GST for small businesses in Australia: Registration, BAS & Tax Credits
Starting or growing a business in Australia means getting GST right from day one. It affects your pricing, invoicing, cash flow, and your standing with the ATO.
Yet for many small business owners, the questions pile up fast. When do you need to register? What counts toward your turnover? What can you claim back? What happens if you get it wrong?
This blog post answers all of that. Whether you are a sole trader approaching your first revenue milestone or a business that has just crossed the $75,000 threshold, we cover everything from registration and turnover calculations to BAS lodgement and common mistakes, so you can stay compliant and focus on running your business.
We will walk you through everything you need to know, from registration and turnover calculations to BAS lodgement and common mistakes, so you can stay compliant and focus on running your business.
Key takeaways
GST is a 10% tax applied to most goods and services sold in Australia.
Businesses with a GST turnover of $75,000 or more must register for GST.
New businesses must register if they expect to exceed the GST threshold within their first year.
GST-registered businesses collect GST from customers and remit the net amount to the ATO.
GST and BAS are different. GST is the tax, while BAS is the form used to report and pay it.
What is GST?
GST (Goods and Services Tax) is a broad-based 10% tax applied to most goods, services, and other items sold or consumed in Australia. It was introduced on July 1, 2000 and is administered by the Australian Taxation Office (ATO).
If your business is registered for GST, you are essentially acting as a tax collector on behalf of the government. You charge 10% GST on top of your prices, collect it from your customers, and periodically pass it on to the ATO after deducting any GST you have already paid on your own business purchases.
This system is designed so that GST is ultimately borne by the end consumer, not by businesses in the supply chain.
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Do you need to register for GST?
Not every business in Australia is required to register for GST. Knowing whether you must register, and when, is one of the first things to work out when starting or growing a business.
When do you need to register for GST in Australia?
You must register for GST if any of the following apply to you:
- Your business or enterprise has a GST turnover of $75,000 or more
- You are starting a new business and expect your turnover to reach the GST threshold in the first year of operation
- Your non-profit organisation has a GST turnover of $150,000 per year or more
- You provide taxi or limousine travel for passengers (including ride-sourcing) regardless of your GST turnover
- You want to claim fuel tax credits for your business or enterprise
Once your GST turnover reaches the relevant threshold, you have 21 days to register. Delaying this can result in back-payments of GST on past sales, even if you never collected it from customers.
Voluntary GST registration
If your turnover is below $75,000, registering for GST is optional. Many small business owners still choose to register voluntarily for the following reasons:
- You can claim GST credits on business expenses, reducing your overall costs
- It can make your business appear more established and credible to larger clients
- Some industries and clients specifically prefer or require dealing with GST-registered suppliers
If you choose to register voluntarily, you generally must stay registered for at least 12 months before cancelling.
GST at a glance
If you are looking for a quick overview of GST obligations for Australian businesses, the table below highlights the most important information you need to know.
| GST Topic | Key Information |
|---|---|
| GST Rate | 10% |
| Registration Threshold | $75,000 annual turnover |
| Registration Deadline | Within 21 days of reaching the threshold |
| BAS Lodgement | Monthly, quarterly, or annually |
| GST Credits Available | Yes, on eligible business expenses |
| Record Keeping Requirement | Minimum 5 years |
| Voluntary Registration | Available below $75,000 turnover |
How to register for GST?
Before you register, you need to apply for an Australian Business Number (ABN). Once you have an ABN, you can register for GST through your registered tax or BAS agent, via online business services, or by calling the Australian Taxation Office on 13 28 66.
The ATO will notify you in writing of your GST registration details, including the date your registration is effective. You only need to register once, even if you operate more than one business. Once registered, you must lodge a Business Activity Statement regularly.
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What goods and services are subject to GST?
Not everything you sell attracts GST. Australian sales fall into three categories:
Taxable sales: GST of 10% applies. This covers most retail goods, professional services, consulting, repairs, and restaurant meals.
GST-free sales: No GST charged, but you can still claim input tax credits on related purchases. This includes:
- Basic unprocessed food (bread, milk, groceries)
- Medical and health services
- Education courses and vocational training
- Exports to overseas recipients
- Approved childcare and certain charitable activities
Input-taxed sales: No GST charged, and no GST credits can be claimed on related purchases. This includes residential rental income, financial services, and life insurance.
