Understanding Account Numbers in Australia (2025 Guide)

Account numbers—those seemingly random strings of digits—are at the heart of every Australian’s financial life. Whether you’re transferring money, getting paid, or setting up a new bank account, these numbers quietly power almost every transaction. But with digital banking and new security regulations on the rise in 2025, understanding your account number is more important than ever.

What Is an Account Number and How Does It Work?

In Australia, your account number is a unique identifier assigned to your bank account. Paired with the BSB (Bank State Branch) code, it ensures money lands in the right spot. Most account numbers are 6–9 digits and are specific to your bank and account type.

• BSB + Account Number: Both are needed for most transfers, including Osko and PayID payments.
• Multiple Accounts, Multiple Numbers: Each account (savings, credit, mortgage offset, etc.) has its own number—even within the same bank.
• International Transfers: For overseas payments, your account number may be paired with a SWIFT/BIC code or IBAN (for incoming funds).

Every time you pay a bill, receive your salary, or transfer to a mate, your account number is working behind the scenes to route the funds correctly.

2025 Updates: Open Banking, PayID, and Account Security

This year has brought several changes that impact how Australians use and protect their account numbers:

• Open Banking Expansion: As of March 2025, all major banks must allow customers to securely share account data with accredited third parties. This means you can connect budgeting apps or switch banks more easily—but also need to be careful about where your details go.
• PayID Proliferation: More Aussies are using PayID (like a phone number or email) instead of sharing their account number for payments. However, account numbers are still essential for direct deposits, business transactions, and certain government payments.
• Stronger Anti-Fraud Measures: In response to a rise in scams, banks now use real-time account name verification and dynamic alerts when you set up a new payee, making it harder for criminals to steal your funds with a misdirected account number.

For example, if you’re setting up a new supplier or getting paid for freelance work, most business banking apps now prompt you to double-check the account holder’s name before sending money—helping reduce costly mistakes and fraud.

How to Safeguard Your Account Number (and Why It Matters)

While your account number alone can’t unlock your funds, it is a key target for scammers. Here’s how to keep your details safe in 2025:

• Never share your account number on public forums or social media.
• Always verify the recipient’s details—especially for large or first-time payments.
• Enable notifications for incoming and outgoing payments through your banking app.
• Be wary of phishing emails or texts asking for your account or BSB number; always contact your bank directly if unsure.

Remember: if someone gains access to both your account number and additional personal information (like your driver’s licence or Medicare number), they could attempt identity theft or social engineering attacks.

Real-World Example: Switching Banks in 2025

Suppose you’re one of the 1.2 million Australians who switched banks in the past year, chasing better rates or digital features. With open banking, you can now port your transaction history and set up new direct debits faster. However, your new account number will be different, so you’ll need to update employers, Centrelink, and any recurring payment providers. Some banks now offer automated switching services, but always double-check that all your payments are routed to the right place.

The Bottom Line

Account numbers are the silent workhorses of the financial system. As banking gets smarter and more connected in 2025, knowing how to use and protect your account number is essential. Stay vigilant, embrace new security tools, and make sure your money always lands where it should.