Complete Guide to GST and Compliances for Import and Export Businesses in India

Import and export businesses deal with a tax system that runs on two clocks at once: GST, which applies the moment goods or services cross a state or national border, and customs, which has its own valuation rules, its own documentation, and its own timelines. The two are meant to work together, an IGST paid at the port becomes input tax credit, an export invoice becomes a zero-rated supply, but the coordination between DGFT, customs, and the GST portal is exactly where most import-export businesses lose time and money.

This guide covers the licenses an import-export business needs, how GST applies differently to imports and exports, the LUT and refund mechanics that keep cash flow moving, and the mistakes that most often get shipments held up or refunds delayed.

Licenses an Import-Export Business Needs

Import Export Code (IEC). A 10-digit number issued by the DGFT, and the foundational licence for any import or export activity. Without it, customs won't clear a shipment and banks won't process the foreign remittance tied to it. It's linked to the business PAN and technically has lifetime validity, but every IEC holder must complete an annual update on the DGFT portal between April and June each year, even if nothing has changed. Miss the window and the IEC is automatically deactivated on 1 July, which means shipping bills and bills of entry get rejected at customs until it's reactivated.

GST Registration. Essential for import-export businesses; importers pay IGST at customs and need a valid GSTIN to claim that as input tax credit, and exporters need GST registration to file a Letter of Undertaking or claim IGST refunds. See the registration rules for goods versus services below, since they differ.

AD Code Registration. An Authorised Dealer code from the bank handling foreign exchange transactions, registered with customs so that export proceeds and duty drawback can be credited correctly. Recent changes to the port framework have simplified this so a single AD Code registration now typically applies across ports, rather than needing separate registration at every port a business ships from.

ICEGATE Registration. The Indian Customs EDI Gateway is where shipping bills and bills of entry are filed electronically. Registration needs the IEC, PAN, and a Digital Signature Certificate, and this is the system customs data flows through before it reaches the GST network.

RCMC (Registration cum Membership Certificate). Optional, but needed if the business wants to claim scheme benefits like RoDTEP or Advance Authorisation through the relevant Export Promotion Council, such as FIEO for general exports or a product-specific council for a particular category.

Product-specific certifications. BIS certification for notified products, FSSAI licensing for food exports, and phytosanitary certificates for agricultural and plant-based exports are common additional requirements depending on what's being traded.

Read our complete GST registration process guide and the documents required for GST registration before applying, and use our NIC code list to select the correct trade classification.

GST Registration Rules for Import and Export Businesses

This is where goods and services diverge sharply, and mixing up the two rules is a common early mistake.

Import and export of goods. Since this counts as interstate (or cross-border) supply of goods, GST registration is compulsory under Section 24 of the CGST Act regardless of turnover. There's no ₹40 lakh cushion here; a business exporting or importing physical goods needs to register from its very first transaction.

Export of services. Service exporters get the benefit of the standard threshold, ₹20 lakh (₹10 lakh in special category states), because interstate and cross-border supply of services doesn't force compulsory registration below the threshold the way goods do. That said, most service exporters register voluntarily well before the threshold, since registration is what unlocks LUT filing and ITC refunds, and without it there's no route to zero-rated treatment at all.

Anyone acting as an e-commerce seller exporting physical products through platforms like Amazon Global Selling or Etsy, or running a dropshipping model that sources internationally and ships to Indian or overseas customers, falls under the goods rule above, not the services one. See our dropshipping and GST guide for how place-of-supply works in that model, and our GST turnover limit guide for how aggregate turnover is calculated where it does apply.

How GST Applies to Imports

Import of goods attracts IGST at the point of customs clearance, calculated on the assessable value plus Basic Customs Duty and any applicable cess, not on the invoice value alone. This IGST is paid before the goods are released and isn't optional or deferrable in the ordinary course. The importer can claim this IGST as input tax credit, but only against a valid Bill of Entry, not against the overseas supplier's commercial invoice; the Bill of Entry is the document GST law actually recognises for this credit; a business that tries to claim import ITC off the commercial invoice alone will find the credit doesn't reconcile.

Import of services works differently: IGST is payable by the Indian recipient under reverse charge, self-assessed and paid through the regular GST return rather than at a port. There's a specific exception for OIDAR services (online information and database access, think overseas SaaS and digital subscriptions) supplied to unregistered recipients, where the foreign supplier itself is expected to register and discharge GST in India through a simplified scheme.

How GST Applies to Exports: Zero-Rating, LUT, and Refunds

Export of goods or services is treated as a zero-rated supply under Section 16 of the IGST Act, meaning 0% GST is charged, but unlike an exempt supply, the exporter still keeps the right to claim input tax credit on everything used to make that export. This distinction matters: an exempt supplier loses ITC on related inputs entirely, while a zero-rated exporter doesn't.

There are two routes to actually realise this:

Letter of Undertaking (LUT). Filed in Form GST RFD-11 on the GST portal, an LUT lets a GST-registered exporter ship goods or supply services without paying IGST upfront at all. In exchange, the exporter commits to exporting within the prescribed timeline, typically three months for goods and one year for services from the invoice date, and to receiving payment in convertible foreign exchange (or permitted INR) within a further period. Any input tax credit accumulated on inputs used for the export then gets refunded through Form GST RFD-01. Filing LUT takes minutes once the GSTIN is active, but it has to be filed before the export invoice date, not after. An invoice raised before that year's LUT is on file cannot be retroactively treated as zero-rated once the invoice date has passed, and IGST becomes payable on that specific shipment.

