GST Invoice for Beginners: Complete Guide for New Businesses (2026)
If you recently started a business or registered under GST for the first time, the world of GST invoices can feel overwhelming. This guide cuts through the complexity. By the end, you will know exactly when to issue a GST invoice, what must go on it, and how to create one without any accounting software.
By Arjun Sharma· GST & Tax Compliance Specialist···Reviewed for GST accuracy
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What you get:
GST-compliant PDF
Shareable invoice link
UPI QR on invoice
GSTIN validation
Quick Answer
A GST invoice is required for every taxable supply made by a GST-registered business. You must register for GST if your annual turnover exceeds ₹40 lakh (goods) or ₹20 lakh (services) — lower thresholds apply in special category states. Each invoice must include your GSTIN, the buyer's GSTIN (for B2B), HSN/SAC code, taxable value, and the correct GST split (CGST+SGST for same-state, IGST for different state).
Who Needs to Issue GST Invoices?
Only GST-registered businesses can issue tax invoices and collect GST. If your annual turnover exceeds the registration threshold, you must register under Section 22 of the CGST Act and then issue GST invoices for all taxable supplies.
Business Type
Registration Threshold
Goods supplier (most states)
₹40 lakh annual turnover
Service provider (most states)
₹20 lakh annual turnover
Special category states (NE, hills)
₹10 lakh annual turnover
E-commerce seller
Mandatory regardless of turnover
Interstate supplier
Mandatory regardless of turnover
Bill of Supply vs Tax Invoice — Know the Difference
Not every registered business issues a "Tax Invoice." There are two main documents:
Document
Who Issues
GST on Document
Tax Invoice
Regular GST taxpayer for taxable supply
Yes — CGST/SGST/IGST shown
Bill of Supply
Composition dealer or exempt supply
No — no GST on document
Skip the manual work
Try the Free GST Invoice Generator — No Signup
Instead of manually formatting invoices in Excel, generate GST-compliant invoices instantly — automatic CGST, SGST & IGST calculation, PDF download, and shareable link.
Write "Tax Invoice" at the top — this tells the buyer it is a GST-compliant document
Add your business name, address, and 15-digit GSTIN
Add a unique invoice number (e.g., INV-2026-001) and today's date
Add your buyer's name, address, and GSTIN (for B2B)
List items/services with SAC/HSN code, description, and amount
Add GST — CGST+SGST for same-state buyer, IGST for different-state buyer
Sign the invoice and share PDF with your client
Understanding CGST, SGST, and IGST for Beginners
The most confusing part for beginners. The rule is simple: if your buyer is in the same state as you, split the GST into CGST + SGST. If the buyer is in a different state, charge IGST. The total tax amount is the same either way.
Example
You are in Delhi. Buyer 1 is also in Delhi — charge CGST 9% + SGST 9% (18% total). Buyer 2 is in Mumbai — charge IGST 18%. Same money, different names.
What is GSTIN and How to Get One?
GSTIN (Goods and Services Tax Identification Number) is a 15-digit number assigned when you register under GST. It is PAN-based. The format is: 2 digits (state code) + 10 digits (PAN) + 1 digit (entity number) + 1 digit (Z) + 1 check digit.
Example
GSTIN: 07AABCM1234A1Z5. State code 07 = Delhi. AABCM1234A = PAN. 1 = first entity in that state. Z = always Z. 5 = check digit.
Using an Online GST Invoice Generator
Creating an invoice manually in Word or Excel is error-prone for beginners. Online generators automatically apply the right tax rate, split CGST/SGST vs IGST based on state, and produce a professional PDF ready to send.
No accounting knowledge required
Auto-calculates CGST/SGST vs IGST based on states entered
Validates invoice number format
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No signup required for free tools
FAQs
I just registered for GST. Do I need to issue invoices from day one?
Yes. From the effective date of your GST registration, you must issue tax invoices for all taxable supplies. For supplies made before registration, you cannot charge GST retroactively.
Can I send a WhatsApp photo of my invoice instead of a PDF?
Legally, there is no prescribed format for how the invoice is delivered. However, a clear PDF is far better for record-keeping and audit purposes. Most clients and accountants expect a PDF.
How long should I keep GST invoices?
GST records must be maintained for 6 years from the due date of filing the annual return for that year. Keep both issued and received invoices.
Is there a penalty for not issuing GST invoice?
Yes. Under Section 122(1)(i) of the CGST Act, failure to issue a tax invoice can attract a penalty of ₹10,000 per invoice or 100% of the tax involved, whichever is higher.
Can I issue GST invoice in Excel?
Yes. There is no format restriction. But Excel invoices risk formula errors and manual mistakes. An online generator is faster, error-free, and produces a professional-looking PDF.
Why Businesses Stop Using Excel for GST Invoices
Manual GST calculation mistakes
One wrong CGST/SGST split or a misapplied rate triggers notices and ITC denial for your buyer.
Slow invoice creation
Copying last month's Excel file, updating dates, recalculating — 20 minutes for what should take 30 seconds.
Formatting breaks on every device
Excel invoices look different on every printer and PDF converter. Clients complain about unreadable layouts.
No easy sharing or payment link
Sending PDFs over WhatsApp with no way for clients to pay directly slows down collections.
Incorrect tax type (IGST vs CGST+SGST)
Excel can't auto-detect intra vs inter-state supply. Wrong tax type = ITC rejected for your buyer.
Disclaimer: The information in this article is for general informational purposes only and does not constitute professional tax, legal, or financial advice. GST rules and rates are subject to change. Consult a qualified CA or tax professional before making compliance decisions.
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