Can I invoice without an ABN in Australia?

Yes. Nothing makes it illegal to send someone an invoice without an ABN on it. What happens next is the problem: where a business pays another business for goods or services and no ABN is quoted, the payer generally has to withhold tax from the payment at the top rate and send it to the ATO. You’d still get the invoice paid, just not all of it, and you’d be waiting until you lodge a tax return to see the rest.

There are exceptions, and they’re narrower than most people assume. For anyone running an ongoing business, the practical answer is to get an ABN before the first invoice goes out.

General information, not tax advice. The ATO is the authority - see ato.gov.au or ask a registered tax or BAS agent.

The no-ABN withholding rule

The rule sits with the payer, not with you. The ATO’s withholding from suppliers guidance is that if a business supplies goods or services and doesn’t quote an ABN, the payer generally withholds the top rate of tax from the payment and sends the withheld amount to the ATO. The trigger is a total payment of more than $75, excluding GST, per the ATO’s page on withholding if an ABN is not provided. That page describes the amount as the top rate of tax without naming a percentage; the ATO’s statement by a supplier page puts the figure at 47%.

Two things follow from that. The withheld amount isn’t lost - it’s credited against your income tax when you lodge - but it’s gone from your bank account for the rest of the financial year, which for a small business is exactly the money that pays for materials and rent in the meantime.

The second is more mundane and happens more often. Plenty of accounts departments don’t want to administer a withholding at all. Faced with an invoice that has no ABN, they park it and ask a question, and the invoice that would have been paid in fourteen days is still sitting there in six weeks.

Note that the rule bites on business-to-business payments. A private individual paying you to mow their lawn isn’t withholding anything from anyone.

The exceptions

The ATO lists a set of payments you don’t withhold from, on its payments you don’t withhold from page. The two that come up most:

The payment is $75 or less, excluding GST. Below that, the payer doesn’t need an invoice quoting an ABN and doesn’t withhold. The ATO is explicit that a larger supply can’t be broken into a series of sub-$75 amounts to get around this.

The supply is part of a private recreational pursuit or hobby. The ATO’s own example is buying a picture from an artist who paints as a hobby. There’s a related exclusion for goods that are wholly of a private or domestic nature, such as a second-hand item that has only ever been used privately at home and isn’t trading stock or business equipment.

Where one of these applies, the payer needs something on file to show why they didn’t withhold. That document is the Statement by a supplier not quoting an ABN, a short form on the ATO site (NAT 3346) in which the supplier states the reason. A supplier can write their own statement carrying the same information, and it can sit on the invoice itself. On the same payments you don’t withhold from page, the ATO says the payer keeps any statement they receive for 5 years, and that a payer with reason to believe the statement is false or misleading has to withhold the top rate anyway.

That form is a real answer for a genuine one-off - selling a used piece of equipment, a hobby sale. It’s not a workaround for running a business without an ABN. Signing a statement that the supply is a hobby when it’s a business is a false statement, not a paperwork shortcut.

Why most sole traders are better off with one

An ABN is an 11-digit number that identifies your business to government and to the community, per the ABR. It isn’t a tax registration in itself, and holding one doesn’t oblige you to register for GST.

What it does is remove friction. Invoices go straight through accounts payable. Customers can look you up on ABN Lookup and see the name matches. You can register for GST later without a separate identity step. If you decide to trade through a company instead, the company gets its own ABN alongside its ACN, and the difference between those two paths is worth thinking about before you incorporate rather than after - sole trader or company structure covers the trade-offs.

The one caveat the ABR is firm about: not everyone is entitled to an ABN. It’s for entities carrying on or starting an enterprise in Australia, entities making supplies connected with Australia’s indirect tax zone, and Corporations Act companies. The ABR’s ABN entitlement page says you may face prosecution or criminal charges if you apply for an ABN, register for GST and claim GST refunds when you’re not entitled, and that you may be subject to an entitlement review at any time.

Applying for one

Applications go through the Australian Business Register at abr.gov.au. Having your tax file number to hand makes the application faster, since the ABR can identify you from it. The application also asks for proof of identity, the date you started or will start the enterprise, and a description of your main business activity. Sole traders apply as an individual; if you’re setting up a company, the company is the applicant.

A successful application returns your 11-digit ABN and you can go straight on to other registrations such as GST. An unsuccessful one returns a refusal number, with a letter within 14 days setting out the reasons and your review rights. If the ABR needs to look at the application manually, it aims to review it within 20 business days and will contact you if it needs more, so it’s worth applying before you need it rather than the afternoon an invoice is due.

What goes on the invoice once you have it

Put the ABN in the header block, under your business name, on every document you send: quotes, invoices, and receipts. Write out all 11 digits, and use the spacing the ABR itself uses on your confirmation so that anyone checking it against ABN Lookup sees the same thing.

Everything else about the invoice is unchanged, and it’s covered in how to invoice as a sole trader: a unique number, an issue date, a specific due date, a description a stranger can approve, and bank details with the reference you want used. If you’re registered for GST, the document also becomes a tax invoice with its own required fields.

How Apsis helps

Apsis keeps your ABN, trading name and contact details in one place and prints them on every quote and invoice, so the field that stalls invoices in accounts payable is filled in by default rather than by memory. Setting it up is a one-off: you enter the ABN once when you set up your business details, and every document issued afterwards carries it. Quotes and invoices are on the free plan, which covers 5 clients and 20 invoices a month, and they share the same client list, so the details on an approved quote carry through to the invoice without retyping.