Pay IGST and claim refund. The alternative is paying IGST on the export upfront and claiming it back later, either automatically (for goods, once the shipping bill data matches GSTR-1 and GSTR-3B through ICEGATE) or via Form RFD-01 for accumulated ITC. This route ties up working capital for the two to six months a refund typically takes, which is why almost every regular exporter prefers the LUT route instead. A business can use both routes for different transactions within the same year, provided a valid LUT is on file for the shipments it wants to route through LUT.

Refund applications only get processed once the relevant GSTR-1 and GSTR-3B returns are filed; pending returns block the refund workflow entirely, regardless of how clean the underlying export documentation is.

Input Tax Credit for Import-Export Businesses

Since export is zero-rated rather than exempt, ITC on inputs, raw materials, packaging, freight, and services used to fulfil an export order remains fully claimable and refundable, which is one of the strongest positions available to any GST-registered business. That said, standard ITC rules still apply on top: credit depends on the supplier filing correctly and the invoice showing up in GSTR-2B, and Section 17(5) blocked-credit categories apply the same way they would for a domestic business. See our guides on how to calculate input tax credit, whether ITC applies to all purchases, and the 180-day payment rule under Section 16(2). The Invoice Management System is worth using actively for import-export businesses working with a wide vendor base across freight, customs house agents, and packaging suppliers, since it catches GSTIN mismatches before they hold up an ITC claim.

Common GST Mistakes in Import-Export Businesses

Missing the IEC annual update. The single most disruptive, entirely avoidable mistake in this sector. An IEC that isn't updated between April and June deactivates automatically on 1 July, and the first sign of trouble is often a shipment stuck at port because customs won't accept the shipping bill or bill of entry against a deactivated code.

Filing LUT after the first export invoice of the year. LUT has to be in place before the invoice date, not filed reactively once someone notices IGST wasn't charged. A fresh LUT is needed every financial year; carrying over last year's filing isn't valid for the new year's invoices.

Assuming goods exporters get the same registration threshold as service exporters. Exporting physical goods triggers mandatory GST registration from the first transaction, with no turnover exemption, unlike export of services, which does get threshold relief. Businesses that start small and assume they have room to grow before registering often discover the goods rule doesn't give them that room.

Claiming import ITC off the commercial invoice instead of the Bill of Entry. The Bill of Entry is the document that establishes IGST paid at customs as valid input tax credit. Reconciling against the supplier's invoice alone, without matching it to the Bill of Entry, produces credit claims that don't hold up on review.

HS code errors between customs and GST filings. A wrong HS code doesn't just misclassify a shipment for GST; it changes the duty calculation, affects scheme eligibility for benefits like RoDTEP, and typically draws a query from the assessing customs officer. Our HSN and rate structure guide is useful context, though customs tariff classification and GST HSN classification, while related, need to be checked against each other rather than assumed identical.

Value mismatches across shipping documents. The commercial invoice, packing list, and shipping bill all need to show the same value. Even small discrepancies get flagged and reassessed by customs, which delays clearance and, downstream, delays the GST refund that depends on clean shipping bill data.

Receiving export payment in INR without checking RBI netting rules. If a foreign client pays in Indian rupees rather than convertible foreign exchange, the transaction may not qualify as an export of services under GST unless it meets specific RBI trade-based netting guidelines, which changes the zero-rating position entirely.

Letting pending GST returns block a refund that's otherwise ready. Refund applications, whether for accumulated ITC under LUT or for IGST paid upfront, only process once GSTR-1 and GSTR-3B for the relevant period are filed. A business that's behind on routine filing effectively freezes its own export refunds until it catches up. Our GST return filing guide and GST due date calendar help avoid this, and if a GSTIN does get flagged for delays, our guide to GSTIN blocking rules explains how restoration works. GST late fees apply here just as they would for any other business, and our GST notice reply guide covers how to respond if a mismatch between customs and GST data draws a query.

Frequently Asked Questions

Does a small export business need GST registration if it's below the ₹20 lakh threshold?

It depends on what's being exported. Goods exporters must register regardless of turnover, since export of goods is treated as compulsory-registration interstate supply. Service exporters get the standard ₹20 lakh threshold, though most register voluntarily anyway to access LUT and ITC refunds.

What happens if I miss the IEC annual update?

The IEC deactivates automatically on 1 July following the missed April-June update window. Reactivation on the DGFT portal is usually quick once completed, but any shipment attempted while it's deactivated will be rejected at customs.

Can I claim GST credit on the IGST I paid at customs for an import? Yes, provided the claim is matched to a valid Bill of Entry, not just the overseas supplier's commercial invoice.

Is LUT compulsory for exports?

Not compulsory, but strongly preferred. Without it, IGST has to be paid upfront on every export and then claimed back through a refund process that typically takes two to six months, tying up working capital in the meantime.

Does export of services always qualify for zero-rating?

Only if all the conditions under Section 2(6) of the IGST Act are met, including that payment is received in convertible foreign exchange or RBI-permitted INR. Payment received in ordinary INR without meeting the netting guidelines can disqualify the transaction from export treatment.

Get Your Import-Export GST Compliance Right

Between mandatory registration for goods exporters, LUT deadlines tied to the financial year, IGST reconciliation between Bill of Entry data and GST returns, and refund workflows that stall the moment a routine return goes unfiled, import-export GST compliance has more moving parts, and more places for a shipment or a refund to get stuck, than almost any domestic business model.

GST Registration helps import-export businesses handle GST registration, LUT filing, IGST and ITC reconciliation, and monthly return filing, so cash tied up in refunds and shipments doesn't sit stuck any longer than it has to.

Talk to a GST expert today and get your import-export compliance reviewed before your next shipment or filing deadline.