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A back-to-back letter of credit lets a trader buy goods from a supplier and sell them to an end buyer without putting up the full purchase price in cash. The trader uses the letter of credit it receives from its buyer as support for a second, separate letter of credit issued in favour of its supplier. Done properly, it is one of the most capital-efficient tools in commodity and goods trading. Done badly, it leaves the intermediary's bank holding a payment obligation with no matching source of repayment.
This guide explains how back-to-back LCs work, how the two credits must be matched field by field, what banks require before they will issue one, how they compare with transferable credits, and how Financely helps trading companies structure and place them with banks that actually provide this facility.
In this guide
A back-to-back letter of credit is a pair of documentary credits used in a single trade chain. The first credit, usually called the master, export or prime LC, is issued by the end buyer's bank in favour of an intermediary such as a trading company. The intermediary's bank then issues a second credit, the back-to-back, secondary or baby LC, in favour of the intermediary's supplier, relying on the master LC as its main security.
The two credits are legally independent. The bank that issues the back-to-back LC must pay the supplier against complying documents whether or not the master LC is eventually honoured. That independence is what makes the structure useful to the supplier and risky for the issuing bank, and it explains why banks are selective about who they offer it to.
Back-to-back LCs are most common in physical commodity trading, metals, agricultural products, fertilisers, textiles and manufactured goods, wherever a trader sits between a producer and a buyer and does not want either side to know the other, or cannot fund the purchase from its own balance sheet. If you are new to letters of credit generally, start with our overview of documentary letter of credit services for importers and exporters.
The end buyer applies to its bank for the master LC in favour of the intermediary. The strength of that bank, and whether the credit is confirmed, largely decides whether the intermediary's bank will accept it as security.
The trader is beneficiary of the master LC and applicant of the back-to-back LC. Its bank advises or confirms the master LC, issues the back-to-back LC, and later substitutes the trader's invoice for the supplier's when presenting under the master.
The supplier is beneficiary of the back-to-back LC. It ships the goods and presents documents through its own bank, and it gets paid by the intermediary's bank if the documents comply.
The two credits mirror each other on goods, shipment and documents, but differ on price, amount, dates and the identity of the parties. Those differences are where the trader's margin and the bank's protection both sit.
A trading company in Dubai sells 10,000 metric tonnes of steel rebar to a buyer in West Africa at USD 620 per tonne, CFR. It buys the same cargo from a mill in Turkey at USD 580 per tonne, FOB plus freight arranged by the trader. The buyer's bank issues a master LC, confirmed by an international bank. The trader's bank issues a back-to-back LC to the mill.
| Term | Master LC (from end buyer) | Back-to-back LC (to supplier) |
|---|---|---|
| Unit price | USD 620 per MT | USD 580 per MT |
| Amount | USD 6,200,000 | USD 5,800,000 |
| Quantity tolerance | Plus or minus 5% | Plus or minus 5% |
| Latest shipment date | 31 May | 31 May |
| Presentation period | 21 days after shipment | 10 days after shipment |
| Expiry | 30 June | 20 June |
| Beneficiary | Trader | Supplier |
The margin. The trader's gross margin is USD 400,000, or about 6.5% of the master LC amount, before freight, insurance, inspection and bank charges.
The substitution window. Because the supplier must present within 10 days of shipment and the trader has 21 days under the master LC, the bank has roughly 11 days to examine the supplier's documents, substitute the invoice and present under the master LC. Getting this window right is the most important part of the structure. If it is too short, the master LC presentation can be late even though the supplier presented on time.
The bank's exposure. The trader's bank is committed to pay USD 5,800,000 to the supplier. Its expected source of repayment is USD 6,200,000 under the master LC. Its residual risks are a discrepancy in the substituted documents, a failure of the master LC issuing or confirming bank, or a mismatch between the two credits. Its credit line or cash margin from the trader covers those risks.
