What is the difference between CGST, SGST, and IGST? ▾
CGST and SGST apply to intra-state transactions (seller and buyer in the same state) — each is half the GST rate. IGST applies to inter-state transactions (different states) and equals the full rate. This tool auto-detects which applies based on the states you select.
When should I use Bill of Supply instead of Tax Invoice? ▾
Use Bill of Supply if you are a GST Composition Scheme dealer, or sell exempt/nil-rated goods or services (e.g. books, unprocessed food, healthcare). No GST is charged. For regular taxable supplies, use Tax Invoice.
I'm a freelancer billing an international client — what should I select? ▾
Select a non-INR currency (USD, EUR, GBP, etc.) and set document type to Export Invoice. Exports are zero-rated under Section 16 of the IGST Act — GST is 0%. Your invoice will reflect the foreign currency amount with no tax charged.
What is Reverse Charge Mechanism (RCM)? ▾
Under RCM, the buyer pays GST directly to the government. The seller still issues a tax invoice noting "Tax payable on Reverse Charge." Common cases: legal/advocate fees, goods transport agency (GTA), purchases from unregistered dealers, import of services.
Do I need an HSN or SAC code? ▾
Mandatory if turnover exceeds ₹5 crore. Recommended for B2B invoices above ₹50,000. Optional for smaller businesses and B2C retail. HSN = goods, SAC = services. Common: 9983 (IT/software), 9985 (support services).
How does the UPI QR code work on the invoice? ▾
Enter your UPI ID in the seller section. A QR code encoding your UPI ID and the exact invoice total will be printed at the bottom of the PDF. Your buyer can scan it with any UPI app (Google Pay, PhonePe, Paytm) to pay instantly. Only available for INR invoices.
Is my invoice data stored on your servers? ▾
No. Invoice data is processed in-memory only at the moment of PDF generation and is never stored, logged, or retained. Each download is a one-time operation.