The GST set-aside guide for Australian freelancers and agencies

That $11,000 invoice that just cleared feels great. Except $1,000 of it was never yours. That's the GST you collected on behalf of the tax office. You know this. Everyone knows this. And yet every quarter, thousands of freelancers and agencies open their BAS and go "...oh no."

This is the trap the GST system quietly sets for anyone who's self-employed. Not because the maths is hard — it's genuinely not — but because of timing. The money lands months before the bill does, and by the time the bill shows up, you've already spent it.

This guide fixes that. We'll cover how much GST to set aside, the exact moment to move it, and where to park it so it's there when the BAS lands. General information only — not financial advice — but it's the stuff nobody tells you when you first register.

Why GST feels like revenue (and why that's the whole problem)

Here's the mechanic. Once you're registered for GST, you add 10% to your prices. A $10,000 project becomes an $11,000 invoice. The client pays the full $11,000. It hits your account as one number.

But that extra $1,000 isn't income. You're just holding it for the Australian Taxation Office until your next Business Activity Statement (BAS). You're basically an unpaid GST collector — the tax office's temporary bank account.

The problem is your brain doesn't see it that way. Your account balance says $11,000. Your bookkeeping brain, if you have one running in the background, says "$10,000 is mine." But the balance is louder. So you make decisions — pay yourself, pay a contractor, buy the gear — against the full number. And every dollar of GST you spend is a dollar you'll have to find again, out of pocket, when the quarter closes.

Multiply that across a busy quarter and the gap gets real. Ten of those invoices and you're $10,000 short of what you owe, with nothing set aside to cover it. That's the "oh no" moment. That's the BAS shock. It's not a maths failure — it's a timing failure.

How much GST to set aside as a freelancer or sole trader

Good news: the calculation is dead simple, and there are two ways to get to the same answer.

Do you even need to register? You must register for GST once your GST turnover hits $75,000 or more in a 12-month period, according to the ATO. Under that, registration is optional. If you're not registered, you don't charge GST and none of this applies — skip to the profit section at the end. If you are registered (or about to cross the line), read on.

The forward way. GST in Australia is a flat 10% (ATO). So on a $10,000 project, you add $1,000 of GST and invoice $11,000.

The backward way — the one that actually matters. When a payment lands, you usually see the GST-inclusive total, not the neat pre-tax figure. To pull the GST back out of a total, divide by 11. That's the magic number for set-asides:

GST portion = GST-inclusive payment ÷ 11

Why 11 and not 10? Because the GST is 10% of the pre-tax price, but you're working backwards from a total that's already 110% of the pre-tax price. One-eleventh of $11,000 is $1,000. One-tenth would be $1,100 — too much. Divide by 11.

A worked example

Say you run a small design studio. Here's a quarter:

So across the quarter you collected $46,200, and $4,200 of it belongs to the tax office. If you moved $4,200 aside as those payments landed, the BAS is a non-event. If you didn't, you're now scrambling to find $4,200 you've probably already spent.

One important caveat: this is GST you collected. Your actual BAS liability is GST collected minus the GST you paid on business expenses (your input tax credits) — software, contractors, gear, all the stuff with GST baked in. So $4,200 collected is the ceiling, not the exact bill. The real number is usually a bit lower. Setting aside the full 1/11th is the safe move: worst case, you've over-saved and you keep the difference. For your actual position, talk to your accountant or registered tax agent — that's what they're for.

When to move GST aside: the only moment that reliably works

Here's the part most guides skip, and it's the part that actually determines whether you're ready at BAS time.

You can know the maths perfectly and still get burned. Because knowing you should set aside 1/11th does nothing if you never actually do it. The gap between "I know" and "I did" is where every BAS shock lives.

There's exactly one moment where the set-aside reliably happens: the moment the payment lands.

Not end of month. Not "when I do the books." Not "before the BAS is due." Those are all points where the money has already been sitting in your everyday account, looking spendable, for days or weeks. By then it's mentally yours. Moving it out feels like losing money, so you don't.

But right when a payment clears? The $1,000 hasn't become "yours" yet. You haven't planned around it. Skimming it off the top in that window is nearly painless — it's the difference between never having the money and giving it back. Behavioural-finance people call this a good default; the rest of us call it "out of sight, out of mind, out of trouble."

