Export Refund Calculator (LUT Route) — Rule 89(4) GST Refund of Unutilised ITC for FY 2025-26

How to Use the Export Refund Calculator (LUT)

This calculator implements the precise refund computation prescribed by Rule 89(4) of the CGST Rules, 2017, applicable to exporters operating under the LUT route. The tool computes maximum admissible refund of unutilised Input Tax Credit, applies the 1.5× cap on zero-rated supply of goods, validates Section 54(1) limitation, and previews the Statement-3A field values you must enter on the GST common portal in Form RFD-01.

1. Pick the export type. Goods only, services only, or both. The visible input rows change based on selection.
2. Enter zero-rated turnover. For goods, use the FOB value declared on the shipping bill. For services, enter payments received during the relevant period reconciled with FIRC or BRC.
3. (Optional) Domestic value of like goods. For the 1.5× cap test under Rule 89(4)(C). If your export price exceeds 1.5× the domestic value of comparable goods, the cap kicks in.
4. Enter Total Turnover and Exempt Supplies. Total turnover follows Section 2(112). Exempt supplies (other than zero-rated) are deducted to arrive at Adjusted Total Turnover.
5. Split your ITC into inputs, input services and capital goods. Only inputs and input services count for Net ITC. Capital goods ITC is excluded by the Rule 89(4)(B) definition.
6. Enter Electronic Credit Ledger balance. The closing balance after filing GSTR-3B for the period. The refund cannot exceed this balance even if the formula yields a higher number.
7. Set Relevant Date and proposed Filing Date. The calculator validates the two-year limitation under Section 54(1).
8. Click Calculate Refund. Output includes refund amount, provisional 90%, Statement-3A preview, and time-bar checks.

Rule 89(4) Refund Formula — Decoded

The maximum admissible refund of unutilised Input Tax Credit on zero-rated supplies made without payment of Integrated Tax under LUT is governed exclusively by Rule 89(4) of the CGST Rules, 2017. Section 54(3) of the CGST Act provides the parent right; Rule 89(4) prescribes the mechanical formula.

Component A — Turnover of Zero-Rated Supply of Goods

Per Rule 89(4)(C) as amended by Notification No. 16/2020-Central Tax dated 23 March 2020, this is the value of zero-rated supply of goods made during the relevant period without payment of tax under LUT — capped at 1.5 times the value of like goods supplied domestically by the same or a similarly placed supplier, whichever is less. This cap was inserted to curb over-invoicing in fictitious refund claims and remains the most actively litigated provision in export refund disputes.

Component B — Turnover of Zero-Rated Supply of Services

Per Rule 89(4)(D), this is computed as: payments received during the relevant period for zero-rated services, plus payments received in advance in any prior period for which the supply was completed during the relevant period, minus advances received during the relevant period for services where supply has not yet been completed. Service exporters must reconcile this with FIRC or BRC realisation, not with invoice value.

Component C — Net ITC

Per Rule 89(4)(B), Net ITC means Input Tax Credit availed on inputs and input services only during the relevant period. Capital goods ITC is excluded by definition. Blocked credits under Section 17(5) of the CGST Act — motor vehicles, food and beverages, works contract for immovable property, club memberships and similar — are also not part of availed credit and must not be included.

Component D — Adjusted Total Turnover

Per Rule 89(4)(E) as amended by Notification No. 14/2022-Central Tax dated 5 July 2022, Adjusted Total Turnover is the aggregate turnover in a State or Union Territory under Section 2(112), excluding the value of exempt supplies other than zero-rated supplies, during the relevant period. The amendment was driven by the Supreme Court decision in Union of India v. VKC Footsteps India Pvt Ltd (2021) and was further clarified by CBIC Circular No. 197/09/2023-GST dated 17 July 2023.

Letter of Undertaking (LUT) — Form RFD-11

An LUT is a declaration filed in Form GST RFD-11 under Rule 96A of the CGST Rules, allowing a registered exporter to make zero-rated supplies without paying Integrated Tax upfront. It is the gateway to the LUT refund route under Rule 89. Without an LUT in force, every export invoice technically becomes an IGST-payable supply, not a zero-rated supply under bond/LUT — and the refund mechanism switches to Rule 96 (the IGST-paid route).

