When you export goods from India to a buyer in another country, the invoicing rules change significantly under the Goods and Services Tax (GST) regime. Export invoices operate under a fundamentally different framework compared to domestic invoices, involving zero-rated supplies, specific documentation requirements, and special tax treatment mechanisms.

This comprehensive guide explains every aspect of export invoicing under GST, including the legal provisions, mandatory fields, procedural options, practical implementation steps, and common pitfalls to avoid.

What is an Export Invoice Under GST?

An export invoice is a commercial document issued by a GST-registered Indian exporter to a foreign buyer for the international shipment of goods. Unlike domestic invoices that must comply with Rule 46 of the Central Goods and Services Tax Rules, 2017, export invoices follow a specialized set of rules designed to facilitate zero-rated supply treatment.

Legal Basis: The authority for export invoicing comes from Section 31 of the Central GST Act, 2017, which defines "supply to a person outside India" as an export supply. According to this provision, goods are considered "exported" when they cross the customs frontier of India with the intention of permanent removal from Indian territory.

When is an Export Invoice Required? An export invoice becomes necessary when:

• A GST-registered person supplies goods to a buyer located outside Indian territory
• The goods are physically removed from India through legal customs procedures
• The buyer is not a registered GST entity within India (or is registered but located abroad)
• Payment is to be received in foreign currency or through authorized foreign exchange channels

Key Differences Between Export and Domestic Invoices

Export invoices differ from domestic invoices in several critical aspects:

Place of Supply Rules

In domestic supply, the place of supply is determined by the location of the recipient or service recipient in India. For exports, the place of supply is the destination country where the buyer is located. This fundamental difference affects HSN code classification, tax rate determination, and filing requirements in GST returns (GSTR-1 and GSTR-3B).

Currency and Exchange Rate

Domestic invoices must be issued in Indian Rupees (INR). Export invoices can be issued in the buyer's foreign currency (USD, EUR, GBP, etc.), provided the exchange rate used is notified by the Reserve Bank of India (RBI) for that particular date of supply. The invoice must clearly state the exchange rate and the base date used for conversion.

Tax Rate Application

Domestic supplies attract GST at the standard rate applicable to the product category (typically 5%, 12%, or 28%, with some items at 0% like food grains). Export supplies are strictly zero-rated, meaning 0% GST is charged on the supply itself. However, a critical distinction exists between two export mechanisms:

• Export under LUT/Bond: No GST is charged on the export supply from the point of invoice
• Export with IGST payment: IGST (Integrated GST) is charged on the export invoice, with the exporter entitled to claim a full refund of the IGST paid through Form RFD-01

Input Tax Credit and Refunds

For domestic supplies, businesses can claim input tax credit on GST paid on purchases of raw materials and services. For exports, GST laws provide two pathways:

1. Zero-rated supply with LUT/Bond: The exporter can claim refund of input GST without paying any output GST. The refund is processed under Rule 96 of the GST Rules through Form RFD-11.
2. Zero-rated supply with IGST payment: The exporter pays IGST on the invoice and claims a refund through Form RFD-01, which is processed within 90 days.

LUT (Letter of Undertaking) Requirement

A Letter of Undertaking is a formal commitment submitted by an exporter to the GST authorities, declaring that they will not claim GST refund on inputs and will instead receive zero-rated supply treatment without paying any tax on the export. LUT is valid for a specified period (typically 12 or 24 months) and must be renewed before expiry. This eliminates the need to pay IGST upfront and wait for refunds.

Two Options for Export Tax Treatment

Option 1: Export Under LUT or Bond (Zero-Rated, No Tax Charged)

This is the preferred route for most exporters. Under this option:

• The exporter submits Form GST RFD-10 (Letter of Undertaking) to the GST authority
• No GST (neither CGST, SGST, nor IGST) is charged on the export invoice
• The invoice clearly states: "Supply meant for export under LUT without payment of IGST"
• Input GST paid on purchases can be claimed as refund through Form RFD-11
• No refund wait period—the input credit is adjusted immediately
• The exporter must maintain a bond through the Customs authority or provide a bank guarantee, depending on the nature of supply

Advantages: No cash outflow for GST; faster refund process; cleaner accounting; reduced working capital requirement.

