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 23.58% 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
+6.4 points above the 23.58% global average
Why Reverse Tax Calculation Matters
Receipts and invoices usually show only the tax-included total, so separating revenue from tax collected — for bookkeeping or cross-border comparisons — means working backward from that total. Dividing by (1 + rate) isn't the same as subtracting the rate, which is why selecting "Reverse" in the purchase-mode calculator above handles 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
Extracting GST from a receipt total (reverse)
A receipt shows a A$1,499.00 tax-included total in Australia at 10%:
- Pre-tax price: A$1,499.00 ÷ (1 + 10%) = A$1,362.73
- GST: A$1,499.00 − A$1,362.73 = A$136.27
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
Methodology: headline VAT/GST and corporate rates are sourced from the OECD Corporate Income Tax Rates Database and Tax Foundation's global rate tables for 2026; figures reflect the national statutory rate and do not include sub-national, sector-specific, or temporary rate variations unless noted in the text above. Tax rates change through national budgets — always confirm current figures with a qualified local tax advisor before making business or relocation decisions.
Rates last verified for 2026. This tool is for estimation and educational purposes only and is not tax, legal, or accounting advice.
Jordan Hayes
Verified AuthorPersonal Finance Content Strategist
Jordan is a personal finance content strategist with 9+ years writing about mortgages, retirement, tax strategy, and budgeting. Every guide is cross-referenced with IRS publications, Federal Reserve data, and CFPB guidance to make complex calculations accessible. Editor at CalculatorApp.me.
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Tax-rate data, review & limitations
Jurisdiction: Australia. Effective date: January 1, 2026. Reviewed by CalculatorApp.me editorial staff on July 26, 2026; next scheduled review: October 26, 2026.
Rates are reference estimates, not tax advice. Local rules, exemptions, filing status, and effective dates can change the amount due.
Primary sources
- OECD Tax Database
- Tax Foundation corporate-tax and VAT datasets
- Applicable national revenue authority guidance