Small Business Tax Guide Australia: ATO Basics and GST Rules

Starting out as a small business in Australia is exciting, but figuring out your tax obligations with the Australian Taxation Office (ATO) can feel overwhelming at first. The good news is that once you understand a few key rules—like when to register for GST, how to use ATO online services and what records to keep—staying compliant becomes part of your normal business routine.

This guide explains small business tax obligations from a sole trader’s perspective: how the ATO sees you, which registrations you need, how BAS works, what you can claim, and the simple systems that make tax time easier. You will also find helpful external resources so you can dive deeper into topics like BAS, online services and common sole‑trader mistakes.

1. What “small business” means when you are a sole trader

As a new sole trader, you are running a business in your own name and using your own tax file number (TFN), but the ATO will still treat you as a small business if your turnover is under specific thresholds. Many small business concessions use an aggregated turnover of under 10 million AUD, but the exact threshold can change depending on the rule.

For you, the important point is that you:

• Lodge an individual tax return, using the business schedule to report your sole‑trader income and expenses
• May be able to access small business tax concessions if you meet the turnover tests
• Need to keep proper records like any other business

If you are unsure whether your activities count as a business or a hobby, start with the ATO’s overview on tax and small business.​

For a more practical look at how sole trader tax works—including rates, dates and what to claim—check out Xero’s guide “Sole trader tax: how much you pay and what to claim in Australia”.​

2. First steps: TFN, ABN and registering as a small business

You do not need a separate TFN to be a sole trader—you use your individual TFN—but you will almost certainly need an Australian Business Number (ABN). An ABN lets you issue proper invoices, register for GST if needed and avoid higher “no‑ABN” withholding when dealing with other businesses.

Key setup steps for new sole traders include:

• Confirming that you are actually running a business (not just a hobby)
• Applying for an ABN online through the Australian Business Register
• Deciding if you need to register for GST now or simply monitor your income against the threshold
• Setting up a basic record‑keeping system from day one

The ATO’s page Supporting your small business walks through registrations, choosing a structure and planning your first tax year.​

To see how these decisions play out for sole traders, revisit Xero’s sole trader tax overview.​

3. Using ATO online services and the ATO app

As a new sole trader, your main hub for dealing with the ATO will be ATO online services, accessed through your myGov account. This is where you can view and lodge your tax return, see your BAS, check amounts owing and use myTax if you lodge yourself.

To get started you will need to:

• Create a myGov account (if you do not already have one)
• Link your myGov account to the ATO
• Log in to Online services for individuals and sole traders
• Download the ATO app and use tools like myDeductions to capture expenses

The ATO explains this setup in detail in its guide Online services for individuals and sole traders (with a supporting PDF) on the same URL. You can also browse the broader Online services hub to see how different users manage their tax digitally.

4. Understanding GST and when you must register

One of the biggest questions new sole traders have is when they need to register for Goods and Services Tax (GST). GST is a 10% tax on most goods and services sold in Australia, and for many new businesses it does not apply straight away.

You must register for GST if:

• Your annual GST turnover reaches or is expected to reach 75,000 AUD, or
• You provide taxi, limousine or ride‑sourcing services, regardless of turnover

Once registered, you will:

• Add 10% GST to your taxable sales
• Give customers proper tax invoices
• Report and pay GST via Business Activity Statements (BAS)
• Claim GST credits on eligible business purchases

If you are using software, the QuickBooks article “GST overview for QuickBooks Self‑Employed” shows how GST is tracked and reported inside a cloud system.​

For a sole‑trader‑specific perspective, Reckon’s Sole Trader BAS Guide explains GST registration, calculations and dates in plain English.​

5. BAS explained: what new sole traders need to know

If you are registered for GST or brought into the PAYG instalments system, you will need to lodge Business Activity Statements (BAS). Think of BAS as the form that reports your GST, PAYG and certain other obligations for a given period.

As a sole trader, your BAS might include:

• GST on your sales and purchases
• PAYG instalments (pre‑payments of income tax)
• PAYG withholding if you have employees

Reckon’s Sole Trader BAS Guide walks through whether you need to lodge BAS, what records to gather and how to access BAS via myGov.​

For a step‑by‑step example of lodging, MYOB’s guide How to lodge a Business Activity Statement as a sole trader shows how to lodge via software, online services or paper.​

6. Income tax and common deductions for sole traders

Sole traders pay tax at individual rates, but the income you report is your business income minus allowable business deductions. Getting this right avoids overpaying and reduces the risk of ATO issues.

