A letter of credit is a written promise from a bank that a seller will get paid once the seller ships the goods and presents documents matching the terms the bank set out. That is the core of how letters of credit work: the buyer’s bank puts its own money on the line so the seller doesn’t have to trust a stranger in another country, and payment turns entirely on paperwork rather than on the goods themselves.
Banks issue billions of dollars in these instruments every year, and they remain the backbone of international trade because they follow a strict, predictable set of rules about documents, deadlines, and which party carries the risk at each stage.
The Four Parties in a Letter of Credit
You cannot follow the mechanics without knowing who is doing what. Every letter of credit has at least four participants.
The applicant is the buyer. You go to your bank, fill out an application, and ask it to issue a credit in favor of your seller. Your bank then becomes the issuing bank and takes on the primary obligation to pay. The beneficiary is the seller, who ships the goods and collects payment by presenting documents that match the credit’s terms.
The issuing bank usually routes the credit through an advising bank in the seller’s country. The advising bank verifies that the credit is authentic and passes it on to the beneficiary. In higher-risk situations, the seller may also demand a confirming bank, which adds its own independent payment guarantee on top of the issuing bank’s. If the issuing bank or its home country runs into trouble, the seller still has a solvent bank standing behind the promise.
The Documents-Only Principle
The single most important thing to understand about letters of credit: banks deal in documents, not in goods. If the paperwork complies with the credit, the bank pays, regardless of what is actually sitting in the container. Under U.S. law, the rights and obligations between the issuing bank and the beneficiary are independent of the underlying sales contract between buyer and seller.1Legal Information Institute. UCC 5-108 Issuers Rights and Obligations
That independence is what makes the instrument reliable. It is also what surprises buyers who assumed the bank would somehow verify quality or delivery.
Most commercial letters of credit worldwide operate under the Uniform Customs and Practice for Documentary Credits (UCP 600), a rulebook published by the International Chamber of Commerce. UCP 600 sets how banks examine documents, how long they have to accept or refuse them, and what happens when something goes wrong. Every credit under these rules is irrevocable by default, so no party can amend or cancel it without everyone’s consent.2ICC Academy. Documentary Credits: Rules, Guidelines and Terminology In the United States, Article 5 of the Uniform Commercial Code provides the domestic legal framework alongside UCP 600.
How a Transaction Moves From Application to Payment
The process runs in a predictable sequence, and each step has its own points where things can slow down.
Applying for the Credit
The application requires precision. A vague description or mismatched date can trigger a discrepancy later that delays payment for weeks. When you apply, your bank needs the exact dollar amount, a firm expiration date, and the place where documents must be presented, which is usually the advising bank’s location. You also specify a latest shipment date that realistically matches your supplier’s production schedule.
The credit must list every document the seller has to present. The most common are a bill of lading (proof the goods went to the carrier), a commercial invoice (the seller’s itemized bill), and a certificate of origin (confirming where the goods were made). Credits often also call for insurance certificates, packing lists, or inspection certificates. Every extra document is another chance for something to go wrong at examination.
Issuance and Advising
Once the issuing bank approves the application, it transmits the credit electronically to the advising bank in the seller’s country. The advising bank verifies the credit’s authenticity and notifies the seller that it is available. At this point the seller should read every line and flag anything they cannot realistically deliver, such as a certificate from an agency that does not operate in the shipment’s origin country. Getting an amendment before shipping is far cheaper than negotiating discrepancies after the goods are on the water.
Shipment and Presentation
The seller ships the goods, gathers the required documents, and presents them to the advising or confirming bank. This is where the real scrutiny happens. Bank examiners review every line of every document against the credit’s terms. Under UCP 600, data across different documents does not have to match word for word, but it cannot conflict. A misspelled company name, a weight that does not match the packing list, or an invoice amount a few dollars over the credit can all trigger a refusal.
One deadline catches many sellers off guard. If the credit does not specify how quickly after shipment the beneficiary must present documents, UCP 600 defaults to 21 calendar days from the shipment date.3ICC. Guidance Papers on Recommended Principles and Usages around UCP 600 Rules Miss that window and the presentation is late even if the credit itself has not expired.
Payment and Handover
If the documents comply, the bank releases payment to the seller. The issuing bank then debits the buyer’s account or draws on the buyer’s line of credit and forwards the original shipping documents. The buyer needs those originals, particularly the bill of lading, to claim the goods from the carrier at the destination port. The International Trade Administration describes the system as one that protects both sides: the exporter gets a payment guarantee, and the importer gets reasonable assurance the goods were actually shipped.4International Trade Administration. Letter of Credit
Commercial Credits Versus Standby Credits
The two most common forms behave in opposite ways. A commercial letter of credit is the workhorse of international trade. It is the primary payment method: the seller ships, presents documents, and the bank pays. Everyone expects it to be drawn on.
