Do I Need to Charge GST on Everything I Sell?

No. If you're registered for GST, most of what you sell will be taxable and carry GST — but some sales are GST-free (no GST charged, but you can still claim GST credits on related purchases), and others are input-taxed (no GST charged, and generally no credits either). Charging GST on a genuinely GST-free or input-taxed sale is an error, and one the ATO specifically watches for.

• Taxable sales. GST is included in the price, and you can claim GST credits on the purchases used to make that sale. This covers most everyday goods and services.

• GST-free sales. No GST is charged, but you can still claim GST credits on related purchases — common examples include most basic food, many medical and health services, and exports.

• Input-taxed sales. No GST is charged, and you generally can't claim GST credits on the related purchases either — the most common examples are financial supplies and residential rent.

This distinction is covered in full detail, with examples, in its own dedicated guide — this one focuses specifically on how to work out which applies to what you actually sell.

If you're registered for GST, the starting assumption is that your sale is taxable unless it clearly falls into a specific GST-free or input-taxed category set out in the GST law. This matters because it's easy to assume something is GST-free just because it feels essential or basic — many everyday goods and services are still fully taxable, and the exceptions are narrower and more specific than intuition suggests.

• Does this fall into one of the specific GST-free categories — most basic food, certain health and medical services, education, exports, and a handful of others?

• Does this fall into the input-taxed categories — primarily financial supplies or residential rent?

• If neither clearly applies, it's almost certainly taxable, and GST should be included.

• If a single sale mixes taxable and non-taxable elements — a hamper with both taxable and GST-free items, for example — the sale needs to be apportioned, with GST only calculated on the taxable portion.

A café sells fresh bread (generally GST-free), a slice of cake and a coffee (both taxable) in the same transaction. The invoice needs to correctly split GST across only the taxable items — charging GST on the whole sale, including the bread, would be an overcharge; charging no GST at all would understate what's actually owed.

Charging GST on a GST-free or input-taxed sale means you've collected money from your customer that you're not actually entitled to keep as GST — and it still needs to be remitted to the ATO once collected, creating an unnecessary cost for your customer and a compliance headache for you. Failing to charge GST on a genuinely taxable sale, on the other hand, means the GST comes out of your own margin instead, since you can't retroactively add it after the fact.

• Do I know, for each of my main products or services, which of the three categories it falls into?

• Is my accounting software correctly coded for each category, or is everything defaulting to taxable?

• For any mixed sales, am I apportioning GST correctly across taxable and non-taxable components?

• Have I reviewed this recently, particularly if I've added new products or services?

The ATO explains when to charge GST and when not to, with detailed category guidance.

ato.gov.au — When to charge GST (and when not to) https://www.ato.gov.au/businesses-and-organisations/gst-excise-and-indirect-taxes/gst/when-to-charge-gst-and-when-not-to

• you sell a mix of taxable, GST-free or input-taxed items and want your invoicing set up correctly;

• you're launching a new product or service and aren't sure which category it falls into;

• you suspect you've been charging GST incorrectly on some sales; or

• you want your accounting software's GST coding reviewed and confirmed as accurate.

→ GST-Free, Input-Taxed and Taxable Sales — What's the Difference?

→ What Should Be on a Business Invoice — and What Makes an Invoice a Tax Invoice?

→ Understanding BAS — What Am I Actually Reporting and Paying?

SKC Accounting | Knowledge Centre | Knowledge Guide 065

Last reviewed: August 2026

General information only. This guide does not take into account your individual circumstances and is not a substitute for professional accounting, taxation, legal or financial advice.