GST Inclusive Calculator
The tag at Officeworks reads $44 for a packet of A4 printer paper. That price is GST inclusive – ACCC rules require it to be – and a $4 sliver of it is GST. The calculator above splits any inclusive total into its GST and ex-GST components in one click. Below we cover what ‘GST inclusive’ actually means, when you’d reach for the split and a couple of worked examples that show the maths.
What does ‘GST inclusive’ mean?
A GST-inclusive price is a price that already has the 10% GST built into it. The customer pays the full figure on the tag, and the GST line sits inside that figure rather than on top.
Most prices Australians see day-to-day are inclusive. The ACCC’s Single Pricing rule requires retailers to display the all-up price to consumers, which means the figure on a Bunnings shelf, a Coles aisle, a JB Hi-Fi product card or a Kmart sign is what you actually pay at the till. There’s no surprise GST line at the register.
Business-to-business pricing is different. Quotes between registered businesses are usually GST exclusive, with ‘plus GST’ or ‘+ GST’ written next to the figure. We’ve broken down the inclusive vs exclusive distinction in detail on the GST inclusive vs exclusive page.
How the calculator splits a GST-inclusive price
Two lines of maths do the work:
- GST in the total: inclusive total ÷ 11
- Ex-GST price: inclusive total ÷ 1.1
- Verification: GST + ex-GST should equal the original total
Dividing by 11 (rather than 10) trips most people up the first time. The reason is structural: the 10% GST has already been added on top of the underlying ex-GST price, so what you’re holding is 110% of the original figure – which makes GST 1/11 of the inclusive total, not 1/10. We’ve covered the formula and the maths in detail on the how to calculate GST page.
Worked examples
$44 Officeworks paper packet (small purchase)
- GST = $44 ÷ 11 = $4
- Ex-GST = $44 ÷ 1.1 = $40
- Verification: $40 + $4 = $44 ✓
$187.50 portion of a Coles receipt (taxable items only)
A weekly shop will mix GST-free items (basic food) with taxable ones (cooked food, soft drink, household items). If the taxable portion of your receipt totals $187.50:
- GST = $187.50 ÷ 11 = $17.05
- Ex-GST = $187.50 ÷ 1.1 = $170.45
- Verification: $170.45 + $17.05 = $187.50 ✓
$1,100 (the textbook example)
The numbers come out unusually clean: $100 GST, $1,000 ex-GST. Real invoices rarely behave this way – more often you’re looking at a number like $437.65 that splits into $39.79 GST and $397.86 ex-GST. The formula doesn’t change.
When you’d use a GST inclusive calculator
The split matters in a handful of situations:
- Expense claims and reimbursements. Sole traders and contractors splitting receipts to record the deductible portion separately from the GST credit.
- Reconciling rideshare or delivery payouts. Uber, DoorDash and Menulog statements often arrive as GST-inclusive totals; the calculator gives you the GST you’ve collected per payout.
- Quote-to-quote comparison. When one supplier quotes inclusive and another quotes exclusive, splitting the inclusive figure puts both on the same footing.
- Spot-checking a tax invoice. If the GST line on a supplier’s invoice doesn’t look right, dividing the total by 11 confirms what it should be.
For dedicated BAS workflows the verb is ‘reverse’ rather than ‘split’ – use our reverse GST calculator for the BAS-prep angle.
GST inclusive vs GST exclusive – which to display?
Two situations decide which version goes on a price:
- Selling to consumers (B2C). The price has to be inclusive. ACCC rules apply across retail, hospitality, online stores and any other consumer-facing context. A Bunnings shelf tag or a JB Hi-Fi product page must show the all-up price.
- Selling to businesses (B2B). Quotes are typically exclusive, with ‘plus GST’ or ‘+ GST’ next to the figure. The customer claims the GST back as a credit, so the underlying ex-GST cost is what they care about.
The grey zone is online stores that sell to both. The cleanest convention: show the inclusive price prominently, then the ex-GST figure underneath in smaller text. That keeps the ACCC happy on the consumer side while giving B2B buyers the figure they need for their books.
FAQs
What does GST inclusive mean?
A GST-inclusive price already has the 10% GST built into it. The figure you see is what you pay – there’s no GST added on top. Most prices Australians see at the till at Coles, Bunnings or JB Hi-Fi are inclusive because ACCC rules require it.
How do I find the GST in a total amount?
Divide the inclusive total by 11. So $220 ÷ 11 = $20 of GST, leaving $200 ex-GST. The reason it’s ÷ 11 and not ÷ 10 is that the 10% has already been added on top, which makes GST 1/11 of the inclusive total rather than 1/10.
Is GST inclusive the same as gross price?
Yes, in most contexts. The ‘gross’ price is the all-up figure including GST, which is the same thing as the GST-inclusive total. The ‘net’ price is the ex-GST figure underneath. Some accounting software uses gross/net language; tax invoices use inclusive/exclusive.
Should my prices be GST inclusive or exclusive?
Depends on who you’re selling to. Consumers must see GST-inclusive prices under ACCC rules – the figure on the shelf or the website is what they pay. Business-to-business quotes are conventionally exclusive (with ‘plus GST’ next to the figure), because the buyer claims the GST back as a credit.
The calculators and guides on gstcalculator.net.au are for general information only and do not constitute tax, financial, or legal advice. Consult a registered tax agent for advice specific to your situation.