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A back-to-back letter of credit allows an intermediary to pay their supplier using the buyer's LC as the foundation for a second, separate instrument, without deploying their own working capital. The structure is more complex than a transferable LC and carries specific timing and documentation risks that must be managed precisely. Get the document chain right and it is one of the most effective tools available to commodity traders and trade intermediaries operating across multiple jurisdictions. Get it wrong and a single discrepancy or missed deadline can leave the intermediary exposed on both sides simultaneously.
Who this is for: Trading companies, commodity brokers, and intermediaries who have received a letter of credit from their buyer and need to open a second LC in favour of their supplier without committing their own capital. If the master LC does not permit transfer, or if you need to negotiate separate terms with your supplier, a back-to-back structure is the relevant instrument.
The back-to-back LC is frequently confused with the transferable LC because both structures involve an intermediary using a buyer's LC to pay a supplier. The distinction matters operationally and legally.
In a transferable LC, there is only one LC instrument. The first beneficiary, the intermediary, instructs the nominated bank to transfer part or all of the credit to a second beneficiary, the supplier. The supplier draws under the same LC, and the intermediary substitutes their own invoice for the supplier's before the documents are forwarded to the issuing bank. The structure is governed directly by UCP 600 Article 38.
In a back-to-back structure, two entirely separate LC instruments exist. The master LC is opened by the buyer's bank in favour of the intermediary. The secondary LC is opened by a separate bank, typically the intermediary's own bank, in favour of the supplier. The two LCs are independent obligations. The secondary LC does not reference the master LC in its text. The supplier draws under the secondary LC without knowledge of or involvement in the master LC.
| Factor | Back-to-Back LC | Transferable LC |
|---|---|---|
| Number of LC instruments | Two separate, independent LCs | One LC transferred in whole or in part to the supplier |
| Governing UCP 600 provision | No specific UCP 600 article governs the structure. Each LC is governed independently under UCP 600 | Governed directly by UCP 600 Article 38 |
| Master LC transfer permission required | No. Back-to-back can be used even when the master LC does not state it is transferable | Yes. The master LC must explicitly state it is transferable |
| Supplier visibility of buyer terms | None. Supplier only sees the secondary LC. Buyer and supplier commercial terms are entirely separate | Partial. Supplier sees the transferred LC, which mirrors the master LC terms except for amount and expiry |
| Intermediary margin protection | Strong. Invoice substitution is entirely within the intermediary's control and not subject to Article 38 constraints | Moderate. Invoice substitution is permitted under Article 38 but is conducted under tighter constraints |
| Bank risk and cost | Higher. The bank opening the secondary LC takes on an independent payment obligation to the supplier regardless of master LC outcome | Lower. One bank and one instrument involved. Transfer fees apply but overall cost is generally lower |
| Flexibility on supplier terms | High. The secondary LC can be structured with entirely different terms, currency, port of loading, and document requirements from the master LC | Limited. The transferred LC must reflect the same terms as the master LC except for amount, expiry, and price |
When to choose back-to-back over transferable: Use a back-to-back structure when the master LC is not transferable, when you need to negotiate different terms or currency with your supplier, when you need to protect your supplier identity from the buyer's bank, or when your supplier's bank is in a jurisdiction that does not have a relationship with the issuing bank of the master LC.
Back-to-back structures involve more parties than a standard single-LC trade, and the obligations of each party must be clearly understood before the structure is committed to.
Opens the master LC in favour of the intermediary through their bank. The buyer has no direct involvement in or knowledge of the secondary LC. Their obligation is to reimburse their bank when compliant documents are presented under the master LC.
The buyer's bank. Issues the master LC, transmits it via SWIFT MT700 to the advising bank, and makes the payment undertaking to the intermediary on compliant document presentation. Has no direct relationship with the secondary LC or the supplier.
The trading company, broker, or intermediary sitting between buyer and supplier. Receives the master LC, presents it to their own bank as the basis for opening the secondary LC, manages the document substitution process, and bears the risk of both LCs simultaneously if document flow breaks down.
