What Is a Invoice?

An invoice is a document that a business sends to a customer to request payment for goods or services. It records what was supplied, the agreed price, and how to pay. Invoices are the basis of small business accounting and are essential for tax records, BAS lodgements, and proof of income.

A standard invoice contains:

  • Your business name, ABN, and contact details
  • A unique invoice number and the issue date
  • The customer's name and billing address
  • Itemised list of products or services with quantity and price
  • Subtotal, GST (if applicable), and total amount due
  • Payment terms and payment methods
  • Bank details, BPAY, or PayID for fast payment

In Australia, businesses registered for GST must issue "tax invoices" for sales over $82.50 (GST inclusive). The buyer needs the tax invoice to claim a GST input tax credit. Always send invoices as PDFs to lock in formatting. InvoiceSonic's free generator creates professional, ATO-compliant invoices in under two minutes.

Ready to create your first invoice? Use InvoiceSonic's free invoice generator and get a professional PDF in under 2 minutes.

Create Free Invoice