Invoicing Basics for Australian Sole Traders

Your invoice is your request to be paid and your proof of income at tax time. Getting the details right is not hard, but Australia has a few specific rules — around your ABN and GST — that trip people up. Here is the plain-English version.

By Allen Mitchell — founder, ZillaKit · Published July 2026

Disclaimer: This is general information to help you understand the basics, not tax or legal advice. Rules and thresholds change. Always check the current guidance on the Australian Taxation Office site at ato.gov.au, or speak to a registered tax agent about your situation.

What a valid Australian invoice needs

At a minimum, a standard (non-GST) invoice should clearly show that it is an invoice, and include:

The ABN matters more than people realise. If you supply goods or services to another business and you do not quote an ABN on your invoice, the paying business may be required to withhold 47% of the payment under the "no-ABN withholding" rule and send it to the ATO. In practice that means no ABN can mean you get paid roughly half. So even as a small operator, get an ABN (it is free) and put it on every invoice.

GST and the $75,000 threshold

Goods and Services Tax (GST) is a 10% tax on most sales. The rule that decides whether it applies to you is the registration threshold: you must register for GST once your business turnover reaches $75,000 or more in a 12-month period (the threshold is $150,000 for non-profits, and taxi/rideshare drivers must register regardless of turnover). Below $75,000 registration is optional.

This has real consequences for your invoices:

A common judgement call: should you register voluntarily before you hit $75k? If your customers are businesses that claim GST back, it makes little difference to them and lets you reclaim GST on your own costs. If your customers are the general public, adding 10% can make you look more expensive than an unregistered competitor. Weigh it up for your market.

Tax invoices and the $82.50 rule

Once you are registered for GST, the document has extra requirements and is called a tax invoice. For any sale of $82.50 or more (including GST), your customer can ask for a tax invoice, and you must provide one within 28 days. A valid tax invoice must show:

For sales of $1,000 or more, the tax invoice must also show the buyer's identity or ABN. The $82.50 figure is simply $75 plus 10% GST — it is the point at which a formal tax invoice can be demanded. Below it, a simpler receipt is fine.

Quote vs invoice vs receipt

These three documents get muddled constantly, but they mark different moments in a job:

You can build all three, correctly formatted for Australian requirements, with ZillaKit's business tools: the Invoice Generator handles line items, GST and payment terms; the Quote & Estimate Generator lets you label the document and set a validity period and deposit line; and the Receipt Generator issues clean receipts once you are paid. Everything is assembled into a PDF in your browser — your client names, rates and ABN are never uploaded anywhere.

Getting paid faster

A correct invoice is only half the job; getting the money in is the other half. A few things genuinely move the needle:

If you invoice for time, the Timesheet Generator turns your hours into defensible figures you can attach, and for larger operations purchase orders keep supplier arrangements straight. The full set lives on the business tools hub.

None of this is complicated once you have done it a few times: get an ABN and put it on everything, know whether the $75k threshold applies to you, use "Tax invoice" only when you are GST-registered, and make it easy and quick for people to pay. For anything specific to your circumstances, the ATO at ato.gov.au is the authority — this guide just gets you oriented.

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