ABN Lookup Tool
Look up Australian Business Numbers (ABN) and verify GST registration status for any business.
Look up any Australian Business Number (ABN) to verify a business is registered and check their GST status. Enter a business name or ABN below to calculate GST amounts.
- Visit abr.business.gov.au for official ABN lookups
- All businesses with turnover above $75,000 must have an ABN and register for GST
- An ABN is required to issue tax invoices
- Check ABN status before paying invoices to ensure the business is genuine
Disclaimer
This calculator provides estimates for general information purposes only. Results should not be relied upon as professional financial, tax, or legal advice. Tax rates and thresholds are based on publicly available ATO data and may change. Always consult a qualified tax agent or financial adviser for advice specific to your circumstances.
Frequently Asked Questions
What is an ABN and do I need one?
What happens if a supplier doesn't have an ABN?
What is ABN Lookup Tool?
An ABN (Australian Business Number) is an 11-digit identifier issued to businesses operating in Australia. ABN lookup verifies that a business is legitimately registered and checks whether they are registered for GST.
How this calculator works
Use this GST calculator alongside the official ABN Lookup (abr.business.gov.au) to verify business registrations and calculate GST amounts for invoicing. All businesses with an annual turnover of $75,000 or more ($150,000 for non-profits) must register for GST and charge 10% on taxable supplies. When paying a supplier, always verify their ABN — if they don't provide one, you may need to withhold 47% from the payment under the no-ABN withholding rules. A valid tax invoice must include the supplier's ABN, the GST amount, and be issued within 28 days.
ABN Format and Validation
11 digits formatted as XX XXX XXX XXX (e.g. 33 102 417 032). The first two digits include a check sum that mathematically validates the rest. Real ABN Lookup (abr.business.gov.au) checks: registration status (active/cancelled), entity type (sole trader, company, trust, partnership), GST registration status, business names, ASIC ACN if applicable. Free public service from the Registrar of the Australian Business Register.
Why ABNs Matter for Business
Invoicing: must include supplier ABN on tax invoices over $82.50 (otherwise GST credits can't be claimed). Paying suppliers: no ABN provided triggers 'no-ABN withholding' rule — you must withhold 47% from the payment and remit to ATO. Banking: businesses typically need an ABN to open business accounts. ATO portal access for managing tax, BAS, super, employer obligations.
Getting an ABN
Free via abr.gov.au (about 15 mins). Eligibility: you're carrying on or starting an enterprise in Australia. The ATO assesses 'enterprise' broadly — most income-producing activities qualify (consulting, freelancing, online sales, investments, primary production). Hobby/casual income (e.g. one-off Etsy sale) generally doesn't require ABN. Misuse of ABN for hobby activities can lead to cancellation.
GST Registration via ABN
Required when annual turnover exceeds $75,000 ($150,000 for NFPs). Optional below that threshold. To check: each ABN entry on abr.business.gov.au shows 'GST registered Yes/No' and registration date. Some businesses are GST-registered voluntarily even below the threshold to claim GST credits on inputs — common for B2B service providers.
Official Sources
All calculations are performed in your browser — your data never leaves your device. Results are for general guidance only and should not be considered professional financial advice.
Built and maintained by Konstantin Iakovlev. Data sourced from the ATO and official Australian government sources.