What is a GST Invoice?
A GST invoice is a legal document that a GST-registered business must issue when supplying taxable goods or services. Under the Goods and Services Tax Act of India, every registered taxpayer must generate a proper GST bill that includes the GSTIN of both parties, HSN/SAC codes, item-wise tax breakup, and the total payable amount.
How to Create a GST Bill Online in India?
Creating a GST invoice online has never been easier. With GSTBillGenerator.in:
- Enter your business (seller) details including GSTIN and state
- Add your customer's (buyer) information — GSTIN is optional for B2C sales
- Add your products/services with HSN/SAC codes, quantity, rate and GST percentage
- Our system automatically calculates CGST + SGST or IGST based on states
- Preview your professional invoice and download as PDF — instantly
CGST vs SGST vs IGST — What's the Difference?
CGST (Central GST) and SGST (State GST) are levied on intra-state transactions — when the seller and buyer are in the same state. Both are charged at half the applicable GST rate. For example, on an 18% GST transaction, 9% goes to CGST and 9% to SGST.
IGST (Integrated GST) applies on inter-state transactions — when goods or services cross state boundaries. IGST is charged at the full GST rate and later split between the Centre and destination state.
Our tool automatically detects which tax type applies based on the GSTIN/state of the seller and buyer — no manual calculation needed.
GST Invoice Format Requirements (India)
As per GST rules, a valid tax invoice must contain: the supplier's GSTIN and address, a unique consecutive invoice number, invoice date, recipient details, HSN/SAC codes, taxable value, applicable tax rates, CGST/SGST/IGST amounts, and the total amount payable. Our generator ensures all mandatory fields are included in every invoice.
Free vs Premium GST Invoice Generator
Our free tool lets you generate unlimited GST invoices, download PDFs, and auto-calculate taxes with no login required. The premium plan adds cloud storage, multi-device sync, custom business branding, bulk invoice generation, and monthly GST summary reports — essential for growing businesses.
Frequently Asked Questions
Is this GST invoice generator really free? +
Yes, completely free for unlimited invoices. No registration, no hidden charges, no watermarks. Just create and download your PDF.
How does the tool detect CGST/SGST vs IGST? +
We compare the first 2 digits of the seller's and buyer's GSTIN, which represent the state code. If both states match, we apply CGST + SGST. If they differ, we apply IGST automatically.
Can I save my business details? +
Yes! Click "Save" on the seller section and your business details will be stored in your browser's local storage. Use "Load Saved" any time to restore them — no account needed.
What is an HSN code? +
HSN (Harmonized System of Nomenclature) codes classify goods under GST. SAC codes are used for services. Businesses with turnover above ₹5 crore must use 6-digit HSN codes; others can use 4-digit codes.
Is this invoice legally valid for GST filing? +
The invoice format meets all GST invoice requirements. However, the legal validity depends on the accuracy of information you enter (correct GSTIN, tax rates, etc.). Always verify with your CA for filing purposes.
Can I add my company logo? +
Yes! Click the logo upload area in the Seller section to upload your PNG or JPG logo. It will appear on your invoice preview and PDF.