LUT Eligibility

Any GST-registered exporter is eligible to file an LUT, except those who have been prosecuted for tax evasion of an amount exceeding ₹2.5 crore under the CGST Act, IGST Act or any earlier tax law. Such exporters must furnish a bond accompanied by a bank guarantee.

LUT Filing Process — Step by Step

1. Log in to the GST common portal with valid credentials.
2. Navigate to Services › User Services › Furnish Letter of Undertaking (LUT).
3. Select the financial year for which the LUT is being filed.
4. Upload the previous financial year's LUT (optional — only if it was approved manually).
5. Provide names, addresses and occupations of two independent witnesses.
6. Preview, then sign with DSC (mandatory for companies and LLPs) or EVC (for proprietors and HUFs).
7. The LUT is treated as deemed approved if the proper officer takes no action within 3 working days.
8. Note the ARN — quote it on every export invoice.

LUT Validity & Renewal Discipline

An LUT is valid only from 1 April to 31 March of the financial year for which it is filed. Crucially, this is a calendar-bound validity — not a 12-month rolling window from the filing date. If you exported on 1 April without renewing, the export is technically without LUT cover. CBIC Circular 125/44/2019-GST dated 18 November 2019 permits ex-post-facto admission of LUT in cases of substantive compliance, but this is at the proper officer's discretion. Best practice: file the LUT for the new financial year on or before 31 March of the preceding year.

Mandatory Declaration on Export Invoice

Every export invoice must carry the declaration: "Supply meant for export under LUT without payment of IGST". The LUT ARN should be referenced on the invoice and on the shipping bill. Mismatch between the export invoice declaration and the shipping bill type (LUT vs IGST-paid) is a leading cause of ICEGATE error code SB005 and refund hold-up.

RFD-01 Refund Process — End to End

The LUT refund flows through Form GST RFD-01, processed manually by the proper officer. Unlike the IGST-paid route under Rule 96 (which is automatic via ICEGATE), the LUT route requires invoice-level documentation, Statement-3 reconciliation and CA certification above thresholds. The end-to-end timeline from filing to credit is typically 60 to 90 days for clean claims, longer where deficiency memos are issued.

Pre-filing Checklist

• Active LUT in force for the relevant financial year (Form RFD-11 ARN).
• GSTR-1 and GSTR-3B filed for all months in the relevant period — the GST portal will not allow RFD-01 submission otherwise.
• Validated bank account linked to the GSTIN — refunds are credited only to PFMS-validated accounts.
• IEC from DGFT active and reflected on the GST portal (mandatory for goods exports).
• Shipping bills with EGM (Export General Manifest) closure for goods, or FIRC/BRC for services.
• Adequate balance in Electronic Credit Ledger after the period's GSTR-3B is filed.

Form Flow — RFD-01 to RFD-06

Statement-3 — Invoice-Level Upload

The Statement-3 CSV uploaded with RFD-01 contains invoice-level details: GSTR-1 invoice number and date, port code, shipping bill number and date, EGM date, FOB value, taxable value, IGST/CGST/SGST/Cess paid (zero for LUT exports). The values must reconcile to the rupee with GSTR-1 Table 6A and the corresponding ICEGATE shipping bill records. Any value mismatch — even rounding — triggers system-generated errors. The portal then auto-populates Statement-3A based on Statement-3 line totals plus the user-entered Net ITC.

Common Computation Errors That Cause Refund Reduction

Based on practice experience, the following are the most frequent computation errors that lead to deficiency memos in Form RFD-03 or part-rejection of LUT refund claims. Avoid all five and the claim typically clears within the 60-day Section 54(7) window.

Error 1 — Including Capital Goods ITC in Net ITC

Rule 89(4)(B) is unambiguous: Net ITC is restricted to inputs and input services. Capital goods ITC must be segregated and excluded. Many exporters take the entire Electronic Credit Ledger balance as Net ITC and end up over-claiming. The proper officer reduces the refund by the capital goods component, typically with a deficiency memo. Maintain a separate ITC register tagging each invoice as Input, Input Service, or Capital Goods.

