GST LUT in Form RFD-11: Rules, Eligibility & Filing Guide

TL;DR

A Letter of Undertaking (LUT) furnished in Form GST RFD-11 enables Indian exporters and SEZ suppliers to clear zero-rated shipments without paying Integrated Tax (IGST) upfront. Under Rule 96A of the CGST Rules, the LUT must be submitted online on the GST portal before initiating any export for the financial year. It remains valid for one full financial year (1 April to 31 March). If goods do not leave India within 3 months, or if export remittance for services is not received within 1 year, the taxpayer must pay the IGST liability within 15 days along with 18% annual interest.

Quick Answer: What is a Letter of Undertaking (LUT) in GST?

Under Section 16 of the Integrated Goods and Services Tax (IGST) Act, exports of goods and services, as well as supplies to Special Economic Zone (SEZ) developers and units, are classified as zero-rated supplies.

Exporters can fulfill zero-rated shipments through two distinct routes:

1. Supply under Letter of Undertaking (LUT): Export goods or services without paying IGST at the time of clearance. The exporter protects operating cash flow and later applies for a refund of accumulated unutilised Input Tax Credit (ITC) under Rule 89.
2. Supply on payment of IGST: Pay the full output IGST out of pocket or through electronic ledgers, and subsequently claim a customs refund via ICEGATE after shipping bills are processed.

For industrial clusters across Gujarat—including ceramic manufacturers in Morbi, textile mills in Surat, brass component foundries in Jamnagar, and chemical plants in Ankleshwar and Dahej—the LUT route is standard practice. Paying 12% to 18% tax on export consignments locks up significant liquidity in customs refund cycles.

[Registered Exporter] ── (Files Form RFD-11 Online) ──> [GST Portal Approval]
       │
       ├─ Exports Goods / Services ──> [Zero IGST Paid Upfront]
       │                                     │
       ├─ Goods Leave India within 3 Months ─┤
       │                                     ▼
       └─ Unutilised ITC Refund Claim ──> [Form GST RFD-01 Refund Process]

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Statutory Framework: Section 16 IGST Act & Rule 96A CGST Rules

The legal foundation for the Letter of Undertaking is rooted in Section 16(3) of the IGST Act, read with Rule 96A of the CGST Rules, 2017, and governed by Notification No. 37/2017-Central Tax.

When an exporter furnishes Form GST RFD-11, they sign a binding statutory undertaking with the President of India agreeing to three mandatory covenants:

1. Timely Export of Goods

Under Rule 96A(1)(a), goods dispatched under an LUT must physically leave India within three months from the date of issue of the export tax invoice. If customs clearance is stalled and goods remain in domestic territory past the 90-day window, the zero-rated benefit is suspended.

2. Timely Realization of Foreign Exchange for Services

Under Rule 96A(1)(b), where services are exported under an LUT, payment in convertible foreign exchange (or in Indian Rupees wherever permitted by the Reserve Bank of India) must be received within one year from the date of invoice issuance, or within such further period as permitted by the competent authority under the Foreign Exchange Management Act (FEMA).

3. The 15-Day Statutory Recovery Clause

If the exporter fails to export goods within 3 months, or fails to realize payment for services within 1 year, Rule 96A(1) establishes an automatic recovery trigger:

The registered exporter must pay the applicable IGST along with interest under Section 50 at 18% per annum within fifteen days of the expiry of the three-month or one-year period.

Failing to pay the tax within this 15-day recovery window immediately suspends the LUT facility. Until the tax and accrued interest are cleared, the exporter cannot make any zero-rated supply without paying tax upfront.

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Eligibility: Who Can File an LUT vs Who Must Furnish a Bond?

Almost every regular business with an active GSTIN and an active Import Export Code (IEC) can execute an LUT. However, strict statutory disqualifications apply to businesses facing major tax evasion proceedings.