This is the entire argument for a per-payment habit over a monthly reconciliation. Monthly, you're fighting your own psychology every time. Per-payment, you never let the tax money feel like income in the first place. Same maths, completely different success rate.

The catch: doing it manually, per payment, means catching every single one, dividing by 11, and remembering to make the transfer — every time, forever. Miss a few busy weeks and the discipline quietly collapses. (More on closing that gap in a second.)

Where to park the GST you've set aside

Once you've decided to move it, it needs somewhere to go that isn't your spending account. The whole point is separation.

A few common approaches, in rough order of how well they resist temptation:

• A separate bank account — a second transaction account or a savings sub-account, ideally at the same bank so transfers are instant. Simple, and the balance becomes a running "this is the ATO's, don't touch" number. Some banks let you nickname accounts, which helps ("GST — hands off").
• A high-interest savings account — same idea, but the set-aside earns a little while it waits for the quarter to close. You keep the interest.
• A dedicated GST/tax account offered by some business banking products. Functionally the same as the above; the label just does some of the psychological work.

The mechanism matters less than the separation. What you're buying is a balance you can look at that answers one question — "am I covered for BAS?" — without having to untangle it from your rent, your pay, and your Friday-night order. If the tax money lives in the same account as everything else, it's not set aside. It's just spent-in-waiting.

One more time, because it matters: this is general information, not financial or tax advice, and it doesn't account for your specific situation. How much you ultimately owe depends on your expenses, your credits, your reporting cycle and your structure. Confirm the details with your accountant or a registered tax agent before you rely on any of it.

When BAS is actually due (so you can plan backwards)

Knowing the deadline makes the set-aside feel less abstract. Most small businesses report GST quarterly. Per the ATO, the standard quarterly BAS due dates are:

Lodge online and you may get an extra two weeks on most quarters (Q2 already includes an extension, so no further one there). If a due date falls on a weekend or public holiday, you get until the next business day. Always check your own due dates in myGov or with your agent — cycles vary, and some businesses report monthly or annually.

The takeaway: you get one of these bills four times a year, on a known date, for a known-ish amount. There is zero excuse for it to be a surprise. The only reason it ever is, is that the money wasn't moved when it should have been.

How Handl turns the set-aside into a nudge you can't forget

So the hard part isn't the maths — it's doing the move, every payment, without fail. That's exactly the gap Handl's set-aside reminders close.

Here's how it works. When a client payment lands through Handl, it reads the actual GST on that actual invoice — not an estimate, not a flat guess. It calculates that specific payment's share (proportionally, even for part-payments, and it respects custom project tax rates), and it nudges you: "Payment in — set aside $1,000 GST." Email, in-app, or Slack, whichever you prefer. A daily digest keeps a running quarter total ticking over — "$8,400 collected this quarter" — so you always know roughly where you stand before BAS day arrives.

Two things worth being crystal clear about, because they're the whole design:

1. Handl reminds. You transfer. It does not move, split, hold, or save your money. There's no linked bank account and nothing leaves your account automatically. It calculates the number and nudges you; you make the transfer to wherever you park your GST. That's deliberate — your money stays in your control, always.
2. It tells you what you collected, not what you owe. Handl surfaces the GST collected on payments it processed. Your final BAS figure depends on your expenses and credits, which live outside Handl — so, once more, that's an accountant conversation.

The reminder is auto-created from your tax settings, on by default, and off in one click if it's not for you. And the copy speaks your locale: Australian accounts get the version where BAS day stays boring — because you've been quietly setting aside all quarter, and there's nothing left to panic about.

Boring is the goal. Boring means covered.

The one habit that kills BAS shock

Strip it all back and the whole guide is one sentence: move 1/11th of every payment the moment it lands, into an account that isn't your spending account.

The maths is a two-second division. The account is a five-minute setup. The only genuinely hard part is remembering to do it, every time, when the money looks so spendable — and that's precisely the part worth automating a nudge for.

Do that, and BAS day goes from the scariest date on your calendar to the most boring. Which, when it's the tax office, is exactly what you want.

This article is general information only and does not constitute financial, accounting or tax advice. GST rules depend on your individual circumstances. Figures are current as at publication and sourced from ato.gov.au; always confirm current rates, thresholds and due dates with the ATO or a registered tax agent. Curious about the non-tax version of the same idea — paying yourself and your profit first? Read Profit First envelopes that fire themselves.