Vendor Master File

What is a vendor master file?

The vendor master file is the single source of truth your accounts payable team uses to decide who gets paid and where. It holds each supplier’s name, ABN, contact details, and, critically, their bank account. When an invoice is approved, the payment is directed to the account stored in this file, so the integrity of the file directly determines whether money reaches the real supplier.

A concrete example: a supplier emails asking to update their bank account in your records. A clerk edits the vendor master file, and from that point every future payment to that supplier flows to the new account. If the request was fraudulent, one edit quietly redirects an ongoing stream of payments.

Why it matters for Australian finance teams

The vendor master file is a high-value target precisely because a single change affects many payments. Common risks include ghost or shell vendors added for fake invoices, and unverified bank detail changes that route legitimate invoices to a fraudster. For mid-market and enterprise finance teams processing high volumes, weak controls over master data are a leading cause of payment redirection losses reported to the ACCC’s Scamwatch.

How ezyshield helps

ezyshield verifies a supplier before it is trusted in your file: the business via ABN and ASIC records, the person acting for it, and ownership of the nominated bank account. When those bank details change, ezyshield re-verifies rather than accepting the update on trust, and logs every check to an append-only audit trail that is never edited or deleted. See how it works and our guide to supplier verification in Australia. ezyshield is not a full vendor management system; it is the verification layer around the details that move money.