Compliance Factor	Letter of Undertaking (Form RFD-11)	Export Bond (with Bank Guarantee)
Applicable Rule	Rule 96A(1) of CGST Rules	Rule 96A(2) to 96A(4) of CGST Rules
Eligible Taxpayers	All registered exporters without prosecution history	Exporters prosecuted for tax offences > ₹2.5 Crore
Submission Mode	100% Online on the GST Portal	Physical submission to Jurisdictional Tax Officer
Documentation Needed	Form RFD-11 + 2 Independent Witnesses	Non-judicial stamp paper + Bank Guarantee (BG)
Bank Guarantee Required	None (Zero financial collateral)	Typically 15% of estimated IGST liability
Processing Time	Instant ARN generated online	Several days for departmental verification
Validity	One Financial Year (1 April – 31 March)	Running bond until exhausted

The Statutory Prosecution Threshold

Under Notification No. 37/2017-Central Tax, a registered person is disqualified from furnishing an LUT only if they have been prosecuted for an offence under the CGST Act, the IGST Act, or any pre-GST indirect tax laws (Central Excise, Service Tax, VAT) where the amount of tax evaded exceeds ₹250 Lakhs (₹2.5 Crore).

If a business is undergoing investigation without an order of prosecution, or if the contested tax is below ₹2.5 Crore, the business remains fully eligible to furnish an online LUT.

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Worked Example: Working Capital Impact for a Morbi Ceramic Exporter

To understand the commercial importance of an LUT, consider a ceramic tile manufacturer based in Morbi, Gujarat, producing glazed vitrified tiles for export to buyers in the Gulf and European markets.

Profile of the Exporter

• Average Monthly Export Turnover: ₹2,50,00,000 (₹2.5 Crore)
• Applicable GST Rate on Ceramic Tiles: 18%
• Raw Material & Energy Purchases (Monthly): ₹1,80,000 in domestic inward supplies (natural gas, clay, chemicals) carrying ₹25,00,000 in monthly ITC.

Scenario A: Exporting with Payment of IGST

1. Every month, the exporter must pay 18% IGST on ₹2.5 Crore = ₹45,00,000.
2. They utilize ₹25,00,000 from their electronic credit ledger and must arrange ₹20,00,000 in cash through bank overdrafts or working capital lines.
3. The average turnaround time for customs refund scrolls and ICEGATE clearance ranges between 45 and 75 days.
4. Over a 90-day operating cycle, the exporter keeps between ₹90,00,000 and ₹1,35,00,000 in rolling capital locked in the tax department’s pipeline.
5. At a working capital financing cost of 9.5% per annum, servicing this blocked tax cash flow costs the business ₹8,55,000 to ₹12,80,000 annually in unnecessary interest overhead.

Scenario B: Exporting under Form RFD-11 LUT

1. The manufacturer files Form RFD-11 on 1 April for the entire financial year.
2. The export invoices are cleared with ₹0 cash outflow for IGST.
3. The ₹25,00,000 monthly accumulated ITC sits securely in the credit ledger.
4. The company files quarterly or monthly refund applications for unutilised credit under Form GST RFD-01 without paying output tax first.
5. Operating liquidity remains intact, completely avoiding high interest overhead on borrowed tax capital.

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Statutory Timelines: The 3-Month and 1-Year Deadlines

Compliance does not end with generating an LUT Application Reference Number (ARN). The exporter’s finance team must monitor the execution calendar for each dispatch:

[Invoice Date]
      │
      ├─ 90 Days ─> Did goods leave India? (Shipping Bill + EGM)
      │               ├── YES ──> Zero-rated condition satisfied
      │               └── NO  ──> Pay IGST + 18% interest within 15 days
      │
      └─ 365 Days ─> Did service remittance arrive in convertible FX? (BRC / FIRC)
                      ├── YES ──> Zero-rated condition satisfied
                      └── NO  ──> Pay IGST + 18% interest within 15 days

1. Goods: 90 Days to Cross the Border

Customs documentation serves as the evidentiary benchmark. The Export General Manifest (EGM) and the carrier’s departure date confirm that goods crossed Indian territorial waters. If manufacturing delays, vessel cancellations, or port congestions push physical departure beyond 90 days from the invoice date, the exporter must apply for an extension from the jurisdictional tax officer before the 90-day mark or pay the output tax.