What are input tax credits, and how do you claim them?
An input tax credit (ITC) is a credit registered businesses claim to get back the GST paid on business expenses. These credits offset what you owe on your BAS, reducing your ATO payment or triggering a refund.
To claim, you must be registered for GST, have a business purpose, and hold proof, which means a receipt for $82.50 or less, or a valid tax invoice for anything over $82.50. For mixed-use purchases, you can only claim the business percentage.
You cannot claim credits for personal expenses, purchases past a 4-year deadline, or items without GST, like wages, fresh food, bank fees, and residential rent. Keeping track of these receipts is much simpler with a professional online bookkeeping team that manages transaction tracking and secure records storage.
Finally, you cannot double-dip on your income tax return: your tax deduction is always the purchase price minus the GST credit. For a $22 stationery buy ($20 + $2 GST), you get a $2 GST credit on your BAS and a $20 income tax deduction.
GST calculation example
Understanding GST is much easier with a practical illustration.
Imagine you run a graphic design business:
You invoice a client $1,100 for a logo. That price includes $100 GST (i.e. $1,000 + 10%). That same month, you buy $550 worth of software subscriptions. That amount includes $50 GST.
- GST you collected from your client: $100
- GST you paid on your software: $50
- Amount you owe the ATO: $50
You report this on your BAS and pay $50 to the ATO. The $50 GST you paid on software is your input tax credit — you have been reimbursed for it through the system.
GST calculation formulas
- To add GST to a price: multiply by 1.1 (e.g. $1,000 × 1.1 = $1,100)
- To find the GST inside a GST-inclusive price: divide by 11 (e.g. $1,100 ÷ 11 = $100)
Our free online GST calculator lets you instantly determine the exact tax amount owed directly from any total sales amount.
What happens if you don't register for GST when required?
Failing to register is a serious compliance issue.
If you don't register for GST and are required to, you may have to pay GST on sales made since the date you were required to register, even if you didn't include GST in the price of those sales. You may also have to pay penalties and interest.
If you think you have passed the threshold without registering, contact the ATO or a registered tax agent proactively. Voluntary disclosure generally results in more favourable treatment than being caught through an audit.
Applying to backdate your GST registration
If you realise you should have registered earlier, you can apply to backdate your registration. Key things to know:
- Backdating is limited to a maximum of 4 years
- The ATO cannot backdate your registration beyond that period
- You are not required to have been registered before that date, unless there is fraud or evasion
Backdating can work in your favour if you have been paying GST on business purchases but never claimed it back. It can also mean owing the ATO GST on past sales, so calculate the net position carefully before applying.
GST and pricing: How to display prices correctly?
Australian consumer law requires that prices advertised to consumers must be the total price, including GST. You cannot advertise "$100 + GST" to an end consumer — the displayed price must be the full $110.
In business-to-business contexts, it is common practice to show prices excluding GST, with the GST component stated separately on the invoice. Always be clear in your pricing to avoid disputes and ensure your invoices are accurate.
GST record keeping requirements for small businesses
The ATO requires all GST-registered businesses to maintain thorough records. Important records businesses must keep for at least five years include:
- Tax invoices
- Purchase receipts
- Sales records
- Bank statements
- Payroll records
Common GST mistakes that can trigger ATO penalties
Even experienced business owners make GST errors. Here are the most important pitfalls to avoid:
Failing to register on time. Once your projected or current turnover reaches $75,000, you have 21 days to register. Missing this window can result in owing GST on past sales, even money you never collected.
Claiming GST on personal expenses. You can only claim input tax credits for purchases used in your business. Claiming GST on groceries, private travel, or personal items is incorrect and can trigger ATO scrutiny.
Missing BAS deadlines. Late BAS lodgement can lead to ATO penalties, interest charges, or compliance audits. Set calendar reminders well in advance of every due date.
Misclassifying taxable vs GST-free sales. Some food items are taxable (restaurant meals, snacks, takeaway) while others are GST-free (basic unprocessed groceries). Getting this wrong means either overcharging customers or under-reporting to the ATO.
Not holding valid tax invoices. You cannot claim a GST credit without a valid tax invoice for purchases over $82.50. Keep digital copies stored securely in cloud accounting software.
