How to Set Up an ABN in Australia: Complete Step-by-Step Guide [2025]

Last update: Jul. 17, 2025

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Starting a business in Australia? One of your first essential steps is obtaining an Australian Business Number (ABN). Whether you're launching a side hustle, becoming a freelancer, registering as a sole trader, or establishing a company, your ABN is the key that unlocks legitimate business operations.

The good news? Setting up an ABN is far easier than most people think. This comprehensive guide will walk you through every step of the process, from determining your eligibility to receiving your 11-digit ABN and getting your business officially registered.

What is an ABN and Why Do You Need One?

An Australian Business Number (ABN) is a unique 11-digit identifier issued by the Australian Business Register (ABR) that identifies your business to the government, other businesses, and the community. Think of it as your business's official identification number - similar to how individuals have a Tax File Number.

What Your ABN Enables You To Do:

• Issue Professional Invoices: Include your ABN on invoices to avoid 46.5% withholding tax from business clients
• Register a Business Name: You must have an ABN before registering a business name with ASIC
• Register for GST: Essential if your turnover exceeds $75,000 annually
• Claim Tax Credits: Access GST credits, fuel tax credits, and other business concessions
• Register Australian Domain Names: Secure .com.au and .net.au domain names for your business
• Establish Business Legitimacy: Demonstrate to clients and suppliers that you're a registered, legitimate business
• Avoid PAYG Withholding: Ensure customers don't withhold tax from payments to your business
• Access Government Grants: Many business grants and programs require an ABN

Do You Actually Need an ABN?

While the Australian Taxation Office (ATO) technically states that you don't need an ABN unless your annual turnover exceeds $75,000, the reality is quite different. You practically need an ABN to operate any serious business venture in Australia.

⚠️ Important: The 46.5% Withholding Tax

If you don't provide an ABN when invoicing another business, they are legally required to withhold 46.5% of the payment for tax purposes. This alone makes getting an ABN essential for anyone doing business-to-business work, regardless of turnover.

You should definitely get an ABN if you:

• Are starting any business, even as a side hustle
• Work as a freelancer or independent contractor
• Provide services to other businesses
• Want to register a business name or company
• Plan to earn more than $75,000 annually (GST threshold)
• Need to claim business expenses or tax deductions
• Want professional credibility with clients and suppliers

Step 1: Determine Your Eligibility for an ABN

Before you apply, you need to ensure you're eligible for an ABN. Not everyone can get one - you must meet specific criteria set by the ATO.

Basic Eligibility Requirements:

✓ You Are Eligible If:

• You're carrying on or starting an enterprise in Australia
• You're making supplies connected with Australia's indirect tax zone
• You're an Australian resident (for tax purposes) conducting business activities
• You're a non-resident but carrying on enterprise activities in Australia

What Counts as an "Enterprise"?

According to the ATO, an enterprise includes:

• Business activities: Selling products or services for profit
• Trade or professional activities: Freelancing, consulting, contracting
• Adventures or concerns in the nature of trade: One-off commercial transactions
• Rental or leasing of property: Including short-term accommodation rentals
• Government entities: Specific government bodies and organizations

❌ You Are NOT Eligible If:

• You're an employee working for someone else (your employer has the ABN)
• You're engaged in a hobby with no intention of making profit
• Your activities are purely private or domestic in nature
• You're under 18 and don't have parental consent (in some cases)

The Hobby vs Business Test:

One common confusion area is distinguishing between a hobby and a business. The ATO considers several factors:

Step 2: Gather Your Required Information and Documents

Before starting your ABN application, gather all necessary information. The exact requirements depend on your business structure, but here's what you'll need:

Universal Requirements (All Business Structures):

• Tax File Number (TFN): Your personal TFN or your business entity's TFN
• Proof of Identity: Australian driver's license, passport, or other government-issued ID
• Contact Details: Current residential address, email address, and phone number
• Business Activity Details: Description of what your business does (ANZSIC codes)
• Business Commencement Date: When you started or plan to start trading

Structure-Specific Requirements:

• Your personal Tax File Number (TFN)
• Personal identification details
• Residential address
• Intended business name (if registering one)
• Main business activity description

• Australian Company Number (ACN)
• Company name and registered address
• Company TFN (issued automatically)
• Details of all directors
• Details of shareholders
• Main business activities

• Partnership agreement details
• Names of all partners
• TFNs of all partners (if available)
• Partnership business address
• Percentage of partnership ownership
• Main business activities

• Trust deed or trust documentation
• Names of all trustees
• TFNs of trustees (if available)
• Trust name and type
• Trust establishment date
• Beneficiary information

Processing Times: Sole Traders: Instant (usually), Companies/Partnerships/Trusts: Up to 28 days

💡 Don't Have a TFN Yet?

