• 29 June, 2025

ABN vs TFN in Australia: Which One Do You Need?

Understanding ABN and TFN in Australia

Confused about whether you need an ABN (Australian Business Number) or a TFN (Tax File Number)?

You’re not alone. This is one of the most common questions for Australians starting a job, freelancing, or launching a side business.

Choosing the right option is crucial because it affects your:

• Tax obligations
• Income reporting
• Legal working status
• Compliance with the ATO

This guide will help you clearly understand the difference and decide what’s right for you.

What Is a TFN (Tax File Number)?

A Tax File Number (TFN) is your personal tax identity issued by the Australian Taxation Office (ATO).

Key Uses of TFN:

• Employment (salary and wages)
• Lodging tax returns
• Superannuation tracking
• Opening bank accounts
• Applying for Centrelink benefits

⚠️ Important:
If you don’t provide your TFN to your employer, your income may be taxed at the highest rate (up to 47%).

👉 Your TFN is private and confidential—never share it publicly.

What Is an ABN (Australian Business Number)?

An Australian Business Number (ABN) is a public 11-digit identifier used for business activities.

You Need an ABN If You:

• Work as a freelancer or contractor
• Run a small business or side hustle
• Issue invoices to clients
• Provide services independently

Benefits of Having an ABN:

• Get paid without highest tax withholding
• Register for GST
• Claim business expenses
• Build a professional business identity

👉 Your ABN is publicly visible on the Australian Business Register (ABR).

ABN vs TFN: Key Differences

Factor	TFN	ABN
Purpose	Personal tax ID	Business identification
Who needs it	Employees	Businesses, freelancers
Tax handling	Employer deducts tax	You manage your own tax
Visibility	Private	Public
Superannuation	Employer pays	You manage yourself

How to Decide: ABN or TFN?

The decision depends on how you earn your income.

✔️ Choose TFN if:

• You are an employee
• You receive a salary or wages
• Tax is deducted by your employer

✔️ Choose ABN if:

• You are a contractor or freelancer
• You issue invoices
• You run a business or side hustle

👉 Simple Rule:
Employee = TFN | Business = ABN

Can You Have Both ABN and TFN?

Yes—and many Australians do.

Common Scenario:

• Full-time job → Use TFN
• Side business (e.g., Uber Eats, freelancing) → Use ABN

📌 Important:

• You must declare both income sources in your tax return
• Keep records separately

GST and Tax Obligations

GST Registration

You must register for GST if:

• Your business turnover exceeds $75,000 per year

With an ABN, You Must:

• Lodge Business Activity Statements (BAS)
• Set aside money for tax
• Track income and expenses

With a TFN:

• Employer handles tax withholding
• You lodge an annual tax return

Common Mistakes to Avoid

Avoid these critical errors:

❌ Using ABN when you are actually an employee (sham contracting)
❌ Not declaring ABN income
❌ Missing GST registration threshold
❌ Poor record-keeping
❌ Mixing personal and business finances

👉 These mistakes can lead to ATO penalties and audits.

ABN vs TFN Compliance Risks

High-Risk Situations:

1. Sham Contracting
Employers forcing workers to use ABN illegally.

2. Under-reporting Income
Failing to declare side income.

3. GST Non-Compliance
Not registering after crossing $75,000 turnover.

4. Inactive ABN
ATO may cancel if unused.

How to Apply for TFN or ABN

TFN Application:

• Apply via myGov or Australia Post
• Provide identity documents

ABN Application:

• Apply through the Australian Business Register (ABR)
• Must confirm you are running a business
• Requires your TFN

Why Choosing the Right Option Matters

Selecting the correct structure helps you:

• Avoid unnecessary tax
• Stay compliant with ATO
• Manage finances efficiently
• Build a legitimate business
• Reduce risk of penalties

How Workpaper Can Help

At Workpaper Accounting Services, we help individuals and businesses:

• Decide between ABN and TFN
• Set up ABN and business structure
• Manage tax compliance and GST
• Handle bookkeeping and BAS lodgements
• Avoid costly ATO mistakes

📞 Contact Workpaper Today

Need expert advice on ABN or TFN?

• 📞 Phone: 0485 825 915
• 📧 Email: info@workpaper.com.au
• 📍 Address: 7 Bridge St, Werribee, Victoria 3030, Australia
• 🌐 Website: https://workpaper.com.au/

 

Final Thoughts

Understanding the difference between ABN and TFN in Australia is essential for anyone earning income.

Whether you’re an employee, freelancer, or running a business, making the right choice ensures:

• Better tax management
• Legal compliance
• Financial clarity