GST Refund for Exporters: LUT Bond, Form RFD-01 and the 60-Day Window

For an Indian exporter, GST is a working-capital cost unless the refund cycle is tight. Hundreds of crores of ITC sit on the GST portal because the export refund application was incomplete, the FIRC date did not match the shipping bill, the LUT had expired, or the bank reconciliation did not tie back to GSTR-1 invoice numbers. This guide walks through the two refund routes, the procedural touchpoints, the documentation that survives a refund audit, and the timeline that defines the cash flow.

Two Routes for Zero-Rated Supplies

Section 16 of the IGST Act gives exporters two ways to discharge the zero-rated nature of their exports.

Route A: Pay IGST, Claim Refund

Under this route, the exporter charges IGST on the export invoice and pays it through GSTR-3B. The refund of the IGST paid is automatic for goods exporters: the shipping bill itself is treated as the refund application under Rule 96 of the CGST Rules. For service exporters, refund is via Form RFD-01.

Pros: Cash refund of IGST paid (full amount, fast for goods). Cons: Cash outflow at the time of payment, especially painful for service exporters with significant export turnover.

Route B: Supply Under LUT, Claim ITC Refund

Under this route, the exporter files a Letter of Undertaking (Form RFD-11) at the start of the financial year, undertaking to fulfil the conditions of zero-rating. No IGST is charged on the export invoice. The accumulated unutilised ITC on inputs and input services is refunded under Section 54(3)(i) via Form RFD-01.

Pros: No cash outflow on export invoices. Cons: ITC refund needs a formal RFD-01 application; processing takes 15 to 60 days.

For service exporters, especially those with continuous monthly billing, Route B (LUT) is the standard choice.

Filing the LUT (Form RFD-11)

The LUT is filed once at the start of every financial year, online on the GST portal:

1. Login at gst.gov.in.
2. Navigate to Services > User Services > Furnish Letter of Undertaking.
3. Select the financial year. Fill in two witness names with their addresses and occupations.
4. Sign with DSC (companies/LLPs) or EVC.
5. Submit. The acknowledgement (ARN) is generated immediately.

The LUT is valid for the financial year. It must be renewed before 1 April of the next FY. If you miss filing the LUT, every export invoice raised after that date must charge IGST until the LUT is filed (or pay IGST and use Route A).

Eligibility: any registered person making zero-rated supplies, except those who have been prosecuted for tax evasion of Rs 2.5 crore or more.

Form RFD-01: The Refund Application

The refund application has multiple types depending on the underlying claim:

Form RFD-01 is filed online with supporting statements (Statement 1A, 2, 3, 4, depending on type) and documents.

Step-by-Step RFD-01 Filing

1. Aggregate the period. Refund can be claimed for any period (monthly, quarterly), but cannot span more than two financial years in a single application.
2. Reconcile GSTR-1 with shipping bills. For goods exports, ensure each export invoice in GSTR-1 maps to a shipping bill with the correct invoice number, date and value.
3. Reconcile GSTR-1 with FIRC / BRC. For services, the export invoice must be backed by a Foreign Inward Remittance Certificate (FIRC) or Bank Realisation Certificate (BRC) confirming receipt of foreign exchange.
4. Compute the refund amount. Under the LUT route, the refund formula is in Rule 89(4): (Turnover of zero-rated supply / Adjusted total turnover) x Net ITC. Net ITC excludes capital goods.
5. Login to gst.gov.in. Navigate to Services > Refunds > Application for Refund. Select the type and period. Enter the computed refund amount and attach supporting documents.
6. Attach Statement 3 / Statement 2 / Statement 4 as applicable. Statement 3 is for export of goods/services without payment of tax. Statement 2 is for export with payment.
7. DSC/EVC sign and submit. ARN is generated.

The 15-Day and 60-Day Rules

• 15 days: The proper officer issues an acknowledgement in Form RFD-02 if the application is complete. If deficient, a deficiency memo (Form RFD-03) is issued and the exporter must re-file.
• 60 days: The refund must be sanctioned within 60 days from the date of receipt of the complete application. Delay attracts interest at 6% per annum.
• Provisional refund: Under Rule 91, 90% of the refund claim for zero-rated supplies under LUT is issued provisionally within 7 days of acknowledgement, with the balance 10% after final processing. This was specifically designed to ease cash flow for genuine exporters.

Documentation Required

For zero-rated supplies under LUT (Section 54(3)(i)):

• Invoices issued for the export.
• For goods: shipping bill, bill of lading or airway bill.
• For services: FIRC/BRC, agreement/contract with foreign client.
• Statement 3 (auto-populated from GSTR-1).
• Declaration that no refund of IGST has been claimed for the same supplies.
• CA certificate (Form RFD-01 Annexure 2) if claim is above Rs 2 lakh.

For inverted duty refund (Section 54(3)(ii)):

• Statement 1A.
• List of inward and outward supplies showing inverted rate structure.
• Declaration that no input tax credit reversal is required.

The Department audit on refunds focuses on:

• Mismatch between GSTR-1 export invoices and shipping bills.
• FIRC date later than the refund period (foreign exchange not yet realised).
• ITC claimed in GSTR-3B but not reflected in GSTR-2B (post-IMS rollout, this is a hard block).
• Capital goods ITC included in net ITC (disallowed under Rule 89).

