Selling to Australian businesses and never heard of ABN? That's fine, most people building global SaaS haven't. But once you have an Australian business customer, they're going to ask for it on the invoice. And if you don't collect it during checkout, you're adding friction later.
Here's the short version:
What is an ABN?
ABN stands for "Australian Business Number". It's an 11-digit identifier issued by the Australian Business Register, and basically every business entity in Australia has one. It goes on invoices. Australian businesses use it to claim GST credits back, so your B2B customers will want to provide it.
Legally, businesses are required to include their ABN on invoices over AUD 82.50. For a SaaS subscription that's pretty much every invoice.