Ignoring the cash flow impact of GST. GST collected is not your money; it belongs to the government. Many small business owners run into cash flow trouble by spending GST funds before the BAS is due. Consider keeping a separate bank account purely to hold the GST you have collected.
Forgetting to update your registration after business changes. If your business structure changes, you relocate, or your turnover drops significantly.
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GST rules for online businesses, exports and ride-sourcing
GST rules apply differently depending on the nature of your business activity. Here are three common situations where special rules apply.
Exports
Goods exported from Australia and services performed for non-Australian recipients are generally GST-free. You do not charge GST, but you can still claim input tax credits on related costs. You will need documentation to prove the goods were exported.
Digital products and online income
Selling digitally to Australian consumers comes with clear GST obligations. If a content creator receives advertising revenue of over $75,000 through a social media platform agreement, they are required to register for GST and pay GST on the payments received.
This applies broadly to:
- Digital products and downloads
- Online courses
- App sales
- Subscription services sold to Australian consumers
Ride-sourcing
If you provide taxi or limousine travel for passengers, including ride-sourcing platforms, you must register for GST regardless of your turnover level. This applies to both owner-drivers and those who lease or rent a taxi. It is a special rule that catches many drivers off guard, so it is worth knowing before you start operating.
GST concessions for small businesses
Small businesses with an aggregated turnover of less than $10 million may be eligible for several GST concessions under Australian tax law, designed to reduce compliance burden and improve cash flow management.
- Cash basis accounting – GST and GST credits are reported in the period when payment is actually made or received, rather than when invoices are issued.
- GST by Instalments – Businesses can pay GST quarterly based on either their own or the ATO's estimate of their liability, with the flexibility to vary the amount each quarter.
- Annual Private Apportionment – Where a purchase is partly for private use, businesses can claim a full GST credit upfront and make a single annual adjustment at year-end to account for the private-use percentage.
Together, these concessions help small businesses manage their tax obligations more efficiently and with greater flexibility.
GST vs BAS: What's the difference?
It is incredibly common to get these two mixed up because they are always mentioned together, but they are actually two completely different things: GST is the tax itself, and the BAS is the form you use to report and pay it.
Think of it like this: if GST is the grocery item you bought, the BAS is the register receipt that totals everything up for the tax office.
Here is exactly how they connect and work together in Australia.
GST (Goods and Services Tax): This is a broad-based 10% tax included in the price of most goods, services, and other items sold or consumed in Australia. If your business turnover is $75,000 or more, you must register for it, add it to your sales, and track what you pay on business expenses.
BAS (Business Activity Statement): This is the actual reporting form issued by the ATO periodically (usually quarterly). It serves as the single place to declare your numbers, offset the GST you paid against the GST you collected, and settle up with the tax office.
GST and BAS example
Imagine you run a business and charge a client $5,500 for a project. Your actual fee is $5,000, and the extra $500 is the 10% GST you collected for the government.
During that same period, you buy a new office chair for $220. The chair cost $200, and you paid $20 in GST to the supplier.
At the end of the quarter, you open your BAS form and do a simple calculation:
$500 (GST Collected) − $20 (GST Paid) = $480 (Net Amount Owed)
You fill out those figures, submit the BAS form, and pay the $480 to the ATO. The BAS simply acts as the paperwork to report and clear your GST balance.
Need professional help with GST registration or BAS lodgements?
Managing GST on your own can be time-consuming, confusing, and costly if things go wrong. That is where CleanSlate comes in.
We are a registered tax agent helping Australian small businesses take control of their GST obligations with confidence. Whether you have just crossed the $75,000 turnover threshold and are not sure where to start, or you have been in business for years and want to make sure everything is in order, our team has the expertise to guide you every step of the way.
Here is what we can help you with:
- GST registration: We handle the entire registration process on your behalf, making sure your effective date is correct and your ABN details are in order.
- BAS preparation and lodgement: We prepare and lodge Business Activity Statements accurately and on time, every quarter, so you never have to worry about missing a deadline or paying unnecessary penalties.
- Input tax credit reviews: Many small businesses miss out on GST credits they are entitled to. We review your expenses and make sure you are claiming everything you legally can.
- Backdating applications: If you should have registered earlier, we can assess your situation and apply to backdate your registration in a way that minimises any liability.