Inverted Duty Structure Refund

Section 54(3)(ii) allows refund of unutilised ITC where the rate of tax on inputs is higher than the rate of tax on outputs. The classic example is a textile manufacturer with inputs at 18% (yarn, dyes, packing) and outputs at 5%. Such manufacturers accumulate ITC and need a refund mechanism.

Restrictions:

• No refund of ITC on input services under inverted duty (only inputs are eligible). Some High Court rulings have read this down for specific cases; the safe practice is to claim only on inputs.
• No refund of ITC on capital goods.
• Refund is computed using Rule 89(5): Maximum refund = ((Turnover of inverted rated supply x Net ITC) / Adjusted total turnover) minus tax payable on inverted rated supply.

Common Refund Errors and Notice Triggers

• LUT not filed for the FY. Default to IGST payment until filed.
• Shipping bill number does not match GSTR-1 invoice. The shipping bill is treated as a refund application under Rule 96; mismatched data blocks auto-refund.
• FIRC date later than the period claimed. Foreign exchange must be realised. For service exporters, partial realisation can be claimed proportionally.
• Capital goods ITC included. Disallowed in net ITC for both export refund and inverted duty.
• Refund period straddles more than two FYs. Application is rejected.
• CA certificate missing for claims above Rs 2 lakh. Application is treated as deficient.
• Same supplies covered under both routes. Cannot claim IGST refund and ITC refund for the same invoices.

Action Plan for an Export-Heavy Business

1. File LUT in the first week of April every year. Set a calendar reminder. The 1 April invoice should be raised under LUT, not IGST.
2. Maintain a refund register that lists each export invoice, shipping bill / FIRC reference, and which refund period the claim will be made in.
3. Reconcile GSTR-1 vs shipping bills monthly. Errors compound; catching them at month-end is far easier than at refund time.
4. File RFD-01 monthly or quarterly. Smaller, regular applications process faster than one large annual application.
5. Track the 60-day clock. If the proper officer has not sanctioned within 60 days from the complete application date, follow up in writing and quote Section 56 for interest entitlement.
6. Keep CA certificate templates ready for claims above Rs 2 lakh.
7. Watch GSTR-2B for ITC availability. Under the post-IMS regime, only ITC reflected in GSTR-2B is claimable in GSTR-3B and refundable. See our GSTR-2B reconciliation guide.

Where Tax Garden Helps

The cash that exporters can unlock through cleaner refund processes is often larger than the year's GST tax outflow itself. Tax Garden's Compliance Standard plan handles LUT filing, monthly export reconciliation, RFD-01 preparation and follow-up with the proper officer until the refund credit hits your bank account. We also handle inverted duty refund computation and the supporting CA certificate.

For related reading, see our GSTR-2B reconciliation guide, place of supply rules and reverse charge mechanism.

Frequently Asked Questions

What is a Letter of Undertaking (LUT) and why do I need one?

A Letter of Undertaking, filed in Form RFD-11, allows a registered exporter to make zero-rated supplies (exports or supplies to SEZ) without paying IGST. The exporter can then claim a refund of unutilised input tax credit. The LUT is filed once a year on the GST portal and avoids the working capital cost of paying IGST upfront.

How long does GST export refund take?

The GST officer must issue an acknowledgement (RFD-02) within 15 days of a complete application and sanction the refund within 60 days. A provisional 90% refund is issued within 7 days for zero-rated supplies under LUT, with the balance after final processing. Delays beyond 60 days entitle the exporter to interest at 6% per annum under Section 56.

Can I claim refund of IGST paid on exports of services?

Yes, through Form RFD-01 under Section 54. Service exporters can either supply under LUT and claim refund of unutilised ITC, or pay IGST and claim refund of the IGST. Goods exporters get auto-refund of IGST through the shipping bill under Rule 96; no RFD-01 is needed for IGST-paid goods exports.

What is the refund formula for zero-rated supplies under LUT?

Under Rule 89(4): Refund Amount = (Turnover of zero-rated supply x Net ITC) / Adjusted total turnover. Net ITC excludes capital goods ITC. The formula is computed for each refund period.

What documents do I need for an export refund application?

GSTR-1 export invoice details, GSTR-3B for the period, shipping bills (for goods), FIRC or BRC (for services), Statement 3 (auto-populated), declaration that no IGST refund is claimed for the same supplies, and a CA certificate for claims above Rs 2 lakh.

What is inverted duty structure and how does its refund work?

An inverted duty structure exists when the rate of tax on inputs is higher than the rate on outputs. For example, a manufacturer with 18% inputs producing 5% output. Section 54(3)(ii) allows refund of accumulated ITC on inputs (not input services or capital goods). Refund is computed under Rule 89(5) and filed in RFD-01 with Statement 1A.

Sources

This guide is verified against Section 16 of the IGST Act 2017, Sections 54 and 56 of the CGST Act 2017, Rules 89, 91 and 96 of the CGST Rules 2017, the GST Portal's Refund Process FAQs, and CBIC Circulars on export refunds. Confirmatory practitioner coverage from ClearTax, IRIS GST, IndiaFilings and TaxGuru articles was reviewed for current procedural and timeline positions. Always validate the latest forms, statements and rule amendments against gst.gov.in and cbic.gov.in before filing.