What happens if the foreign buyer cancels the Master L/C after the BTB L/C is opened?

The exporter remains legally liable to pay the raw material supplier under the BTB L/C because documentary credits are independent transactions under UCP 600 Article 4.

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Module 10: Back-to-Back LC

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Concept & Mechanism of Back-to-Back L/C

Reading Time: 15 minLesson 30 of 105Comprehensive Master Manual

Lesson Contents Overview

1. Learning Objectives 2. Core Lesson Content 3. Department Comparisons 6. Real Factory Case Study 7. Trade Terminology 8. Interview Questions (2) 9. FAQs (2) 10. Key Takeaways 11. Resources & Downloads

Learning Objectives

Understand the statutory definition and working mechanism of a Back-to-Back L/C under Bangladesh Bank Foreign Exchange Guidelines.

Analyze the legal relationship between the export Master L/C (collateral) and the import BTB L/C (credit facility).

Identify key operational risks including tenure mismatches, cross-default liabilities, and supplier delivery defaults.

Execute the step-by-step factory workflow from Master L/C lien marking to raw material import endorsement.

Prev: Auditing L/C Clauses & Identifying Soft Clauses

Module 10•Lesson 30 of 105

Next: Opening Back-to-Back L/C for Raw Materials (Fabric & Trims)

Comprehensive Technical GuidanceTextbook & Training SOP

1. Introduction to Back-to-Back Letters of Credit

In the Bangladesh Ready-Made Garments (RMG) industry, raw materials—primarily woven fabrics, specialized synthetic yarns, zippers, buttons, and packaging—account for 60% to 75% of the total export garment value. Most export manufacturing units do not have the liquid cash reserves to prepay hundreds of thousands of dollars to overseas mills in China, India, Pakistan, or Taiwan.

The Back-to-Back Letter of Credit (BTB L/C) is the financial instrument that powers this multi-billion dollar trade. It allows an exporter to use a confirmed or authenticated export Master L/C (or registered Sales Contract) as collateral to open an import credit for raw materials without injecting upfront equity.

2. Core Legal and Banking Principles

Under Bangladesh Bank Guidelines for Foreign Exchange Transactions (GFET) and ICC UCP 600 Rules, the BTB L/C operates under strict regulatory controls:

Independent Contract (UCP 600 Article 4): Although the BTB L/C is born out of the Master L/C, it is legally an independent contract. If the buyer defaults on the Master L/C, the exporter's bank remains obligated to honor compliant documents submitted by the fabric supplier.
Lien on Master L/C Proceeds: The opening bank places an irrevocable lien over the proceeds of the Master L/C. When export proceeds arrive in US Dollars, the bank automatically debits the amount required to settle the maturing BTB liability.
Bonded Warehouse Integration: BTB imports enter Bangladesh duty-free under the factory's bonded warehouse license and Utilization Declaration (UD).

3. Step-by-Step BTB Lifecycle Workflow

Master L/C Vetting & Acceptance: Commercial team audits incoming MT700 for soft clauses, value, and shipment dates.
Proforma Invoice (PI) Finalization: Sourcing/merchandising team collects supplier PIs for fabric, thread, labels, and polybags.
Lien Registration: Exporter applies to their authorized dealer (AD) bank to mark a formal lien against the Master L/C.
BTB L/C Application: Commercial Officer submits BTB application form, supplier PI, UD copy, and Insurance Cover Note.
SWIFT MT700 Transmission: Bank transmits import BTB credit to the supplier's advising bank overseas.
Supplier Shipment & Document Arrival: Supplier ships fabric, submits shipping documents to their bank, and documents arrive in Bangladesh for customs clearance.
Export Execution & Settlement: Factory manufactures garments, exports them under the Master L/C, and realized funds liquidate the BTB loan.

4. Key Commercial Safeguards

Commercial Executives must enforce three mandatory date checks during BTB issuance:

BTB Shipment Date: Must be at least 20 to 30 days prior to the Master L/C latest shipment date to allow for ocean transit, customs clearance, cutting, sewing, and packing.
BTB Expiry Date: Must provide sufficient document presentation time in the supplier's country (typically 15–21 days after shipment).
Payment Tenure Matching: Ensure usance credit periods (e.g., 90 days UPAS) match the factory's cash conversion cycle.

