When must the export invoice be issued?

For goods, on or before the date of removal of goods for export. For services, within 30 days of the supply.

Export Import GST Invoicing 2026 – Complete Guide to Export Invoice Format & Import Tax Invoice

Step-by-step guide covering export invoice format under GST, mandatory declarations, invoice cum bill of supply, import invoice via Bill of Entry, ITC on imports, invoice numbering rules, time limits, and common invoicing errors. Get your international trade invoices right the first time.

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Quick Summary – Export Import GST Invoicing

Export Invoice Type: Tax Invoice (if IGST paid) or Invoice cum Bill of Supply (if exported under LUT/Bond without IGST).
Mandatory Declaration: Either "SUPPLY MEANT FOR EXPORT ON PAYMENT OF IGST" or "SUPPLY MEANT FOR EXPORT UNDER BOND OR LETTER OF UNDERTAKING WITHOUT PAYMENT OF INTEGRATED TAX."
Export Invoice Numbering: Consecutive serial number, maximum 16 characters, unique for the financial year.
Import Invoice: The Bill of Entry acts as the tax invoice for imports. IGST paid flows to GSTR-2B for ITC claim.
Governing Rules: Rule 46 of the CGST Rules, 2017 for invoice contents; Section 31 for time of issue.
Time Limit for Export Invoice: On or before the date of removal of goods for export.
Time Limit for Import Invoice: Bill of Entry is filed on ICEGATE before vessel arrival.
Currency: Export invoices may be in foreign currency; INR conversion at RBI reference rate is required for GST reporting.
Signing: Digitally signed or physically signed by the authorised signatory. Electronic invoicing (e-invoicing) applies based on turnover threshold.
Government Fee: Nil — no government fee for issuing or filing trade invoices.

Takeaway: An export or import invoice is not just a commercial document — it is a GST compliance document. One missing declaration or one wrong field can block your refund and trigger a Customs query.

1. Introduction – Why Export Import GST Invoicing Matters

In domestic trade, an invoice is a tax document. In international trade, it is something more — it is a legal contract, a customs declaration, a GST compliance record, and the foundation of your refund claim. Every field on an export or import invoice carries weight.

India's GST framework treats exports as zero-rated supplies and imports as taxable supplies. This means the invoicing rules are different from domestic transactions. An export invoice must carry a specific declaration to establish that the supply is either made with payment of IGST or without payment under LUT. An import transaction does not involve a supplier-issued GST invoice at all — the Bill of Entry filed with Customs serves as the tax invoice.

Getting the invoice right at the point of issuance determines whether your GST refund flows smoothly, whether your ITC claim is accepted, and whether your customs clearance is delayed or smooth.

This guide covers the complete invoicing framework for exports and imports — formats, declarations, numbering, currency, signing, time limits, and common errors.

Takeaway: Invoicing is the first step of GST compliance and the last defence during audit. Master the format, and everything downstream gets easier.

2. Types of Export Invoices Under GST

There are two types of export invoices depending on the route chosen for the export. Both are valid, but each carries a different declaration and different GST implications.

Invoice Type	When Used	GST Charged	Declaration Required
Tax Invoice	Export with payment of IGST	Yes — IGST at applicable rate	"SUPPLY MEANT FOR EXPORT ON PAYMENT OF IGST"
Invoice cum Bill of Supply	Export without payment of IGST (under LUT or Bond)	No — IGST not charged	"SUPPLY MEANT FOR EXPORT UNDER BOND OR LETTER OF UNDERTAKING WITHOUT PAYMENT OF INTEGRATED TAX"

Tax Invoice – For Exports with IGST

Used when the exporter does not have an LUT or Bond, or chooses to pay IGST upfront. The invoice is issued like a normal tax invoice, with IGST charged at the applicable rate. The IGST amount is later claimed as a refund through the GST portal.

Invoice cum Bill of Supply – For Exports Under LUT

Used when the exporter has filed an LUT and wants to export without paying IGST. This is the preferred route for most exporters because it avoids working capital blockage. The invoice carries no IGST but includes the mandatory declaration.

Example – Choosing the Right Invoice Type: An exporter of textiles ships goods worth ₹25 lakh to the UK. If they file an LUT, they issue an Invoice cum Bill of Supply with the declaration "SUPPLY MEANT FOR EXPORT UNDER BOND OR LETTER OF UNDERTAKING WITHOUT PAYMENT OF INTEGRATED TAX." No IGST is charged, and no working capital is blocked. If they do not file an LUT, they must issue a Tax Invoice charging IGST at 5% (₹1.25 lakh), pay it upfront, and then claim refund — blocking ₹1.25 lakh for months.

Takeaway: Always prefer the Invoice cum Bill of Supply route with LUT. It eliminates the cash flow burden and simplifies compliance.

