How to Create an Invoice in Australia

1. Start with the accepted work

Before opening an invoice template, check what the customer actually accepted. Use the quote, purchase order, scope of work, timesheet and approved variations as the source of truth. Confirm the customer’s legal or business name, billing email and any reference they require.

This first step prevents the most common payment delay: an invoice that does not match the customer’s understanding of the job. Resolve scope or price disagreements before the invoice is issued rather than trying to explain them inside the invoice.

2. Decide whether it is an invoice or tax invoice

A GST-registered business generally uses the title “tax invoice” for taxable sales. A business that is not registered for GST uses a regular invoice and should not charge GST.

Do not use the customer’s GST status to decide the document type. The supplier’s GST registration and the nature of the sale are the important starting points. If the transaction includes taxable and non-taxable items, show the treatment clearly and check the current ATO rules.

3. Assign the invoice number and dates

Give the document a unique invoice number and an issue date. A stable sequence such as INV-0001 is easier to reconcile than random numbers. Add the due date as a full calendar date so there is no argument about when “14 days” begins or ends.

If the invoice replaces an incorrect document, preserve the history. Do not silently edit the old PDF and reuse it. Keep a note of the correction and issue a clearly identified replacement where needed.

4. Add supplier and customer details

Include the supplier’s business name, contact information and ABN where applicable. For tax invoices, the ATO requires specific supplier details, and invoices of $1,000 or more also need the buyer’s identity or ABN.

Use the billing entity provided by the customer rather than assuming the person who booked the work is the entity that will pay. Add a purchase-order number, project code, site address or contact name when the customer’s accounts process depends on it.

5. Build clear line items

Each line should explain what was supplied and how the amount was calculated. Include quantities, hours, units and rates when they help the customer verify the charge. Separate labour, materials, travel, approved variations and reimbursable expenses instead of combining everything into one unexplained total.

Use plain language. Internal abbreviations may make sense to the supplier but not to the customer’s accounts team. If the invoice covers a date range, show that range either in the description or notes.

6. Calculate subtotal, GST and total

Add the line totals to calculate the subtotal. If GST applies, show the amount in the way required for the transaction and make it clear whether displayed prices include or exclude GST. Then show the final amount due.

Do not assume every sale made by a GST-registered business is fully taxable. GST-free or input-taxed items can require different treatment. The invoice tool can calculate numbers from the settings entered, but it cannot decide the legal GST status of the sale.

7. State payment methods and terms

Tell the customer exactly how to pay and when payment is due. Bank transfer instructions should include the account name, BSB, account number and the payment reference you want used. Other payment methods may involve fees or settlement delays, so make those arrangements clear before invoicing.

Payment terms form part of the commercial agreement. They can include deposits, payment on completion, staged claims or credit terms such as 7, 14 or 30 days. Repeating them on the invoice reduces uncertainty but does not replace agreeing them with the customer.

8. Review the invoice before sending

Check the customer name, invoice number, dates, bank details, line items, GST and total. Preview the PDF to ensure the page is readable and no fields are cut off. A professional invoice should be easy to understand on a phone because many customers approve payments from mobile devices.

Send the invoice promptly after the agreed billing event. Use a subject line that includes the invoice number and business name, and keep the sent email or share record.

9. Record payment and follow up

Mark the invoice paid when the money actually clears and record the payment date. If payment is late, begin with a polite reminder that includes the invoice number, amount and original due date. Keep a record of reminders and any revised arrangement.

Clear descriptions and payment terms reduce disputes, but they do not guarantee payment. For persistent non-payment, consider the size of the debt, the written agreement and the cost of further recovery before escalating.

10. Keep the final records

Australian businesses generally need to keep most tax-related business records for at least five years, although some records can require longer retention. Keep the final invoice, related quote, variations, receipts, timesheets and proof of payment together.

Browser storage can be cleared or lost. If an invoice app stores data locally, download backups regularly and retain final PDFs outside the browser. A record that exists on only one phone is not a reliable business archive.

Example: turning a quote into an invoice

Assume a sole trader quoted $1,200 plus GST to complete a repair, with a 20% deposit and the balance due on completion. The quote should record the scope, deposit amount and completion trigger. After acceptance, the first invoice requests the deposit and references the quote number. Once the job is finished, the final invoice lists the full contract amount, subtracts the deposit already paid and shows the remaining balance.

If the customer approves an extra $180 plus GST during the job, show that variation separately and retain the approval. This is clearer than changing the original quoted line to $1,380 without explanation. The customer can then reconcile the accepted quote, deposit, variation and final payment.

When a simple invoice app is no longer enough

A focused invoice app suits straightforward work where the business mainly needs quotes, invoices, customers, expenses and basic reports. Move to full accounting software when the business needs bank feeds, payroll, inventory, recurring billing, multi-user access, BAS workflows, accountant access or automatic reconciliation.

Do not keep a lightweight tool merely to avoid change if it creates duplicate data entry or weakens records. The right system is the one that reliably captures the business process at its current size. Export clean records before migrating and keep the old archive accessible.

Official sources and review notes

This guide summarises general Australian invoicing practice. Check the current rules against the original sources when the invoice affects GST reporting, a contract dispute or a material amount of money.

• business.gov.au: How to invoice
• ATO: Setting up your business invoices
• ATO: Tax invoices
• business.gov.au: Payment terms