Learn How Letters of Credit Work in Banking

What a Letter of Credit Actually Is and Why Banks Use Them

A letter of credit is a written promise from a bank that payment will be made on behalf of one of its customers. Think of it as the bank stepping in to vouch for someone's ability to pay. When a buyer and seller don't know each other well or live in different countries, this promise reduces the risk for both sides.

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Here's a concrete scenario: A company in New Jersey wants to buy fabric from a manufacturer in India. The Indian company worries they'll send the goods but never receive payment. The New Jersey buyer worries they'll pay upfront but the fabric won't arrive or will be damaged. A letter of credit solves both problems. The buyer's bank issues a document stating that money will be paid once certain conditions are met—like proof that the fabric has actually been shipped.

Letters of credit emerged from international trade hundreds of years ago. Merchants traveling long distances needed a way to move money safely and verify transactions without carrying gold coins. The concept evolved into the modern banking tool used today. According to the International Chamber of Commerce, letters of credit still play a major role in global trade, facilitating an estimated $1 trillion in annual transactions.

The key thing to understand is that a letter of credit isn't money itself. It's a commitment. The bank promises it will pay IF specific actions happen first. This creates security through verification rather than upfront cash transfer. The seller gets confidence that payment is coming (backed by a bank, not just a customer's word). The buyer gets confidence that payment only happens when conditions are satisfied.

Takeaway: A letter of credit is a banking tool that reduces risk in transactions between parties who may not fully trust each other or who are separated by distance or unfamiliar business practices.

The Different Types of Letters of Credit and How They Work Differently

Not all letters of credit operate the same way. Different types serve different purposes, and understanding which type is being used matters because the rules and protections change.

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The most common type is a revocable letter of credit. This means the issuing bank can cancel or change the terms at any time without notifying the beneficiary (the party receiving the money). This sounds protective for the buyer, but it's risky for the seller because payment could be withdrawn unexpectedly. Because of this risk, revocable letters of credit are rarely used in modern business. A seller would prefer an irrevocable letter of credit, which cannot be changed or canceled without agreement from all parties involved. Once issued, the bank's promise stands firm.

A confirmed letter of credit adds another layer of security. When it's confirmed, a second bank (often in the beneficiary's home country) also promises to pay. This means the seller has two banks backing the payment, not just one. If the issuing bank fails or there's a dispute, the confirming bank still pays. This type is common in large international deals where the risk justifies the extra cost.

A standby letter of credit works differently from other types. It's not meant to be used in normal circumstances. Instead, it sits in the background like insurance. The beneficiary only calls on it if the buyer fails to meet their obligations. For example, a contractor might provide a standby letter of credit to a project owner, guaranteeing that if the contractor abandons the job, the bank will pay for another contractor to finish. Standby letters are also used as bid bonds (showing you're serious about a bid) or performance bonds (showing you'll complete work as promised).

A transferable letter of credit allows the first beneficiary to transfer their rights to another party. This is useful in middleman situations where a trader buys goods from one manufacturer and sells them to another retailer. The trader can transfer the letter of credit, avoiding the need to pay for goods before receiving payment from the end buyer.

Takeaway: The type of letter of credit determines who can change terms, how many banks guarantee payment, and what triggers the bank to actually pay out money. Knowing which type is being used tells you a lot about the risk level in a transaction.

How the Letter of Credit Process Actually Flows From Start to Finish

Understanding the step-by-step flow of a letter of credit helps clarify why all the paperwork and verification matters. Each step has a reason, and skipping or rushing any step can create problems.

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The process begins when a buyer and seller agree to use a letter of credit. They decide on the exact terms: the amount of money, what documents must be presented before payment is made, and when the letter expires. This agreement is often called the "commercial contract." If a buyer wants to purchase $50,000 worth of machinery, the contract might specify that the seller must present a bill of lading (proof of shipment), an invoice, and an inspection certificate before the buyer's bank will pay.

Next, the buyer (also called the applicant) goes to their bank and requests that the bank issue a letter of credit. The buyer completes an application with their bank, providing details about the transaction and agreeing to reimburse the bank once the letter is issued. The buyer's bank reviews the request to make sure the buyer has sufficient funds or credit to support this commitment. The bank may require collateral or a deposit. This step usually takes a few business days.

The buyer's bank then issues the letter of credit and sends it to the seller's bank (called the advising bank). The advising bank examines the letter to make sure it appears legitimate and complete, then notifies the seller that the letter has been received. At this point, the seller knows payment is backed by a bank and can proceed with confidence.

The seller ships the goods and collects all required documents: shipping receipts, commercial invoices, packing lists, inspection reports, and insurance documents—whatever was specified in the letter of credit terms. Importantly, the documents must match exactly what was stated in the letter. If the letter says "1,000 widgets" and the invoice says "1,000 units," this mismatch can cause the bank to refuse payment.

The seller presents all these documents to their bank (the advising or confirming bank) before the letter's expiration date. The bank examines each document carefully, comparing them against the letter of credit requirements. Banks are trained to look for discrepancies, no matter how small. If everything matches, the bank pays the seller and sends the documents to the buyer's bank.

The buyer's bank receives the documents, reviews them, and debits the buyer's account for the payment amount. The buyer then receives the documents and can use them to claim the goods from the shipping company or customs authority.

Takeaway: The letter of credit process involves multiple verification points, each designed to confirm that the transaction is proceeding as agreed before any money changes hands.

What Documents Matter and Why Banks Are So Strict About Them

One frustrating aspect of letters of credit is how particular banks are about documents. A small error—a date that doesn't match, a name spelled slightly differently, or a missing signature—can cause a bank to refuse payment. This isn't arbitrary; there's a reason for this strictness.

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Banks operate under rules called the Uniform Customs and Practice for Documentary Credits (UCP). These international rules exist because banks deal with hundreds of transactions and have no direct knowledge of whether goods were actually shipped or are of good quality. The bank cannot inspect the machinery, taste the coffee, or test the circuit boards. All the bank can do is verify that the documents submitted are exactly what was promised in the letter of credit.

Common required documents include: a commercial invoice (the seller's bill), a bill of lading (proof the goods were loaded onto a ship or plane), a packing list (details about what's in each box), a certificate of origin (proving where goods were made), insurance documents (showing the goods are insured during transit), and inspection certificates (third-party confirmation of quality or quantity). Some letters of credit require additional documents specific to the goods—like health certificates for food products or authenticity certificates for branded items.

Why does the date on the bill of lading matter so much? Because if a letter of credit expires on June 30 and the bill of lading is dated July 5, the bank cannot process it. The letter is no longer active. Similarly, if the letter specifies that the invoice must be from "Smith Trading Company" and the document is signed by "Smith Trade Co.," this discrepancy may be rejected because the bank cannot confirm these refer to the same entity.

In 2021, the International Chamber of Commerce found that approximately 70% of letter of credit submissions contained at least one