GST Refund Rules for SEZ Supplies: A Complete Guide for Developers & Units

Special Economic Zones (SEZs) are considered "foreign territories" within India for the purposes of indirect taxation. Under the Goods and Services Tax (GST) law, any supply made to an SEZ Developer or an SEZ Unit is treated as a Zero-Rated Supply.

This means that even though the transaction is happening within India, it is legally treated exactly like an Export of services or goods.

However, unlike standard exports, SEZ supplies require specific endorsements from SEZ officers to validate the "consumption" of the goods or services. Without these endorsements, your refund claim will be summarily rejected by the GST department.

This guide explains the GST refund rules for SEZ supplies, the necessary documentation, and the 2026 compliance standards.

Zero-Rating for SEZ: The Two Routes

Just like regular exports, you have two choices when supplying to an SEZ:

1. Supply with Payment of IGST

You charge IGST on your invoice, pay it in your GSTR-3B return, and then apply for a refund of that tax.

• Requirement: You must ensure the SEZ unit gives you a proof that the goods/services were for "Authorized Operations."

2. Supply under Letter of Undertaking (LUT)

You file an LUT for the financial year and supply to the SEZ without charging any tax.

• Requirement: You then claim a refund of your accumulated Input Tax Credit (ITC).

Mandatory Condition: "Authorized Operations"

Not every supply to an SEZ is zero-rated. A supply is only zero-rated if it is used for Authorized Operations as specified in the SEZ's "Letter of Approval" (LoA).

If you sell office furniture to an SEZ unit, and that furniture is for their registered office inside the zone, it is zero-rated. However, if you provide catering services for an employee's private wedding held at the SEZ unit, it is not an authorized operation and you must charge regular CGST + SGST (or IGST).

The Crucial Evidence: Endorsements

For SEZ supplies, the "Shipping Bill" exists only for physical goods. For services or goods transferred internally, the most critical document is the Endorsement by the Specified Officer (SO).

1. Receipt of Goods/Services: When the SEZ unit receives the supply, they must get the invoice endorsed (stamped and signed) by the SEZ Customs Officer.
2. SEZ Online Integration: In 2026, this process is primarily digital via the "SEZ Online" portal.
3. Refund Requirement: While filing the refund claim in Form RFD-01, you must upload a copy of this endorsement. If the officer in the SEZ has not endorsed your invoice digitally or physically, the GST officer will not process your refund.

Legal Reference

Relevant Law: Section 16 of the IGST Act, 2017 defines SEZ supplies as Zero-Rated. Rule 89(1) of the CGST Rules, 2017 provides the procedure for claiming refunds for supplies made to SEZ.

Time Limit for Refiling

You must file your refund claim within 2 years from the "Relevant Date."

• For Goods: The date on which the goods are admitted into the SEZ.
• For Services: The date of receipt of payment (or the date of the invoice if the payment was received in advance).

Who Should Apply for the Refund?

A unique rule for SEZ supplies is that either the Supplier or the Recipient (SEZ) can apply for the refund:

• Standard Case: The supplier pays the tax (or uses LUT) and claims the refund. This is the most common scenario.
• Exception Case: If the supplier doesn't want to handle the paperwork, the SEZ unit can pay the tax and claim the refund themselves, provided they haven't already taken Input Tax Credit on it.

Common Mistakes with SEZ Refunds

1. Mixing Domestic and SEZ Sales: Using a single Tax Invoice for a delivery where 50% of the goods go to a domestic office and 50% go to an SEZ office. You must issue separate invoices to ensure the SEZ portion can be endorsed separately.
2. Missing SEZ GSTIN: Filing the return with the SEZ unit's "Domestic" GSTIN. Many SEZ units have two registrations: one for their domestic operations (DTA) and one for their SEZ unit. Zero-rating only applies to the SEZ Unit GSTIN.
3. Forgetting Service Endorsements: Many service providers assume that because there is no "entry" at a physical gate, no endorsement is needed for services (like software consulting). However, you still need a certificate from the Specified Officer of the SEZ stating that the service was received for authorized operations.

Conclusion

Supplying to an SEZ is a high-volume opportunity for many Indian businesses, but it comes with a "Verification Tax" in the form of manual endorsements. To ensure your cash flow remains healthy in 2026, establish a protocol where your delivery team doesn't leave the SEZ premises without a physical or digital confirmation of the "Authorized Operation" check. Without this proof, your zero-rated supply could be re-classified as a taxable domestic sale during a GST Audit.