Error 2 — Including Section 17(5) Blocked Credits

ITC on motor vehicles (other than for transport of goods or specified passenger transport), food and beverages, outdoor catering, beauty treatment, health services, club memberships, life and health insurance (except statutory), works contract services for construction of immovable property, and goods/services for personal consumption — these are blocked under Section 17(5) and were never legally availed. Including them in Net ITC inflates the claim and triggers reduction.

Error 3 — Ignoring the 1.5× Cap on Goods

If your export price is materially higher than the domestic price for comparable goods, the cap kicks in. Common scenario: pharmaceutical exporters quoting USD-denominated prices that translate to INR values exceeding 1.5× the Indian retail price. Per Notification 16/2020, the lower of the two is used in the formula. Maintain documentary evidence of the domestic comparable price.

Error 4 — Wrong Adjusted Total Turnover Computation

Pre-Notification 14/2022, the denominator definition led to disputes — settled by VKC Footsteps and harmonised by Notification 14/2022 read with Circular 197/2023. Some exporters still use the older interpretation, leading to under-claim or over-claim. Always reconcile Adjusted Total Turnover with GSTR-3B Table 3.1 totals.

Error 5 — Refund Exceeding Electronic Credit Ledger Balance

Even if the Rule 89(4) formula produces a refund of ₹15 lakh, the system caps it at the closing Credit Ledger balance after the period's GSTR-3B is filed. If the ledger balance is ₹12 lakh, the refund is restricted to ₹12 lakh. Always verify the post-3B credit ledger before submitting RFD-01.

Refund Timeline & Interest Entitlement (Sections 54 & 56)

The CGST Act prescribes a layered timeline that protects exporters from working-capital lock-up. Each stage has a statutory cap, and breach of the 60-day final order window triggers automatic interest under Section 56 — a right that does not require separate application.

The Section 56 Interest Right

Section 56 of the CGST Act creates an automatic 6% per annum interest entitlement on any refund not paid within 60 days of the application acknowledgement. The exporter does not need to file a separate claim — the interest accrues by operation of law and is paid along with the principal refund. If the matter goes to appeal and the refund is sanctioned by an appellate authority, the interest rate increases to 9% per annum. Maintain the ARN, RFD-02 date and bank credit date — these are the only three data points needed to compute the interest entitlement.

Relevant Date — Goods vs Services

Per Explanation 2 to Section 54, the relevant date for the two-year limitation is:

• Goods exported by sea or air: the date on which the ship or aircraft leaves India.
• Goods exported by post: the date of dispatch by the post office.
• Goods exported by land: the date on which the goods pass the frontier.
• Services where supply was completed before payment: the date of receipt of payment in convertible foreign exchange (FIRC/BRC date).
• Services where payment was received before supply: the date of issue of invoice.

October 2024 Update — Notification 20/2024

The 54th GST Council meeting in September 2024 approved a substantial simplification of export refund rules. Notification No. 20/2024-Central Tax effective 8 October 2024 implemented the changes by omitting three problematic provisions:

• Rule 96(10) — Bar on refund of IGST paid on exports if the exporter or supplier had availed certain concessional benefits (advance authorisation, EPCG, deemed export benefits). The omission removes a bar that had triggered substantial litigation since 2018.
• Rule 89(4A) — Special formula for refund where supplies were received under deemed export benefits. Now subsumed within the standard Rule 89(4) formula.
• Rule 89(4B) — Special formula for refund where supplier had availed advance authorisation or EPCG benefits. Also subsumed within Rule 89(4).

What This Means for Exporters

Pre-October 2024, an exporter receiving inputs from a domestic supplier who had used advance authorisation could not claim the standard ITC refund — the law required a special carve-out computation. Post-omission, all exports under LUT follow the uniform Rule 89(4) formula irrespective of the upstream benefit chain. The change is genuinely procedure-simplifying and reduces compliance load for the exporter community materially.

Frequently Asked Questions on Export Refund (LUT Route)