Disadvantages: LUT must be renewed periodically; requires bond/guarantee compliance; cannot claim benefits if conditions of LUT are violated.

Option 2: Export With IGST Payment (Charge IGST, Claim Refund)

Under this option:

• IGST is charged on the export invoice at the applicable rate
• The invoice clearly states: "Supply meant for export on payment of IGST"
• The exporter pays the full IGST amount to the GST authority
• Within 90 days, a refund application is filed using Form RFD-01
• The GST authority verifies the claim and processes the refund
• No LUT or bond is required for this mechanism

Advantages: No LUT documentation; no bond requirement; straightforward process; applicable to all export categories.

Disadvantages: Requires paying IGST upfront; 90-day refund processing time; cash flow impact; interest earned on refund (if delayed beyond 90 days) is low.

Mandatory Fields on Export Invoices

Export invoices must include all standard Rule 46 fields required for domestic GST invoices, with specific additions for export transactions. The complete list includes:

Standard Rule 46 Fields (As Applicable to Exports)

• Sequential Invoice Number: Unique identifier following a continuous numbering pattern
• Date of Invoice: Date on which the invoice is generated (must not be after the date of supply)
• Supplier Name, Address, GSTIN: Full details of the Indian exporter with valid GSTIN
• Recipient Name and Address: Full details of the foreign buyer (GSTIN not applicable; mention registration number if any)
• HSN Code and Description: Harmonized System of Nomenclature code for each item; detailed product description
• Quantity and Unit: Quantity of goods supplied with the unit of measurement
• Unit Price and Amount: Price per unit and total value before tax
• Tax Rate and Amount: Clearly showing 0% GST or applicable IGST (if using Option 2)
• Signature of Authorized Person: Authorized representative's signature or digital signature

Export-Specific Mandatory Fields

• Shipping Bill Number and Date: The document number issued by Customs at the port of export, essential for proof of physical export
• Port of Loading/Shipment: The specific port, airport, or land border where goods are exported from India
• Destination Country: The name of the country where goods are being shipped (must match the shipping bill)
• Currency of Invoice: The currency in which the invoice is issued (USD, EUR, GBP, etc.)
• Exchange Rate and Rate Determination Date: If issued in foreign currency, the RBI-notified rate and the date to which the rate applies
• Tax Treatment Declaration: A clear statement such as:
  • "Supply meant for export under LUT without payment of IGST" (for Option 1), OR
  • "Supply meant for export on payment of IGST" (for Option 2)
• Net Quantity and Weight: Especially for exports, the actual quantity of goods exported must be clearly mentioned
• Incoterms: The agreed terms of delivery (FOB, CIF, etc.) should be mentioned for clarity

Step-by-Step: How to Create an Export Invoice

Step 1: Prepare Pre-Export Documentation

Before issuing the invoice, ensure you have:

• Valid GST registration certificate
• Active LUT (if using Option 1) or IGST payment authorization (if using Option 2)
• Valid PAN and import-export code (IEC) from the Directorate General of Foreign Trade (DGFT)
• Written purchase order or contract from the buyer
• Proforma invoice confirmation (if required by buyer)

Step 2: Obtain Shipment and Customs Details

Arrange goods for shipment and obtain the following details from the shipping line and Customs:

• Shipping Bill Number (issued after filing shipping bill with Customs)
• Date of Shipping Bill
• Port of Loading (the specific port/airport from which goods are exported)
• Bill of Lading/Airway Bill Number (for tracking)

Step 3: Determine Invoice Date and Exchange Rate

The invoice date must be on or before the date of shipment as per Customs records. If issuing in foreign currency:

• Visit the RBI website for the notified exchange rate on the date of supply
• Clearly mention the date to which the exchange rate applies
• Include both the foreign currency and INR equivalent amounts

Step 4: Draft the Invoice with Complete Details

Prepare the invoice document containing:

