GST & Taxes
How to create a GST invoice
Add GST to an invoice by choosing the correct tax treatment, entering the applicable rate, and reviewing the taxable amount and tax breakdown. Local tax rules determine which treatment is correct.
Last updated September 19, 2026
What GST means on an invoice
GST is a consumption tax that may be collected on eligible goods or services. The correct rate, registration details, place-of-supply treatment, and required fields depend on the transaction and the jurisdiction. Online Invoice Studio provides invoice fields; it does not determine your legal tax obligations.
CGST, SGST, and IGST
- CGST and SGST are commonly shown together for an applicable intra-state supply.
- IGST may apply to an applicable inter-state supply or other transaction covered by the relevant rules.
- Use the treatment that matches your registration, customer, place of supply, and current tax guidance.
Tax-inclusive and tax-exclusive pricing
With tax-exclusive pricing, tax is added to the listed taxable amount. With tax-inclusive pricing, the listed amount already contains tax and the taxable value must be derived from it. Confirm which presentation your customer expects before sending the invoice.
GST calculation example
For a taxable subtotal of 10,000 at 18%, tax is 1,800 and the total is 11,800. If the applicable split is 9% CGST and 9% SGST, each component is 900. This is an illustration, not a determination of the rate or treatment for your transaction.
Common GST invoice mistakes
- Using a rate or tax type that does not apply
- Omitting required registration or customer details
- Calculating tax on the wrong subtotal after a discount
- Mixing tax-inclusive and tax-exclusive prices
- Treating software guidance as legal or tax advice