3. Export Invoice Format – Mandatory Fields

Rule 46 of the CGST Rules, 2017 prescribes the mandatory fields for every tax invoice. Export invoices must contain all of these fields, plus the export-specific declaration.

Mandatory Fields on an Export Invoice

Invoice number and date in consecutive serial order
Exporter's name, address, GSTIN, and IEC number
Name and address of the foreign buyer (recipient)
Shipping address and destination country
HS code and description of goods
Quantity, unit of measurement, and rate per unit
Total value in foreign currency and INR
Applicable exchange rate and its source
Incoterms (FOB, CIF, EXW, etc.)
Port of loading and port of discharge
Place of supply (outside India for exports)
Whether IGST is payable — Yes or No
LUT number (if exporting without payment of IGST)
Bank details and AD Code
Shipping bill number and date (once filed)
Signature of authorised signatory or digital signature
Mandatory export declaration (see below)

The Two Mandatory Export Declarations

If IGST is paid: "SUPPLY MEANT FOR EXPORT ON PAYMENT OF INTEGRATED TAX."
If IGST is not paid (LUT route): "SUPPLY MEANT FOR EXPORT UNDER BOND OR LETTER OF UNDERTAKING WITHOUT PAYMENT OF INTEGRATED TAX."

Additional Recommended Fields

📌 Purchase Order Reference: Buyer's PO number for reconciliation
📌 Payment Terms: LC, TT, DA, DP, or open account
📌 Container and Seal Numbers: For shipments in containers
📌 Package Count and Gross/Net Weight: For customs verification
📌 Country of Origin: "India" declaration
📌 Declaration of Truth: "We declare that this invoice shows the actual price of the goods described and that all particulars are true and correct."

Note: The invoice number must be unique for the financial year and must not exceed 16 characters. Using the same invoice number for two different invoices — even years apart — is a compliance violation.

Takeaway: A complete export invoice is a self-contained document. If a Customs officer or GST auditor has to ask you for additional details, your invoice format needs revision.

4. Import Invoicing – How the Bill of Entry Acts as Tax Invoice

Imports do not involve a supplier-issued GST invoice. The foreign supplier issues a commercial invoice, but for GST purposes, the Bill of Entry (BoE) filed with Customs serves as the tax invoice. This is a critical distinction that many importers miss.

What the Bill of Entry Contains as a Tax Invoice

Field	Purpose
BoE Number and Date	Acts as the invoice number for GST purposes
Importer's GSTIN	Ensures ITC flows to the correct GSTIN in GSTR-2B
Supplier Name and Country	Identifies the foreign supplier
HS Code and Description	Classification for duty and GST purposes
Assessable Value	CIF value plus landing charges — the base for IGST calculation
IGST Amount	Available as Input Tax Credit in the recipient's GSTR-2B
Compensation Cess	Applicable for certain goods; also available as ITC
BCD and SWS	Not available as ITC — these are cost items
Out of Charge Date	Determines the tax period in which ITC can be claimed

Foreign Supplier's Commercial Invoice – What It Must Contain

📌 Supplier's Name and Address: Full details of the foreign seller
📌 Invoice Number and Date: Unique reference for the transaction
📌 Buyer's Name and Address: The Indian importer's details
📌 Description of Goods: Technical specification and HS code
📌 Quantity and Unit Price: Basis of value calculation
📌 Total Value and Currency: FOB, CIF, or other Incoterms basis
📌 Incoterms: Determines freight and insurance allocation
📌 Country of Origin: For preferential duty claims
📌 Payment Terms: LC, TT, DA, DP details

ITC Claim on Imports – The Invoice Flow

1 Foreign Invoice Received: Supplier issues commercial invoice with all transaction details.

2 BoE Filed on ICEGATE: Importer declares GSTIN, HS code, value, and pays IGST.

3 Out of Charge Granted: Customs clears the goods; IGST payment is pushed to the GST system.

4 GSTR-2B Auto-Populated: The BoE details appear in GSTR-2B within 1-2 days.

5 ITC Claimed in GSTR-3B: The IGST amount is available in the Electronic Credit Ledger.

Example – Import Invoice Flow: An importer brings in electronic components from Taiwan. The foreign supplier's invoice is USD 10,000 (CIF). The importer files a Bill of Entry declaring GSTIN, HS code, and assessable value of ₹8,30,000. BCD of ₹83,000, SWS of ₹8,300, and IGST of ₹1,65,834 are assessed. The importer pays ₹2,57,134 from their Electronic Cash Ledger. On Out of Charge, the IGST of ₹1,65,834 flows into GSTR-2B as Input Tax Credit.

