GST Invoice Checklist for Australian Small Businesses

• Tax
• Small Business
• Accounting

If your Australian business is registered for GST, your invoices need to do more than request payment. They also need to support your GST records and make your Business Activity Statement (BAS) easier to prepare.

This checklist gives you a practical way to review GST invoices before you send them. It is general information only, so check the ATO GST guidance or speak with a registered tax or BAS agent if you are unsure.

A clean GST invoice helps your customer understand what they owe, helps your records stay tidy, and reduces the chance of BAS errors later.

1. Check Whether You Are Registered for GST

The ATO explains that GST is a broad-based 10% tax on most goods, services and other items sold or consumed in Australia. Businesses registered for GST generally include GST in taxable sales, claim GST credits on business purchases, and report GST through activity statements.

If you are not registered for GST, your invoices should not say “tax invoice”. If you are registered for GST, your invoices for taxable sales should generally be treated as tax invoices. The ATO’s setting up your business invoices page explains this distinction.

For a plain-English explanation, see the GST glossary.

2. Include the Core Invoice Details

For everyday GST invoicing, check that the invoice includes:

• your business name
• your ABN
• the invoice issue date
• a clear invoice number
• the customer’s details
• a description of the goods or services
• quantity, price and total amount
• GST amount or a clear GST-inclusive statement where appropriate
• payment terms and due date

The ATO’s tax invoice guidance explains what tax invoices need to include and how requirements can vary depending on the sale amount and sale type.

In Gimbla, the create an invoice guide shows where to enter customer, date, item, tax and payment information.

3. Use the Correct Tax Treatment

Not every sale has the same GST treatment. Some sales are taxable, some are GST-free, and some may be outside the GST rules.

Before sending the invoice, ask:

• Is the business registered for GST?
• Is the sale taxable?
• Is the customer being charged the correct tax rate?
• Are GST-free or non-taxable items separated clearly?
• Does the total match the supporting agreement, quote or order?

If you sell a mix of taxable and GST-free items, clear line items matter. They make the invoice easier for your customer to understand and easier for you to review later.

4. Keep Records That Support Your BAS

GST invoices are part of your BAS evidence. The ATO’s GST records guidance says businesses need records that show the income and expenses used to calculate GST amounts and GST credits.

For each reporting period, make sure you can support:

• sales invoices issued
• customer payments received
• supplier bills and tax invoices
• GST collected on sales
• GST paid on purchases
• adjustments, credit notes and refunds

When you are ready to clear the GST liability in Gimbla, follow the GST, VAT and Sales Tax guide.

5. Avoid Common GST Invoice Mistakes

Small invoice errors can create bigger clean-up work later. Watch for:

Calling It a Tax Invoice When You Are Not Registered

If your business is not registered for GST, do not label the document as a tax invoice and do not charge GST.

Forgetting the ABN

Your ABN is a key identifier on Australian business invoices. If supplier ABN issues come up, our ABN withholding rate guide explains the related withholding concept.

Counting an Invoice Twice

Duplicate invoices can overstate revenue and GST. Keep invoice numbers consistent and avoid re-entering the same customer sale.

Using the Wrong GST Account

When you lodge and pay GST, the payment should clear the tax liability account rather than being coded to a normal expense. The GST, VAT and Sales Tax guide covers that workflow.

Forgetting Credit Notes

If a customer return or discount reduces the amount owed, record a credit note. This keeps accounts receivable, sales and GST records aligned.

GST Invoice Checklist

Before sending a GST invoice, confirm:

Check	Done
Business is registered for GST if issuing a tax invoice
Business name and ABN are shown
Invoice date and invoice number are clear
Customer details are correct
Line items describe what was sold
GST treatment is correct for each line
Total amount is correct
Due date and payment instructions are included
Supporting records are saved for BAS review

Final Thought

GST invoicing is much easier when each invoice is clear at the point of sale. Get the customer details, tax treatment and payment terms right before sending. Then reconcile payments regularly so your BAS preparation is based on clean records rather than guesswork.