Most trade and service business owners think of the BAS cycle as a fixed feature of the landscape. Four times a year, the bill lands, you find the money or you don't. It is not fixed. The ATO can move you to monthly GST reporting, and over the past eighteen months it has been doing exactly that.
In March 2025, as part of what it called the 'Getting it right' campaign, the ATO notified 3,500 businesses with a history of non-compliance that they were being shifted from quarterly to monthly GST reporting, effective 1 April 2025. In July this year the ATO published fresh guidance on the whole thing, and the campaign page now says plainly that it will keep moving businesses with a poor compliance history onto monthly reporting as part of its broader compliance approach.
If you've been late a few times, this is worth ten minutes of your attention. Not because it's a penalty — it isn't — but because it changes your cash cycle, and finding out by letter is a lot worse than deciding for yourself.
What actually triggers it
The ATO says it will direct you to monthly GST reporting if any of three things apply: your business meets the tax period turnover threshold, you'll be running your business in Australia for less than three months, or you have a history of failing to comply with your tax obligations.
The third one is the one that catches ordinary businesses, and the ATO spells out what it means: lodging or paying late, failing to lodge or pay at all, or reporting your obligations incorrectly. The original campaign targeted businesses that had also stopped responding to ATO contact.
Read that list again with your own last two years in mind. Nothing there requires anything dramatic. A stretch where you lodged three BAS a fortnight late, a payment plan you defaulted on, an income tax return still outstanding — that's the profile. It's the profile of a busy business having a rough patch, which is most of them at some point.
You'll be notified in writing if it happens. If you disagree, you can lodge an objection, but you've got 60 days from the date you were notified of the decision, so it is not something to put in the ute glovebox and deal with later.
What changes on the BAS itself
Three practical things.
First, the due date. A monthly BAS is due on the 21st day of the month after the period ends — a July BAS is due 21 August. Compare that to quarterly, where the September quarter is due 28 October, and self-lodgers who lodge online may get an extra two weeks on top of that. Monthly is a tighter clock, twelve times a year, with no online extension.
Second, it drags other things with it. If you claim fuel tax credits — and plenty of trade businesses with utes, plant and off-road equipment do — those move to monthly automatically as part of the change, along with wine equalisation tax and luxury car tax if they apply to you. You can also choose to align your PAYG withholding to monthly so that everything lands on one date.
Third, it sticks. If the ATO makes a determination, you must report monthly for a minimum of 12 months. To go back to quarterly you have to request that the determination be revoked, and the ATO will only approve that if it's satisfied the grounds no longer apply. In other words, you have to earn your way back.
Gold nugget. Whether the ATO moves you or you volunteer, the switch has a one-off cash cost almost nobody plans for, and it lands in the transition quarter. Under quarterly reporting, the GST you collect on a July invoice doesn't leave your account until 28 October, or mid-November if you get the online extension — roughly fifteen weeks of float. Under monthly, that same July GST is due 21 August. So in the quarter you change over, you can end up paying two or three months of GST inside a few weeks instead of one lump much later. It is not extra money, it is the same money earlier, but if you're running tight it will feel identical to a bill you didn't budget for. Pick a month you can absorb it, and put the number in your forecast before you flip the switch.
Why some owners are volunteering
Here's the part that surprises people. The ATO's own reported results from the campaign aren't a list of penalties collected. As at March 2026, roughly a third of the businesses moved had updated their registration details, and roughly half were lodging and paying on time. The ATO says many of them reported that monthly reporting made it easier to track their finances and business performance.
That tracks with what I see in trade businesses. A quarterly BAS is a large, infrequent, slightly abstract number that arrives long after the work that created it. By the time it lands, the money it represents has funded three months of wages, materials and a ute payment. A monthly BAS is a smaller, more frequent number that arrives while you can still remember the jobs. It behaves less like a tax bill and more like a rent payment.
The ATO's published example on that campaign page is a carpentry business with fourteen employees that had let its tax debt climb past $250,000, partly because irregular payments in construction made cash flow unpredictable and meeting large quarterly amounts all at once was crushing. After moving to monthly, smaller regular amounts were easier to stay on top of — and at the end of the twelve months, the business chose to keep reporting monthly.
You can make that choice yourself, without waiting to be told. Companies and trusts can change through Online services for business, under Profile then Tax registration; tax and BAS agents can do it in Online services for agents. Sole traders have to phone the ATO or apply in writing. The change takes effect from the start of the next quarter.
Who it suits, and who it doesn't
Monthly reporting suits you if your GST bill has repeatedly been the thing that ambushed you, if your bookkeeping is already current because you reconcile weekly anyway, or if you're on a payroll and PAYG withholding rhythm that's monthly already and the quarterly BAS is the odd one out.
It suits you less if your books are done in a panic the week before each BAS. Twelve panics a year is not an improvement on four. If that's you, the reporting cycle isn't the problem — the bookkeeping cadence is, and monthly reporting will simply expose that twelve times a year instead of four.
And it doesn't fix the underlying issue, which is almost always that the GST was spent before it was owed. The money you collect on an invoice was never yours. It sits in the trading account looking exactly like revenue until the day someone asks for it. Monthly reporting shortens the window in which you can accidentally spend it, which is genuinely useful, but the real fix is still moving the GST and PAYG withholding into a separate account the day the money lands. That, plus seeing the bill coming — a 13-week cash flow forecast puts every lodgment on the calendar weeks out, whether you lodge four times a year or twelve.
If you're already behind, the order of operations matters more than the cycle. Lodge on time even when you can't pay, because lodging and paying are separate obligations and silence closes doors — that's covered properly in what to do when you can't pay your BAS. Lodging late and often is also precisely the behaviour that gets you moved to monthly in the first place, so the two problems are the same problem.
What to do this month
The September quarter BAS is due 28 October. Between now and then, do three things. Check whether every BAS and income tax return for the last two years is actually lodged, because outstanding lodgments are the single clearest signal in the ATO's list. Ask your accountant whether monthly reporting would suit the way money moves through your business, and if the answer is yes, price in the transition-quarter cash hit before you commit. And open the second bank account, so that whichever cycle you're on, the GST is already sitting there when the date arrives.
If BAS day keeps arriving as a surprise, the reporting cycle isn't really the issue — it's that nothing in the business is telling you what's coming. That's one of the first things we pull apart in the Business Health Check: a fixed-price review of your numbers, your pricing and your cash cycle, with a written plan of what to fix first. Or start with the free 5-minute scorecard if you'd rather see where you stand before you talk to anyone.