When to Register for GST: A Tradie's Checklist
11 September 2026 · By Heaney Accounting
Many tradies start their business as a sole trader and forget to monitor their total turnover until it is too late. The Australian Taxation Office requires you to register for GST once your annual gross income reaches $75,000. It is critical to note that this is based on your total income, not your profit, meaning your material costs and expenses are included in this threshold calculation.
If you are approaching this $75,000 limit, you need to prepare your systems immediately. Once registered, you must add 10% GST to your invoices and lodge your Business Activity Statements on time. Failing to register when required can lead to back-dated GST liabilities, which means you have to pay the tax out of your own pocket since you didn't charge your clients for it.
You should also consider the benefits of voluntary registration even if you haven't hit the threshold yet. If you are doing a lot of work for other businesses, they often prefer dealing with GST-registered contractors, and you can claim back the GST you pay on your expensive trade tools and vehicle purchases. This can provide a significant boost to your starting cash flow if you are reinvesting heavily in your business.
Take the time to review your bookkeeping data at the end of every single month to see where your rolling 12-month turnover sits. If you see yourself trending toward that $75,000 mark, speak to your accountant early so you can adjust your quoting strategy. Being prepared allows you to seamlessly transition your pricing without shocking your regular clients or creating a messy tax situation for your business.
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