If you don't have a Tax File Number, you'll need to apply for one first. Australian residents can apply online through the ATO website. The process typically takes 10-30 days. For companies, partnerships, and trusts, a TFN is automatically issued when the entity is established.

Step 3: Choose Your Business Structure

Your business structure is a critical decision that affects your ABN application, tax obligations, liability, and legal responsibilities. Here's a comprehensive breakdown:

1. Sole Trader (Individual)

Best for: Freelancers, contractors, and small business owners operating independently

✓ Advantages:

• Simplest and cheapest structure to set up
• Complete control over business decisions
• Instant ABN approval (usually)
• Minimal compliance requirements
• Easy tax reporting (use personal tax return)

✗ Disadvantages:

• Unlimited personal liability for business debts
• Harder to raise capital
• Business name not protected (must register separately)
• Difficulty separating personal and business assets

2. Company (Pty Ltd)

Best for: Larger businesses, those seeking investment, or those wanting limited liability protection

✓ Advantages:

• Limited liability protection (personal assets protected)
• Easier to raise capital and attract investors
• Professional image and credibility
• Perpetual succession (company continues beyond owners)
• Tax planning opportunities

✗ Disadvantages:

• Higher setup costs (ASIC fees)
• More complex compliance requirements
• Must lodge annual returns with ASIC
• More expensive to operate and maintain
• ABN approval can take up to 28 days

3. Partnership

Best for: Two or more people operating a business together

✓ Advantages:

• Shared responsibility and workload
• Combined skills and resources
• Relatively simple to establish
• Shared financial burden

✗ Disadvantages:

• Unlimited personal liability (unless limited partnership)
• Joint and several liability (each partner liable for all debts)
• Potential for disputes between partners
• Profits must be shared
• ABN approval can take up to 28 days

4. Trust

Best for: Asset protection, family businesses, or investment purposes

✓ Advantages:

• Asset protection benefits
• Tax distribution flexibility
• Succession planning advantages
• Can protect family assets

✗ Disadvantages:

• Complex and expensive to establish
• Requires professional legal advice
• Strict compliance requirements
• Trustee has unlimited liability
• ABN approval can take up to 28 days

💡 Pro Tip: Start Simple, Grow Complex

Most new businesses should start as a sole trader for simplicity and speed. You can always change your business structure later as your business grows. Many successful businesses begin as sole traders and transition to companies once they reach certain revenue thresholds or want liability protection.

Step 4: Complete Your ABN Application

Now for the main event - actually applying for your ABN. You have two main options:

Option 1: Direct ABN Registrar website

Apply directly through ABN REGISTRAR at abnregistrar.com.au or through the Business Registration Service at abnregistrar.com.au/abn-tfn-gst-registration-form.

Access the ABN Application Portal

Visit the Australian Business Register website and select 'Apply for an ABN' or use the Business Registration Service for an all-in-one application that can include GST, business name, and other registrations.

Select Your Business Structure

Choose from sole trader, company, partnership, trust, or other entity types. This determines which questions you'll be asked.

Enter Your Personal Details

Provide your Tax File Number, full legal name, date of birth, residential address, and contact information. For companies/partnerships/trusts, you'll also need details of all associates.

Describe Your Business Activities

Select the appropriate ANZSIC (Australian and New Zealand Standard Industrial Classification) codes that describe what your business does. You can select multiple codes if you have diverse activities.

Specify Business Location and Dates

Enter your main business location, principal place of business, and the date you started (or plan to start) trading. This can be backdated up to 6 months or future-dated.

Add Optional Registrations

If applicable, simultaneously register for GST (required if turnover exceeds $75,000), PAYG withholding, Fuel Tax Credits, or other tax obligations. This saves time by doing everything at once.

Register a Business Name (Optional)

If you want to trade under a business name different from your legal name, you can register it simultaneously through the Business Registration Service. Note: This incurs additional ASIC fees ($39/year).

Review and Submit

Carefully review all information for accuracy. Mistakes can delay processing. Once satisfied, submit your application.

