Key Takeaways

• A back-to-back LC uses the end buyer’s master LC as support for a second LC issued to the supplier.
• The structure is commonly used by commodity re-sellers, intermediaries, distributors, and trading houses that need supplier payment support.
• The re-seller remains exposed to timing, document discrepancy, price, shipment, quality, and bank acceptance risk.
• Banks usually require margin, credit approval, clean LC wording, acceptable counterparties, and a controllable document flow.
• Back-to-back LC execution is documentation-heavy and requires alignment between the sale contract, purchase contract, Incoterms, inspection terms, shipping documents, and banking timetable.

What Is A Back-to-Back Letter of Credit?

A back-to-back letter of credit is a trade finance structure involving two separate documentary credits. The first LC, often called the master LC, is issued by the end buyer’s bank in favor of the commodity re-seller. The second LC, often called the back-to-back LC or secondary LC, is issued by the re-seller’s bank in favor of the upstream supplier.

The second LC is supported by the first LC, but it is a separate bank undertaking. The supplier cannot draw under the buyer’s master LC because the supplier is not the beneficiary of that LC. The supplier draws under the secondary LC issued in its favor. The re-seller draws under the master LC after presenting compliant documents to the master LC bank.

The bank issuing the secondary LC usually relies on the master LC, the re-seller’s credit profile, cash margin, assignment of proceeds, document control, and transaction economics. The master LC gives the bank comfort that proceeds should be available if the re-seller performs and presents compliant documents. It does not remove the bank’s need to approve the re-seller and the transaction.

How The Arrangement Works In A Commodity Resale

A typical commodity resale starts with a purchase order or sale contract between the end buyer and the re-seller. The buyer applies to its bank for a documentary letter of credit in favor of the re-seller. The master LC is usually issued by SWIFT MT700 and may be subject to UCP 600. The re-seller then asks its bank to issue a second LC to the supplier using the master LC as part of the credit support package.

The supplier ships the goods and presents documents under the secondary LC. The re-seller or its bank uses those documents, or substituted documents where permitted, to present under the master LC. The end buyer’s bank pays according to the master LC terms. The re-seller’s bank applies proceeds to reimburse the secondary LC exposure and releases the remaining trading margin after fees, financing costs, and reserves.

In commodity transactions, the documents usually carry the trade. The bank does not inspect the physical goods directly during ordinary LC processing. It reviews documents against the LC terms. That means small discrepancies in invoice description, bill of lading date, inspection certificate wording, packing list details, certificate of origin, insurance certificate, beneficiary name, vessel name, port, Incoterms, or shipment deadline can delay or block payment.

Typical Flow

• End buyer signs a sale contract with the commodity re-seller.
• Supplier signs a purchase contract with the re-seller.
• End buyer arranges a master LC in favor of the re-seller.
• Re-seller requests a back-to-back LC in favor of the supplier.
• Re-seller’s bank reviews the master LC, transaction documents, counterparties, margin, and security.
• Supplier ships the commodity and presents documents under the secondary LC.
• Re-seller presents compliant documents under the master LC.
• Master LC proceeds reimburse the secondary LC exposure.
• Re-seller receives the net trading margin after agreed deductions.

Key Parties In A Back-to-Back LC Structure

Why Commodity Re-Sellers Use Back-to-Back LCs

Commodity re-sellers use back-to-back LC structures because many physical trades require secured payment before goods move. Suppliers want bank-backed comfort before releasing cargo. Buyers want documentary control before paying. A re-seller caught between both parties may need a bank instrument that supports the supplier while allowing the re-seller to rely on the buyer’s LC for repayment.

1. Supplier Payment Support

The upstream supplier may require an LC before loading goods, releasing warehouse stock, nominating cargo, or issuing title documents. The secondary LC gives the supplier a bank undertaking from the re-seller’s bank, subject to compliant presentation.

2. Margin Protection

The re-seller can keep the supplier price and buyer price confidential. The supplier sees the secondary LC amount. The buyer sees the master LC amount. The spread between both credits represents the re-seller’s gross trading margin before financing costs, bank fees, inspection costs, insurance, freight, legal expenses, and reserves.

3. Reduced Upfront Cash Requirement

The structure can reduce the need for the re-seller to prepay the full supplier invoice. Banks may still require cash margin, collateral, or a credit line, but the master LC can support the issuance of the secondary LC when all conditions are acceptable.

4. Control Of The Documentary Chain

The structure gives the re-seller a way to manage documents, title, shipment, and payment through a bank-controlled process. This is useful for petroleum products, metals, agricultural commodities, fertilizers, chemicals, soft commodities, and other goods where payment depends on shipment and inspection documents.

Back-to-Back LC Versus Transferable LC

Back-to-back LCs and transferable LCs are often discussed together because both can help intermediaries finance resale transactions. The mechanics are different.

A transferable LC may be simpler when the buyer accepts it and the LC is expressly marked transferable. A back-to-back LC may be preferred when the re-seller needs separate credit wording, different supplier terms, or stronger commercial separation between the upstream and downstream legs.

Documents Required For A Back-to-Back LC Facility

A bank or trade finance arranger will usually require a full transaction file before approving a back-to-back LC. The file must show that the buyer’s LC, supplier contract, shipment terms, and repayment mechanics can work together without creating document gaps.

Commercial Documents

• End buyer sale contract or purchase order.
• Supplier purchase contract or proforma invoice.
• Commodity specification, grade, origin, quantity, and tolerance terms.
• Incoterms, loading port, discharge port, shipment window, and delivery schedule.
• Payment terms, price formula, currency, and bank charges allocation.
• Inspection, sampling, and quality control requirements.

