Export of Services Under GST: Letter of Undertaking (LUT) vs. IGST Payment with Refund

India has rapidly evolved into a global hub for IT services, software development, business process outsourcing, marketing agencies, financial consulting, and remote professional engineering. For Indian service providers catering to clients across borders, navigating the Goods and Services Tax (GST) framework is essential. Under Indian tax law, exports are classified as zero-rated supplies. This core principle ensures that Indian businesses do not export taxes abroad, allowing them to remain competitive globally.

However, when executing the mechanics of an export, businesses face a crucial strategic decision: Should you export services under a Letter of Undertaking (LUT) without paying IGST, or should you pay IGST upfront and claim a subsequent cash refund?

Making the wrong choice can paralyze your working capital, trigger rigorous departmental audits, or complicate your compliance calendar. This comprehensive guide breaks down the legal provisions, mechanics, advantages, risks, and strategic considerations of choosing between GST LUT and IGST Payment with Refund.

Part 1: Decoding “Zero-Rated Supply” Under GST

To understand why LUT and IGST refunds exist, you must first understand the concept of zero-rated supply under Section 16 of the Integrated Goods and Services Tax (IGST) Act.

Unlike “exempt” supplies—where input tax credit (ITC) cannot be claimed—a zero-rated supply means:

1. The tax rate on the output supply is 0%.

2. The exporter is fully entitled to claim Input Tax Credit (ITC) on the inputs, input services, and capital goods used to execute those exports.

The 5 Statutory Conditions for Export of Services

Not every service rendered to an overseas client qualifies as an export under GST. Section 2(6) of the IGST Act mandates that a transaction must simultaneously fulfill five rigid conditions:

1. Location of the Supplier: The supplier of the service must be located in India.

2. Location of the Recipient: The recipient of the service must be located outside India.

3. Place of Supply: The place of supply of service must be outside India (governed strictly by Section 13 of the IGST Act).

4. Consideration: The payment for the service must be received by the supplier in convertible foreign exchange (or in Indian Rupees wherever permitted by the Reserve Bank of India [RBI]).

5. Distinct Persons Rule: The supplier and the recipient are not merely establishments of a distinct person in accordance with Explanation 1 in Section 8 of the CGST Act (i.e., they cannot be mere branches of the same corporate entity failing independent corporate structures).

If even one of these criteria fails, the transaction loses its export status, shifting the tax liability to domestic rules (often attracting standard 18% GST).

Part 2: Option A – Export Under Letter of Undertaking (LUT)

What is a Letter of Undertaking (LUT)?

A Letter of Undertaking (LUT) is a formal declaration submitted electronically on the GST portal (via Form GST RFD-11) by a registered taxpayer. By filing an LUT, an exporter undertakes that they will fulfill all requirements specified under GST law during the financial year without paying IGST at the time of export.

Eligibility Criteria for Filing an LUT

Gone are the days when physical bank guarantees were compulsory for all exporters. Rule 96A of the Central Goods and Services Tax (CGST) Rules permits any registered taxpayer to furnish an LUT, except those who have been prosecuted under the CGST Act or the IGST Act (or any existing laws) where the tax evasion exceeds ₹2.5 crores.

Mechanics of Exporting Under LUT

• Invoice Generation: You issue an export invoice with zero tax. The invoice must clearly state: “SUPPLY MEANT FOR EXPORT UNDER LUT WITHOUT PAYMENT OF INTEGRATED TAX (IGST)”.

• Filing Returns:

  • Report the transaction in GSTR-1 under Table 6A (Export Invoices).

  • Report the turnover summary in GSTR-3B under Table 3.1(b) (Zero-rated outward supplies).

• Unutilized ITC Refund: Because you didn’t pay output IGST, you cannot claim an “IGST refund.” However, your business accumulates Input Tax Credit on vendor bills, rent, software subscriptions, and professional fees. You can claim a refund of this unutilized Input Tax Credit via Form GST RFD-01 under Section 16(3) of the IGST Act.

Benefits of the LUT Route

1. Zero Upfront Tax Outflow: You do not block your capital by paying 18% tax to the government and waiting months to retrieve it.

2. Streamlined Cash Flow: Ideal for IT, SaaS, and agency startups operating on lean margins.

3. Reduced Compliance Friction: Avoids complex refund scrutiny cycles tied directly to IGST cash ledgers.

Limitations and Risks of LUT

1. Mandatory Annual Renewal: An LUT is valid strictly for a single financial year. You must file a fresh LUT (Form GST RFD-11) before April 1st of every new financial year. Failing to renew results in blocked export filing capabilities.

2. FEMA Realization Timelines: Under Foreign Exchange Management Act (FEMA) guidelines, payment for exported services must be realized within the prescribed timeframe (typically 9 months or as extended by RBI). If the foreign client defaults or delays payment beyond permitted limits, you may be forced to pay the tax liability along with heavy interest.

