Letters of Credit | How a Bank Helps Two Distant Businesses Trust a Transaction

What is a letter of credit?

A commercial letter of credit is a bank’s independent undertaking to honour a complying presentation under the credit’s terms. In a typical goods transaction, the buyer arranges issuance, the seller ships and presents the stipulated documents, and payment follows the agreed documentary and payment conditions. The seller is relying on the issuing bank’s undertaking, not merely the buyer’s promise to send money later.

That final qualification is essential: the bank deals with a documentary presentation, not a guarantee that every physical or commercial aspect of the goods is satisfactory. The US International Trade Administration explains the basic allocation of buyer, seller and bank responsibilities in its Trade Finance Guide. ICC’s documentary-credit guide explains the separate roles and the autonomy of the credit.

Read the mechanism in three parallel streams: goods travel through logistics; documents travel through examination; money travels through payment and reimbursement. Confusion begins when one stream is mistaken for proof that the other two have completed.

Why ordinary trust becomes difficult across distance

A familiar domestic customer may have a payment history, a local reputation and assets a seller understands. A new foreign buyer can be harder to assess. The seller may have limited credit information, unfamiliar legal remedies and little bargaining power after the goods leave its control. The buyer faces the mirror problem: paying first exposes it to the seller’s failure to deliver.

Neither party needs to be dishonest for this tension to exist. They can both be competent and trustworthy while each lacks enough evidence about the other. The financing problem is therefore partly a problem of information and sequencing.

The letter of credit changes who supplies the payment assurance. A bank whose creditworthiness the seller is willing to accept inserts an undertaking into the transaction. The commercial relationship remains between buyer and seller; the payment promise acquires an additional institutional owner. The International Trade Administration’s introduction to letters of credit describes this use when dependable information about the foreign buyer is difficult to obtain.

Who does what?

Participant	Role in the transaction	Important boundary
Applicant	Usually the buyer requesting the credit.	Must meet its separate obligations to the issuing bank.
Beneficiary	Usually the seller entitled to present under the credit.	Must meet the presentation conditions to obtain the credit’s protection.
Issuing bank	Issues the conditional payment undertaking.	Assumes an obligation distinct from the buyer’s commercial contract.
Advising bank	Communicates the credit and checks its apparent authenticity in its advising role.	Advising alone does not add a payment undertaking.
Confirming bank	Adds its own undertaking when confirmation is arranged.	Confirmation is an additional commitment, not a synonym for notification.
Nominated bank	The bank with which the credit is available.	Nomination alone should not be mistaken for an unconditional promise to finance.

These distinctions follow the roles explained by ICC Academy. One bank can perform more than one role. The practical question is always which undertaking it has actually accepted, not how many bank names appear on the paperwork.

The sales contract and the credit are separate instruments

The sales contract describes the commercial exchange: goods, quantity, quality, price, delivery arrangements and remedies. The credit describes a separate route to payment. Its conditions determine what must be presented, where, by when and on what payment terms.

This separation makes documentary credit useful. A bank does not normally have to resolve a full commercial lawsuit before honouring a complying presentation. At the same time, the buyer cannot assume that dissatisfaction with the goods automatically cancels the bank’s undertaking.

Mandatory law still matters. Fraud, sanctions and court orders can raise legal questions that documentary rules do not erase. Independence is not permission for wrongdoing; it is a boundary between the bank’s documentary undertaking and the underlying commercial dispute. For a practical overview of that allocation, see the Trade Finance Guide.

The three streams must be designed together

The goods stream begins with production and ends with delivery, installation or resale. The document stream records selected events in that journey. The money stream may begin before shipment through working-capital borrowing and end long after delivery when the importer repays its bank.

A useful design checks whether the streams can meet without demanding the impossible. Suppose the credit requires a certificate signed by the buyer after the equipment is installed, but the seller needs payment before surrendering the shipment documents. The parties may have built a circular dependency: one step cannot happen until another step happens, while the second depends on the first.

This is an original design test rather than a special banking rule. Draw the sequence on paper. At every step, ask who controls the next required action and whether the beneficiary can realistically obtain the evidence before the deadline.

Before issuance, the bank assesses its customer

The issuing bank is not merely selling stationery. If the presentation complies, its undertaking may require payment even when its customer has become financially weak. It therefore assesses the applicant’s capacity to reimburse it, the transaction, available limits and the security or cash cover required under the facility.

The buyer may fund the credit with cash collateral, use an approved trade facility or arrange another permitted structure. Those arrangements change the bank’s reimbursement risk; they do not redefine the seller’s goods obligations. The International Trade Administration explains that the importer establishes credit with its bank and pays for the service in the Trade Finance Guide.

This connects to credit underwriting. The question remains familiar: which cash flow or collateral supports the bank if its contingent obligation turns into an actual payment?

What a presentation is supposed to establish

A credit may require a commercial invoice, an appropriate transport document, an insurance document and other specified certificates. The precise set should follow the transaction rather than a habit of asking for every document imaginable.

