GST is one of the first tax laws a growing business feels operationally. It changes how prices are shown, what invoices say, how checkout works, how refunds and adjustments are handled, and whether cash in the bank is really available to spend.
Main laws
Commonwealth Act
A New Tax System (Goods and Services Tax) Act 1999 (Cth)
The GST Act affects pricing, invoices, BAS reporting, input tax credits and cash-flow planning for Australian businesses.
In forceCommonwealthPlain-English guide5 practical checks
Plain-English explainers, not legal advice. Use the linked official source for section-level detail, and get advice for your situation.
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Quick read
- GST affects pricing, invoices, cash flow and BAS reporting.
- For small businesses, the danger is treating GST as an accounting afterthought instead of building it into quotes, terms, checkout, records and review processes.
Likely relevant if
- Businesses that are registered for GST or approaching registration
- Ecommerce, marketplace, SaaS, consulting, hospitality and retail businesses issuing invoices
- Businesses claiming input tax credits on purchases
Check first
- Check whether GST registration is required or commercially sensible.
- Issue compliant tax invoices and adjustment notes where required.
- Account for GST on taxable supplies and review input tax credit claims.
Start here
Key takeaways
- Check registration early, not after a surprise growth month.
- Make contracts and checkout clear about whether prices include GST.
- Keep tax invoice and BAS records clean enough for review.
Owner checklist
Sense check
- Check whether the business must register for GST before issuing new invoices or launching a channel.
- Decide whether listed prices, quotes and contracts are GST-inclusive or GST-exclusive.
- Set tax invoice rules in accounting software and ecommerce checkout.
- Review input tax credit records before claiming credits.
- Ask your accountant before treating a supply as GST-free, input taxed or outside Australia.
Plain-English glossary
- Taxable supply
- A supply that is subject to GST when the legal requirements are met.
- Input tax credit
- A credit a registered business may be able to claim for GST included in business purchases.
- BAS
- Business Activity Statement, used to report GST and other tax obligations to the ATO.
Common questions
Should this page list the GST registration threshold?
No. Thresholds and special rules can change, and some activities have different registration triggers. Check ATO guidance before relying on a number.
Is GST just an accounting issue?
No. GST can affect contract pricing, tax invoice wording, refunds, adjustments, checkout flows, cash flow and what records the business must keep.
Do online businesses need to think about GST?
Yes. Online sales, subscriptions, digital products, marketplace arrangements, imports and exports can raise GST questions that should be checked before launch.