• All standard rule 46 fields (as listed above)
• Complete buyer details with address (not GSTIN, but business registration if available)
• HSN codes for each item with precise descriptions
• Quantity, unit, and unit price of each item
• Shipping bill number and port of loading
• Tax treatment declaration (LUT or IGST payment)
• Destination country (as per shipping bill)

Step 5: Issue and Sign the Invoice

The invoice must be:

• Signed by the person authorized to issue invoices under GST norms
• Generated in duplicate (original for buyer, duplicate for GST records)
• Issued before or on the same date as the shipping bill filing

Step 6: Record in GST Returns (GSTR-1)

When filing GSTR-1 (monthly outward supply return):

• Report the export invoice in the "B2X" (supply to non-residents) section
• Mention the shipping bill number
• Specify whether the supply is under LUT or with IGST payment
• Ensure the invoice details match the shipping bill filed with Customs

Step 7: File Input GST Refund (if applicable)

Once the export shipment is confirmed:

• For LUT exports: File Form RFD-11 for refund of input GST without payment of output GST
• For IGST payment exports: File Form RFD-01 within 90 days to claim refund of IGST paid on the export invoice

Common Mistakes in Export Invoicing

Many exporters inadvertently make errors that lead to GST compliance issues, refund delays, or customs rejection. Understanding these common mistakes helps ensure smooth export operations:

Mistake 1: Charging GST on Export Invoices

Some exporters mistakenly charge CGST/SGST on export invoices instead of zero-rating the supply. This violates the zero-rated supply principle and creates mismatch with Customs records. Always show 0% tax on export invoices under LUT, or explicitly mention IGST with the intent to claim refund.

Mistake 2: Missing LUT or Not Renewing It

Issuing export invoices without an active LUT means you cannot claim the zero-rated benefit. The supply will be treated as taxable, and you'll face refund delays of 2-3 months. Check LUT validity before issuing each export invoice.

Mistake 3: Omitting or Incorrectly Stating Shipping Bill Number

The shipping bill number is the link between the invoice and Customs records. Without it, Customs cannot verify the export, and refund claims will be rejected. Never issue an export invoice without the shipping bill number.

Mistake 4: Wrong Place of Supply

Stating India as the place of supply instead of the destination country creates a mismatch in GST return filing. Always specify the foreign buyer's country as the place of supply.

Mistake 5: Incorrect Exchange Rate or Currency Conversion

Using non-RBI-notified exchange rates or omitting the conversion date invalidates the invoice. Always use the RBI-notified rate for the date of supply and clearly document it.

Mistake 6: Using Foreign GSTIN Instead of Registration Number

Foreign businesses do not have Indian GSTINs. Using a made-up GSTIN is incorrect. Use the buyer's business registration number or tax identification number from their country instead.

Mistake 7: Mismatch Between Invoice and Shipping Bill

If the quantity, value, or description in the invoice does not match the shipping bill, Customs may reject the shipment or reduce the refund claim. Cross-check all invoice details with the shipping bill before issuance.

Critical Compliance Note: Export invoicing involves interaction with both GST and Customs authorities. Non-compliance can result in goods being held at the port, refund denial, penalty under Section 122 of CGST Act, or criminal prosecution in egregious cases. It is strongly recommended to consult with a qualified Chartered Accountant or GST practitioner before initiating export operations.

Export Invoice Generation via GSTBill.app

Manual creation of export invoices is time-consuming and error-prone, especially when managing multiple shipments with different currencies and exchange rates. GSTBill.app provides a specialized solution for generating GST-compliant export invoices with all mandatory fields pre-configured.

Our platform enables you to:

• Generate export invoices with Rule 46 compliance and export-specific fields
• Automatically populate shipping bill details and Customs references
• Calculate exchange rates based on the date of supply
• Select between LUT and IGST payment tax treatment options
• Generate both original and duplicate copies for different stakeholders
• Maintain a digital archive of all export invoices for audit purposes

Whether you're an established exporter or scaling your international business, proper export invoicing is the foundation of GST compliance and timely refund realization. Our tools are designed to simplify this process and reduce administrative burden.

Frequently Asked Questions