Option 2: Registered Agent Service

Use a registered agent service (like ABN Registrar) to handle the application for you. While this involves a fee, benefits include:

• Expert Guidance: Professional assistance ensuring everything is correct
• Time Savings: The agent handles all paperwork and liaising with government
• Error Prevention: Reduces risk of mistakes that could delay your application
• Comprehensive Service: Can bundle ABN with business name, GST, and other registrations
• Ongoing Support: Access to help if issues arise

💡 Pro Tip: Common Application Mistakes to Avoid

• ❌ Using nicknames instead of legal names
• ❌ Entering incorrect or outdated addresses
• ❌ Selecting wrong business activity codes
• ❌ Forgetting to include all partners/directors/trustees
• ❌ Not having your TFN readily available
• ❌ Applying when you're not actually entitled to an ABN

Step 5: Receive Your ABN and What Happens Next

Application Processing Times:

Instant

Sole Traders (usually)

1-5 Days

Standard Processing

Up to 28

Days (if manual review required)

What to Expect After Applying:

✅ Successful Instant Application (Most Sole Traders):

• Your 11-digit ABN appears immediately on screen
• You receive a confirmation email with your ABN details
• Your ABN is active immediately and can be used right away
• Within 14 days, you'll receive official confirmation from the ATO
• Your business appears on the ABN Lookup database publicly

⏳ Manual Verification Required:

Some applications require manual review by the ATO, particularly for companies, partnerships, trusts, or complex situations. Reasons include:

• First-time company registration
• Non-standard business structures
• Incomplete or unclear information
• Identity verification requirements
• Non-resident applicants

If manual verification is needed, you'll receive an application reference number and the ATO will contact you if additional information is required. Processing can take up to 28 days.

✓ What You'll Receive:

• Your 11-digit ABN (format: XX XXX XXX XXX)
• Registration confirmation showing your business details
• ABN registration date and effective date
• Any additional registrations (GST number if registered)
• Information about obligations and next steps

Immediate Actions After Receiving Your ABN:

• Save Your Documentation: Print or save your ABN confirmation email and certificate
• Verify on ABN Lookup: Check that your business appears correctly on the public ABN Lookup database
• Update Your Records: Add your ABN to all business documents, invoices, and templates
• Notify Your Bank: Provide your ABN if opening a business bank account
• Update Your Website: Display your ABN on your website (legal requirement)
• Create Compliant Invoices: Ensure all invoices include your ABN
• Register Domain Names: Now you can register .com.au domain names
• Set Up Accounting: Establish bookkeeping systems to track income and expenses

Additional Registrations You Might Need

Your ABN is just the beginning. Depending on your business type and turnover, you may also need:

1. Goods and Services Tax (GST) Registration

When Required:

• Mandatory: If your annual turnover is $75,000 or more ($150,000 for non-profit organizations)
• Optional: You can register voluntarily even below these thresholds
• Taxi/Ride-share: Required regardless of turnover

How to Register: Can be done simultaneously with ABN application or separately through the Business Registration Service.

2. Pay As You Go (PAYG) Withholding

When Required:

• If you have employees
• If you pay contractors who don't provide an ABN
• For certain types of business payments

How to Register: Through the Business Registration Service when applying for your ABN or separately online.

3. Business Name Registration

When Required:

• If you're a sole trader operating under any name other than your own
• If your company or trust trades under a different name
• For brand protection and professional credibility

Cost: $39 per year or $91 for 3 years
How to Register: Through ASIC via the Business Registration Service (requires ABN first)

4. Workers Compensation Insurance

When Required:

• If you have employees (requirements vary by state/territory)
• Even for one employee in most states
• Some states require it for contractors too

How to Register: Contact your state's WorkCover authority or approved insurers.

Your ABN Obligations and Responsibilities

Once you have an ABN, you have ongoing legal obligations:

1. Display Your ABN Correctly

Legal Requirement:

• All invoices and receipts
• Your business website
• Business correspondence and emails
• Purchase orders and quotations
• Negotiable instruments (checks, promissory notes)

2. Keep Your Details Current

• Business address or contact details
• Business structure or entity type
• Business name or trading name
• Main business activities
• Associates (partners, directors, trustees)

3. Meet Tax Obligations

• Lodge tax returns: Annual tax return (or company return)
• BAS statements: If registered for GST (quarterly or monthly)
• PAYG reporting: If you have employees
• Keep records: Maintain financial records for 5 years

4. Review ABN Entitlement Annually

• Actually carrying on an enterprise
• Lodging required tax returns
• Meeting other obligations

⚠️ Risk of Cancellation:

• No longer meet entitlement requirements
• Don't lodge required tax returns
• Request cancellation
• Provide false or misleading information

How Much Does Setting Up an ABN Cost?

