What Does an Invoice Need to Include?

An invoice needs to include every detail the client needs to identify the charge and pay it — plus the information you need for your own bookkeeping and tax reporting.

A complete invoice includes:

The word "Invoice" or "Tax Invoice" (if you're GST registered)
Your business name, ABN, and contact details
A unique sequential invoice number
The date the invoice was issued
The client's name and billing address
A line-by-line description of products or services with quantity, rate, and line total
Subtotal, any GST or tax, and the grand total
Payment due date and accepted payment methods
Bank, BPAY, or PayID details for payment
Optional: PO number, project reference, or thank-you message

For Australian tax invoices of $1,000 or more, also include the buyer's identity or ABN. Save invoices as PDFs before sending — PDFs lock in formatting and look professional on any device. Keep copies for at least five years to meet ATO record-keeping rules. InvoiceSonic's templates pre-fill every required field by default.

What Does an Invoice Need to Include?

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