GST in Australia: What It Is and How It Affects Small Businesses

If you’re running or launching a small business in Australia, sooner or later you’ll run into a three-letter acronym you can’t ignore: GST.

Getting GST right early will save you headaches, cash flow crunches and compliance risk later. The good news? Once you understand the basics in plain English, it’s very manageable.

Below, we’ll explain what GST is, how it works for small businesses, when you need to register, and the practical steps to handle invoicing, BAS, pricing and contracts confidently.

What Is GST (In Plain English)?

Goods and Services Tax (GST) is a 10% tax on most goods and services sold or consumed in Australia. As a business, if you’re registered for GST, you generally:

• Include 10% GST in the price you charge on taxable sales (called “collecting GST”).
• Claim credits for the GST included in the price of business purchases (called “input tax credits”).
• Report and pay the net amount to the ATO, usually quarterly, via your Business Activity Statement (BAS).

GST is designed to be neutral for businesses in the supply chain. The end consumer bears the cost. Your role is to collect, record and remit correctly.

Do You Need To Register For GST?

Whether you must register hinges mainly on your turnover and the nature of your activities.

When Registration Is Compulsory

• Your current or projected GST turnover is $75,000 or more in any 12‑month period ($150,000 for non-profits).
• You provide taxi or ride-sourcing services (including Uber) or limousine travel, regardless of turnover.

Turnover is your gross business income excluding GST, not your profit. If you’re approaching the threshold, it’s safer to register sooner rather than later so you’re not scrambling mid‑quarter.

When Registration Is Optional (But Worth Considering)

Many micro and early-stage businesses register voluntarily to claim input tax credits on setup costs (fit-out, equipment, software). If your customers are mainly other GST-registered businesses (B2B), charging GST usually isn’t a disadvantage to sales because they can claim credits too.

How GST Interacts With Your ABN And Business Activity

To register for GST, you’ll need an ABN and to be carrying on an enterprise (that is, a genuine business activity). If you’re still weighing up your ABN decision, it can help to understand the advantages and disadvantages of having an ABN and what actually counts as a business activity in Australia.

How GST Works Day-To-Day (Invoices, BAS And Record-Keeping)

Once registered, the mechanics are straightforward. The key is consistent processes.

Invoicing: What To Show

If you’re registered for GST, your invoices must meet “tax invoice” requirements when the sale is $82.50 or more (including GST). At a minimum, include your identity/ABN, the date, a brief description of the goods/services, the amount, and a clear statement of the GST component (or that the total includes GST). For mixed supplies, show which line items include GST and which don’t.

Some industries use Recipient Created Tax Invoices (RCTIs), where your customer issues the invoice to you. This is common in sectors like agriculture and freight, but you’ll need a written agreement and to meet specific ATO conditions.

Collecting And Claiming GST

• On taxable sales, you add 10% GST to your price and set aside that amount (e.g. in a separate bank sub‑account) so it’s available when your BAS is due.
• On business purchases, keep tax invoices and receipts so you can claim input tax credits where eligible.
• Some purchases (e.g. bank fees, residential rent) don’t include GST, so there’s no credit to claim.

Lodging Your BAS

Most small businesses lodge quarterly. Your BAS totals GST collected on sales, subtracts GST credits on business purchases, and you either pay the difference to the ATO or receive a refund if your credits exceed your collections. Keeping your bookkeeping up to date makes this painless.

Pricing And Payment Terms

It’s best practice to set clear payment terms that match your cash flow cycle and BAS obligations. Many owners include 7-14 day terms, but choose what suits your margins and customers. If you’re formalising payment expectations in writing, consider aligning your invoicing, due dates and late fee approach with your invoice payment terms and your customer-facing Terms of Trade.

What Can You Claim As GST Credits?

You generally claim credits for the GST included in the price of goods and services used in your business. Common examples include:

• Stock and raw materials.
• Equipment, tools, software and subscriptions.
• Business rent and utilities (commercial premises).
• Professional services (accounting, legal, web development).
• Marketing and advertising costs.

Credits are limited or denied for some expenses (like certain entertainment) and where an item is used partly for private purposes. If an expense is 50% business use and 50% private, you can only claim credits for the business-use portion.

