About this tool
Calculate GST on an invoice amount and prepare a simple printable invoice estimate. Inputs are processed in your browser unless a page explicitly says that it loads a helper library. ihatecalc provides estimates and utilities for general information; check source rules and assumptions for decisions with financial or legal impact.
Official references
GST e-invoice mandatory fields · GST portal invoice reporting guidance
Frequently asked questions
Can I use this to calculate GST on an invoice?
Yes. Enter the taxable amount and GST rate to estimate the tax and invoice total. For an intra-state sale the tax is commonly split into CGST and SGST; inter-state treatment may differ.
Does this create a GST-compliant tax invoice?
It creates a simple printable estimate, not a verified tax invoice or IRN. Include all legally required fields and follow current GST rules for your transaction.
How do I remove GST from a tax-inclusive amount?
Choose the inclusive calculation mode and enter the total and rate. The tool backs out the embedded GST to estimate the taxable value.