LUT or IGST-Paid: Two Export Routes, Two Failure Chains
GST exports run two routes: IGST-paid refunds move through ICEGATE's SB codes; LUT refunds through RFD-01 and deficiency memos. Rule 96B polices both.
One Decision at Registration, Two Different Machines
Before the first export invoice is cut, every GST-registered exporter makes a routing decision that determines which failure machine will process its refunds for the year: pay IGST on the export and reclaim it (the Rule 96 route), or export without payment under a Letter of Undertaking and reclaim unutilised input tax credit (the Rule 89 route). The two routes refund different money, through different systems, examined by different officers, failing in different ways — and much exporter frustration traces to diagnosing a Route-1 failure with Route-2 assumptions or vice versa.
The structural difference is where the application lives. On the IGST-paid route, the Shipping Bill itself is the refund application — Rule 96 deems it filed once the export manifest and a valid GSTR-3B exist, and the claim is processed automatically by ICEGATE. On the LUT route, there is no automatic anything: the exporter files FORM GST RFD-01 on the GST portal for the accumulated ITC, computed under Rule 89(4)'s formula, and a tax officer examines it. Same shipment, two different bureaucracies.
Route 1: IGST-Paid — the Customs Machine and Its Codes
The IGST-paid route's virtue is automaticity and its vice is brittleness. Because the refund runs on data matching between GSTN and ICEGATE, its entire failure surface is the validation chain this library documents exhaustively: the SB000–SB006 response codes, the SB005 invoice-number mismatch with its officer-interface fix, and the proviso that deems a mismatched application unfiled until rectified. Cash-flow-wise, the route front-loads an outflow (IGST paid on export value) to buy a fast, officer-free inflow — when the strings match.
Who should ride it: exporters with clean, reconciled document pipelines and the working capital to fund the IGST cycle — the refund of tax paid is typically larger and faster than an ITC refund, and requires no application, no deficiency correspondence, no formula. Who should not: exporters whose invoice identifiers, GSTINs or manifest data drift, for whom this route converts every formatting inconsistency into blocked cash.
Route 2: LUT — the Application Machine and Its Memos
The LUT route starts with a form and a clock. FORM GST RFD-11 — available to every registered person except those prosecuted for evasion above ₹2.5 crore (Notification 37/2017-Central Tax) — is furnished online and "shall be valid for the whole financial year in which it is tendered" (Circular 8/8/2017-GST): a renewal ritual every April that, missed, puts exports technically outside the LUT's cover. Rule 96A then embeds the deadline: if goods are not exported within three months of the export invoice (or the Commissioner's extended period), the exporter is "bound … to pay the tax due along with the interest" under s.50(1) within fifteen days of that expiry — the without-payment route retroactively becomes a with-payment event for the shipment that slipped.
The refund itself moves through RFD-01, and its characteristic failure is the deficiency memo (FORM GST RFD-03) under the master refund circular (125/44/2019-GST): a memo does not pause the application, it ends it — the exporter files afresh, with the limitation clock still running. The route's discipline is therefore documentary completeness at first filing: statements, invoices and the realization evidence that the e-BRC now supplies, assembled before submission rather than in response to a memo.
Rule 96B: The Clause That Chains Both Routes to Realization
One rule reaches across both routes and is routinely discovered too late. Rule 96B provides that where refund has been paid — either route, goods exports — and the sale proceeds are not realized within the FEMA realization period (or its extension), the refunded amount must be deposited back with interest — with restoration under sub-rule (2) where realization is later evidenced within three months of the date of realization. Every GST export refund is therefore provisional against the realization clock — and 2026's twice-moved clock means the Rule 96B exposure date differs by shipment bucket. A refund ledger that does not carry each shipment's realization due date is carrying an unquantified repayment liability.
Choosing, and Switching, With Eyes Open
The route decision is a risk-profile decision, restated: Route 1 trades working capital for speed and exposes you to string-matching; Route 2 trades officer examination and formula limits for zero tax outflow and exposes you to deadlines (LUT renewal, the 96A three-month clock) and memos. Mixed strategies are lawful — route selection is per-supply in principle — but each route's paperwork must then be internally complete, and the GSTR-3B tables must reflect the split correctly (3.1(b) for with-payment zero-rated supplies), since misplaced reporting stalls the Route-1 transmission entirely.
TradeWatch treats route integrity as a readiness check: LUT validity for the financial year, Rule 96A clocks per invoice, GSTR-3B table placement, and the realization due date behind Rule 96B, each flagged with a four-state verdict and its rule citation before filing. Kanan Labs prepares a readiness packet. It does not file Shipping Bills or GST returns, holds no customs credentials, and offers no tax advice — your licensed CHA files, and your tax decisions rest with you and your advisors.
- Rule 96, CGST Rules, 2017 — Refund of integrated tax paid on goods exported out of India
- Rule 96A, CGST Rules, 2017 — Export under bond or Letter of Undertaking
- Rule 89, CGST Rules, 2017 — refund of unutilised ITC (FORM GST RFD-01)
- Rule 96B, CGST Rules, 2017 — recovery of refund where export proceeds are not realized
- CBIC Circular No. 8/8/2017-GST — Letter of Undertaking in place of bond (04.10.2017), with Notification No. 37/2017-Central Tax
- CBIC Circular No. 125/44/2019-GST — Master circular on electronic refund processing (18.11.2019)