Create professional GST invoices online for free. Add your business details, add multiple items with quantity and rates, and our tool auto-calculates GST (CGST + SGST or IGST), generates a formatted invoice preview, and even converts the amount to words — ready to print or save.
Perfect for freelancers, small businesses, and shops that need to generate GST-compliant invoices without expensive billing software. Supports all GST rates (5%, 12%, 18%, 28%) and handles both intra-state and inter-state transactions.
How to Use This Calculator
- Fill in your business details and GSTIN.
- Add items with description, quantity, rate, and GST rate.
- Click “+ Add Item” to add more line items.
- Click “Generate Invoice” to see the formatted preview with totals.
Frequently Asked Questions
What details are required on a GST invoice?
A valid GST invoice must include: supplier name and GSTIN, invoice number and date, buyer details, item description with HSN/SAC code, quantity, rate, taxable value, GST rate and amount (CGST+SGST or IGST), and total amount. Our generator includes all required fields.
Do I need GST registration to create invoices?
If your annual turnover exceeds ₹40 lakh (₹20 lakh for services), GST registration is mandatory. Below this threshold, you can issue regular invoices without GST. If registered under composition scheme, different rules apply.
What is HSN code and SAC code?
HSN (Harmonized System of Nomenclature) codes classify goods, while SAC (Services Accounting Code) classifies services. These codes determine the applicable GST rate. Businesses with turnover above ₹5 crore must mention HSN/SAC codes on invoices.