How Back-to-Back Letters of Credit Function
A back-to-back letter of credit is a trade-finance structure used by intermediaries, traders and resellers who sit between a buyer and a supplier. It can help them complete a transaction without paying the supplier from their own cash upfront.
In simple terms, the buyer’s letter of credit gives the intermediary’s bank enough comfort to issue a separate letter of credit in favour of the supplier. The intermediary earns the difference between the buyer’s price and the supplier’s price.
The basic transaction
Imagine a commodity trader agrees to sell coffee to a buyer in Europe for USD 1 million. The trader does not own the coffee. Instead, it will source it from a producer for USD 850,000.
The buyer issues a documentary letter of credit, known as the master LC, in favour of the trader for USD 1 million. The trader then asks its bank to issue a second LC to the producer for USD 850,000.
The producer ships the coffee and presents the required documents to its bank. If those documents comply with the terms of the second LC, the producer is paid. The buyer then receives the shipment documents under the master LC and pays the USD 1 million. The trader’s gross margin is USD 150,000, before bank charges, insurance, freight and other costs.
This is why a back-to-back LC is often useful in commodity trade, where traders need to move quickly but may not wish to tie up cash in every purchase.
Two separate letters of credit
The key point is that there are two independent instruments:
- The master LC is issued by the buyer’s bank in favour of the intermediary.
- The second LC is issued by the intermediary’s bank in favour of the supplier.
The intermediary’s bank does not simply “pass on” the first LC. It reviews the master LC and decides whether it is sufficiently bankable to support the issuance of the second one. It will consider the issuing bank, the underlying goods, the shipment route, the documents required and the trader’s own credit profile.
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The second LC must be carefully drafted. It will usually have a lower value than the master LC, because it reflects the supplier’s sale price. It must also allow enough time for the supplier to ship, present documents and correct any discrepancies before the intermediary needs to present under the master LC.
Why businesses use them
Back-to-back LCs are particularly useful for an intermediary that wants to protect its commercial relationships. The buyer may not know the identity of the supplier, and the supplier may not know the identity of the end buyer.
They can also help a trader handle larger orders than its available working capital would otherwise permit. That does not mean the structure is automatic or risk-free. Banks still expect a genuine underlying transaction, creditworthy parties, clear contracts and documents that match across both LCs.
For recurring transactions, traders may combine this approach with broader structured trade finance arrangements to manage purchasing, inventory and receivables more consistently.
The documents matter as much as the goods
Letters of credit are document-based instruments. Banks pay against compliant documents, not because they have inspected the cargo themselves.
Typical documents can include a commercial invoice, packing list, bill of lading, certificate of origin, inspection certificate and insurance certificate. If the supplier’s documents do not match the wording of the second LC, payment can be delayed or refused. If the trader then cannot present compliant documents under the master LC, it may face a funding gap.
That is why the two LCs need to be aligned from the start. The description of goods, quantities, quality specifications, ports, shipment dates and document requirements must work together. A minor mismatch can become an expensive problem once goods are already in transit.
Back-to-back LC versus transferable LC
A back-to-back LC is often confused with a transferable LC. They serve similar commercial purposes but work differently.
A transferable LC allows the first beneficiary, usually the intermediary, to transfer all or part of the credit directly to a second beneficiary, usually the supplier. There is only one original LC.
A back-to-back structure creates a new and separate LC for the supplier. This can give the intermediary more control over pricing and disclosure, but it may require more bank underwriting and generate higher fees. The right choice depends on the transaction, the banks involved and the need for confidentiality. Here is a fuller comparison of a transferable LC versus a back-to-back LC.
What can go wrong?
The main risks are straightforward: the buyer may not be creditworthy, the supplier may fail to perform, documents may be discrepant, or the cargo may not meet contract specifications. There can also be sanctions, fraud, shipping and country-risk considerations.
A well-structured transaction starts with credible counterparties, a clear sales contract, a clear purchase contract and a realistic timeline. Banks are more likely to support transactions that show a genuine trade flow rather than a paper-only arrangement.
For a deeper overview of the process, costs and structuring considerations, see Financely’s guide to back-to-back letters of credit and its overview of back-to-back LC costs.