Direct Government Registration:

Registered Agent Services:

• ABN Registration Service: Typically $50-$200
• Bundled Packages: Often include ABN + Business Name + GST for discounted rates
• Company Formation + ABN: $600-$1,500 (includes ASIC fees + service fees)

💡 Pro Tip: Is an Agent Worth It?

DIY if: You're a sole trader with straightforward circumstances and comfortable with online forms
Use an agent if: You're setting up a company, partnership, or trust, have complex circumstances, or want expert guidance and peace of mind

Frequently Asked Questions About Setting Up an ABN

How long does it take to get an ABN?

Most sole traders receive their ABN instantly (within seconds) online. Companies, partnerships, and trusts may take 1-5 business days for standard processing, or up to 28 days if manual verification is required. You'll receive an application reference number immediately that you can use for some purposes while waiting.

Can I get an ABN without a Tax File Number?

No, you need a TFN to apply for an ABN. If you don't have one yet, apply for your TFN first through the ATO website. For companies, partnerships, and trusts, a TFN is automatically issued when the entity is registered, so you can apply simultaneously.

Does an ABN cost anything to maintain?

No, maintaining an ABN is completely free. Unlike business names (which require annual renewal fees), your ABN remains active at no cost as long as you continue to operate your business and meet your obligations.

Can I backdate my ABN?

Yes, you can backdate your ABN up to 6 months from the date you apply. This is useful if you've already started trading. However, be aware that backdating may create tax obligations for that earlier period.

What if my ABN application is rejected?

ABN applications are rarely rejected outright. Usually, the ATO will request additional information or clarification. Common reasons for delays include: unclear business activities, eligibility questions, or missing information. You can reapply after addressing the issues raised.

Do I need an ABN for a side hustle or small freelance work?

If you're operating a business (even part-time), you should get an ABN. Without one, businesses paying you must withhold 46.5% for tax. The only exception is if you're an employee - in that case, you use your employer's ABN.

Can non-residents get an ABN?

Yes, non-residents can get an ABN if they're carrying on or starting an enterprise in Australia, or making supplies connected with Australia's indirect tax zone. Additional identity verification documents may be required.

What's the difference between an ABN and an ACN?

An ABN (Australian Business Number) identifies any business entity. An ACN (Australian Company Number) is specifically for companies registered with ASIC. Companies have both - an ACN from ASIC and an ABN from the ATO.

Can I have multiple ABNs?

Generally, no. One business entity has one ABN. However, you can register multiple business names under a single ABN. If you operate truly separate business entities with different structures, each entity would need its own ABN.

What happens if I stop trading?

You should cancel your ABN when you stop trading permanently. This can be done online through the ABR website. Keep records for 5 years after cancellation. You can reapply for a new ABN if you start a business again later.

Ready to Set Up Your ABN?

Setting up an ABN is one of the most important steps in establishing your Australian business. While the process might seem daunting at first, it's actually quite straightforward when you follow the right steps:

📋 Quick Recap: 5 Steps to Get Your ABN

• Check Eligibility: Ensure you're carrying on an enterprise in Australia
• Gather Documents: Collect your TFN, ID, and business details
• Choose Structure: Decide on sole trader, company, partnership, or trust
• Apply Online: Complete the application through ABR or Business Registration Service
• Receive ABN: Get instant confirmation (or wait for manual verification)

Remember, your ABN is just the beginning of your business journey. Once registered, stay on top of your obligations, keep your details current, and use your ABN correctly on all business documents.

Get Your ABN Set Up Today - Fast, Easy & Compliant

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Join thousands of Australian businesses who have successfully registered their ABN with professional assistance

This guide provides general information about ABN registration in Australia as of November 2025. ABN registration requirements, processes, and fees may change. Always verify current requirements with the Australian Business Register (ABR) and Australian Taxation Office (ATO). For specific advice regarding your business circumstances, consult with a qualified accountant, tax advisor, or business consultant. ABN Registrar provides registration services but this article is for educational purposes only and does not constitute professional business, tax, or legal advice.