A Letter of Credit (LC) is a financial instrument often used in international trade transactions. It serves as a guarantee from a bank or financial institution to pay the seller on behalf of the buyer. LCs provide assurance to both parties, ensuring that the seller receives payment for goods or services, and the buyer receives the agreed-upon merchandise. This mechanism facilitates secure and smooth trade transactions, particularly in cross-border commerce.
In technical terms, a documentary letter of credit is an irrevocable undertaking of the issuing bank. Once the credit is issued it cannot be amended or cancelled without the agreement of the issuing bank, the beneficiary and, where applicable, the confirming bank. The undertaking is definite: if the beneficiary presents documents that comply with the terms of the credit, the issuing bank must honour, whatever the state of the commercial relationship between buyer and seller.
Payment is made against complying documents, not against goods. The bank never inspects the cargo, the factory, or the quality of what was shipped. It examines paper. If the documents presented match the credit on their face, payment follows. If they do not, payment can be refused even where the goods themselves are perfect. This is the single most important thing an importer or exporter has to internalise before using a letter of credit.
That separation is called the principle of autonomy: banks deal in documents, not in the underlying contract. A dispute over late delivery, price, or product specification is a matter between buyer and seller under the sales contract. It does not entitle the applicant to instruct the bank not to pay a complying presentation, and it does not give the bank a defence against the beneficiary.
The framework is set by the ICC. UCP 600 (Uniform Customs and Practice for Documentary Credits) contains the rules the parties incorporate into the credit. ISBP 821 (International Standard Banking Practice) explains how document checkers apply those rules in practice — how names, dates, descriptions, corrections and originals are treated. Read together they are what makes a credit issued in one jurisdiction usable in another.
Six roles appear in almost every documentary credit. The applicant is the buyer, who asks for the credit to be opened and is ultimately liable for reimbursement. The beneficiary is the seller, who ships the goods and presents the documents. The issuing bank opens the credit and carries the payment undertaking. The advising bank, usually in the beneficiary's country, authenticates the credit and passes it on without adding its own obligation. The confirming bank adds its own irrevocable undertaking alongside the issuing bank's, so the beneficiary is no longer exposed to the issuing bank or its country. The nominated bank is the bank authorised in the credit to receive the presentation and to honour or negotiate.
Understanding who does what matters commercially, because each role carries a fee and each role changes who bears which risk. A credit that is advised but not confirmed leaves the seller with the issuing bank's risk. A credit available at the counters of a nominated bank in the seller's country pays faster than one available only at the issuing bank's counters abroad.