Master L/C vs. Back-to-Back L/C Comparison

Parameter	Master Letter of Credit (Export)	Back-to-Back Letter of Credit (Import)
Applicant	Foreign Garment Buyer / Importer	Garment Factory / RMG Exporter
Beneficiary	Garment Factory / RMG Exporter	Raw Material Supplier (Yarn/Fabric/Trims Mill)
Primary Purpose	Payment guarantee for finished garments export	Payment guarantee for raw materials procurement
Governing Rules	ICC UCP 600 / ISBP 745	ICC UCP 600 & Bangladesh Bank GFET Vol-1
Financial Collateral	Buyer credit line at foreign issuing bank	Lien marked against export Master L/C
Shipment Timeline	Final export shipment date	Must be 15–30 days earlier than Master L/C

Practical Commercial Flow

BTB L/C Issuance for $100,000 Woven Shirt Export Order

A Dhaka garment factory receives a $100,000 Master L/C from a European buyer. With a 70% BTB entitlement limit, the factory's commercial bank opens two BTB L/Cs: (1) Fabric BTB L/C for $55,000 to a Chinese mill (90 days usance), and (2) Accessories BTB L/C for $12,000 to a local trims supplier. The total BTB value ($67,000) remains safely within the $70,000 ceiling.

Factory Real-Life Scenario

Scenario: A fabric supplier delayed shipment by 18 days under a BTB L/C, leaving the factory with only 7 days to sew and pack 20,000 shirts before the Master L/C shipment deadline.

Solution: The Commercial Officer immediately secured an emergency Master L/C shipment date extension (SWIFT MT707) from the buyer before the BTB fabric arrived, preventing a late shipment discrepancy.

Impact: Avoided $4,200 air freight penalty and preserved clean document presentation under UCP 600.

Commercial Officer Best Practice

Always verify that your Master L/C has no restrictive transfer clauses and that the opening bank is an approved credit-rated institution before applying for BTB limits.

Top Beginner Mistakes to Avoid

Opening BTB L/Cs with shipment dates too close to the Master L/C shipment date, leaving insufficient sewing time.
Failing to establish a formal bank lien on the Master L/C, resulting in rejected BTB application files.

Important Commercial & Trade Terminology (2 Terms)

Lien Marking

A legal lock placed by a commercial bank on an export Master L/C, reserving its proceeds exclusively to settle import BTB obligations.

💡 Note: Mandatory before any BTB credit is transmitted via SWIFT.

Tenure Mismatch

A situation where import BTB supplier payment matures before export sales proceeds are realized from the buyer.

💡 Note: Can cause temporary liquidity stress or Forced Loan creation.

Interview Preparation Questions & Answers (2 Questions)

Master these high-frequency interview questions for Commercial Officer, Merchandising, and Export Executive roles.

Frequently Asked Questions (2 FAQs)

Clear, beginner-friendly answers to the most common questions about the Commercial Department.

Yes, as long as the issuing bank has acceptable credit standing and the advising bank agrees to mark a lien without requiring third-party confirmation.

Key Takeaways & Summary Points

1A Back-to-Back L/C is an independent import credit opened by the exporter's bank in favor of a raw material supplier, collateralized by the export Master L/C.

2Under Bangladesh Bank rules, BTB L/Cs can only be opened against valid, authenticated, unencumbered Master L/Cs or registered Sales Contracts.

3The issuing bank holds a legal lien over the Master L/C proceeds to settle the BTB L/C liabilities upon export realization.

4The validity and shipment date of the BTB L/C must always precede the Master L/C shipment date by at least 15 to 30 days to allow production lead time.

Executive Lesson Summary

Back-to-Back L/Cs enable garment exporters to procure essential fabrics and trims duty-free without cash advances by leveraging export Master L/Cs as collateral under central bank regulations.