Keep compliant tax invoices and records for five years. This isn’t just good practice - it’s essential if the ATO reviews your BAS claims.

Special GST Scenarios Small Businesses Ask About

Every business is a little different. Here are common situations that change how GST applies.

Importing Goods

If you import stock or equipment, GST may apply at the border based on the customs value. How you claim credits depends on the import pathway and documentation. If this is you, it’s worth reading up on GST on importation so you’re capturing credits correctly and factoring the timing into your cash flow.

Digital Products And Services

Supplying digital products or SaaS to Australian consumers is generally taxable, even if delivered online. If you sell to overseas customers and the goods/services are effectively “used or enjoyed” outside Australia, those sales may be GST‑free - but rules are nuanced, so get advice if a large portion of your sales are cross‑border.

Mixed Supplies (Taxable And GST-Free)

Some products are GST‑free (e.g. many basic foods, certain health services). If your sale includes both GST‑free and taxable components, split the invoice so GST applies only to the taxable items.

Vouchers, Deposits And Cancellations

GST on deposits is usually triggered when you apply the deposit to the sale or keep it (e.g. a non‑refundable cancellation). If you issue vouchers, the point when GST applies depends on whether it’s a “single purpose” or “multi‑purpose” voucher. Your terms should clarify how you handle these scenarios, so you charge (and report) GST correctly.

Recipient Created Tax Invoices (RCTIs)

Where RCTIs are standard in your industry, ensure your written agreement states when RCTIs are used and who is responsible for reporting GST. If your customer will issue RCTIs, they must be registered for GST and comply with the ATO’s rules (so you still receive accurate tax documentation for your BAS).

Pricing, Contracts And Website Terms: Getting The Legals Right

GST doesn’t live in a vacuum - it flows through your prices, quotes, invoices and customer agreements. Setting up your documents correctly from day one reduces disputes and keeps your tax reporting clean.

Should Your Prices Be “GST-Inclusive” Or “Plus GST”?

For consumer-facing pricing, you must display GST-inclusive prices. For B2B, you can quote “plus GST” - but be consistent and clear. A simple rule of thumb: if everyday customers will see it, show the GST-inclusive price.

What To Put In Your Customer Terms

Whether you sell services or products, your standard terms should cover when GST applies, how it’s calculated, and what happens if tax rules change. If you’re issuing quotes, ensure they state whether amounts are inclusive or exclusive of GST to avoid misunderstandings.

If your business trades on standard terms, formalising them in a clear Terms of Trade document helps with consistent GST wording, invoicing triggers and late fee provisions across all customers.

Selling Online? Don’t Forget Your Policies

Online stores should align their checkout, receipts and tax settings with their website legals. Your site should display GST-inclusive prices for Australian customers, and your order confirmations should function as tax invoices where required. It’s also important to publish a compliant Privacy Policy and clear E‑commerce Terms and Conditions that cover pricing, taxes, refunds and delivery.

Payment Terms, Surcharges And Late Fees

Decide on payment windows that support your BAS due dates and cash flow. If you plan to charge late fees or apply card surcharges, spell these out upfront and ensure they’re compliant with pricing and consumer law. Your written invoice payment terms should match what your invoicing software actually enforces.

Common Mistakes To Avoid With GST

We regularly see small businesses tripped up by the same avoidable errors. Here’s what to watch for.

1) Registering Too Late

If you wait until after you’ve crossed the $75,000 threshold, you may need to backdate your registration, issue new tax invoices and pay GST from past sales. It’s stressful and can hit cash flow. Keep an eye on your turnover and register in advance if you’re close.

2) Not Setting Aside The GST Portion

Because GST collected isn’t “your money,” mixing it into working capital can cause pain at BAS time. A simple fix is to transfer 1/11th of each taxable sale into a separate account (or use accounting software that tracks it) so the BAS payment doesn’t come as a surprise.

3) Missing Credits Due To Poor Records

Without a proper tax invoice or where the supplier isn’t registered, you may not be able to claim credits. Build a habit of collecting valid invoices and reconciling monthly.

