What Does an Invoice Need?

An invoice needs enough detail for the client to identify the charge, pay it on time, and reference it later — and for both parties to keep accurate tax records. Missing fields are the most common reason invoices get delayed.

Every invoice needs:

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 of issue
The client's name and billing address
Description of each item or service with quantity, unit price, and line total
Subtotal, any GST or tax, and the total amount payable
Payment due date and payment methods (bank, BPAY, PayID)
Optional: PO number, project reference, or a thank-you message

For Australian tax invoices of $1,000 or more, you also need the buyer's identity or ABN. Without an ABN on the invoice, the client may have to withhold 47% under the No-ABN Withholding rule. Always send invoices as PDFs to lock in formatting. InvoiceSonic's templates pre-fill every required field automatically.

What Does an Invoice Need?

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