What Is a Letter of Credit and How Does It Work

A letter of credit is a document issued by a bank that promises to pay a specific amount of money on behalf of a customer, under certain conditions. It functions as a financial guarantee between a buyer and a seller, typically used in international trade and large business transactions. When a buyer cannot pay a seller directly, the buyer's bank steps in and promises payment, provided the seller meets agreed-upon requirements.

Learn About Credit Cards Costco Accepts Today →

The basic mechanism involves four parties: the buyer (called the applicant), the buyer's bank (the issuing bank), the seller (called the beneficiary), and often the seller's bank (the advising or confirming bank). The buyer requests their bank to issue a letter of credit in favor of the seller. This document outlines specific conditions that must be met before payment occurs, such as delivery of goods, presentation of shipping documents, or completion of services.

Letters of credit are particularly common in international trade. According to the International Chamber of Commerce, letters of credit remain one of the most important trade finance tools worldwide, with estimates suggesting trillions of dollars in trade annually involve these instruments. They reduce risk for both parties because neither the buyer nor the seller must trust each other directly—they trust the bank instead.

The payment process works in steps. First, the buyer and seller agree on transaction terms and the buyer requests a letter of credit from their bank. The issuing bank then sends the letter to the seller (often through an intermediary bank). When the seller fulfills the conditions—such as shipping goods and providing required documents—the seller presents these documents to the bank. The bank reviews the documents, and if everything matches the letter's requirements, the bank releases payment to the seller.

Practical takeaway: A letter of credit reduces risk in transactions by replacing direct trust between buyer and seller with a bank's promise to pay, making it valuable for deals involving significant money, international shipping, or unfamiliar trading partners.

Types of Letters of Credit and Their Uses

Several variations of letters of credit exist, each designed for different business situations. Understanding these types helps explain why companies choose this payment method over other options. The most common types include revocable letters of credit, irrevocable letters of credit, confirmed letters of credit, and standby letters of credit.

Free Guide to VSP Vision Insurance Phone Numbers →

A revocable letter of credit can be canceled or changed by the issuing bank without notifying the seller beforehand. This type offers minimal protection to the seller and is rarely used in modern international trade. An irrevocable letter of credit, by contrast, cannot be changed or canceled without the agreement of all parties involved—the buyer, the seller, the issuing bank, and any confirming bank. This provides strong protection for the seller and is the standard in most commercial transactions.

A confirmed letter of credit includes a guarantee from a second bank (typically the seller's bank) that payment will be made if the issuing bank fails to do so. This adds an extra layer of security, particularly valuable when the issuing bank is located in a country with economic or political instability. The confirming bank essentially backs up the original promise. This added protection comes with higher fees, typically ranging from 0.5% to 2% of the letter's value.

Standby letters of credit function differently from commercial letters of credit. Rather than being the primary payment method, they serve as a backup guarantee. For example, a contractor might obtain a standby letter of credit to assure a client that if the work is not completed properly, the bank will pay compensation. Standby letters are common in construction projects, government contracts, and lease agreements. In the United States, standby letters of credit are governed by Article 5 of the Uniform Commercial Code.

Other specialized types include back-to-back letters of credit (used when a middleman must obtain financing to purchase goods before reselling them), transferable letters of credit (which allow the beneficiary to transfer rights to another party), and red clause letters of credit (which allow the seller to receive an advance before shipping goods). Each serves specific business needs and comes with distinct advantages and costs.

Practical takeaway: Choosing the right letter of credit type depends on the transaction's risk level, the parties' locations, and their relationship history. Irrevocable letters of credit are the most common choice for significant international transactions because they offer the strongest protections.

The Document Requirements and Review Process

One of the most critical aspects of letters of credit involves the specific documents the seller must provide to receive payment. Banks are strict about document requirements because the bank's obligation to pay is based on documents, not on whether goods actually arrived or whether services were properly completed. This principle, called the "independence principle," means the bank does not investigate whether the underlying transaction occurred correctly—only whether the submitted documents comply with the letter's terms.

Learn About Optum Financial Payment Cards →

Common documents required in letters of credit include the commercial invoice (showing what was sold and for what price), bills of lading (proving goods were shipped), packing lists (detailing what was included in each shipment), certificates of origin (confirming where goods were made), insurance certificates (proving goods are insured during shipment), and inspection certificates (confirming quality standards were met). For services rather than goods, the documents might include certificates of completion, progress reports, or sworn statements from authorized individuals.

The review process follows specific rules outlined in the Uniform Customs and Practice for Documentary Credits (UCP), a set of international standards maintained by the International Chamber of Commerce. Banks must review submitted documents within a set timeframe—typically five banking days. During this review, the bank checks that each document matches the requirements stated in the letter of credit exactly. This means font sizes, dates, signatures, and specific wording must correspond precisely. A discrepancy as small as a misspelled company name or a date that doesn't match can result in the bank rejecting the entire submission.

When a bank finds discrepancies, it typically notifies the seller and the buyer's bank immediately. The seller then has the option to correct and resubmit the documents, or the buyer can waive the discrepancy and authorize payment. According to data from the International Chamber of Commerce, approximately 20% to 30% of letter of credit submissions contain discrepancies on the first attempt. Common errors include incorrect dates, missing signatures, descriptions that don't match the letter's wording exactly, and incomplete insurance documentation.

Banks maintain high standards for document review because they are legally liable if they pay against documents that don't comply with the letter's terms. A bank that pays when documents don't match can be held responsible to the buyer for the payment amount. This legal liability is why banks err on the side of caution and reject documents with any deviation from requirements.

Practical takeaway: When dealing with letters of credit, prepare all required documents with extreme care and attention to detail. Work with your bank or a trade finance specialist to verify that every document meets the exact specifications in the letter of credit before submission, as even minor discrepancies can delay or prevent payment.

Costs, Fees, and Timeline Considerations

Operating a letter of credit involves several costs that both buyers and sellers should understand. These costs vary based on the letter's complexity, the amount involved, the countries participating in the transaction, and the risk level the bank perceives. Typical fees include issuance fees (paid by the buyer for the bank to create the letter), advising fees (paid by the seller's bank for reviewing and confirming the letter), confirmation fees (if a second bank adds its guarantee), amendment fees (if the letter's terms must be changed), and negotiation fees (if the bank must evaluate documents).

Free Guide to Paying Your Pandora Credit Card Bill →

Issuance fees typically range from 0.5% to 3% of the letter's value, though fees can be higher for complex transactions or when dealing with riskier countries. For example, a $100,000 letter of credit might cost the buyer $500 to $3,000 in issuance fees alone. Smaller transactions sometimes include flat fees instead of percentages. Advising fees charged to the seller usually range from $200 to $800 depending on the letter's complexity. Confirmation fees, when applicable, add another 0.5% to 2% to the total cost.

The timeline for processing a letter of credit also matters significantly. The buyer must allow time for their bank to approve the letter before it can be issued—typically three to five business days for straightforward transactions. The issuing bank then transmits the letter to the seller's bank, which may take one to three days depending on communication methods. The seller then has a specified period (often 20 to 30 days after shipment) to present documents to the bank. The bank's review process takes another five to