Do I need to register for GST?

You MUST register if your annual turnover is $75,000 or more ($150,000 for non-profits), or if you provide taxi/ride-sharing services regardless of turnover. You CAN voluntarily register below these thresholds. Registration is through the ATO via your ABN.

What items are GST-free?

Major GST-free categories: most basic food (fresh fruit, vegetables, bread, meat, milk), medical and health services, education courses, childcare, exports, water/sewerage, some financial services. Prepared food, confectionery, soft drinks, and restaurant meals DO include GST.

How do I lodge my BAS?

BAS (Business Activity Statement) is lodged quarterly or monthly through myGov/ATO Online, your accountant, or approved software (Xero, MYOB, QuickBooks). Quarterly BAS is due 28 days after the quarter ends. Monthly lodgement is available if you prefer more regular processing.

§ Tool · tier 1 · independent

GST Calculator.

Calculate GST on any amount — add or remove 10% GST instantly. Perfect for invoicing, BAS preparation, and pricing decisions.

CalculatorFree, no signupOn-deviceupd May 2026

Inputs

Your numbers

Awaiting inputs

Move the sliders or type in the form on the left — the math updates live as you go. Click Get AI verdict when you want a written analysis.

GST (Goods and Services Tax) is a 10% tax on most goods, services, and other items sold or consumed in Australia. Whether you're preparing an invoice, checking a supplier's pricing, or lodging your BAS, getting the GST calculation right is essential. This calculator handles all three scenarios: adding GST to a net amount, removing GST from a gross amount, and extracting just the GST component.

§ Worked examples

Real-world scenarios

Adding GST to a Quote

A web designer quotes $5,000 for a project (GST-exclusive).

GST: $5,000 × 10% = $500. GST-inclusive total: $5,500. The invoice should show: Subtotal $5,000 + GST $500 = Total $5,500.

Finding GST in a Receipt

A business owner buys office supplies for $330 (GST-inclusive) and needs to know the GST for their BAS.

GST component: $330 ÷ 11 = $30. GST-exclusive amount: $300. The $30 is claimable as an input tax credit on the next BAS.

§ FAQ

Questions Australians ask

§ Glossary

Plain-English definitions

GST

Goods and Services Tax — a 10% broad-based consumption tax on most goods, services, and other items sold or consumed in Australia.

Input Tax Credit

The GST included in the price of business purchases. GST-registered businesses can claim these credits on their BAS, effectively recovering the GST paid on business expenses.

Tax Invoice

A document issued by a GST-registered supplier showing the price, GST amount, supplier's ABN, and other required details. Required for purchases over $82.50 to claim input credits.

BAS (Business Activity Statement)

A form submitted to the ATO (quarterly or monthly) reporting GST collected, GST paid, PAYG withholding, and PAYG instalments.

§ Pair it with

Related tools

Business Loan Calculator

Calculate repayments on business loans (GST doesn't apply to loan interest).

Invoice Payment Calculator

Calculate invoice amounts including GST and payment terms.

Income Tax Calculator

GST is separate from income tax — calculate both.

How to use

01Enter the dollar amount.
02Choose your calculation type: add GST, remove GST, or find GST only.
03Indicate your GST registration status.
04Optionally select the supply type (some items are GST-free).
05Get instant results with a breakdown.

Key info

GST is 10% of the GST-exclusive price. To find GST in a GST-inclusive price, divide by 11.
GST registration is mandatory if your annual turnover is $75,000+ (or $150,000+ for non-profits).
GST-free items include most basic food, medical services, education, and exports.
Input-taxed supplies (financial services, residential rent) don't include GST, and you can't claim input credits.

Pro tips

Quick mental math: to add GST, multiply by 1.1. To remove GST, divide by 1.1. To find GST only, divide by 11.
Always show GST separately on tax invoices for amounts over $82.50 — your customers need it to claim input credits.
Register for GST voluntarily even under $75,000 if your customers are businesses — they prefer suppliers who are GST-registered.
Lodge your BAS monthly if you get regular GST refunds (more expenses than income) to improve cash flow.

Avoid these

Calculating GST as 10% of the GST-inclusive price — this is wrong. GST on $110 inclusive is $10 (÷11), not $11 (×10%).
Charging GST when you're not registered — you cannot charge GST unless you have a valid ABN and GST registration.
Forgetting to claim input tax credits on business purchases — every GST-inclusive purchase is a tax credit waiting to be claimed.
Not issuing proper tax invoices — without a valid tax invoice, your customers can't claim the GST credit.

Disclaimer: Estimates only. Interest rates, fees and policies change frequently. Always verify with lenders directly. General information, not personal financial advice.

Last updated · May 2026