- Ongoing compliance support: Tax rules change. We keep you informed and compliant so there are no surprises from the ATO.
- Cash flow planning around GST: We help you plan ahead so that GST obligations never catch you off guard or strain your business finances.
As a registered tax agent, we are authorised to deal directly with the ATO on your behalf, saving you time and giving you peace of mind.
If you are ready to get your GST sorted properly, reach out to our tax accounting team today. A quick conversation could save you significant time, money, and stress down the track.
GST FAQs
How does the "rolling 12-month" rule work for calculating GST turnover?
You cannot simply wait until the end of the financial year or a standard calendar year to see if you hit the $75,000 threshold. The ATO requires you to measure your gross business income on a continuous rolling basis. Every single month, you must run two tests:
- Current turnover: Your gross income for the current month plus the previous 11 months combined.
- Projected turnover: Your expected gross income for the current month plus the next 11 months based on contract signings, historical trends, or solid pipeline projections.
If either calculation hits or exceeds $75,000, you are legally required to register within 21 days.
Can I use a normal bank transfer receipt or EFTPOS slip to claim a GST credit?
Generally, no, if the purchase is over $82.50 (including GST). For any business expense above this amount, the ATO strictly requires you to hold a valid Tax Invoice from the supplier.
A standard EFTPOS merchant receipt or a bank transaction screenshot shows that money changed hands, but it does not contain the mandatory details required by law, such as the supplier's ABN, a clear breakdown of the GST component, or a statement that the total price includes GST.
If you are audited, the ATO can disallow credits backed only by basic bank receipts.
What happens to my GST accounting methods if my business scales significantly?
While small businesses with an aggregated turnover under $10 million can choose to report GST on a simple cash basis (accounting for GST only when money physically changes hands), scaling past specific operational limits triggers non-negotiable reporting upgrades.
- At a $10 million turnover: You lose the ability to use cash-basis accounting. You must legally switch to an accruals (non-cash) basis, meaning you report GST based on the date an invoice is issued, regardless of whether your client has paid it yet. You must also transition to full BAS reporting, where every individual label is filled out.
- At a $20 million turnover: Your reporting frequency changes entirely. You must exit the standard quarterly cycle and lodge your BAS monthly, which requires much tighter cash flow and administrative discipline.
If I sell property as a developer, do I always have to pay a full 10% GST on the final sale price?
Not necessarily. If you sell new residential premises, commercial premises, or subdivided land as part of your business, you may be eligible to use a specialised accounting method called the Margin Scheme.
Instead of paying 10% GST on the entire final contract price, the scheme allows you to pay GST only on the "margin" — the difference between what you sold the property for and what you originally paid to acquire the property (or its valuation at a specific historical point).
To use this legally, there must be a clear, written agreement between you and the buyer to apply the margin scheme before the date of settlement.
What is the "5-year rule" regarding GST on residential rental properties?
Residential rental income is traditionally classified as an input-taxed supply, meaning a landlord does not charge GST on rent and cannot claim GST back on upkeep expenses. However, if a developer builds brand-new residential premises, selling that property normally triggers a 10% GST liability.
Under the "5-year rule," if the developer instead retains the property and uses it exclusively for continuous residential leasing for a minimum uninterrupted period of five years, the premises lose their "new" status for GST purposes.
If sold after this unbroken five-year window, the sale becomes an input-taxed supply (GST-free), provided the property was not actively marketed for sale during that leasing timeframe.
Are we able to use accounting software to lodge a BAS directly with the ATO?
Yes. Modern cloud platforms like Xero accounting software or QuickBooks accounting software link directly to the tax office using secure government pipelines. Once you verify your automated GST totals, you can securely submit the statement straight to the ATO from inside your system without needing to log into an external tax portal.
Final thoughts on GST
GST does not have to be complicated. Knowing when to register, what you can claim, and when to lodge your BAS puts you in a strong position to manage your business with confidence.
The key is having the right systems in place: reliable accounting software, clean invoicing habits, and a professional you can trust when questions come up. When in doubt, always seek advice rather than guess. The cost of getting it wrong is almost always greater than the cost of getting proper help.
If you are ready to get your GST obligations sorted, our tax accounting team is here to help. Contact us today.
