Australia Tax Calculator (2026) — Add or Reverse Tax
Australia charges a 10% GST, a 30% corporate tax rate, and a 45% top personal income tax rate.
How to use this calculator:
- Purchase mode — add GST to a pre-tax price, or reverse a tax-included total to find the pre-tax price and exact tax paid.
- Profit / salary modes — enter an amount to see the corporate tax owed or a ceiling estimate of personal tax at the top marginal rate.
Understanding Australia's Tax System
Australia levies GST at a standard rate of 10%. Its statutory corporate income tax rate is 30%, above the 23.37% global average. The top personal income tax rate is 45%.
25% corporate rate for small businesses; 2% Medicare levy on top of personal rate.
Region
Oceania
GST rate
10%
vs. world average corporate rate
+6.6 points above the 23.37% global average
Why Reverse Tax Calculation Matters
Receipts and invoices usually show only the tax-included total — not the pre-tax price. Reversing the calculation matters for bookkeeping, expense claims, and cross-border price comparisons. Because dividing by (1 + rate) isn't the same as simply subtracting the rate, doing this by hand is a common source of errors — select "Reverse" in the purchase-mode calculator above to handle it exactly.
History & Context
Australia introduced its 10% GST on July 1, 2000, replacing the old wholesale sales tax and various inefficient state taxes as part of 'The New Tax System' reform package — one of the most significant overhauls of Australian taxation in decades, deliberately paired with personal and corporate income tax cuts to offset the new consumption tax.
Australia's GST excludes fresh food, health, and education — sectors where government is a major service provider — reflecting a policy choice to keep the consumption tax base broad but not universal, unlike New Zealand's near-total GST base on the same Australasian continent.
Business Use Case
An Australian grocery store sells fresh food GST-free but charges the full 10% GST on prepared and packaged food — a distinction that requires careful point-of-sale categorization, similar to fresh-versus-prepared food rules seen in VAT systems elsewhere in the world.
Real-World Examples
GST on a purchase
A A$1,000.00 purchase in Australia at 10%:
- Tax: A$1,000.00 × 10% = A$100.00
- Total: A$1,100.00
Corporate tax on profit
A$1,000.00 in company profit in Australia at 30%:
- Tax: A$1,000.00 × 30% = A$300.00
- After-tax profit: A$700.00
Frequently Asked Questions — Australia Taxes
What is the GST rate in Australia?▾
What is the corporate tax rate in Australia?▾
What is the top personal income tax rate in Australia?▾
How is tax calculated on a purchase in Australia?▾
How do I reverse Australia's GST to find the price before tax?▾
References & Sources
Rates last verified for 2026. Tax rates change through national budgets — always confirm current figures with a qualified local tax advisor before making business or relocation decisions. This tool is for estimation and educational purposes only and is not tax, legal, or accounting advice.
Jordan Hayes
Verified AuthorLead Content Editor & Personal Finance Specialist
Jordan Hayes is a personal finance content strategist with 9+ years building educational finance and health resources. He has written and fact-checked over 200 personal finance guides covering mortgage amortization, retirement planning, tax strategy, and budgeting. His work applies IRS publications, Federal Reserve data, and peer-reviewed research to make complex calculations accessible.