GST arithmetic
GST amount on a pre-tax value = taxable value × rate ÷ 100. Total price = taxable value + GST. If the amount already includes GST, the tax component is inclusive price × rate ÷ (100 + rate). The right calculation depends on whether your input is before or after tax.
The calculator does not determine the correct GST rate or product classification. Confirm the treatment for the actual transaction using official GST guidance.
Important limitations
This tool performs arithmetic only. It does not identify the correct legal GST classification or rate for your transaction.
Frequently asked questions
Are the results guaranteed?
No. They are estimates based on the values entered and the assumptions described above. Actual outcomes may differ.
Does this include every fee and tax?
No. Review the explanation for this calculator and verify product-specific costs, tax treatment and current rules separately.
What should I do next?
Compare more than one scenario, confirm the inputs and check important figures with the relevant institution or official source before making a financial decision.
For educational and planning purposes only. Not financial, investment or tax advice. Verify current rates, terms and rules before acting.