GST and Business Tax Australia — Complete Guide for Sole Traders and Small Business

Goods and Services Tax (GST) is a 10% tax on most goods and services sold in Australia. If your business has a turnover of $75,000 or more per year — or $150,000 if you are a non-profit — you must register for GST and start collecting it from customers. For freelancers, sole traders, and small business owners, understanding your GST obligations, ABN requirements, and Business Activity Statement (BAS) lodgement is fundamental to staying compliant with the ATO.

This cluster covers GST basics, BAS lodgement, the tax obligations of sole traders and self-employed people, Fringe Benefits Tax (FBT), and the state-based payroll tax system.

GST Fundamentals

• GST Australia Explained — How Goods and Services Tax Works — The 10% rate, taxable vs GST-free vs input-taxed supplies, and why businesses collect it on behalf of the government
• When Do You Need to Register for GST? — The $75,000 threshold, voluntary registration below the threshold, and rideshare/taxi drivers (must register regardless of turnover)
• How to Register for GST — Registering via ABN application or separately through the ATO Business Portal, and what happens after registration
• GST-Free vs Input Taxed Supplies — The difference between GST-free items (basic food, exports, education, healthcare) and input-taxed supplies (residential rent, financial services)
• GST on Property Transactions — The GST rules for new residential property sales, commercial property, and the margin scheme

Business Activity Statement (BAS)

• BAS — Business Activity Statement Explained — What a BAS covers (GST, PAYG withholding, PAYG instalments, FBT instalments), lodgement frequency, and how to lodge
• How to Lodge a BAS — Online lodgement via myGov/business portal, through a BAS agent, or via accounting software (Xero, MYOB)
• BAS Deadlines and Penalties — Monthly, quarterly, and annual BAS deadlines, and the penalty regime for late lodgement

Sole Trader and Self-Employed Tax

• Sole Trader Tax Australia — How It Works — How sole traders are taxed on business income (as individuals), the business schedule, and allowable deductions
• How to Set Up an ABN — Registering for an Australian Business Number, the free process via abr.gov.au, and what you can do with an ABN
• PAYG Instalments for Self-Employed and Investors — When the ATO puts you into the PAYG instalment system, how to vary your instalments, and the four-quarter payment schedule

Fringe Benefits Tax (FBT)

• Fringe Benefits Tax Explained — The 47% FBT rate, the FBT year (1 April – 31 March), the three methods for calculating FBT, and which benefits are exempt
• FBT Exemptions — Electric Vehicles and Salary Packaging — The electric vehicle FBT exemption, the $9,000 minor benefits exemption, and common exempt benefits (work laptops, portable devices)

Payroll Tax

• Payroll Tax Australia — State by State Guide — Each state’s threshold and rate (NSW: $1.2M at 5.45%; VIC: $900k at 4.85%; QLD: $1.3M at 4.75%; WA: $1M at 5.5%), and how it is calculated
• What Is Payroll Tax and Who Pays It? — The employer obligation, the annual versus monthly liability, and whether contractors are included in the calculation
• Payroll Tax Grouping Provisions — How related companies are grouped for payroll tax purposes, and why a holding company and subsidiary share one threshold

Small Business Tax Concessions

• Small Business Tax Concessions Australia — Instant asset write-off, simplified depreciation rules, trading stock concessions, and income averaging available to businesses under the $10M threshold
• Instant Asset Write-Off — Current Rules — The current threshold for immediate deduction of asset purchases, the small business eligibility, and how to claim in your tax return

GST — The Basics Every Business Owner Needs to Know

The fundamental rule: If your business turnover reaches $75,000 per year ($150,000 for non-profits), you must register for GST and charge customers an additional 10% on taxable supplies. You then remit the collected GST to the ATO (less GST credits on your own purchases) via your Business Activity Statement (BAS).

Input tax credits: When your business pays GST on purchases (goods, services, equipment), you can claim back the GST you paid as an input tax credit — offsetting it against the GST you collect. The net GST payable to the ATO = GST collected on sales minus GST credits on purchases.

Cash vs accruals basis: Most small businesses report GST on a cash basis (when money is received or paid). Businesses above $10M must use accruals accounting. The choice of basis affects your BAS timing but not the total GST liability over time.

Key Thresholds and Obligations Summary

BAS Lodgement Frequency

Your BAS lodgement frequency depends on your annual GST turnover:

Quarterly BAS deadlines are 28 days after the end of each quarter (28 October, 28 February, 28 April, 28 July) with a slight extension when lodging through the ATO’s online services or a registered BAS agent.

Sole Traders — The Tax Basics

A sole trader is the simplest business structure in Australia. Key tax obligations:

• ABN: Required for any business activity. Free to register at abr.gov.au
• Taxed as an individual: Business income is included in your personal tax return (the business schedule). You pay income tax at ordinary resident rates — no separate company tax rate
• Deductions: All legitimate business expenses are deductible — equipment, software subscriptions, professional memberships, home office, vehicle costs, training directly related to your business
• PAYG instalments: Once you earn significant business or investment income, the ATO places you into the PAYG instalment system — quarterly pre-payments of estimated income tax to avoid a large year-end bill

Frequently Asked Questions

Do I need to register for GST as a sole trader?

Only if your annual turnover reaches $75,000 or more. Below this threshold, registration is voluntary (and may be beneficial if you have significant GST-creditable business purchases). Above the threshold, registration is mandatory — failure to register is a compliance breach and may attract penalties.

What is the difference between GST and income tax?

GST is a tax on goods and services transactions — collected from customers, passed through your business to the ATO. Income tax is a tax on your profit (income minus deductions) — paid by your business or as a personal tax. They are separate obligations with separate lodgement and payment timelines. An ABN-holding sole trader has both GST obligations (via BAS) and income tax obligations (via tax return).

What records does the ATO require for GST?

You must keep records of all taxable supplies, GST-free supplies, input-taxed supplies, and purchases for which you claim input tax credits. Records must be kept for five years and must be in English or convertible to English. Accounting software (Xero, MYOB, QuickBooks) automates most of this record-keeping.

GST Input Tax Credits — How Businesses Claim Back GST

A business registered for GST can claim back the GST paid on business purchases — these are called input tax credits (ITCs). The net GST remitted to the ATO is:

GST collected on sales − GST paid on purchases = Net GST payable

Example: A plumbing business collects $22,000 GST from customers in a quarter. It pays $3,500 GST on materials and $1,200 GST on tools and equipment. Net GST payable = $22,000 − $4,700 = $17,300.

Not all purchases qualify for ITCs. Input tax credits cannot be claimed on:

• Private/personal expenses (mixed-use requires apportionment)
• Purchases where no GST was charged (GST-free or input-taxed supplies)
• Entertainment and meal expenses (limited to 50% for FBT purposes)

GST invoices: To claim an ITC, you must hold a valid tax invoice from the supplier showing their ABN, GST amount, and total. For purchases over $1,000, the invoice must include the buyer’s details.

Quarterly vs Annual GST Lodgement

Most small businesses lodge Business Activity Statements (BAS) quarterly — covering GST, PAYG withholding, and other tax obligations. Businesses with turnover under $75,000 can elect annual GST lodgement, which simplifies compliance but requires quarterly PAYG instalments.

The ATO’s online BAS lodgement through myGov Business or accounting software (Xero, MYOB, QuickBooks) is the most common approach. BAS must be lodged and any net GST paid within 28 days of the end of each quarter.

This section provides general tax information for educational purposes. Tax rules for businesses are complex and penalties for non-compliance can be significant. For advice tailored to your situation, speak with a registered tax agent or BAS agent. Find one through the Tax Practitioners Board register.