2. Services: One Year for Foreign Remittance

For IT/ITeS firms in Ahmedabad, design consultancies, and engineering services, export realization depends on Foreign Inward Remittance Certificates (FIRC) or electronic Bank Realisation Certificates (e-BRC). Where RBI regulations allow credit extensions for capital goods or specific service contracts, the LUT timeline tracks the FEMA extension, provided official documentary evidence is retained on record.

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Step-by-Step Guide: How to File Form GST RFD-11 on the GST Portal

Filing an LUT takes less than 15 minutes on the official GST Portal (www.gst.gov.in). Follow this operational procedure:

Step 1: Log in and Access User Services

Log in with your primary authorized credentials. On the top navigation menu, go to: Services → User Services → Furnish Letter of Undertaking (LUT)

Step 2: Select the Financial Year

Select the upcoming or current Financial Year from the dropdown menu (e.g., FY 2026-27). Note: The portal opens LUT submissions for the next financial year in February and March. Filing before 31 March ensures uninterrupted shipments from 1 April.

Step 3: Prior Year LUT Reference

If you furnished an LUT in the previous financial year, select “Yes” under the prior filing section, enter the previous ARN, and upload the earlier acknowledgment PDF. If you are a newly registered business exporting for the first time, select “No”.

Step 4: Accept Mandatory Statutory Undertakings

Tick the three legal declaration boxes confirming that:

• Goods will be exported within three months from the invoice date.
• You will adhere to GST rules regarding payment of tax and interest if exports are delayed.
• You will observe FEMA guidelines regarding foreign exchange realization.

Step 5: Enter Witness Information

Enter the personal details of two independent witnesses:

• Full Legal Name
• Residential or Professional Address
• Occupation

The witnesses do not need to be shareholders or directors; they can be company employees, accountants, or independent professionals. However, their contact information must be accurate.

Step 6: Authenticate and Submit

Select the Authorized Signatory from the dropdown list and specify the Place of signing:

• Companies and LLPs: Must authenticate using a Digital Signature Certificate (DSC) of Class 3.
• Sole Proprietorships and Partnerships: Can sign using either a DSC or an Electronic Verification Code (EVC) generated via Aadhaar OTP.

Once authenticated, the portal displays a success dialog and immediately generates the Application Reference Number (ARN). Download and store the generated acknowledgment PDF (GST_RFD-11_ARN.pdf) for customs brokers and freight forwarders.

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Mandatory Invoicing & Return Filing Rules (GSTR-1 & GSTR-3B)

Filing the LUT is only step one. Your day-to-day invoicing and monthly return compliance must accurately align with your zero-rated declaration.

1. Mandatory Endorsement on Export Invoices

Under the second proviso to Rule 46 of the CGST Rules, every commercial export invoice raised without tax must carry a specific legal endorsement in the invoice header:

“SUPPLY MEANT FOR EXPORT/SUPPLY TO SEZ UNIT OR SEZ DEVELOPER FOR AUTHORISED OPERATIONS UNDER LETTER OF UNDERTAKING WITHOUT PAYMENT OF INTEGRATED TAX”

In addition to this statement, best practice dictates printing the LUT ARN Number and Date of Filing on the invoice face. Customs officials verify this reference against the Shipping Bill before passing export consignments.

2. GSTR-1 Table 6A Reporting

When filing your monthly or quarterly GSTR-1 return, declare all export invoices in Table 6A (Exports):

• Select Export Type: WOPAY (Export under LUT / Without Payment of Tax).
• Enter the Shipping Bill / Bill of Export Number, Shipping Bill Date, and Port Code.
• The invoice value is entered in the taxable column, while the IGST rate is set to 0.