Each document answers a different question. An invoice records the seller’s charge. A transport document records specified carriage information. An inspection certificate reports what the named inspector examined within the certificate’s scope. None should be read as a universal statement that all goods, rights, values and legal permissions are correct.

The Trade Finance Guide describes the documentary process. The reasoning consequence is straightforward: adding a document is useful only if it addresses a real uncertainty and can be obtained reliably. Additional paperwork can otherwise create delay without creating additional protection.

The rulebook must actually apply to the credit

UCP 600 is ICC’s widely used framework for documentary credits that are made subject to it. It is not a worldwide statute automatically attached to every instrument bearing the words “letter of credit.” The credit’s wording, incorporated rules and applicable law must be read together.

Do not mix a commercial documentary credit with a standby instrument merely because both contain the same two words. ICC’s comparison of UCP 600 and ISP98 explains that different rules can be appropriate to different undertakings. Commercial credits commonly provide the ordinary payment route; standby credits typically support a fallback payment route.

For the reader, the important habit is to identify the instrument before applying the rule. A familiar product name is the beginning of analysis, not its conclusion.

Four clocks operate at once

A trade transaction can contain a shipment deadline, a presentation deadline, an expiry date and a payment maturity. They serve different purposes. Shipment tells the seller when the goods must move. Presentation tells it when documents must reach the proper place. Expiry limits availability for presentation. Payment maturity determines when money becomes due under the undertaking.

Under UCP 600, the relevant examining banks have a maximum of five banking days following presentation to determine compliance; this is not a promise that every seller receives cash exactly five days after shipping. ICC’s UCP 600 and ISP98 overview discusses examination periods.

A presentation can therefore be timely while payment falls later under a deferred-payment credit. Equally, goods can arrive promptly while documents miss an applicable deadline. The commercial calendar and the banking calendar have to be coordinated deliberately.

Sight payment is not the same as deferred payment

A sight credit provides for payment following a complying presentation and the relevant examination and processing. A deferred-payment credit provides for payment at an agreed future maturity. Acceptance and negotiation introduce other structures that must be understood from the credit.

The distinction changes working capital. A seller receiving payment at a later maturity may need financing even after its documentary risk has been reduced. A bank may agree to purchase or discount an eligible receivable or undertaking, but that is a financing decision with its own terms, costs and possible recourse.

The Trade Finance Guide separates payment availability and financing. The economic lesson is that confidence about eventual payment is not identical to cash available today. That is the same timing issue developed in Working-Capital Finance.

Confirmation changes whose credit risk the seller accepts

A seller may be comfortable with its own banking relationships but uncertain about the issuing bank or conditions in the issuing bank’s country. Confirmation can add another bank’s undertaking to the credit when that bank agrees to provide it.

This does not make the transaction risk-free. The confirming bank has to be acceptable, the presentation still has to comply, and legal or operational complications can remain. But the seller is no longer relying solely on the issuing bank’s promise. The International Trade Administration explains confirmation as an additional payment assurance.

In a fictional comparison, two credits can have identical document requirements and amounts while one is confirmed by an acceptable second bank and the other is merely advised. Their outward paperwork can look similar. Their payment-risk allocation is not.

What a discrepancy changes

A discrepancy is a failure of the presentation to meet the applicable documentary conditions. It need not mean the seller is dishonest or the goods are defective. A genuine shipment can be supported by documents that contain an unacceptable inconsistency or arrive outside the permitted period.

The bank’s undertaking is conditional, so discrepancies can interrupt the expected payment route. Correction may be possible while time remains. The issuing bank may seek the applicant’s waiver where appropriate, but the seller should not treat a hoped-for waiver as equivalent to an originally complying presentation.

The Trade Finance Guide stresses careful preparation and avoidance of discrepancies. The practical insight is that documentary competence forms part of the seller’s ability to get paid. It is not an administrative task unrelated to the commercial bargain.

A worked transaction: the equipment, the documents and the payment

Consider a fictional US$400,000 equipment purchase. The buyer and seller agree to a documentary credit available by sight payment. The importer’s bank approves issuance within its customer’s trade facility. The exporter receives the advised credit and checks whether its shipment plan and available documents can satisfy the terms.

The exporter manufactures and ships the equipment. It obtains the stipulated transport and other documents, prepares the invoice and presents the required set through the agreed banking route. The relevant bank examines the presentation. Assume, for this example, that it complies and no separate legal restriction prevents payment.

The exporter receives the US$400,000 through the payment arrangements. The issuing bank obtains reimbursement from the importer under their separate agreement. The importer uses the relevant documents and arrangements to obtain the equipment and puts it into operation.

Four outcomes now need to be distinguished. The exporter has been paid. The documentary undertaking has been performed. The equipment has been delivered. The importer’s business still has to earn enough to cover the purchase and any bank borrowing. Successful documentary payment does not prove the investment was profitable.

