend
The buyer receives the upcoming dividend and franking credit instead of you.
You keep the dividend
You’re still entitled to the upcoming payment, even though you’ve already sold.
The ATO rule almost nobody mentions: wash sales
Selling a losing share purely to “crystallise” a tax loss, then buying back a near-identical position days later, is exactly the pattern the ATO calls a wash sale — and it can be challenged under Part IVA general anti-avoidance rules, with the claimed loss disallowed entirely. The loss itself isn’t the problem; doing it with the specific intent of manufacturing a tax deduction while keeping your actual market position unchanged is.
How to sell shares in Australia: the CommSec example, step by step
The mechanics are broadly similar across most Australian brokers, but here’s the concrete flow on a typical platform:
- Log in and locate the holding in your portfolio view.
- Select “Sell” next to the specific holding, not a general order screen.
- Choose order type — “At Market” for immediate execution, or a limit price for more control.
- Confirm quantity — partial sells are usually allowed, not just all-or-nothing.
- Review before confirming — check the brokerage fee and settlement date shown before you submit.
How do I sell stocks if my shares are held differently?
This is the part that genuinely surprises people: not all Australian shareholdings are structured the same way, and it changes how you sell.
| Structure | What it means | Selling process |
|---|---|---|
| CHESS-sponsored (HIN) | You hold shares directly under your own Holder Identification Number | Sell through any broker you authorise against that HIN |
| Custodial / nominee | The broker holds shares in its own name on your behalf | Sell only through that specific broker’s platform |
Custodial structures (common on some low-cost micro-investing apps) are usually simpler day-to-day, but mean you can’t simply transfer the shares to sell through a cheaper broker later — worth knowing before you pick a platform for a large, long-term holding.
Before confirming any sale, check the brokerage fee, the settlement timeframe (standard T+2), and whether an upcoming ex-dividend date is a reason to wait a day or two. All three take under a minute to check and can each affect your actual proceeds.
Frequently Asked Questions
How do you sell shares in Australia?
Through the same broker or platform used to buy them, by selecting the holding, choosing a market or limit sell order, and confirming the quantity — settlement typically completes within two business days.
Does selling shares one day early really affect my tax?
Yes — the 50% CGT discount requires the shares to have been held for more than 12 months based on the contract date, so selling even a day before that threshold can double the taxable portion of the gain.
What is a wash sale and is it illegal?
A wash sale is selling an asset to claim a tax loss and then buying back a near-identical position shortly after. It isn’t automatically illegal, but the ATO can disallow the claimed loss under general anti-avoidance rules if the primary purpose was tax benefit rather than a genuine change in investment position.
Do I keep the dividend if I sell my shares?
Only if you sell on or after the ex-dividend date — selling before it transfers the right to that dividend to the new owner.
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