4) Confusing GST-Free With Input Taxed

GST-free sales don’t include GST, but you can still claim credits on related purchases. Input taxed sales don’t include GST either, but you usually can’t claim related credits. If a portion of your business is input taxed (common in financial services and residential rent), speak with your adviser about apportionment rules.

5) Displaying The Wrong Price

Consumer law requires displaying GST-inclusive prices for retail customers. “$100 + GST” on a website aimed at consumers can attract ACCC attention and customer complaints. Make sure your pricing presentation matches your audience.

6) Overlooking Border and Platform Settings

If you sell into or out of Australia via marketplaces or platforms, check who is “responsible” for GST collection under marketplace rules, and ensure your store’s tax settings handle Australian GST correctly. For imported goods, factor timing and recovery of GST on importation into your margins.

Step-By-Step: Setting Up GST The Right Way

Step 1: Confirm You’re Carrying On A Business

Make sure your activity is a genuine enterprise and that you have (or will apply for) an ABN. If you’re still setting foundations, revisit what counts as a business activity.

Step 2: Register For GST

Register via the ATO online services (using your myGovID) once you decide it’s compulsory or beneficial. Choose your BAS cycle (most small businesses use quarterly) and your accounting method (cash vs accrual).

Step 3: Update Your Pricing And Contracts

Decide whether you’ll advertise GST-inclusive prices or quote “plus GST” for B2B. Align your quotes, invoices and customer agreements. If you rely on standard terms, update your Terms of Trade so GST wording, due dates and late fees are clear.

Step 4: Configure Your Systems

Turn on GST tracking in your accounting software and invoicing tool. Set default tax codes for products/services, and check that receipts and invoices meet tax invoice rules. For online stores, align your E‑commerce Terms and Conditions and checkout tax settings.

Step 5: Build A Rhythm For BAS

Reconcile monthly, file receipts (digitally is fine), and set aside the GST portion regularly. Add BAS lodgement dates to your calendar and consider putting aside funds weekly or fortnightly to smooth cash flow.

Step 6: Review Special Cases

If you import, export, issue vouchers, or use RCTIs, document your approach and check your eligibility and wording. For edge cases (like mixed supplies or platform sales), a quick check with your accountant or a legal adviser can prevent costly corrections later.

FAQs: Quick Answers To “What’s A GST…?” Moments

What’s GST-Inclusive vs GST-Exclusive?

GST-inclusive is the total price a consumer pays (including the 10% tax). GST-exclusive (often written as “+ GST”) adds 10% on top of the stated price. For consumer advertising, show the inclusive price.

Do I Charge GST On Overseas Sales?

Often no, if the sale is exported or consumed outside Australia, but rules vary by product/service and delivery. Keep records proving eligibility for GST‑free treatment.

What’s A Tax Invoice?

A document that meets ATO requirements so the buyer can claim credits (if registered). It shows your ABN, the price, description, GST amount (or a statement that the total includes GST), and other basics depending on the amount and whether the invoice has mixed supplies.

Do I Need Written Terms?

Strong written terms help you manage pricing, GST, refunds, delivery and payment risk. They also make your BAS easier by standardising when a sale is “made” for GST. If you trade on standard terms, a tailored Terms of Trade document brings consistency to every sale.

Key Takeaways

• GST is a 10% tax on most sales in Australia; once registered, you collect GST on taxable sales and claim credits on eligible business purchases.
• You must register when your GST turnover hits $75,000 (or immediately for ride-sourcing); voluntary registration can make sense if you want to claim input credits early.
• Set up compliant tax invoices, clear payment terms and consistent pricing language so your BAS reporting is accurate and cash flow stays steady.
• Watch special scenarios like importation, RCTIs, mixed supplies and vouchers - they change when and how GST applies.
• Align your contracts and online policies with your tax settings, including a Privacy Policy and E‑commerce Terms and Conditions if you sell online.
• Good records and regular reconciliations are essential; they protect your credits and make BAS time straightforward.
• Getting tailored advice on setup, pricing wording and edge cases can prevent expensive rework down the track.

If you’d like a consultation on setting up GST correctly for your small business, you can reach us at 1800 730 617 or team@sprintlaw.com.au for a free, no‑obligations chat.