Educational guide
How to Invoice in India
GST law defines tax invoices, credit notes, and e-invoice IRN requirements for many registered taxpayers.
This page is for general education only. Tax law, e-invoicing rules, and invoice mandates vary by sector, threshold, and updates from authorities. Confirm requirements with a qualified accountant, lawyer, or government guidance for your situation.
Invoicing in India is governed by the Goods and Services Tax (GST) framework, which requires registered businesses to issue tax invoices containing their 15-digit GSTIN, HSN or SAC codes for each line item, and a detailed tax breakdown showing CGST plus SGST for intra-state transactions or IGST for inter-state supplies. The place of supply is a critical determination — it controls which tax applies and must be explicitly stated on every invoice.
Invoices must follow sequential numbering per financial year, with each number limited to 16 characters. Businesses with aggregate turnover above the notified threshold (currently ₹5 crore, though this has been progressively lowered) must generate e-invoices through the Invoice Registration Portal (IRP), which assigns a unique Invoice Reference Number (IRN) and QR code to each invoice. Without a valid IRN, the invoice is not legally recognized for e-invoicing-applicable businesses.
Payment in INR via UPI, NEFT, or RTGS is standard for domestic transactions. GSTR-1 filing requires invoice-level reporting of all outward supplies, and buyers reconcile their input tax credits through GSTR-2B auto-populated data. Mismatches between supplier filings and buyer records frequently block ITC claims, making data accuracy essential. The MSMED Act mandates payment to registered micro and small enterprises within 45 days of acceptance. Records must be retained for at least six years from the due date of the annual return. India's invoicing requirements are among the most data-intensive globally, and using GST-compliant invoicing software is strongly recommended to ensure correct HSN/SAC classification, tax calculations, and seamless GSTR-1 filing.
Invoice checklist: common fields in India
What buyers, auditors, and tax authorities often expect to see on a commercial invoice. “Required” reflects typical compliance expectations for registered businesses—not every sole trader scenario.
Seller Name & Address
Usually requiredLegal name, address, and GSTIN as registered on the GST portal. If the business has multiple GSTINs across states, use the GSTIN for the state from which the supply originates.
Buyer Name & Address
Usually requiredLegal name, address, GSTIN (for B2B transactions), and state code for determining place of supply. For B2C supplies above ₹2.5 lakh, the buyer's name and address are mandatory.
Invoice Number
Usually requiredUnique sequential number within a financial year, limited to 16 characters including alphanumeric characters, hyphens, and slashes. Numbering must restart or continue logically each April.
Invoice Date
Usually requiredDetermines the time of supply and the GSTR-1 return period in which the invoice must be reported. Late reporting can delay the buyer's ability to claim input tax credits.
GSTIN
Usually required15-digit GST Identification Number where the first two digits indicate the state code. Buyers verify the GSTIN on the GST portal to confirm active registration before processing payments.
Tax Breakdown
Usually requiredTaxable value per item, CGST/SGST or IGST rate and amount, plus HSN codes (for goods, minimum 4-6 digits based on turnover) or SAC codes (for services) on each line item.
Currency
Usually requiredINR for domestic transactions. Export invoices may show foreign currency but must include LUT/bond reference details. GST on exports is zero-rated with proper documentation.
Payment Terms
Often optionalCommercial terms are negotiable, but the MSMED Act mandates payment within 45 days to registered micro and small enterprises. Exceeding this triggers compound interest liability.
Place of Supply
Usually requiredMandatory on all GST invoices as it determines whether CGST+SGST or IGST applies. Incorrect place of supply leads to wrong tax being charged and complications during return filing.
Tax and regulatory themes in India
GST Rates
Four main slabs: 5%, 12%, 18%, and 28%, plus cess on luxury and sin goods. Place of supply determines whether CGST+SGST or IGST applies.
E-Invoicing (IRP)
Mandatory for businesses with aggregate turnover above ₹5 crore (threshold has been lowered progressively). The IRP assigns an IRN and QR code to each invoice JSON.
TDS / TCS under GST
Government agencies deduct TDS at 2% on contracts above ₹2.5 lakh. E-commerce operators collect TCS at 1% on net taxable supplies made through their platforms.
Popular payment methods in India
Methods commonly used for B2B and freelance payments. Availability depends on banks, platforms, and contract terms.
- UPI (Google Pay, PhonePe, Paytm)
- NEFT / RTGS / IMPS bank transfer
- Cheque / demand draft
- Credit/debit cards
- Razorpay / PayU / other gateways
Business and cultural tips for India
- Always include the buyer's GSTIN and correct state code — errors cause ITC mismatches in GSTR-2B reconciliation.
- Large Indian enterprises require vendor codes, PO numbers, and GRN references before AP will process your invoice.
- Clarify whether your quoted price is exclusive of GST to avoid disputes — 18% GST on services is a significant addition.
- Expect requests for digitally signed PDFs or portal-uploaded invoices, especially from government and PSU buyers.
- Include a UPI QR code on your invoices for faster B2B and B2C collections — UPI adoption for business payments is growing rapidly.
- File your GSTR-1 on time every month. Late filing delays your buyer's ITC claims and damages your reputation as a reliable supplier.
- For exports, ensure you have a valid Letter of Undertaking (LUT) on file to supply goods or services at zero GST without paying tax upfront.
- Verify the buyer's GSTIN status on the GST portal before issuing invoices — supplies to cancelled or suspended GSTINs create compliance issues.
Invoicing in India: common questions
Invoicing guides for other countries
Prefer a product overview for this market? See Billed for India.
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