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GST Refund on Exports under LUT - Rule 89(4) calculation explained
GST Updated August 2026 8 min read Author Pavan | Taxation & Finance

GST Refund on Exports Under LUT: Rule 89(4) Calculation

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An exporter has the option to export goods or services under a Letter of Undertaking (LUT), which means goods or services or both can be exported without payment of IGST. This is done by furnishing a Letter of Undertaking to the GST authorities. Exports made this way are categorised as zero-rated supplies under Section 16 of the IGST Act, and a supplier making zero-rated supplies can opt for the LUT route. Here is a practical illustration on GST refunds on exports under LUT.

For businesses registered under GST that export, working capital is often stuck in the tax paid on procurement of raw materials used in producing the exported goods. They are eligible to recover the tax paid on such inputs through this refund. Under GST law, exports of goods and services are treated as "zero-rated supplies."

What is a "zero-rated supply"?

"Zero rated supply" means any of the following supplies of goods or services or both:

  1. Export of goods or services or both; or
  2. Supply of goods or services or both, for authorised operations, to a Special Economic Zone Developer or a Special Economic Zone unit.

A registered person can claim refund of unutilised input tax credit (ITC) that accumulates due to procurement of inputs, before the expiry of two years from the "relevant date."

The "relevant date" — Explanation 2 to Section 54

As per Explanation 2 to Section 54 of the CGST Act, 2017, the relevant date is determined as follows.

In case of goods

Sl. No. Case Relevant Date
a Goods exported by air or sea Date on which the ship or aircraft leaves India
b Goods exported by land Date on which such goods pass the frontier
c Goods exported by post Date of dispatch of goods by the post office concerned to a place outside India

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In case of services

Sl. No. Case Relevant Date
1 The supply of services was completed prior to receipt of payment Date of receipt of payment in convertible foreign exchange, or in Indian rupees wherever permitted by the RBI
2 Payment for the services was received in advance, prior to the date of issue of the invoice Date of issue of the invoice

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The refund formula: Rule 89(4)

Refund Amount = Turnover of ZRS of goods + Turnover of ZRS of services Adjusted Total Turnover × Net ITC
  • Turnover of zero-rated supply of goods — the value of zero-rated supply of goods made during the relevant period without payment of tax under bond or LUT, or the value which is 1.5 times the value of like goods domestically supplied by the same or a similarly placed supplier, as declared by the supplier, whichever is less.
  • Turnover of zero-rated supply of services means (1 + 2 − 3):
    1. Payments received during the relevant period for zero-rated supply of services made during the relevant period.
    2. Zero-rated supply of services where the supply has been completed, for which payment had been received in advance in any period prior to the relevant period.
    3. Value of advances received for zero-rated supply of services during the relevant period for which the supply has not been completed during the relevant period.
  • Adjusted Total Turnover means the sum total of the value of:
    1. The turnover in a State or Union territory, excluding the turnover of services (i.e. zero-rated goods turnover as computed above, plus domestic supply of goods, plus export goods excluded from zero-rated turnover, such as goods subject to export duty).
    2. The turnover of zero-rated supply of services determined above and non-zero-rated supply of services, excluding the value of exempt supplies other than zero-rated supplies during the relevant period.
  • Net ITC — input tax credit availed on inputs and input services during the relevant period.
  • Relevant period — the period for which the refund claim has been filed.
Value of goods exported is taken as the lower of: (i) the Free on Board (FOB) value declared in the Shipping Bill or Bill of Export, as per the Shipping Bill and Bill of Export (Forms) Regulations, 2017; or (ii) the value declared in the tax invoice or bill of supply.

Practical example

A Hyderabad-based manufacturer has domestic and export supplies as follows for the relevant period:

Item Nature Value / Note
Product 'A' Export supply Rs 10,00,000 (value if sold domestically = Rs 5,00,000)
Product 'B' Domestic supply Rs 3,00,000
Product 'F' Export supply Rs 9,00,000 (domestic value Rs 8,00,000, but subject to export duty)
Service 'C' Export supply Rs 7,00,000 (payment received for ZRS made during the period)
Service 'D' Export supply Rs 2,00,000 (ZRS completed in the relevant period, payment received in advance)
Service 'E' Export supply Rs 1,00,000 (ZRS to be made; payment received in the relevant period)
Service 'G' Domestic supply Rs 2,00,000
Product 'J' Exempt supply Rs 1,00,000
ITC on goods Rs 1,00,000
ITC on services Rs 1,00,000
ITC on capital goods Rs 5,00,000

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Calculation of refund

Particulars Workings Amount (Rs)
Turnover of zero-rated supply of goods Lower of 10,00,000 and (5,00,000 × 1.5 = 7,50,000) 7,50,000
Turnover of zero-rated supply of services 7,00,000 + 2,00,000 − 1,00,000 8,00,000
Adjusted Total Turnover 3,00,000 + 9,00,000 + 2,00,000 + 7,50,000 + 8,00,000 29,50,000
Net ITC 1,00,000 (goods) + 1,00,000 (services) 2,00,000
Maximum Refund Amount = (7,50,000 + 8,00,000) × 2,00,000 ÷ 29,50,000 1,05,085

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Eligible Refund Amount is Rs. 1,05,085/-

Notes:

  1. As Product 'F' is subject to export duty, it is not considered in zero-rated supplies for determination of the refund, but this value is still considered in Adjusted Total Turnover.
  2. Product 'J' is excluded from the calculation of Adjusted Total Turnover, as it is an exempt supply.
  3. ITC on capital goods is not considered in this refund computation.

How Kireeti Consultants Helps

Kireeti Consultants assists exporters with GST refund claims by helping them understand eligibility, calculate the refund amount, prepare supporting documentation, and comply with applicable GST requirements. Our experts help businesses minimise errors and streamline the refund process.

If you need assistance with calculating and claiming GST refunds on exports under LUT, our experts can help with documentation, refund calculations, application filing, and compliance. Contact our GST experts for professional assistance.

Frequently Asked Questions

1 What is the LUT route for GST refund on exports?
A Letter of Undertaking (LUT) lets a registered exporter supply goods or services without paying IGST, since exports are treated as zero-rated supplies under Section 16 of the IGST Act. The exporter can then claim a refund of the unutilised input tax credit accumulated on inputs and input services, subject to the two-year time limit from the relevant date.
2 What is the relevant date for claiming refund on export of goods?
For goods exported by air or sea, the relevant date is the date the ship or aircraft leaves India. For goods exported by land, it is the date the goods pass the frontier. For goods exported by post, it is the date of dispatch of goods by the post office concerned to a place outside India.
3 What is the relevant date for claiming refund on export of services?
If the supply of services was completed before payment was received, the relevant date is the date of receipt of payment in convertible foreign exchange or in Indian rupees, wherever permitted by the RBI. If payment was received in advance before the invoice was issued, the relevant date is the date of issue of the invoice.
4 Why can goods subject to export duty be excluded from zero-rated turnover?
Goods that are subject to export duty are not treated as zero-rated for the purpose of the Rule 89(4) refund formula, so their value is excluded from the turnover of zero-rated supply of goods used in the numerator, even though the same value is still included in Adjusted Total Turnover.
5 Can ITC on capital goods be claimed under this refund?
No. Net ITC for the Rule 89(4) refund formula covers only the input tax credit availed on inputs and input services during the relevant period; ITC on capital goods is not considered in this refund computation.
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