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How to Remove GST from a Total: The Divide-by-11 Rule Explained
Master the divide-by-11 rule to accurately extract GST from any total. This definitive guide covers the maths, practical examples for sole traders, small businesses,…
Free Australian calculators
GST calculators & business tools
Purpose-built tools for Australian GST — from quick calculations to registration, invoices and BAS reporting.
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How to Calculate GST in Australia: The Formula, Step by Step
Master the GST calculation formula for Australia. This definitive guide covers adding and subtracting GST, registration thresholds, GST for importers, and practical examples for…
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Tax Invoice Checker
Check an Australian tax invoice against the exact fields required for its value, supply type and issuer, and flag anything missing.
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BAS GST Estimator
Estimate your BAS: enter sales and purchases to work out G1, 1A, 1B and your net GST payable or refund, with a printable summary.
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GST Registration Threshold Checker
Check whether you must register for GST by testing your current and projected turnover against the $75,000 ($150,000 not-for-profit) threshold.
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Reverse GST Calculator
Reverse the GST on a GST-inclusive price by dividing the total by 11. Enter any amount to see the GST and the price before…
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GST Calculation Errors That Trigger BAS Adjustments
{ “title”: “GST Calculation Errors That Trigger BAS Adjustments: A Definitive Guide”, “slug”: “gst-calculation-errors-bas-adjustments”, “excerpt”: “Discover the most common GST calculation errors that lead…
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Why You Divide by 11 and Not by 10 to Find GST
Understanding why GST is extracted by dividing the total by 11 (not 10) is fundamental for accurate tax calculations. This pillar article explains the…
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How to Calculate GST on a Mixed Invoice with Taxable and GST-Free Items
Learn how to correctly calculate GST on invoices that contain both taxable and GST-free items. This comprehensive guide covers identification of GST-free supplies, step-by-step…
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GST Rounding Rules: How to Round GST Amounts Correctly
Master the ATO's GST rounding rules with this definitive guide. Learn the correct methods for rounding GST on invoices, BAS, and imports, avoid common…