Takeaway: For imports, the Bill of Entry IS the invoice. Do not look for a supplier-issued GST invoice — it does not exist. Ensure the BoE is filed with the correct GSTIN for ITC to flow.

5. Invoice Numbering, Time Limits & Currency Rules

GST law prescribes specific rules for invoice numbering, time of issuance, and currency handling. Non-compliance can lead to penalties and refund rejection.

Invoice Numbering Rules

Consecutive Serial Number: Each invoice must carry a unique, consecutive serial number.
Maximum Length: The invoice number cannot exceed 16 characters.
Financial Year Series: The series must be unique for a financial year and cannot repeat.
No Gaps: Missing invoice numbers invite scrutiny during audit.
Alphanumeric Allowed: Numbers can include alphabets, slashes, and hyphens, but total length must stay within limits.

Time Limit for Issuing Export Invoice

Scenario	Time Limit
Goods Exported	On or before the date of removal of goods for export
Services Exported	Before or after the provision of service, but within 30 days of the supply
Continuous Supply of Services	Before or at the time of each payment, or as agreed in the contract

Currency Handling on Export Invoices

📌 Foreign Currency Invoice: Export invoices are typically issued in USD, EUR, GBP, or other foreign currency.
📌 INR Conversion: For GST reporting, the invoice value must be converted to INR.
📌 Exchange Rate: Use the RBI reference rate on the date of invoice, or the rate notified by CBIC if applicable.
📌 Dual Currency: Best practice is to show both foreign currency and INR value on the invoice.
📌 Consistency: Use the same conversion rate across shipping bill, invoice, and GST return.

Example – Invoice Numbering: An exporter uses the series "EXP/2026-27/001" through "EXP/2026-27/999." Each number is unique, consecutive, and within 16 characters. When they need a corrective invoice, they use a suffix like "EXP/2026-27/045-A" rather than overwriting or deleting the original.

Takeaway: Invoice numbering and time limits are not optional formalities. Non-compliance invites penalties and can invalidate your refund claim.

6. E-Invoicing for Exports – Is It Applicable?

Electronic invoicing (e-invoicing) under GST is mandatory for businesses with aggregate annual turnover exceeding the notified threshold. For exporters, e-invoicing has specific nuances that need careful handling.

Applicability of E-Invoicing

✅ Threshold-Based: Applicable to businesses whose aggregate turnover exceeds the notified limit.
✅ Export Transactions: E-invoicing applies to export invoices when the exporter's turnover exceeds the threshold.
✅ IRN Generation: Each invoice must be reported to the Invoice Registration Portal (IRP) to obtain an Invoice Reference Number (IRN).
✅ QR Code: A signed QR code must be printed on the invoice.
✅ SEZ Supplies: Applicable to supplies made to SEZ units and developers.

Exemptions from E-Invoicing

Exporters with turnover below the notified threshold
Supplies to SEZ under specific exempt categories as notified
Certain categories of taxpayers specifically exempted under notification

Best Practices for E-Invoicing on Exports

📌 Integrate Systems: Connect your ERP or invoicing software with the IRP for automatic IRN generation.
📌 Generate IRN Before Shipping: Generate the IRN before filing the shipping bill to avoid mismatches.
📌 Print QR Code: Ensure the QR code is printed on the physical or digital invoice sent to the buyer.
📌 Reconcile: Reconcile the IRN data with GSTR-1 and GSTR-2B data every month.
📌 Train Staff: Ensure your invoicing team knows the e-invoicing process and IRP integration.

Example – E-Invoice on an Export Consignment: An exporter with ₹15 crore turnover ships goods worth ₹8 lakh. They generate the e-invoice on the IRP, obtain the IRN and QR code, print the invoice with the QR code, and then file the shipping bill referencing the IRN. The buyer receives the invoice with the QR code and IRN displayed prominently.

Takeaway: E-invoicing is now the standard for most medium and large exporters. Prepare your systems early to avoid last-minute compliance panic.

7. Common Export Import Invoicing Errors & Solutions

These are the most common mistakes seen in trade invoicing — and how to fix each one.

Error 1: Missing Export Declaration The invoice does not carry the mandatory declaration for export supply, causing GST refund rejection. Add the exact declaration as prescribed — "SUPPLY MEANT FOR EXPORT ON PAYMENT OF INTEGRATED TAX" or "SUPPLY MEANT FOR EXPORT UNDER BOND OR LETTER OF UNDERTAKING WITHOUT PAYMENT OF INTEGRATED TAX."

Error 2: No LUT Number on Invoice Invoice issued without mentioning the LUT number, making the declaration ineffective. Always quote the LUT number prominently on the export invoice when exporting without payment of IGST.

Error 3: Duplicate Invoice Numbers Same invoice number used twice across different periods, violating GST rules. Maintain a single invoice numbering series across the financial year. Use a proper ERP or accounting software to enforce uniqueness.

