ABN Invoicing Guide (Australia)
In Australia, your ABN (Australian Business Number) is the key identifier on every invoice you issue. Combined with GST rules and PAYG withholding requirements, there is a specific checklist to follow. This guide covers it for sole traders and small businesses.
Getting and Showing Your ABN
Apply for an ABN through the Australian Business Register — it is free and you are entitled to one if you are carrying on an enterprise in Australia. Once issued, your ABN must appear on all invoices. You can verify anyone's ABN (including your clients') on the public ABN Lookup service.
If you quote or invoice without an ABN, payers are generally required to withhold 47% from payments to you under the PAYG withholding 'no ABN' rules. Getting an ABN before your first invoice is one of the highest-value admin tasks for a new Australian business.
Tax Invoices and GST
If you are registered for GST (mandatory at $75,000 annual turnover, $150,000 for non-profits), invoices for taxable sales of $82.50 or more including GST must be tax invoices: showing your name and ABN, the date, a description, the GST-inclusive total, and a statement that the total includes GST. Sales over $1,000 need the buyer's details and GST per line item.
Australian prices are quoted GST-inclusive by convention. If you are not GST-registered, do not show GST on invoices — and note that you cannot claim GST credits on your purchases either.
PAYG Withholding: When Payers Deduct Tax
Two withholding situations matter for invoicing. First, if you do not quote your ABN, the payer must withhold at the top marginal rate — always quote it. Second, under voluntary agreements or labour-hire arrangements, different withholding rules can apply; these are agreed between parties rather than automatic.
Amounts withheld are credited against your tax at return time and appear on your payment summaries. Keep records of any withholding so your tax return claims the full credit.
Sole Trader Essentials
As a sole trader you trade under your own name or a registered business name (register it with ASIC if it differs from your name). Your invoices do not need an ACN — that is for companies — but your ABN is mandatory. Income is reported in your individual tax return with a business schedule.
Set aside tax as you earn: unlike employees, no one withholds for you (except the no-ABN case). Many sole traders transfer a percentage of each paid invoice to a separate savings account so tax time never brings a shock.
Frequently asked questions
What happens if I invoice without quoting my ABN?
The payer must generally withhold 47% of the payment and send it to the ATO. You get it credited back at tax time, but your cash flow takes a major hit — always quote your ABN on quotes and invoices.
Do I need to register for GST as a sole trader?
Only when your annual GST turnover reaches $75,000 ($150,000 for non-profits). Below that it is optional. Taxi and ride-share drivers must register regardless of turnover.
How long must I keep invoice records in Australia?
Generally five years after the records were prepared or the transaction completed, whichever is later. The ATO accepts digital records, so scanned invoices stored with backups are fine.
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