Invoicing and GST, explained without the jargon.
Short, practical guides for Australian owner-operators. Every rule here is checked against the ATO and linked back to the source, so you can see where it comes from.
What has to be on an Australian tax invoice
Seven required fields, what changes above $1,000, and why a missing ABN costs your customer their GST credit.
Read the guide →How to calculate GST in Australia
Multiply by 1.1 to add it, divide by 11 to find it. Worked examples, mixed invoices and rounding.
Read the guide →Do you need an ABN on an invoice?
Leave the ABN off and your customer is required to withhold 47% of the bill. Here is when it applies.
Read the guide →Quote vs estimate: which one should you send?
One is a fixed price you are bound to, the other is a best guess. Sending the wrong one costs money.
Read the guide →How to chase a late invoice without losing the customer
Terms that prevent it, a reminder sequence that works, and what a letter of demand needs.
Read the guide →BAS checklist for small trade businesses
Quarterly due dates, what to reconcile before you lodge, and the records that make it quick.
Read the guide →Or stop doing it by hand.
JASC builds compliant tax invoices from your quotes: your ABN and business details on every one, GST applied per line item at 10%, totals kept in cents so your BAS figures reconcile. Free for 30 days on the desktop app.