Part 3: Option B – Export on Payment of IGST with Refund

What is the IGST Payment Route?

Under this mechanism, the service provider treats the export transaction like a regular taxable domestic supply. They charge applicable IGST (e.g., 18%) on the export invoice, pay the tax to the government via cash or electronic credit ledger, and subsequently file a refund claim for the entire IGST paid.

Mechanics of Exporting with IGST Payment

• Invoice Generation: Issue an export invoice charging the standard IGST rate.

• Return Filings: Report the supply in GSTR-1 and pay the tax liability through GSTR-3B.

• Filing for Refund: File Form GST RFD-01 on the GST portal selecting the category “Export of Services with Payment of Tax”. You must attach:

  • Export invoices.

  • Bank Realization Certificates (BRC) or Foreign Inward Remittance Certificates (FIRC) proving foreign exchange receipt.

  • Statement of invoices (Annexure-1).

  • A Chartered Accountant (CA) certificate if the refund claim exceeds ₹2,00,000.

Benefits of the IGST Payment Route

1. Fewer Technical Mismatch Errors: Unlike goods exports (where shipping bills map directly with customs data automatically), service exports rely entirely on manual data entry in RFD-01. Paying IGST and claiming refunds can sometimes provide a cleaner audit trail for specific high-value corporate structures.

2. Hedge Against ITC Accumulation Restrictions: If a business has complicated inverted duty structures or disputed input credits, routing through IGST cash payments bypasses certain formulaic restrictions of unutilized ITC refund calculations under Rule 89(4).

Limitations and Risks of IGST Payment

1. Severe Working Capital Blockage: You must pay 18% cash out of pocket upfront. Given that government refund processing can take anywhere from 30 to 90 days (or longer if deficiency memos are issued), your cash flow takes a massive hit.

2. Stringent Scrutiny & Deficiency Memos: Tax officers closely examine IGST cash refund applications for service exports. Minor mismatches between FIRC numbers, invoice dates, and GSTR-3B filings invite automated deficiency memos (GST RFD-03), requiring you to re-file applications.

Part 4: Comparative Breakdown: LUT vs. IGST Payment

Part 5: Step-by-Step Compliance Checklist for Exporters

To ensure zero litigation and seamless processing, implement this internal workflow within your finance department:

1. Pre-Registration & Verification: Ensure active GST registration with “Export of Services” explicitly added to your business profile.

2. Execute LUT on Time: Before executing any export invoice in a new financial year, log into the GST Portal (Services > User Services > View my submitted LUT) and file Form RFD-11. Download and archive the signed acknowledgment PDF.

3. Draft Compliant Invoices: Ensure every invoice includes:

   • Client’s complete international billing address.

   • Permanent Account Number (PAN) / Tax ID of the overseas client (if applicable).

   • Explicit remark: “SUPPLY MEANT FOR EXPORT UNDER LUT WITHOUT PAYMENT OF INTEGRATED TAX”.

4. Track FEMA & FIRC Realization: Keep close tabs on your bank remittances. Ensure foreign currency hits your designated authorized dealer (AD) bank account within FEMA windows. Match every invoice with its corresponding FIRC/INBM reference.

5. Accurate GSTR-1 Reporting: File Table 6A meticulously. Double-check invoice numbers, taxable values, and port codes (if applicable). Discrepancies between GSTR-1 and GSTR-3B are the #1 cause of GST notices.

Part 6: Frequently Asked Questions (FAQs)

Q1: Can I switch between LUT and IGST Payment during the same financial year?

Answer: Yes. An LUT is filed for a financial year, but opting for LUT does not legally restrict you from paying IGST on a specific export invoice if you choose to. However, most businesses stick to one uniform policy to avoid accounting confusion.

Q2: What happens if my foreign client pays in Indian Rupees (INR)?

Answer: Under recent RBI guidelines, export of services invoiced and paid in INR can still qualify as an export under GST provided the payment is received through special Vostro accounts or permitted channels approved by the RBI convertible framework. Always verify with your bank beforehand.

Q3: Is a CA Certificate mandatory for filing unutilized ITC refunds under LUT?

Answer: For refund claims up to a specified threshold, self-certification or standard statements suffice, but a Chartered Accountant certificate (Annexure B) is mandatory if the claim crosses specified limits or depends on composite audit requirements under state jurisdictions.

Conclusion: Which Route Should You Choose?

For 95% of service exporters—ranging from software developers and digital marketers to engineering consultants—exporting under a Letter of Undertaking (LUT) is the undisputed winner. It preserves precious working capital, eliminates unnecessary interaction loops with tax refund officers, and keeps administrative overhead low.

Reserve the IGST payment route only if your tax consultant specifically advises it due to unique transitional credit adjustments. Whichever path you choose, rigorous documentation, timely return filings, and strict adherence to FEMA realization timelines are your best shields against tax litigation.