An importer opens a documentary letter of credit for 26 tonnes of white sugar. The seller presents a commercial invoice, bill of lading and packing list; the presentation complies, and the bank pays. At destination, some bags are wet and caked. The importer assumed the credit protected the purchase. It protected something narrower.
Hypothetical teaching example: the parties and shipment are fictional, not a Maqboola transaction.
Short answer: a letter of credit (LC), also called a documentary credit, is a bank's undertaking to pay the seller when the seller presents documents that comply with the credit's terms. It pays for complying documents, not for goods in the condition you ordered. The bank does not inspect the cargo, and the credit is a separate transaction from your sales contract. It gives the seller a bank's promise and the buyer a documentary condition before payment. Quality, quantity and condition are protected only as far as the documents you require can show them. ITA, Trade Finance Guide
The promise in one sentence
The US International Trade Administration (ITA) describes a letter of credit as a commitment by the importer's bank to pay the exporter, provided the stated terms and conditions are met. Its guide says the banks "deal in documents only, not goods", and are not concerned with the quality of the goods or whether each party performs the sales contract. ITA, Trade Finance Guide
The International Chamber of Commerce's (ICC) rules say the same. The Uniform Customs and Practice for Documentary Credits (UCP 600) treats a credit as separate from the sale contract (article 4). Banks deal with documents, not with the goods to which they relate (article 5), examine a presentation on the basis of the documents alone (article 14(a)), and take no responsibility for the quantity, quality or condition of the goods (article 34). ICC, UCP 600
"Pays" also needs care. Under UCP 600 article 7 the issuing bank must honour a complying presentation; depending on the credit, that means paying at sight, or incurring an obligation to pay at a later maturity. ICC, UCP 600 ICC Academy notes that commercial credits often use time tenors because they carry a financing need. ICC Academy, standby letters of credit
This article covers commercial documentary credits used to pay for goods. Standby credits and demand guarantees usually back up a different obligation; see standby letters of credit for commodity buyers.
How a letter of credit works: the process step by step
Three roles matter: the applicant (the buyer who asks for the credit), the issuing bank (which gives the undertaking) and the beneficiary (the seller entitled to present documents). Other banks may advise, check or pay. Behind them sit two separate agreements: the sales contract between buyer and seller, and the credit, which sets the bank's conditions.
The table follows the ITA's illustrative transaction and separates what moves at each stage. Goods, documents and money travel on different paths, and they never merge. ITA, Trade Finance Guide ITA, Letter of Credit
| Step | What happens | Goods | Documents | Money |
|---|---|---|---|---|
| 1 | Buyer and seller agree the sale, then the buyer applies to its bank, which assesses the buyer's credit | At seller | None yet | Bank may require cover or a facility |
| 2 | Issuing bank opens the credit; it reaches the seller through the seller's bank | At seller | Credit terms | None |
| 3 | Seller ships and prepares the documents the credit requires | In transit | Being produced | None |
| 4 | Documents are presented and checked for compliance | In transit | At the banks | None until compliance |
| 5 | Issuing bank honours: pays or commits to pay at maturity | In transit or arrived | Released to the buyer | Seller paid under the terms; buyer's account debited |
| 6 | Buyer uses the documents to claim the goods and clear customs | Collected | With the buyer | Settled |
The bank's decision sits at step 4, while the goods are at sea. Nobody at that stage opens a container. If the documents are refused, the next moves are covered in why banks refuse documents.
The rules behind the credit
Most credits are issued subject to UCP 600, the ICC's 2007 revision. ICC Academy, documentary credit rules and terminology Under its article 1, the rules apply when the credit expressly says it is subject to them, and bind the parties unless the credit expressly modifies or excludes them. ICC, UCP 600 Read the actual wording with your bank before issue.
If documents will be presented electronically, ask about the eUCP supplement, version 2.1. International Standard Banking Practice (ISBP 821, 2023) is different in kind: it explains how banks apply UCP 600 when examining documents and does not amend the rules. ICC Academy, documentary credit rules and terminology
The ITA guide adds that, unless it states otherwise, a credit is irrevocable: it cannot be changed or cancelled without the agreement of the importer, banks and exporter. ITA, Trade Finance Guide
What a credit can protect
A documentary condition before payment. The buyer can require shipment evidence before the bank pays, which is different from an unconditional advance to the supplier. It is still evidence on paper, or in an accepted electronic form, not a check of the container.
