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GST Calculator
Add or remove GST and see the tax breakdown.
Introduction
GST Calculator provides a fast arithmetic breakdown for inclusive and exclusive price checks. It is useful for draft pricing and invoice review, while official rates, classifications and filings must still be verified separately.
Use cases
- Check how a GST-inclusive selling price divides into taxable value and tax.
- Estimate the displayed price after adding a known GST rate.
- Sanity-check a draft invoice or catalogue price before it is finalised.
Steps
- Enter the amount, GST rate and whether the price includes tax.
- Review the taxable value and tax components shown by the tool.
- Compare the result with the applicable invoice or official guidance.
Example
Practical example
Example: check how an 18% GST-inclusive selling price breaks into taxable value and tax amount before you finalize a listing or invoice.
Limitations
- The correct GST treatment depends on the supply, classification and current law.
- Rounding and invoice rules can affect a final payable amount.
- Use an accountant or official GST guidance for compliance and filing decisions.
Privacy and file processing
Read the Tool Privacy & File Processing Policy before using sensitive files or text.
FAQs
What does GST Calculator do?
Add or remove GST and see the tax breakdown.
What should I check before using the result?
The correct GST treatment depends on the supply, classification and current law.
Can I rely on this for a financial or tax decision?
Use it as a quick estimate and verify important decisions with official documents or a qualified professional.
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Last reviewed: August 7, 2026