Yes, you can legally issue an invoice without an ABN in Australia. There is no law forcing you to have an ABN to send someone a bill or get paid. However, the catch is what the person paying you must do: if you are running a business (an "enterprise") and the supply is worth more than $75 excluding GST, the payer is required by ATO "no ABN withholding" rules to withhold 47% of the payment and send it to the ATO, unless you either quote an ABN or hand them a completed "Statement by a supplier" form.
So while invoicing without an ABN is allowed, it can be expensive. Below is how it actually works.
The $75 rule and the 47% withholding:
Hobby vs enterprise (this is the key distinction):
The Statement by a Supplier form:
If you genuinely do not need an ABN, you can give the payer a completed "Statement by a supplier" form (free from the ATO). It lets them pay you in full without withholding 47%. Valid reasons to use it include:
If you are actually operating a business, you are not entitled to use this form. The honest fix is simply to apply for an ABN.
Getting a free ABN:
An ABN is completely free. Apply directly through the Australian Business Register at abr.gov.au. Avoid third party sites that charge a fee, as the official application costs nothing. Approval is often instant if your details are in order.
Important limits without an ABN:
With InvoiceSonic you can create a clean, professional, compliant invoice in seconds, with or without an ABN. Add your ABN when you have one (and switch it to a Tax Invoice if you are GST registered), or send a plain invoice now if you are a hobbyist or just starting out.
This is general information only and not tax or legal advice. For your specific situation, check ato.gov.au or speak to a registered tax agent.
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