Executive Summary
If you export software, IT services, digital consulting, or goods from India, filing a Letter of Undertaking (LUT) in Form GST RFD-11 allows you to supply zero-rated services without paying 18% Integrated Goods and Services Tax (IGST) upfront. This statutory declaration prevents working capital blockage and eliminates the slow bureaucratic process of applying for government tax refunds.
1. Statutory Framework: Rule 96A of CGST Rules & Section 16 IGST Act
Under Section 16(1) of the Integrated Goods and Services Tax (IGST) Act, 2017, the export of goods or services is treated as a "zero-rated supply." Exporters are provided two distinct routes to execute zero-rated exports:
- Route 1: Export under LUT or Bond without payment of IGST (Rule 96A): You supply services at 0% tax, quote your LUT Application Reference Number (ARN) on every invoice, and preserve all your working capital.
- Route 2: Export with payment of IGST and claim refund (Rule 96): You pay 18% tax from your electronic cash or credit ledger when filing GSTR-3B and subsequently claim a cash refund from the GST department.
For IT contractors, freelance software engineers, and digital marketing agencies, Route 1 (LUT) is universally preferred because paying 18% cash tax on foreign billings creates massive cash flow strain while waiting 60 to 120 days for refund disbursements.
2. Who is Eligible to File an LUT vs Who Must Furnish a Bond?
Under Notification No. 37/2017-Central Tax, any registered taxpayer exporting goods or services is eligible to file a Letter of Undertaking instead of a physical bond, provided they meet one straightforward condition:
If an exporter has been prosecuted for tax evasion exceeding ₹2.5 Crore, they must furnish an Export Bond on non-judicial stamp paper backed by a bank guarantee for 15% of the estimated tax liability. All other registered businesses and professionals are legally entitled to furnish an online LUT free of cost in minutes.
3. Step-by-Step Portal Walkthrough: Furnishing Form GST RFD-11
Filing the LUT is completely paperless and executed directly on the official GST Common Portal (gst.gov.in). Follow these exact steps:
Log in and Navigate to User Services
Log in to the GST Portal using your username, password, and captcha. On the top navigation bar, go to Services → User Services → Furnish Letter of Undertaking (LUT).
Select the Applicable Financial Year
In the dropdown menu labelled "LUT Applied for Financial Year", select the relevant fiscal cycle (e.g., 2026-2027). Note: LUT filings become active on April 1st and expire automatically on March 31st of the following calendar year.
Review Previous LUT Reference (If Applicable)
If you furnished an LUT in the preceding financial year, the portal will allow you to enter the previous ARN. You may also upload an optional PDF copy of the previous year's acknowledgment. If this is your first export year, you can proceed directly.
Accept the Three Statutory Undertakings
You must check all three statutory declaration boxes under Form RFD-11:
- To export the goods/services within the time period specified in sub-rule (1) of Rule 96A.
- To observe all the provisions of the GST Act and the rules made thereunder in respect of export of goods or services.
- To pay the integrated tax liable in respect of the goods/services along with interest at 18% per annum in case of failure to export or realize proceeds.
Enter Details of Two Independent Witnesses
The portal requires full names, occupations, and residential/business addresses of two independent witnesses. These can be employees, business associates, colleagues, or family members of legal age who reside in India.
Sign and Submit via DSC or EVC
Select the Primary Authorized Signatory from the dropdown and enter the Place of submission. Sole proprietorships and partnerships can verify via EVC (Electronic Verification Code) received on the registered mobile number and email. Companies and LLPs must authenticate via a registered Digital Signature Certificate (DSC Class 3).
4. Downloading Your Official LUT Acknowledgment PDF
Upon successful electronic verification, the portal immediately generates an Application Reference Number (ARN). The system status will update to "Submitted" and "Approved" instantaneously.
To download the official PDF for your banking records, go to Services → User Services → View My Submitted Applications. Select "Letter of Undertaking (LUT)" as the Application Type, locate your submission, and download the signed PDF. Store this document safely; your Authorized Dealer (AD) bank will require it to clear foreign inward remittances and issue Foreign Inward Remittance Certificates (FIRC).
5. Mandatory Endorsement Text Required on Export Invoices
Filing the LUT is only half the compliance battle. To maintain legal validity under Rule 46 of the CGST Rules, every commercial or tax invoice sent to an international client must bear the following exact statutory text:
In addition to this statement, your invoice header or regulatory block must explicitly declare:
- Your 15-digit GSTIN
- The RFD-11 Application Reference Number (ARN)
- The Financial Year of validity (e.g., FY 2026-27)
- Place of Supply explicitly marked as "Outside India"
- Services Accounting Code (SAC) such as 998311 or 998312
💡 Pro-Tip: Using COD XPERT Invoices automatically injects this statutory endorsement, your valid LUT ARN, and FEMA 23(R) disclaimers onto every foreign invoice you generate, guaranteeing 100% audit compliance.
6. Statutory Realization Timelines & Non-Compliance Penalties
Under Rule 96A(1)(b) of the CGST Rules read with the Foreign Exchange Management (Export of Goods and Services) Regulations 2015, foreign convertible exchange must be received in India within:
If the export payment is not realized within 15 days after the expiry of the 9-month window, the exporter is legally bound to deposit the integrated tax (18% IGST) along with 18% per annum interest calculated from the original invoice due date under Section 50(1). Once the proceeds are realized in foreign exchange subsequently, the taxpayer may claim a refund of the tax paid, but the 18% interest component is non-refundable.
7. Head-to-Head Comparison: LUT Route vs IGST Refund Route
| Parameter | Export Under LUT (Rule 96A) | Export With Payment of IGST (Rule 96) |
|---|---|---|
| Cash Outflow at Invoice | ₹0 (Zero working capital locked) | 18% of total invoice value paid in cash or credit |
| Refund Dependency | No refund application needed for output tax | Mandatory refund processing via ICEGATE/GST portal |
| Processing Turnaround | Instant online approval (under 5 minutes) | 60 to 120 days average refund wait time |
| Filing Frequency | Once per Financial Year | Every monthly tax filing cycle |
| Best Suited For | Freelancers, IT consultancies, SaaS, agencies | Large manufacturers with high accumulated ITC |
8. Five Common GST RFD-11 Portal Errors & How to Fix Them
Error 1: "DSC Signer Name Mismatch"
Cause & Fix: The PAN embedded inside your Class 3 Digital Signature Certificate must match the PAN of the Primary Authorized Signatory listed on the GST registration portal. Update the authorized signatory in your core registration amendment first if your director or partner has changed.
Error 2: "Witness Address Incomplete or Special Characters"
Cause & Fix: The portal form rejects symbols like `#`, `/`, or `@` in witness address fields. Enter plain alphanumeric text and ensure the PIN code and state match official postal databases.
Error 3: "Financial Year Already Submitted"
Cause & Fix: The portal only permits one active LUT per GSTIN per financial year. Check your "View Submitted Applications" to confirm your existing ARN before attempting a duplicate submission.
Error 4: "ARN Not Reflecting in GSTR-1 Table 6A"
Cause & Fix: In GSTR-1 Table 6A, select "Zero Rated Supply without payment of tax" and enter the 15-character ARN. It can take up to 2 hours for newly approved ARNs to propagate across all portal filing modules.
Error 5: "Session Timeout During EVC OTP Verification"
Cause & Fix: Clear your browser cache or open the portal in an Incognito window. GST portal OTPs expire in 10 minutes, but portal sessions time out after 15 minutes of idle time.
Frequently Asked Questions
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