A standby letter of credit sits in the background as a safety net and only pays out if the applicant fails to perform under the underlying contract.5ICC Academy. Comprehensive Guide to Standby Letters of Credit Standbys are common in construction, real estate, and service contracts where the guarantee backs a performance obligation rather than a shipment of goods. Commercial credits typically expire within six months, while standbys can run for years.
Beyond these two, revolving credits automatically replenish after each drawing (useful for repeat shipments on a schedule), back-to-back credits let a middleman use the buyer’s credit as collateral to open a second credit for the actual supplier, and red clause credits allow the seller to draw an advance before shipping. Standby credits often operate under a separate ICC rulebook called the International Standby Practices (ISP98).
When Documents Don’t Match
Discrepancies are the biggest source of friction in these transactions. Industry estimates suggest 60% to 80% of first presentations contain at least one error. Most are minor: a date off by a day, a port name abbreviated differently, or a missing signature. Minor or not, the bank has to flag it.
When a bank finds discrepancies, the clock starts. Under UCP 600, the examining bank has a maximum of five banking days from the day it receives the documents to decide whether to accept or refuse them.2ICC Academy. Documentary Credits: Rules, Guidelines and Terminology If the bank refuses, it must send a single notice listing every discrepancy it found. A bank that misses that deadline loses the right to claim non-compliance and becomes obligated to pay.
In practice, when discrepancies surface, the issuing bank often contacts the buyer to ask whether they will waive the problems. If you are the buyer and the errors are trivial, accepting a waiver keeps the deal moving. The issuing bank is not bound by your decision and can still refuse the documents on its own concerns. If the bank does accept the waiver, though, it must honor the credit despite the defects.
What a Letter of Credit Doesn’t Protect Against
The same independence principle that makes the instrument reliable also creates a blind spot. Because banks examine documents rather than cargo, a letter of credit does not guarantee the buyer will receive goods that match the sales contract. If the seller ships lower-quality materials but presents documents that perfectly describe what the credit requires, the bank pays. The buyer’s recourse is against the seller under the sales contract, not against the bank.
The main exception is outright fraud. Under UCC Article 5, a court can issue an injunction stopping payment if the documents are forged or materially fraudulent and the beneficiary participated in the fraud. Courts set a high bar for this, and a dispute about product quality or late delivery almost never qualifies. If you are a buyer worried about what is actually inside the containers, the better protection is to require an independent inspection certificate as one of the credit’s required documents, issued by a third-party surveyor at the loading port.
Costs and Collateral
Letters of credit are not cheap. The International Trade Administration describes them as “labor-intensive and relatively expensive.”4International Trade Administration. Letter of Credit Buyers typically pay an issuance fee calculated as a percentage of the credit amount, commonly in the range of 0.75% to 1.5%, though rates vary with the applicant’s creditworthiness, the issuing bank’s risk assessment, and the countries involved. If a confirming bank adds its guarantee, it charges a separate confirmation fee, which can match or exceed the issuance fee for higher-risk jurisdictions.
Sellers face their own costs: advising fees, document examination fees, and amendment fees if the credit needs to be changed after issuance. Each presentation that gets examined generates a fee, which is one reason standby credits tend to be cheaper overall, since they rarely get drawn on.5ICC Academy. Comprehensive Guide to Standby Letters of Credit
Banks also require collateral. Many issuing banks extend the credit against the buyer’s existing line of credit or other banking relationship. Applicants without an established credit history may need to deposit the full face value of the credit as cash collateral before the bank will issue it. For smaller businesses, this can tie up significant working capital, so negotiate the terms before committing to a letter of credit as your payment method.
When a Letter of Credit Makes Sense
Not every transaction needs one. Letters of credit earn their cost when you are dealing with a new trading partner whose creditworthiness you cannot easily verify, when the transaction is large enough to justify the fees, or when the buyer’s country carries political or economic risk that makes other payment methods unreliable. They are standard in industries like commodities, heavy equipment, and raw materials where shipment values routinely reach six or seven figures.
For smaller, repeat transactions with trusted partners, the paperwork and cost overhead may not pay off. Open account terms, documentary collections, or trade credit insurance can handle lower-risk deals for far less. The right choice depends on how well you know the other party, how much money is at stake, and how much of the risk you are willing to carry yourself.