Opens the secondary LC in favour of the supplier at the intermediary's instruction. Takes on an independent payment obligation to the supplier. Assesses the intermediary's creditworthiness and the quality of the master LC before agreeing to open the secondary LC. Bears credit risk on the intermediary if the master LC is not drawn.
Ships the goods, prepares the document set required under the secondary LC, and presents documents to their advising or confirming bank to draw payment. Has no knowledge of the master LC and no direct relationship with the buyer or the issuing bank.
The bank in the supplier's country that receives the secondary LC from the intermediary's bank, authenticates it, and advises the supplier. May also act as confirming bank if the supplier requires confirmation of the secondary LC.
The sequence below covers the complete lifecycle of a back-to-back LC from buyer instruction through to final settlement. Each step has timing and documentary implications that must be managed in parallel.
Timing is the most technically demanding aspect of a back-to-back LC structure. Three separate deadlines run simultaneously: the secondary LC expiry, the master LC presentation deadline, and the master LC expiry. If any one of them is missed, the structure fails and the intermediary can be left having paid the supplier with no ability to draw under the master LC.
The core timing rule: The secondary LC must expire before the master LC expires, and the gap between the two expiry dates must be long enough to allow for document transfer, invoice substitution, and re-presentation under the master LC. A minimum buffer of 7 to 14 banking days between the secondary LC expiry and the master LC expiry is standard practice. For transactions involving multiple ports or complex inspection requirements, a wider buffer is advisable.
Must be set early enough to leave adequate time for document examination under the secondary LC, transfer of documents to the intermediary, invoice substitution, and re-presentation under the master LC. The bank examining the secondary LC has up to five banking days under UCP 600. Add shipping and logistics time to determine a realistic secondary LC expiry.
Under UCP 600, the default presentation period is 21 days from the bill of lading date, provided this falls before the LC expiry. If the secondary LC shipment window is late in the master LC shipment window, the 21-day presentation period may not leave sufficient time for document substitution. Review both windows together when structuring.
The shipment window under the secondary LC must fall within the shipment window of the master LC. If the supplier ships within the secondary LC window but the bill of lading date falls outside the master LC window, the master LC presentation will be discrepant. Both shipment windows must be verified against realistic logistics timelines before the LCs are opened.
The intermediary's bank has five banking days to examine documents under the secondary LC. If the bank uses all five days and the documents then need correction before re-presentation under the master LC, the available window for master LC presentation shrinks rapidly. Build the timing model assuming maximum examination time at each stage.
The document chain in a back-to-back structure is more complex than in a standard LC because two separate document sets must be assembled, each compliant with its respective LC, and then merged through invoice substitution for the master LC presentation. Errors at any point in the chain can block payment under one or both instruments.
The back-to-back LC removes the need for the intermediary to deploy working capital, but it does not remove risk. The intermediary sits between two independent bank obligations and bears the consequences if either side of the chain fails to perform.
| Risk | Description | Mitigation |
|---|---|---|
| Supplier non-performance | The supplier fails to ship on time, ships non-conforming goods, or presents discrepant documents under the secondary LC. The intermediary cannot draw under the master LC without a compliant document set. The buyer may cancel or claim damages under the sale contract. | Third-party inspection at origin confirming goods match specification before shipment. Supplier performance history and references reviewed before the structure is committed. Adequate shipment window buffer built into both LCs. |
| Secondary LC payment without master LC recovery | The intermediary's bank pays the supplier under the secondary LC. The intermediary then presents discrepant documents under the master LC and the issuing bank refuses payment. The intermediary owes the secondary LC amount to their bank with no corresponding inflow from the buyer. | Rigorous document review against both LC texts before and after shipment. Experienced trade finance team conducting the substitution and re-presentation. Legal counsel review of both LC texts before either is opened. |
| Timing failure | Documents from the secondary LC presentation arrive too late for the intermediary to present under the master LC within the presentation period or before expiry. The master LC cannot be drawn. | Conservative timing model built with maximum bank examination time at each stage. Minimum 7 to 14 banking day buffer between secondary and master LC expiry. Direct communication with both banks on document flow timeline. |
| Issuing bank or country risk | The buyer's issuing bank fails to honour the master LC due to insolvency, sanctions, or force majeure events in the buyer's country. The intermediary has already paid the supplier. | Confirmation of the master LC by a bank in the intermediary's jurisdiction transfers the payment risk to the confirming bank. This is strongly advisable when the issuing bank is in a jurisdiction with elevated risk. |
| Document discrepancy on master LC | The substituted document set contains a discrepancy under the master LC terms that was not present under the secondary LC terms. The issuing bank refuses payment pending waiver by the buyer. | Pre-submission document check against the master LC text by an experienced trade finance team before the documents leave the intermediary's hands. Any discrepancies between the two LC terms identified and resolved by LC amendment before shipment. |
A back-to-back LC is a powerful instrument but it is not always the most efficient or lowest-cost solution for an intermediary trade. Understanding the conditions under which it adds the most value helps avoid unnecessary complexity on simpler transactions.
