How to Choose a Share Trading Platform in Australia

1. Start with how your shares will be held🔗

Before fees, before apps, before anything: decide where your shares will actually live.

Australian shares sit on the ASX's CHESS register, and there are two ways a platform gets them there. CHESS sponsored means your shares are registered in your own name under your Holder Identification Number, or HIN. A custodian, sometimes called a nominee, holds them in its own name and records your entitlement on its own books. You get an account instead of a HIN. The CHESS sponsorship and HINs explainer has the detail.

This comes first because it is the only decision on this list you cannot cheaply reverse. Brokerage you can change next month by moving. Structure gets into your cost base. Leave a custodian and you may have to sell and rebuy, which is a capital gains tax event, and it restarts the 12-month clock on the 50% CGT discount for Australian resident individuals. You can lose a year of discount simply by changing platforms. No fee comparison table will warn you, because it is not a fee.

Some platforms register ASX shares in your name under a HIN. Others are custodians. CHESS sponsored brokers make moving cleaner. Custodians often make cheaper brokerage or fractional shares possible, so it is a trade rather than a verdict either way.

US shares work differently. There is no CHESS register for them, so whichever platform you use, your US holdings sit with a custodian or a US broker-dealer. The HIN question is an ASX question.

2. Then work out which markets you need🔗

Now narrow to markets, because your market decides which costs even exist.

If you will only ever buy ASX shares and ASX-listed ETFs, half of this page stops applying to you. No currency conversion. No W-8BEN. No US estate tax questions. A platform's US brokerage is irrelevant, however good it looks on a banner.

Add US shares and a second cost stack switches on: brokerage on the order, the currency conversion spread, US regulatory fees, funding and withdrawal mechanics, dividend withholding tax, and the W-8BEN form you complete so the platform applies the treaty rate. Add markets beyond the US and check each one separately, because a platform that is cheap on the ASX is not automatically good on London or Tokyo.

So the honest answer to "best broker for US stocks in Australia" is that it depends on you: how often you convert, how much at a time, and how long you hold. Same story with the best broker for ETFs in Australia. It usually comes down to your order size rather than the ETF label. If funds are new to you, what an ETF is is worth ten minutes first.

3. Then check the platform supports your actual habit🔗

Features are easy to compare and mostly beside the point. Habit is what decides your bill.

Are you a fortnightly $300 buyer or a twice-a-year $10,000 buyer? Those two people need different things. A fortnightly buyer lives or dies on minimum order sizes and fractional shares, because a fixed fee is a bigger slice of a small order. A lump-sum buyer barely notices.

Ask blunt questions. Is there a minimum first deposit? A minimum order value? Can you buy fractional US shares? Three minimums are confirmed as at 19 September 2026: Superhero from $10, Vanguard Personal Investor $200, and Stake fractional US shares from US$10. For every other platform, check before you open an account, because we have not verified those.

Can you set a recurring buy, or do you place each order by hand? Can you see your cost base and buy dates without exporting a spreadsheet? A platform that fits your habit is one you will still be using in three years. One that fights it gets abandoned, and abandoned accounts are the expensive ones.

4. Only then compare what it costs🔗

Now cost. And notice how few platforms are left by the time you get here.

Brokerage fees in Australia come in three shapes. A flat fee per order, so one price whatever the size: Stake charges A$3 on ASX orders up to A$30,000. A percentage of trade value with a floor: Interactive Brokers Australia charges 0.08% on ASX orders with a minimum of A$6.00. And tiered pricing, where the percentage drops as the order grows, common at the full-service, bank-owned end of the market.

The shape matters more than the number on the banner. A flat A$3 fee is 0.6% when the order is A$500 and 0.06% when it is A$5,000. Interactive Brokers Australia's A$6.00 floor works out at 1.2% on an order of A$500, even though the headline rate is 0.08%. Same platform, same rate card, and the cost as a share of your money differs fifteen-fold depending on your order size.