Typical sole trader income includes payments from clients, side‑gig income and non‑cash payments received for your services.

Common deductions for sole traders include business‑related phone and internet, home‑office costs, tools and equipment, vehicle expenses, marketing and professional fees such as accounting and tax advice.

To avoid common mistakes, read the ATO’s article Handy tax time tips for sole traders. It links into the broader Tax Time toolkit for small business, which bundles guides on concessions, home‑based business expenses, vehicle costs and more.

Several accountant‑written pieces, such as TaxAssist’s Handy Tax Time Tips for Sole Traders and similar guides, mirror the ATO’s advice and add practical examples. Read these alongside Xero’s sole trader tax guide for a rounded view of what you can claim.

7. Record keeping habits that make tax time easier

If you build good record‑keeping habits from day one, tax time becomes far less stressful. The ATO expects you to keep accurate and complete records for at least five years to support your income, deductions and BAS figures.

Practical tips for new sole traders include:

• Use a separate bank account for business transactions
• Record income and expenses regularly, using a spreadsheet or software
• Keep digital copies of receipts and invoices, ideally via the myDeductions tool in the ATO app
• Store key documents like asset purchase invoices and finance agreements safely

The ATO’s Handy tax time tips for sole traders strongly emphasises good record keeping and recommends the Tax Time toolkit and ATO app to stay organised. Clear Tax’s article Handy Tax Time Tips for Sole Traders echoes this advice and provides extra checklists you can adapt.

8. Deadlines, common mistakes and how to avoid penalties

It is easy to lose track of deadlines when you are busy running your business, but missing them can trigger penalties and interest. Knowing your key dates and common pitfalls upfront is a big step toward staying on top of things.

In general:

• Individual tax returns (including your sole‑trader business schedule) are usually due 31 October if you lodge yourself
• Registered tax agents often have extended lodgement dates if you register with them in time
• Quarterly BAS are typically due 28 days after the end of each quarter, with some concessions for online or agent lodgement
• Late lodgement or late payment can result in penalties and interest

The ATO’s Handy tax time tips for sole traders lists frequent mistakes like failing to report all income, over‑claiming expenses and not registering for GST when required. QBE’s guide Small business tax time made easy offers another simple rundown of dates and tips for sole traders, partnerships and companies.

If you need help paying, the ATO’s page Pay with online services explains payment options (BPAY, card, bank transfer) and how to set up payment plans.​

9. Getting help: ATO toolkits, education and professional support

You do not have to do everything alone—there are plenty of free ATO resources plus paid professional help if you need it.

Start with the ATO’s Small business guides and the dedicated Tax Time toolkit for small business for year‑round tips and fact sheets.

Then explore the ATO’s Resources to help small businesses hub for calculators, webinars and education modules.​

The Online services for individuals and sole traders page shows you how to make the most of tools like myTax, myDeductions and secure messaging.​

For non‑ATO perspectives, you can lean on Xero’s sole trader tax guide, Reckon’s Sole Trader BAS Guide and MYOB’s BAS explainer How to lodge your BAS as a sole trader, all written for beginners.

If your situation is more complex or you simply want peace of mind, consider working with a registered tax or BAS agent. Many firms publish their own handy tax time tips for sole traders, which can help you choose an adviser whose style you like, such as TaxAssist’s guide for sole traders.

10. Simple checklist for brand‑new sole traders

To bring it all together, here is a simple checklist you can adapt to your own business:

• Confirm that you are running a business (not just a hobby)
• Apply for an ABN and keep your details current
• Set up myGov and link it to ATO online services
• Decide whether you need to register for GST now or monitor your turnover
• Choose a basic record‑keeping system and open a separate business bank account
• Learn the basics of BAS using guides like Reckon’s Sole Trader BAS Guide and MYOB’s BAS how‑to
• Read the ATO’s Handy tax time tips for sole traders and Tax Time toolkit for small business
• Note key deadlines for tax returns and any BAS you need to lodge
• Contact a registered tax or BAS agent if you feel out of your depth

With these foundations in place and the right mix of ATO resources and third‑party guides, your small business tax obligations as a sole trader will feel far more manageable, leaving you free to focus on growing your business.