Related reading: For a broader view of how back-to-back LC structures fit within the wider commodity finance toolkit, including when to use a borrowing base facility instead of transactional financing, see our guide to structuring a commodity finance deal that banks will actually approve. For a detailed explanation of how DLCs work as standalone instruments, see our documentary letter of credit guide.
The intermediary's bank is not obligated to open a secondary LC simply because the intermediary holds a master LC. The bank is taking on an independent payment obligation to the supplier and will assess the transaction before committing. Understanding what the bank requires prevents delays at the critical moment between receiving the master LC and needing to open the secondary.
We work with commodity traders and intermediaries who need to structure back-to-back LC arrangements for complex multi-party trades. If you have received a master LC from your buyer and need to open a secondary LC in favour of your supplier, we can review the LC texts, advise on structuring the document chain, and connect you with the right banking counterparties. Submit your deal and we will revert with a structuring assessment within one business day.
Two separate, independent LC instruments used to finance a single trade transaction. The buyer opens a master LC in favour of the intermediary. The intermediary uses that LC as collateral to instruct their bank to open a secondary LC in favour of the supplier. The two instruments are independent but the document chains link together through the invoice substitution process.
A transferable LC is one instrument transferred to the supplier under UCP 600 Article 38. A back-to-back structure is two entirely separate instruments. Back-to-back is preferred when the master LC is not transferable, when separate terms with the supplier are needed, or when the intermediary needs to protect their supplier identity and margin from the buyer's bank.
The supplier presents their invoice at the purchase price under the secondary LC. Once the intermediary's bank has paid and holds the documents, the intermediary replaces the supplier's invoice with their own invoice at the higher sale price before presenting the full document set under the master LC. This protects the intermediary's margin and prevents the buyer's bank from seeing the purchase price.
The secondary LC must expire before the master LC, with enough buffer for document examination, transfer, and substitution. A minimum 7 to 14 banking day gap between secondary and master LC expiry is standard. The shipment windows under both LCs must also be aligned. Missing any deadline can leave the intermediary having paid the supplier with no ability to draw under the master LC.
Yes. The intermediary's bank takes on an independent payment obligation to the supplier under the secondary LC. If the master LC is not drawn for any reason, the bank must recover from the intermediary directly. This is why banks require a credit assessment and often a cash margin or collateral before opening the secondary LC.
When the master LC permits transfer and identical terms with the supplier are acceptable, a transferable LC is simpler and cheaper. When the buyer is paying on open account and has not issued an LC, a back-to-back structure is not available and pre-shipment or purchase order finance is the relevant solution instead.
Disclaimer: This content is informational and does not constitute legal, financial, or investment advice. Back-to-back LC structures, bank requirements, and document chain management vary significantly by transaction, jurisdiction, commodity, and banking counterparty. UCP 600 and ISBP 821 apply to each LC instrument independently. Obtain independent legal and trade finance counsel before committing to any back-to-back LC arrangement.
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