Most back-to-back LCs are issued as SWIFT MT700 messages. The table shows how each key field in the back-to-back LC should relate to the same field in the master LC. This is the checklist your bank's trade operations team will use, and getting it right before you apply saves days of back and forth.
| MT700 field | Back-to-back LC relative to master LC |
|---|---|
| 40A Form of credit | Irrevocable. Both credits should be irrevocable and the master LC should not be transferable if a back-to-back structure is being used. |
| 31D Date and place of expiry | Earlier than the master LC, with enough time for substitution and presentation. Expiry place ideally at the intermediary's bank's counters. |
| 32B Currency and amount | Same currency, lower amount, reflecting the purchase price. |
| 39A Percentage tolerance | Same or narrower tolerance, so the supplier cannot ship a quantity the master LC will not accept. |
| 41a Available with, by | Consistent payment terms. If the master LC pays at 90 days, a sight back-to-back LC creates a funding gap the bank must finance. |
| 44E / 44F Ports | Same port of loading and discharge, or a narrower range. |
| 44C Latest shipment date | Same or earlier. |
| 45A Goods description | Consistent with the master LC. It can be less detailed if needed for confidentiality but must not conflict. |
| 46A Documents required | The same documents, issued so they can be presented under the master LC unchanged, apart from the invoice and draft. Insurance cover, if required, may need a higher percentage to meet the master LC's requirement. |
| 47A Additional conditions | Must carry every condition from the master LC that affects the supplier's documents, plus clauses allowing invoice substitution and third-party documents where needed. |
| 48 Period for presentation | Shorter than the master LC, leaving a substitution window. |
| 49 Confirmation instructions | Set by the supplier's requirements. Confirmation of the back-to-back LC is a separate cost the trader usually bears. |
Third-party and neutral documents. If the trader does not want the end buyer to see the supplier's name, or the supplier to see the end buyer's, the master LC should accept third-party documents and the back-to-back LC should call for neutral documents where possible. The bill of lading is usually the hardest document to neutralise, because shipper and notify party details can reveal the chain. Agree how this will be handled before either LC is issued. A switch bill of lading may be possible, but it adds cost and the bank must agree to it.
Many back-to-back LC problems end up as document discrepancies at presentation. Our guide to common LC discrepancies under UCP 600 explains the ones banks reject most often and how to draft around them.
Most documentary credits are issued subject to the ICC's Uniform Customs and Practice for Documentary Credits, UCP 600. Each of the two credits in a back-to-back structure is subject to UCP 600 in its own right, but UCP 600 does not contain a specific article on back-to-back credits. They are a banking practice built from two ordinary credits, not a separate instrument.
That is the key difference from transferable credits, which UCP 600 does regulate in Article 38. Under a transferable credit, the first beneficiary asks the transferring bank to make the same credit available to a second beneficiary, and Article 38 sets out which terms can be reduced or curtailed. With a back-to-back LC, there is no transfer. The second credit is a new undertaking, and the issuing bank takes full credit risk on it.
Document examination under both credits follows the ICC's International Standard Banking Practice, currently ISBP 821. Because the trader's bank examines documents twice, once as issuing bank of the back-to-back LC and once before presenting under the master LC, any inconsistency between the two credits shows up as a discrepancy under one of them.
A back-to-back LC is not the only way to finance an intermediated trade. Banks and traders choose between several structures depending on the trader's balance sheet, the buyer's willingness to cooperate and the need for confidentiality.