A bank undertaking for the seller. The seller can assess the issuing bank before committing. Whether it accepts depends on that bank, the country exposure and whether it can produce the documents. An LC does not compel anyone to trade. If bank or country risk is the problem, confirmation by a second bank is a separate discussion.
Room to define the evidence. HSBC's documentary-credit guidance tells buyers they can set expectations for shipping, delivery, insurance and quality inspection in the credit. HSBC, documentary credit Design that evidence around the actual purchase; how a seller should read those fields on receipt is covered in reading an LC before you accept it.
What it leaves exposed
Quality and condition. A matching invoice description is not a laboratory result or a condition survey. An authentic, complying presentation can still accompany cargo that fails the contract.
Quantity. The contract quantity, the credit amount, the unit price and any tolerance need to be read together. Do not assume one tolerance applies to all of them.
Wrong or substituted goods. Document examination is not physical verification. If grade or lot substitution is a concern, decide who inspects, what, and how the inspected lot is tied to the shipment. A longer document list does not by itself answer authenticity concerns; the bank is not responsible for the genuineness of documents (UCP 600 article 34). ICC, UCP 600
Arrival timing and transit damage. A latest shipment date is not an arrival guarantee. Voyage time, handling, cargo protection and insurance are managed outside the credit. An inspection before shipment cannot certify what happens in transit.
These are questions for the bank, the inspection provider and the contract, not automatic grounds for refusing documents or rejecting goods.
Make the inspection certificate do a defined job
The document buyers most often under-specify is the inspection certificate. A pre-shipment certificate from an agreed independent provider adds evidence about the goods at the inspection point. Its value depends on the provider, the commissioned scope, the sampling and the link between the inspected lot and the goods loaded.
Name both the issuer and the result. Under UCP 600 article 14(f), where a credit asks for such a document without saying who issues it or what it must contain, banks accept it as presented if its content appears to fulfil the function of the required document and its data do not conflict with the credit, the document itself or the other stipulated documents (article 14(d)). ICC, UCP 600 "Inspection certificate" alone may therefore secure neither the provider you trust nor a satisfactory finding. Agree with the bank and the provider:
- the lot and shipment to be identified;
- the parameters and test methods;
- who draws samples, where and when;
- who issues the report and what it must state;
- what happens if the result fails the contract.
Sampling leaves residual uncertainty. The Codex General Guidelines on Sampling (CXG 50-2004, revised 2023) describe acceptance sampling as controlling the risk of a wrong lot decision, and say both parties should understand its limitations and risks. Sampling plans and criteria vary with product and purpose. Codex, CXG 50-2004
For a breakdown of issuer, scope and evidentiary limits, see how independent inspection certificates work.
Match the concern to the evidence
A discussion aid for your bank, inspector and destination adviser, not a universal checklist or approved clause wording.
| Concern | Evidence to discuss | Who must be identified | Limit to remember |
|---|---|---|---|
| Shipment took place | Transport document with the required shipment details | Carrier or permitted signatory | Does not establish every container's contents |
| Quantity differs | Weight or quantity report linked to the lot | Agreed weighing or inspection provider | Does not establish quality or later losses |
| Grade or condition differs | Inspection or analysis report with a defined scope | Provider, laboratory, sampler | Covers the agreed tests at the inspection point only |
| Food compliance required | Documents the destination authority requires for this product | Authority or accepted issuer for each | Health, analysis and conformity documents are not interchangeable |
| Origin matters | The applicable proof of origin | Issuer or declarant allowed under the regime | A non-preferential certificate does not itself secure preferential duty |
The origin row follows the World Customs Organization's distinction between preferential and non-preferential origin. WCO, origin FAQ Where each document fits in the full shipment set is covered in the document set behind one shipment.
Cost and cash: ask for the whole commitment
The ITA describes letters of credit as labour-intensive and relatively expensive in bank fees, warns that the documents are detailed and prone to errors and discrepancies, and advises asking your bank what the credit costs and who pays the fees before applying. ITA, Letter of Credit Fee and margin practice varies by bank and country, so get a quotation for your own transaction and separate three questions:
- Fees: which issuance, amendment, examination or other charges apply, who pays them and when?
- Funding: what cash cover, security or facility usage will the bank require?
