GST registration in Australia: when, how and what changes

When GST registration is compulsory

The trigger is GST turnover, broadly your gross business income minus GST itself and a handful of exclusions such as input taxed sales. The ATO tests it two ways. Look back over the current month plus the previous eleven, then look forward over the current month plus the next eleven; cross $75,000 on either measure and you're required to register, even if your financial year total sits comfortably under it.

It's the forward test that catches growing businesses off guard. Sign a contract that will clearly push you past the threshold over the next year, and the obligation can land before you've banked a cent of it. A handful of activities require registration regardless of turnover, taxi and ride sourcing services being the main example. The ATO lists the special cases, and a registered agent can usually tell you in five minutes whether any apply to you.

• Your rolling twelve month turnover hits $75,000, or $150,000 for not-for-profits
• Your projected turnover for the next twelve months will reach the threshold
• You provide taxi or ride sourcing services, where registration applies from dollar one
• You want to claim fuel tax credits, which isn't possible without GST registration

How to register

An ABN comes first, before anything else. From there, registration happens through the ATO's online services, through the same form used for the ABN application, or by having your tax or BAS agent lodge it for you. Two choices travel with it, a reporting cycle and an accounting basis, and both matter more than the dropdown menu makes them look.

Most small businesses end up on quarterly reporting and cash basis accounting, meaning GST is recognised when the money actually moves rather than when the invoice goes out. Cash basis tends to suit anyone paid after invoicing, since you're not left funding GST on sales you haven't collected yet. Accruals can suit other models better. Either way, it's a conversation worth having with your accountant or bookkeeper before you lock it in.

What changes once you are registered

From your registration date, every taxable sale carries ten per cent GST, and your invoices need to meet the tax invoice rules: your ABN shown, the GST amount clear. The upside is you can claim back the GST on most of what you buy for the business, which softens the blow considerably.

Then there's the BAS, lodged each cycle. Quarterly lodgers work to fixed dates every year, and they don't move.

A registered tax or BAS agent can often extend some of these dates. Monthly reporters don't get that luxury: they lodge by the 21st of the following month, full stop.

Registering voluntarily

Nothing stops you registering below the threshold, and sometimes it's the smarter move. It suits businesses whose customers are mostly GST registered and will claim the credit back anyway, or anyone mid investment phase wanting to recover GST on big purchases. It makes far less sense selling to the public, since registering effectively adds ten per cent to your prices or eats ten per cent of your margin. Weigh the admin and cash flow cost against what you'd actually claim back before deciding either way.

Where NextEra fits

Getting registration right is the easy part. Running clean GST coding week after week is where most businesses drift. NextEra's managed monthly bookkeeping keeps sales and purchases coded properly so every BAS is right the first time, and a Strategic Finance Review is a sensible place to start if you're approaching the threshold and want it sorted before it turns urgent.