| Structure | How it works and when it fits |
|---|---|
| Back-to-back LC | Two independent credits. The trader's bank issues a new LC against the master LC. Flexible on terms and confidentiality, but needs a credit line or margin and full bank risk appetite. |
| Transferable LC | One credit, issued as transferable at the buyer's request, then transferred in part to the supplier under UCP 600 Article 38. Lower cost and less credit risk for the trader's bank, but the buyer must agree and terms can only be reduced within Article 38. |
| Assignment of proceeds | The trader assigns part of its future proceeds under the master LC to the supplier. Simple and cheap, but the supplier only gets paid if the trader presents compliant documents, so many suppliers will not accept it. |
| Standby LC or guarantee to supplier | The trader's bank issues a standby LC as payment security on open account terms. Useful for repeat trade, but it needs a full credit line because there is no master LC as security. |
| Transactional trade finance facility | A lender finances the purchase against the goods and the sale contract, often with collateral management and an assignment of the sale proceeds. Suits traders with recurring flows; see our structured trade and commodity finance guide. |
When to choose a back-to-back LC. It is usually the right structure when the buyer will not issue a transferable credit, when the supplier insists on its own LC with its own terms, when price and party confidentiality matter, or when the payment terms in the two contracts differ. When the buyer will cooperate and terms are close, a transferable LC is normally cheaper and easier to get approved.
Back-to-back LCs are a credit product, not an operational service. The trader's bank is taking a payment risk on the supplier credit, so it underwrites the trader and the transaction. Banks that offer the facility typically look at five things.
An acceptable master LC. Issued or confirmed by a bank the trader's bank accepts on credit and country risk, irrevocable, available with the trader's bank, and drafted so the supplier's documents can be presented under it.
A credit line or cash margin. Most banks will not rely on the master LC alone. They require an approved trade line for the trader or a cash margin against the back-to-back LC. New relationships often start with a significant margin that reduces as the bank gains experience with the trader.
Trading track record. Evidence the trader has done similar trades in the same commodity and corridor, with audited or management accounts, completed contracts and references from counterparties.
Clean KYC on every party. The bank screens the trader, buyer, supplier, vessel and ports for sanctions, dual-use goods and trade-based money laundering risk. Unclear ownership or a sanctioned route will stop the deal regardless of pricing.
Matching contracts and logistics. Signed sale and purchase contracts, a credible logistics plan, inspection arrangements and insurance that align with both credits.
Why many traders get declined. The bank receives a master LC from an unknown issuing bank, no credit line request, contracts that do not match, and a trader with no audited accounts. Each of these is fixable, but they have to be fixed before the application, not during it. Banks rarely revisit a back-to-back request they have already declined.
For the issuing bank, the main risk is non-payment under the master LC after it has already paid the supplier. It controls this with the credit line or margin, by accepting only strong master LC banks, and by insisting on availability at its own counters so it controls presentation.
For the trader, the main risk is a mismatch. If the supplier presents compliant documents under the back-to-back LC but those documents do not comply with the master LC, the trader's bank pays the supplier and the trader is left owing the bank. Careful drafting and a pre-issuance document review are the controls.
Timing risk sits in the substitution window. Delays in supplier presentation, document examination or courier transit can push the master LC presentation past its deadline.
Performance and quality risk remains, because banks deal in documents, not goods. If the cargo is defective but the documents comply, both credits pay. Independent inspection certificates in both credits reduce this.
Amendment risk appears when the end buyer amends the master LC. Every amendment needs a matching review of the back-to-back LC, and the supplier must accept any change to its credit.
Banks price back-to-back LCs as a combination of fees on both credits. Expect an issuance commission on the back-to-back LC, usually charged as a percentage of the amount for each period it is outstanding, advising and possibly confirmation fees on the master LC, document examination fees on both presentations, amendment fees, SWIFT and courier costs, and financing interest if the back-to-back LC pays earlier than the master LC.
Pricing depends heavily on the trader's credit standing, the country risk of the master LC issuing bank, tenor and the amount of cash margin provided. A trader with a strong track record and an established trade line pays materially less than a first-time applicant relying on margin. The most reliable way to reduce the cost is to present the bank with a clean, well-documented transaction from the start.
Search interest in back-to-back LCs attracts a large number of fraudulent offers. Be very cautious of anyone offering to issue a back-to-back LC for an upfront fee without reviewing your master LC, contracts or company, offering to provide a master LC from a "provider" or "leased" bank instrument so you can open a back-to-back LC against it, or claiming a back-to-back LC can be monetised for cash without an underlying trade.