Change one assumption and the risk moves

Now change only the payment maturity to ninety days. The seller has greater certainty about a defined future payment if the presentation complies, but it may still need to finance wages and materials during the interval. The credit has improved credit risk without eliminating the cash gap.

Change another assumption: the buyer becomes insolvent after a complying presentation. That does not, by itself, remove the issuing bank’s independent obligation. The bank’s reimbursement problem can become a credit loss even while the exporter’s payment route performs as intended.

Change a third assumption: the equipment is commercially disappointing although the documents comply. The buyer’s remedy may sit under the sales contract rather than in an automatic instruction to stop the credit. These counterexamples follow from the independent documentary structure described in the Trade Finance Guide; they show why one instrument cannot promise every outcome.

A document can be authentic without proving everything in it

It is helpful to separate three questions. Was the document issued by the stated party? Does it comply with the presentation requirements? How much does it establish about the physical goods and the commercial transaction? Those questions overlap, but they are not interchangeable.

A certificate may be authentic but limited to a sample or an observation at one point in time. A transport record may establish carriage information without proving that the goods will perform after installation. A coherent set of documents may still need risk-based authenticity checks outside the narrow documentary comparison.

ICC’s International Maritime Bureau explains why independent authentication matters in its trade-document due-diligence guidance. The bank must respect its documentary undertaking while operating separate fraud, credit and legal controls. “Documents, not goods” is a description of the undertaking, not an instruction to ignore evidence of deception.

Cost buys a particular allocation of risk

A credit can involve issuance, advising, confirmation, amendment, examination, financing and other agreed charges. Not every transaction uses every service. Confirmation and financing are economically distinct from simply communicating a credit.

The correct comparison is therefore broader than the cheapest fee. One arrangement may leave more buyer-credit risk with the seller. Another may require the buyer to provide cash cover. A third may improve the seller’s payment assurance while increasing the importer’s financing cost. The Trade Finance Guide compares payment methods and their risk trade-offs.

For a fictional small transaction, elaborate documentation might cost more than the uncertainty it removes. For a large first shipment, the same controls might make the sale possible at all. The instrument should be judged against the transaction it enables, not against an imaginary world in which trust is free.

Digital documents change the medium, not the central question

ICC’s eUCP Version 2.1 supplements UCP 600 for electronic presentations within its scope. Electronic handling can reduce physical transit and permit more structured data exchange. It does not make all platforms interoperable or every electronic record legally equivalent in every country.

The deeper distinction is between sending a copy and transferring control of a legally effective record. UNCITRAL’s Model Law on Electronic Transferable Records addresses identification, integrity and control. National enactment and the transaction’s legal setting still have to be checked.

The reasoning test remains the same: who issued the evidence, who controls it now, what obligation does it support, and what physical or financial event will validate the claim? Faster messages are valuable only when those relationships remain intact.

What should the reader be able to explain?

Does an advising bank guarantee payment? Not merely by advising. A separate undertaking, such as confirmation, changes that answer. Does a complying presentation guarantee good equipment? No. Documentary compliance and commercial performance answer different questions. Does a deferred-payment credit give the seller cash immediately? Not without an applicable payment or financing arrangement. Does the buyer’s ordinary dispute automatically cancel the credit? No; the independence of the undertaking matters, subject to applicable law.

The useful mastery exercise is to take the fictional US$400,000 shipment and explain the position of each participant before shipment, after presentation, after bank payment and after buyer repayment. At each point, identify who owns the goods or delivery rights, who owes money, which document matters and what uncertainty remains. The source framework for these distinctions is the Trade Finance Guide and the ICC materials cited above.

The promise must eventually return to real commerce

The letter of credit does something powerful but bounded. It lets businesses proceed when direct reliance on each other is insufficient. It converts a distant payment promise into an institutional undertaking with documentary conditions and an identifiable route to performance.

Yet the final economic return lies beyond the documents. Equipment must work. Inventory must sell. The importer must repay. The bank must recognise loss if the reimbursement source fails. A credit can perform perfectly while one participant makes a poor commercial decision; that is not a contradiction. It shows why the banking instrument and the business outcome must be evaluated separately.

A letter of credit does not abolish the distance between two businesses. It builds a payment arrangement precise enough for them to cross it.

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Continue through the banking system

Return to How Banking Works for the complete bank mechanism. Follow the timing problem through Working-Capital Finance, the contractual price through Banking Fees, and the distinction between instruction and final payment through Clearing Versus Settlement.

Evidence and edition note · 5 September 2026. Sources checked for this edition include the International Trade Administration’s Trade Finance Guide, ICC Academy’s documentary-credit explanations, ICC’s eUCP publication, the International Maritime Bureau’s due-diligence guidance and UNCITRAL’s electronic-records framework. This article explains a mainstream commercial documentary credit, not every standby or specialised structure. Instrument wording, incorporated rules, mandatory law, credit approval and transaction facts control actual outcomes. It is educational, not legal advice or a recommendation of a bank or financial product.