Two more things before you rank anything. Brokerage generally attracts 10% GST, so if the advertised figure excludes GST, that is the number that actually leaves your account. And the round trip counts: you pay on the buy and again on the sell. A platform quoting "$3 per trade" means $3 each way, or $6 on a full round trip before GST.

5. The cost that is not on the pricing page🔗

Here is the fee that never gets its own line in a comparison table.

When you buy a US share, your Australian dollars become US dollars first, and the platform makes that exchange at a rate with a margin built in. That margin is the currency conversion fee. It appears as a slightly worse exchange rate rather than a fee line, which is precisely why it slips past anyone comparing brokerage.

Published rates run from 0.002% up to 0.60% as at 19 September 2026, and the cheap end carries a floor. Interactive Brokers Australia charges 0.002% on client-initiated conversions with a minimum of US$2.00. CMC Invest charges 0.60% on international orders and $0 brokerage on US shares. Stake charges 0.55% on AUD to USD conversions. That is a three-hundred-fold gap across the headline rates, and then a US$2.00 floor flips the maths again on small conversions.

Two features make it bite. It is a percentage, so it scales with every dollar converted rather than with the number of trades you place. And you usually pay it twice: once converting in, once converting out. A 0.60% round trip on a A$5,000 position is A$60 before the share price has moved a cent.

Then hunt for the rest of the invisible list: funding and withdrawal costs, account or inactivity fees, data fees, per-share US regulatory charges that turn up on the contract note, and any second conversion when you take money out.

6. What it costs to leave🔗

Nobody checks this before signing up. It is also the section that listicles never reach.

Ask three questions. What does the platform charge to transfer holdings out? What does it charge to close the account? And can you take your holdings with you, or only your cash?

If you hold ASX shares under a HIN, moving brokers is a transfer. Your holdings, your buy dates and your cost base travel with you. If you are with a custodian, leaving often means selling and rebuying, which triggers CGT and restarts the 12-month discount clock. That is a genuine cost and it appears on no pricing page anywhere.

We have not verified exit or transfer-out fees for any platform on our comparison page, so treat them as unknown until you have read the fee schedule yourself. An account you are happy with has no exit cost. An account you are stuck in does.

7. What your tax reporting will look like🔗

Last question, and it is an annual one.

Every platform gives you contract notes and an annual tax statement. What differs is how much work sits between those documents and a finished return. Check whether your buy and sell data pre-fills into tax software, whether the platform tracks cost base properly when you buy the same share in several parcels, and whether it keeps records for holdings you have since sold.

Hold shares for at least 12 months before you sell and you may qualify for the 50% CGT discount as an Australian resident individual, so the dates need to be right and the platform needs to hold them. Capital gains tax on shares covers the mechanics.

US shares add a second layer: dividends with tax withheld at the treaty rate, which you claim back through a foreign income tax offset, plus a W-8BEN that needs renewing when your circumstances change. Tax offsets in Australia explains how the offset works. A platform that reports cleanly saves you part of an accountant's hourly rate every year.

8. Putting it together🔗

The order is the argument. Holding structure first, because it is the hardest to undo. Markets second, because they decide which costs exist at all. Habit third, because it decides which costs bite hardest. Cost fourth, and only then, because cost without the first three is a number with no context.

Then the three sections most rankings never reach: the hidden conversion cost, the exit cost, and the tax paperwork. Search "online broker Australia" and you will get lists that start at step four and stop at step five. That is not laziness, it is the business model. A published rate is easy to scrape and easy to rank, and holding structure is not.

🎯 The essential: Write down how you will hold your shares, which markets you will buy, and your realistic order size and frequency. Cross off anything that cannot handle those three. Then compare what is left on total cost, including conversion, minimums and GST. Then read the exit fees and the tax reporting. If two platforms tie on all of it, pick the one you will actually open.

Frequently asked questions🔗