A genuine back-to-back LC is issued by a regulated bank, for the bank's own customer, against a real master LC and a real trade. It cannot be bought or leased, and no legitimate bank issues one against an instrument the applicant does not own. If an offer skips credit underwriting and KYC, treat it as a scam.
Financely is a trade finance advisory and arranging firm. We do not issue letters of credit. We help trading companies get back-to-back LC facilities approved by banks that provide them, and we structure the transaction so the bank can say yes.
Deal assessment. We review the master LC or draft, both contracts, the trading company, the counterparties and the trade corridor, and tell you whether a back-to-back LC is the right structure or whether a transferable LC or transactional facility would be faster and cheaper.
Structuring and drafting. We prepare the field-by-field matching between the two credits, the substitution timeline, document requirements and additional conditions, and flag terms in the master LC that should be amended before the buyer's bank issues it.
Credit package. We build the credit file banks need, including company profile, trade history, financials, KYC, contracts, logistics plan and transaction cash flow, so the application arrives complete.
Bank placement. We approach banks and trade finance lenders with appetite for the commodity, corridor and ticket size, drawn from our network of more than 12,700 verified lenders, and manage the process through approval and issuance.
The context matters. The Asian Development Bank estimated the global trade finance gap at about USD 2.5 trillion in its 2025 survey of more than 110 trade finance providers (ADB, Global Trade Finance Gap Survey, 2025). Many trades that could be financed are not, because the application reaches the wrong bank in the wrong form. Our work is to close that gap for the deals we take on.
Send us your master LC or draft, the sale and purchase contracts and your company details. We will assess the transaction and issue an estimate covering scope, fee and timeline for structuring and placing the facility.
If the buyer has not issued the master LC yet, contact us before they do. Most back-to-back problems start with master LC terms that are easier to fix before issuance than to amend afterwards.
A transferable LC is a single credit that the first beneficiary transfers in part to a second beneficiary under UCP 600 Article 38, which requires the buyer to issue it as transferable. A back-to-back LC is a second, independent credit issued by the trader's bank using the master LC as security. Back-to-back gives more flexibility on terms but requires the bank to take credit risk on the trader.
Each credit in the structure is normally issued subject to UCP 600, but UCP 600 has no specific article on back-to-back credits. Transferable credits are covered by Article 38. Document examination follows ISBP 821.
Rarely. Banks usually require either an approved trade credit line or a cash margin in addition to the master LC. Established traders with strong track records can get facilities with reduced or no cash margin, but first-time applicants should expect to provide some security.
With an existing banking relationship and trade line, issuance can take a few days once the master LC is received. A new facility with a new bank takes longer because of onboarding, KYC and credit approval. Preparing the credit package in advance shortens this considerably.
Yes, but any gap must be financed. If the supplier is paid at sight and the master LC pays at 90 days, the trader's bank is funding the trade for that period and will price and underwrite accordingly.
Not necessarily. Back-to-back LCs are often used to keep the supplier and end buyer apart. That requires the master LC to accept third-party documents and careful handling of the bill of lading and other documents that name the parties.
No. A legitimate master LC is issued by the real buyer's bank for a real purchase. Offers to provide, lease or rent a master LC or other bank instrument so you can open a back-to-back LC are scams.
No. Financely is an advisory and arranging firm, not a bank. We structure the transaction, prepare the credit package and place the facility with banks and trade finance lenders that issue back-to-back LCs.
This article is for general information only and does not constitute legal, tax or investment advice. Financely is an advisory and arranging firm, not a bank, lender or broker-dealer, and does not issue letters of credit or other bank instruments. Any facility is subject to bank underwriting, KYC, due diligence, credit approval, documentation and conditions precedent. No financing outcome, amount or timeline is guaranteed.
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