You can customise your invoice template, bigdogautopd-gma.
Note that this will only affect invoices created moving forward. Follow the steps below:
- Click the Gear icon.
- Select Custom form styles.
- Click Edit on the invoice format.
- Select Content.
- Click the header, then check the box for ABN.
- Enter your ABN.
- Click Done to save changes.
That's it! Your Australian Business Number will now appear on your invoices. You can also customise other sales forms in QuickBooks: Customise invoices, quotes, and sales receipts in QuickBooks Online.
Let me know if you need anything else, I'll be more than willing to help.