Frequently Asked Questions
What is a GST invoice? ＋
A GST invoice is a document issued by a GST-registered supplier to the buyer showing goods/services supplied, quantities, rates, applicable taxes (CGST+SGST or IGST), and the total amount payable. It is mandatory for claiming Input Tax Credit (ITC).
What details are mandatory on a GST invoice? ＋
Mandatory fields: Supplier name, address, GSTIN; Buyer name, address, GSTIN (for B2B); Invoice number (unique per FY); Date; HSN/SAC code; Description, quantity, unit; Taxable value; GST rate and amount; Total amount; Signature/digital signature.
When should I charge CGST+SGST vs IGST? ＋
Charge CGST+SGST (each at half the GST rate) when supplier and buyer are in the same state. Charge IGST (full GST rate) when supplier and buyer are in different states or for exports. State is determined by the place of supply rules.
What is the HSN code on a GST invoice? ＋
HSN (Harmonised System of Nomenclature) is a 4–8 digit code identifying goods. Businesses with turnover ≥₹5 crore must use 6-digit HSN; ₹1.5–5 crore use 4-digit. SAC codes are used for services. HSN/SAC is mandatory on GST invoices.
Can I create a GST invoice without GSTIN? ＋
If you are not GST-registered (under threshold), you cannot charge GST. If your customer asks for a tax invoice, you can issue a bill of supply without GST. This tool lets you generate both. Reverse charge applies in some B2B cases.