Error 4: No Invoice Numbering Sequence Invoice numbers do not follow consecutive serial order, inviting audit scrutiny. Follow a strict consecutive numbering series. If gaps occur, document the reason in a controlled register.

Error 5: Wrong GSTIN on Import BoE Incorrect GSTIN entered on the Bill of Entry, blocking ITC. Verify the GSTIN before every BoE filing. If already filed incorrectly, use the Search BoE feature on the GST portal and file an amendment.

Error 6: Value Mismatch Between Invoice and BoE Foreign invoice value differs from the assessable value declared on the BoE. Reconcile CIF value, freight, and insurance before filing. The BoE assessable value must be consistent with the commercial invoice.

Error 7: Missing HS Code Invoice and shipping bill / BoE do not carry the correct HS code, leading to customs queries. Always mention the 8-digit HS code on the commercial invoice. Verify against the current Customs Tariff.

Error 8: Wrong Currency Conversion Invoice in foreign currency converted at an incorrect exchange rate, causing GST reporting errors. Use the RBI reference rate on the invoice date. Apply the same rate consistently across the shipping bill and GSTR-1.

Error 9: Not Issuing Invoice Before Shipment Export invoice issued after the goods have been shipped, breaching the time limit under Section 31. Issue the export invoice on or before the date of removal of goods for export. Build this into your dispatch checklist.

Error 10: E-Invoice Not Generated Export invoice issued without IRN despite the turnover threshold being breached. Generate the IRN on the IRP before issuing the invoice. Ensure your software is integrated with the IRP to prevent oversight.

Takeaway: Invoicing errors at the point of issuance cascade into refund delays, customs queries, and audit notices. Build an invoice template with all mandatory fields — and verify before dispatch.

8. Frequently Asked Questions – Export Import GST Invoicing

There are two types: a Tax Invoice (if exporting with payment of IGST) or an Invoice cum Bill of Supply (if exporting without payment of IGST under LUT/Bond).

Either "SUPPLY MEANT FOR EXPORT ON PAYMENT OF INTEGRATED TAX" (if IGST is paid) or "SUPPLY MEANT FOR EXPORT UNDER BOND OR LETTER OF UNDERTAKING WITHOUT PAYMENT OF INTEGRATED TAX" (if exporting under LUT).

No — for imports, the Bill of Entry filed with Customs serves as the tax invoice. The foreign supplier issues a commercial invoice, but the BoE is the GST document for ITC purposes.

The invoice number cannot exceed 16 characters and must be unique for the financial year.

For goods, on or before the date of removal of goods for export. For services, before or after the provision of service, but within 30 days of the supply.

Yes — export invoices are typically issued in foreign currency. For GST reporting, convert the value to INR using the RBI reference rate on the invoice date.

E-invoicing applies to export invoices if your aggregate annual turnover exceeds the notified threshold. Below the threshold, it is not mandatory.

The GST refund may be rejected and the supply may be treated as a domestic supply. Customs may also raise a query. Always include the exact declaration on the invoice.

Declare your GSTIN on the Bill of Entry. The IGST paid flows into your GSTR-2B automatically within 1-2 days of Out of Charge. Claim the credit in GSTR-3B.

Yes — a revised invoice can be issued for genuine errors, but it must be clearly marked and referenced to the original. Report it in the GST return for the period in which it is issued.

The Incoterms must match the commercial agreement with the buyer. Common terms are FOB, CIF, EXW, and DAP. The Incoterms determine who bears freight and insurance costs, which affects the assessable value for Customs.

Yes — the invoice must be signed or digitally signed by the authorised signatory. For e-invoices, the IRN and QR code authenticate the document.

Yes — you can use a unified series or separate series for domestic and export. The only rule is that each invoice number must be unique and consecutive within the chosen series.

Customs will raise a query and may re-assess the duty. If ITC has already been claimed at the wrong value, you may need to reverse it and re-claim based on the corrected BoE.

For GST invoicing and e-invoicing issues, contact the GST helpdesk at 1800-103-4786. For ICEGATE-related BoE and shipping bill matters, call 1800-3010-1000.

9. Related Export Import Compliance Resources

Export of Goods Under GST Import Export Documentation Shipping Bill Guide Bill of Entry Guide GST LUT Filing Guide RoDTEP Scheme Claim RCMC Certificate Guide GST for Exporters & Importers GST on Import of Goods Zero-Rated Supplies Under GST GST Refund for Exporters GST Return Filing Services Export Import GST Compliances

Disclaimer: This guide is for general information only and does not constitute legal or professional advice. GST rules, invoice formats, and customs procedures change from time to time. Please verify all details with the official GST portal, ICEGATE, or consult a qualified professional before acting on this information.