Australian BSB Validation

Professional Australian BSB Validation

IbanVerify delivers enterprise-grade Bank-State-Branch (BSB) validation trusted by Australian financial institutions, payroll teams, and payment platforms nationwide. Our service is built on a continuously refreshed database of all registered BSB numbers drawn directly from the Australian Payments Network (AusPayNet) directory, ensuring every domestic payment you process is routed to the correct bank and branch with complete accuracy.

Data Quality & Accuracy

Our BSB data is sourced from the official AusPayNet BSB Directory, the authoritative register maintained by Australia's payments industry. We synchronise updates on a regular cadence to capture newly issued, merged, or decommissioned codes as they occur.

Best Practice: For direct debit initiators and payroll processors, validate BSBs at the point of bank-account capture to prevent DISHONOUR returns and reduce investigation costs downstream.

Understanding the BSB Number

The Bank-State-Branch (BSB) number is a six-digit code that lies at the heart of every Australian domestic payment. Introduced in the 1960s, it remains the primary routing mechanism for the Direct Entry (DE) system used by the New Payments Platform (NPP), BECS direct debits, and real-time PayID-linked transfers.

Six-Digit Structure

A BSB is formatted as XXX-XXX: the first two digits identify the financial institution, the third digit indicates the state or territory, and the final three digits pinpoint the individual branch. This layered structure means every branch in Australia has its own unique six-digit address within the payment network.

All Australian Institutions

IbanVerify covers BSB codes for the Big Four banks (ANZ, CBA, NAB, Westpac), regional banks, credit unions, building societies, and non-bank payment institutions — every ADI registered with APRA that participates in the Australian payments system.

Why Businesses Rely on BSB Validation

Incorrect BSBs cause DISHONOUR returns, BECS-error notifications, and manual investigation costs that erode both profit margins and customer trust. IbanVerify's BSB validation prevents these outcomes by providing:

Pre-Payment Accuracy — Verify BSBs before submitting direct-entry files or NPP payments, eliminating returns and avoiding AusPayNet error penalties
Complete Branch Intelligence — Access institution name, branch description, and BIC/SWIFT code alongside every validated BSB for thorough due diligence
Payroll & HR Integration — Validate bank details at employee onboarding to catch typos before the first payroll run, saving costly corrections
Real-Time Fraud Screening — Flag decommissioned or non-existent BSBs instantly, detecting fraudulent payee records before funds leave your account
Regulatory Confidence — Support your AFSL or ADI compliance obligations by maintaining auditable pre-transaction verification records
Lower Operational Costs — Reduce manual bank-detail verification, customer support calls, and DISHONOUR return fees with automated, always-on validation

Enterprise Validation Infrastructure

AusPayNet Sourced

Official BSB directory, synchronised directly from AusPayNet records

Instant Results

Sub-200 ms validation response times with 99.9% uptime SLA

Full Branch Detail

Bank name, branch description, BIC code, and payment-network status returned instantly

How to Validate a BSB Number

Enter the BSB — Type or paste the 6-digit BSB (with or without the hyphen) into the validator above.
Instant Verification — IbanVerify queries the AusPayNet-sourced registry and returns results in milliseconds.
Review Branch Details — View the institution name, branch description, and BIC code alongside the validation status.
Process with Confidence — Proceed with your payment or onboarding step knowing the BSB has been verified against current AusPayNet records.

For Payroll & Finance Teams

Integrate IbanVerify's BSB API into your payroll system, accounts-payable workflow, or customer onboarding form for real-time validation at scale.

View Enterprise Plans

Developer Resources

Explore REST API docs, code samples, and a sandbox environment to integrate BSB validation into your application in minutes.

API Documentation

Trusted by Australian Businesses

IbanVerify powers BSB validation for payroll processors, fintech platforms, and corporate finance teams across Australia. Our validation services process thousands of BSB lookups daily, maintaining a 99.97% accuracy rate and industry-leading uptime. From startup to enterprise, IbanVerify is the trusted foundation for accurate Australian domestic payments.