Banking Documents

• Master LC draft or issued MT700.
• Secondary LC draft requested by the supplier.
• Re-seller corporate documents and signing authority.
• UBO disclosure, KYC pack, and sanctions screening information.
• Bank account details, existing credit lines, and trade finance limits.
• Assignment of proceeds or reimbursement undertaking where applicable.

Shipping And Control Documents

• Commercial invoice.
• Packing list or weight list.
• Clean on board bill of lading or other transport document.
• Certificate of origin.
• Insurance certificate or policy.
• Inspection certificate for quality and quantity.
• Warehouse receipt, tank receipt, or collateral management report where relevant.
• Phytosanitary certificate, fumigation certificate, health certificate, or analysis certificate for certain goods.

What Banks Review Before Issuing The Secondary LC

A bank issuing a back-to-back LC does not rely only on the existence of the master LC. It reviews the full credit and transaction risk. The bank needs comfort that the master LC proceeds will be available and that the re-seller can handle any document discrepancy, short shipment, quality claim, or buyer payment issue.

Main Risks In Back-to-Back LC Arrangements

Back-to-back LC structures can support commodity resale, but they carry tight execution risk. A small timing or document issue can create a large funding problem because two separate LCs must work together.

Document Discrepancy Risk

The supplier may present documents under the secondary LC that do not match the master LC requirements. If the secondary LC bank pays the supplier but the master LC bank rejects the re-seller’s presentation, the re-seller may owe reimbursement without receiving buyer-side funds.

Timing Mismatch

The secondary LC must allow enough time for supplier shipment and document presentation while preserving enough time for the re-seller to present under the master LC. Expiry dates, latest shipment dates, document presentation periods, and usance tenors must be mapped before issuance.

Price And Quantity Tolerance Risk

Commodity trades often include quantity tolerance, partial shipment, weight variations, price formulas, assay results, moisture adjustments, and quality deductions. The LC amounts and documents must account for these variables.

Bank Acceptance Risk

The re-seller’s bank may reject the master LC issuer, buyer country, supplier country, commodity type, shipment corridor, or documentary terms. Some banks will not issue back-to-back LCs for certain commodities, jurisdictions, or counterparties.

Fraud And Chain Risk

Broker-led commodity transactions often contain weak supplier proof, recycled documents, fake allocations, unverifiable warehouse receipts, false tank storage claims, and unsupported title assertions. Banks will require counterparty verification and document authenticity checks before taking exposure.

Where Back-to-Back LCs Are Used In Commodity Trade

The structure is most relevant where a re-seller has a confirmed buyer and credible supplier but lacks the working capital or credit line to prepay the supplier. It is used in physical commodity flows where documents can evidence shipment, quality, quantity, origin, and title.

• Refined petroleum products such as EN590, jet fuel, fuel oil, naphtha, and gasoil.
• Base metals such as copper cathodes, copper concentrate, aluminum, zinc, lead, and nickel.
• Agricultural commodities such as wheat, corn, soybeans, rice, sugar, coffee, cocoa, and edible oils.
• Fertilizers and chemicals where inspection, origin, and transport documents are central to payment.
• Soft commodities with controlled shipment and acceptable quality certification.
• Mineral ores and concentrates where assay, moisture, weight, and origin documentation drive payment.

Each commodity has its own document issues. Petroleum trades require tank storage, product allocation, SGS-style inspection, quality certificates, vessel nomination, and terminal procedures. Metals trades may require assay certificates, warehouse warrants, chain of custody evidence, sanctions review, and conflict minerals checks. Agricultural trades may require phytosanitary certificates, fumigation certificates, crop year details, GMO statements, and moisture or protein specifications.

How Re-Sellers Should Prepare Before Requesting A Back-to-Back LC

The fastest way to lose bank interest is to submit a vague trade with incomplete documents, unclear counterparties, weak supplier proof, and no margin analysis. A lender-ready request should show the full trade cycle from supplier invoice to buyer payment.

Prepare The Transaction Map

• Identify the buyer, supplier, re-seller, banks, freight parties, inspection firms, and storage parties.
• Map the contract chain, document chain, payment chain, title chain, and shipment route.
• Confirm the exact Incoterms on both legs of the transaction.
• Confirm who controls documents before payment and who bears demurrage, insurance, inspection, and storage costs.

Model The Margin

• Calculate buyer price, supplier price, freight, inspection, insurance, bank fees, confirmation fees, amendment fees, and financing costs.
• Include reserves for document discrepancies, shipment delays, commodity price movement, demurrage, and quantity tolerance.
• Confirm the remaining net margin after all transaction costs.

Control The LC Wording Early

• Review the master LC draft before issuance.
• Ensure the master LC terms can be satisfied using supplier-side documents or allowable document substitution.
• Align expiry dates, shipment dates, presentation periods, tenor, ports, documents, and description of goods.
• Avoid excessive document requirements that create unnecessary discrepancy risk.

Where Financely Fits

Financely helps commodity re-sellers assess whether a back-to-back LC structure is bankable before approaching lenders or banks. We review the buyer LC, supplier contract, trade economics, document flow, counterparty profile, shipment terms, inspection requirements, security package, and likely lender appetite.

Our role is to prepare the transaction for credit review. That can include structuring the LC flow, identifying documentation gaps, preparing a lender-ready transaction memo, mapping repayment mechanics, reviewing master LC terms, and helping the client approach suitable capital providers for back-to-back LC issuance, LC confirmation, trade loans, borrowing base facilities, or alternative commodity finance structures.

Back-to-back LC support is most relevant when the re-seller has real counterparties, signed or near-final contracts, clear shipment terms, acceptable goods, visible margin, and a buyer-side LC from a bank that a second bank can rely on. Broker chains, unverifiable allocations, unsupported proof of product, and speculative resale structures are usually declined quickly.

Frequently Asked Questions