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Getting Paid as a Supplier

Creating Valid Invoices

We understand the importance of a reliable cash flow for Australian businesses and the part we play in your businesses ability to grow, create new jobs and plan for the future. Providing a valid invoice to us will enable us to process and pay your invoice promptly.

Valid invoice

The Australian Taxation Office (ATO) website provides specific definitions of a valid tax invoice. Please ensure your invoice clearly displays the following pieces of information:


1. A valid tax invoice is required.

We will accept proforma invoices where appropriate.

a. Tax invoice: A bill of sale for goods/services provided.

b. Proforma invoice: A preliminary bill of sale in advance of the goods/services to be provided.


Invoice statements (a statement collating amounts owed) and quotes (a statement with an estimated cost for goods/services) will not be accepted.


2. Provide an invoice number and invoice date;

3. Your contact details.

This includes:

a. Your business name;

b. Business address- include your postal address if different from your business address;

c. Business contact details- contact number and E-mail address; and

d. ABN.

4. Payment details

This includes the account name, BSB and account number;

5. A description of the goods or services you have provided.

This includes the quantity, unit price, GST amount, and the total (inc/exc GST). Also include the Westpac cost centre for each item (this will help us direct your invoice to the correct business unit for payment); and

6. Depending on the payment platform you will be using, you will need to supply the following information:

WEAPS: Please request the following details from your Westpac contact and clearly mark this on your invoice or body of the e-mail you send to

If you are unable to supply all of this information, only the requestor is absolutely necessary:

  • Requestor:*
  • Cost Centre:
  • Approver:

Ebuy: Please ensure the PO (Payment Number) number is clearly marked on the invoice (If applicable).

Other: Please contact Supplier Advocacy for more information.