No captchas. No wait times. Just the data you need for your workpapers.
Real ABNs with interesting historical changes. Click to test the historical lookup feature.
💡 Pro Tip
These examples show why historical lookups matter for BAS compliance and audit trails.
Checking more than 10 ABNs? Try our Bulk Watchlist & Automation Tool →
Example: 51 824 753 556 or 51824753556
0 ABNs verified this month
ABN:
Status as at:
Entity Type
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Location
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GST From Date
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GST Registration Cancelled
Verify before claiming GST credits
Data sourced from Australian Business Register (ABR). Information cached for 24 hours for optimum performance.
Need a timestamped, branded PDF for your TPB supervision log? Upgrade to Pro
This ABN may not be registered. Please check the number and try again.
Simple, fast, and accurate ABN verification in 3 steps
Type or paste the 11-digit Australian Business Number you want to verify
Our system queries the Australian Business Register in real-time
View ABN status, GST registration, business name, and entity type instantly
We built this tool after attending World of Accountants 2026. While the big firms talk about global strategy, we saw a practical gap for Sydney practices: the manual grind of ABN verification for offshore teams.
ABNChecker is designed to make Australian compliance "one-click" for the modern firm. No more captchas. No more screenshots. No more paying senior staff rates to do data entry that should be automated.
Questions about bulk verification or compliance features? We're here to help.
Write to us at deep@numois.com
Everything you need to know about ABN verification
Under the new Code of Professional Conduct (Section 40), practitioners must document their quality management system. Numois provides the 'Supervision & Control' log required to prove you are overseeing offshore ABN checks competently. Each lookup generates a timestamped record suitable for TPB audits and professional indemnity documentation.
All data is stored in the Microsoft Azure Sydney (Australia East) region. We do not transmit or store client data outside of Australia, ensuring you meet your Australian Privacy Principle (APP) obligations and data sovereignty requirements. This is critical for firms with offshore teams handling Australian client engagements.
An Australian Business Number (ABN) is a unique 11-digit identifier issued by the Australian Business Register (ABR) to businesses, companies, and other entities operating in Australia. It is used for tax purposes and business identification.
You can verify an ABN using our free ABN lookup tool. Simply enter the 11-digit ABN and our system will query the Australian Business Register to confirm validity, GST registration status, business name, and entity type in real-time.
GST (Goods and Services Tax) registration means a business is registered to collect GST on taxable supplies and can claim GST credits on business purchases. Businesses with annual turnover over $75,000 must register for GST. You can verify GST registration status using our ABN lookup tool.
ABN data in our tool is sourced directly from the Australian Business Register (ABR) and cached for 24 hours. The ABR is the official government register and is updated in real-time when businesses make changes. For the most current data, always perform a fresh lookup.
Yes, our ABN lookup tool is completely free for individual lookups. You can verify ABN validity and GST registration status at no cost. For bulk ABN verification, visit our bulk verification page.
Yes. The free tool is designed to replace the government ABR site for daily checks (no captchas). Your offshore team can use it for individual ABN verifications. We recommend the Professional tier for Sydney offices to automatically collect those checks into a branded audit pack. See bulk verification options.
We pull data directly via the ABR (Australian Business Register) API, ensuring you see the exact status reflected in the official government records at that moment. Data is cached for 24 hours for optimal performance. For historical date checks, we query the ABR as-at that specific date.
Verifying your supplier's GST registration status is critical for claiming input tax credits. If you claim GST credits from a supplier whose GST registration has been cancelled, you may face ATO penalties and need to amend your BAS. Always verify GST status before processing invoices.
Our Professional tier (launching Feb 2026) includes direct sync for Xero/MYOB. For now, you can upload a CSV export of your client list to initiate a bulk audit in under 60 seconds. For full invoice-to-verification automation, check out InvoTrust.
Yes. Our bulk verification service (launching Feb 2026) allows you to upload your vendor or client list once and schedule it to run every Monday morning or on a specific day of the month. You'll receive automated alerts if any supplier cancels their GST registration.
Absolutely. Our bulk tool allows you to specify a 'Transaction Date' for each ABN in your upload file, verifying GST status exactly as it was on that day. Perfect for retrospective BAS reviews, annual audits, and compliance checks. Each verification generates a timestamped audit trail document.
Our scheduled monitoring service automatically checks your vendor list at your chosen frequency (weekly or monthly). If any supplier cancels their GST registration, changes their ABN status, or updates their business details, you receive an instant email alert with the specific changes. This helps you identify compliance risks before processing invoices or lodging BAS returns.
All verification reports are delivered as timestamped PDF documents with official ABR data stamps. Each report includes the verification date, ABN details, GST status as-at-date, and a unique reference number. Reports are stored for 12 months and can be downloaded anytime for client workpapers, ATO audits, or compliance reviews. CSV exports are also available for bulk verifications.
Currently, our bulk verification service works via CSV upload and email reports. For direct integration with Xero, MYOB, or QuickBooks, check out InvoTrust which automatically reads invoices from your system, verifies ABN/GST status, and flags any compliance issues before data entry. InvoTrust includes real-time verification, duplicate detection, and automated workpaper generation.
Yes. All data is stored in Azure data centers located in Sydney, Australia. Your vendor lists and verification history never leave Australian soil. We use enterprise-grade encryption (AES-256) for data at rest and TLS 1.3 for data in transit. Verification reports are automatically deleted after 12 months unless you configure longer retention. We are SOC 2 Type II compliant and follow Australian Privacy Principles (APP).
Yes, the ABN lookup tool works perfectly on Mac, Windows, Linux, and all modern devices. It's a web-based application that runs in your browser (Chrome, Safari, Firefox, Edge), so there's nothing to install. The bulk verification service is also platform-independent - simply upload your CSV file from any device and receive reports via email. Our tool is optimized for desktop and mobile use.
For bulk verification, automated monitoring, and professional audit PDFs, explore our compliance automation tools.
Australia Data Residency · Sydney-based support · TPB(I) 48/2024 compliant