3. GSTR-3B Table 3.1(b) Reporting

In your monthly GSTR-3B summary return:

• Enter the total taxable value of zero-rated supplies in Table 3.1(b) — Outward taxable supplies (zero-rated).
• Integrated tax is reported as ₹0.
• Ensure that the turnover reported in Table 3.1(b) matches the cumulative invoice value declared in Table 6A of GSTR-1 to prevent automated system notices under Form GST DRC-01B.

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Domestic Supplies to SEZ Units: Essential Documentation

Supplying goods or services to an SEZ unit or developer within Gujarat (such as GIFT City in Gandhinagar, Dahej SEZ, or Kandla SEZ) qualifies as a zero-rated supply under Section 16(1)(b) of the IGST Act.

An LUT covers SEZ supplies without tax, but you must secure additional proof:

1. The supplies must be for authorized operations approved by the SEZ Development Commissioner.
2. The SEZ recipient must provide a copy of their Approval Letter.
3. For goods entering the SEZ zone, obtain an endorsement on the delivery challan or invoice from the Specified Officer (SO) or Authorized Officer of the SEZ within 45 days.
4. Without the physical or electronic endorsement of the Specified Officer, the tax department can treat the transaction as a domestic taxable supply and demand full IGST plus interest.

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Common Mistakes

1. Shipping goods before generating the LUT ARN: Shipping bills filed with customs prior to generating the current financial year’s ARN are technically unbacked, leading to export delays or customs queries.
2. Omitting the mandatory Rule 46 endorsement: Leaving off the “Supply meant for export under Letter of Undertaking without payment of integrated tax” statement from the invoice header makes the document non-compliant during departmental audits.
3. Misreporting in GSTR-1 Table 4 instead of Table 6A: Classifying an export invoice as a standard B2B domestic transaction in GSTR-1 creates tax liability discrepancies that trigger automated demand notices.
4. Failing to track the 90-day export window on delayed shipments: Letting consignments linger in ports or warehouses past 3 months without paying IGST or securing an official extension creates automatic 18% interest liabilities.
5. Ignoring SEZ Specified Officer endorsements: Treating domestic supplies to GIFT City or other SEZ units as zero-rated without securing the authorized officer’s stamp.

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Frequently Asked Questions

What is the validity period of a GST LUT?

A Letter of Undertaking is valid for one full financial year, expiring automatically on 31 March regardless of the date it was filed. For instance, an LUT submitted on 15 May 2026 or 10 January 2027 remains valid only up to 31 March 2027. Exporters must renew their LUT annually before 1 April to maintain continuous zero-rated exports.

Can a newly registered business file an LUT immediately?

Yes. A newly registered business can submit Form GST RFD-11 immediately after receiving its active GSTIN. There is no minimum turnover requirement, track record, or seasoning period required. As long as the business has an active Import Export Code (IEC) and has not been prosecuted for tax evasion exceeding ₹2.5 Crore, the portal generates the LUT ARN instantly.

Do supplies to SEZ units or SEZ developers require an LUT?

Yes. Supplies made to Special Economic Zone (SEZ) developers or units are classified as zero-rated under Section 16 of the IGST Act. To supply goods or services to an SEZ customer without charging 18% IGST, the domestic supplier must hold a valid LUT for that financial year and obtain an endorsement for authorized operations from the SEZ Specified Officer.

Can an exporter switch between export under LUT and export on payment of IGST?

Yes. Holding an active LUT gives you the legal right to export without tax, but it does not mandate it for every single invoice. An exporter can choose to ship specific consignments under LUT (WOPAY) and other consignments on payment of IGST (WPAY) within the same financial year, depending on their working capital and credit accumulation strategies.

Are two witnesses required every time an LUT is filed online?

Yes. The statutory form for RFD-11 mandates the names, residential addresses, and occupations of two independent witnesses. The witnesses do not need to upload digital signatures or identity documents, but their details must be recorded accurately in the portal submission fields.