When you're selling to a new overseas customer, or buying from a new overseas supplier, the basic problem is trust: the buyer doesn't want to pay until the goods show up, and the seller doesn't want to ship until they've been paid. A letter of credit is one of the oldest tools in international trade for solving that standoff. It doesn't eliminate risk entirely, but it shifts it in a specific, well-understood way that both sides can plan around.
What a Letter of Credit Actually Is
A letter of credit (often called an LC or documentary credit) is a written commitment from the buyer's bank, promising to pay the seller a specific amount, as long as the seller presents documents proving they shipped the goods exactly as agreed. It replaces trust in the buyer's promise to pay with trust in a bank's promise to pay, which is a much stronger position for a seller dealing with an unfamiliar overseas counterparty.
Who's Involved
A typical letter of credit has four parties: the applicant (the buyer, who requests the LC from their bank), the issuing bank (the buyer's bank, which makes the payment commitment), the beneficiary (the seller, who gets paid), and usually an advising or confirming bank on the seller's side, which notifies the seller of the LC's terms and may add its own payment guarantee on top of the issuing bank's. That confirming bank matters most when the seller doesn't fully trust the issuing bank's country or financial stability.
How the Process Works
The buyer and seller agree on terms and the buyer applies to their bank for a letter of credit naming the seller as beneficiary. The issuing bank sends the LC to the seller's bank, which notifies the seller. The seller ships the goods and gathers the required documents — typically a bill of lading, commercial invoice, packing list, and sometimes an inspection certificate or certificate of origin. The seller presents those documents to their bank, which forwards them to the issuing bank. If the documents match the LC's terms exactly, the issuing bank releases payment. That last part is important: payment is triggered by paperwork matching the agreed terms, not by an independent check that the goods themselves are correct.
Why Document Accuracy Is Everything
Banks pay against documents, not against goods. If a bill of lading has the wrong date, a quantity doesn't match exactly, or a required certificate is missing, the bank can refuse payment on a technicality even though the actual shipment was fine. This is the single most common reason letters of credit fail to pay out smoothly, and it's why exporters who use LCs regularly often have a trade finance specialist or freight forwarder double-check every document against the LC's exact wording before submission.
Types of Letters of Credit
An irrevocable LC can't be changed or canceled without everyone's agreement, which is the standard and what most sellers should insist on. A confirmed LC adds a second bank's payment guarantee, useful when the seller doesn't trust the issuing bank's country risk. A revolving LC covers a series of repeated shipments under one agreement rather than requiring a new LC each time, useful for an ongoing supplier relationship. A standby LC works more like a guarantee that only gets used if the buyer fails to pay through normal channels, similar in spirit to a performance bond.
What It Costs
Letters of credit aren't free. The buyer's bank charges a fee to issue the LC, typically a percentage of the transaction value, and there may be additional fees for confirmation, amendments, or document handling on both sides. For a smaller transaction, those fees can be a meaningful percentage of the deal, so LCs tend to make the most financial sense for larger shipments or new relationships where the cost of the guarantee is worth it relative to the risk being managed.
When a Letter of Credit Makes Sense
LCs are most useful when you're dealing with a new trading partner you don't have a payment track record with, when you're shipping to a country with higher political or currency risk, when the transaction value is large enough that the fee is worth it, or when a bank or investor is requiring documented, secured payment terms as a condition of financing the deal. For long-standing relationships with a reliable payment history, many businesses eventually move to open account terms or other less expensive arrangements once trust is established.
Practical Steps for a Small Business
If you're new to letters of credit: work with your bank's trade finance department early, before you finalize terms with your counterparty, so you understand what they'll require. Draft the LC terms to match exactly what you can actually produce and ship — overly specific or unrealistic terms are a common cause of document mismatches. Consider a confirmed LC if you have any doubt about the issuing bank's reliability. And build extra time into your shipping schedule for document preparation and review, since a rushed shipment is where LC document errors tend to happen.
A letter of credit won't make an international deal risk-free, but it converts an open-ended trust problem into a well-defined paperwork problem — and paperwork, unlike trust, is something you can actually control.
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