- Release: when will committed funds or limits be freed, including where payment falls after presentation?
Cash cover is not a fee. It is your money committed to the transaction, with a financing or opportunity cost. Do not assume its release date from the credit's expiry; ask the bank in writing.
When an LC is the wrong tool
Weigh the size of the exposure, the relationship, the supplier's requirements and your team's capacity to handle documents. A credit can suit a new relationship yet be disproportionate for a small or repeat order. The comparison with a bank-handled collection is set out in documentary collection or letter of credit.
If the real problem is an undefined grade or an untested supplier, fix that alongside the payment method. A smaller trial order and a suitable inspection scope answer questions a document check cannot.
Legitimate trade finance often sits around credits: HSBC describes pre-shipment finance and post-shipment finance where documents under the credit are negotiated. HSBC, how documentary credits work Offers to lease or "monetise" instruments are a different matter and need separate scrutiny with your bank.
Worked example: what an added certificate changes
Hypothetical teaching example. All parties and figures are invented, in currency units (CU). They illustrate arithmetic, not market prices, bank tariffs or typical margins.
The importer buys 26 tonnes of white sugar at 650 CU per tonne: 16,900 CU. Its bank asks for 3,380 CU of cash cover, held from issue until reimbursement, and charges 150 CU issuance, 90 CU examination and 60 CU for one amendment: 300 CU. Total outlay: 17,200 CU. The credit calls for an invoice, bill of lading and packing list. Documents comply; the seller is paid. At destination, 4 tonnes are caked: 2,600 CU of goods, about 15% of the invoice value.
Now add an inspection certificate from a named provider, stating that moisture meets the contract limit on a defined lot, sampled at the loading point. Assume the provider charges 400 CU. Charges and inspection come to 700 CU, total outlay 17,600 CU; the cash cover is unchanged at 3,380 CU.
| What actually happened | What the certificate contributes | What stays unresolved |
|---|---|---|
| Moisture was excessive before loading and sampling detected it | Evidence before dispatch; a certificate that does not state the required result, or is missing, may prevent a complying presentation | Contract remedy, any waiver and a replacement shipment still need agreement |
| Sugar was sound at inspection and got wet later | A dated record that helps show when the damage occurred | Responsibility and any insurance claim need separate evidence |
| The sample missed an affected part of the lot | A report within its sampling limits | It cannot show that every bag was sound |
In all three branches the bank acted correctly in paying against complying documents. The 400 CU bought evidence, not a guaranteed cargo outcome.
Common mistakes
- Believing the bank inspects the goods before paying.
- Listing "inspection certificate" without naming the issuer or the result it must state.
- Budgeting for fees but not for the cash cover the bank holds.
- Treating a shipment date as an arrival date.
- Opening a credit to cover for an unclear specification or an unverified supplier.
Limits and what to recheck
This is general educational information, not legal or banking advice. It summarises public ITA, ICC and bank material; the ICC Academy articles are practitioner commentary. Whether a presentation complies, and what a bank must do in a dispute, depends on the credit's wording, the rules it incorporates and the applicable law. Fraud exceptions and national remedies are outside this article. Recheck with your bank the rules the credit incorporates, its charges, cover and release terms, and with the inspection provider the scope and sampling.
FAQ
What is a letter of credit? A bank's undertaking, usually the buyer's bank, to pay the seller against documents that comply with the credit's terms. The bank deals with documents, not goods.
How does a letter of credit work? The buyer applies to its bank, the bank issues the credit to the seller, the seller ships and presents the required documents, the banks check them, and the issuing bank pays or commits to pay at maturity. The buyer then uses the documents to collect the goods.
Does a letter of credit guarantee the quality of the goods? No. Quality is protected only as far as a required document, such as an inspection certificate with a named issuer and stated result, can show it.
Who pays the letter of credit fees? Whoever the contract and credit say. Ask your bank before applying what each charge is and who pays it.
Next step
Before opening the credit, put the specification, documentary requirements, inspection scope and the bank's charges, cover and release terms into one checklist. Ask the seller to confirm it can produce every required document, then have the issuing bank review the proposed wording before issue.
Resources
- US International Trade Administration — Trade Finance Guide: A Quick Reference for U.S. Exporters — https://www.trade.gov/report/trade-finance-guide (accessed 10 October 2026)
- US International Trade Administration — Letter of Credit — https://www.trade.gov/letter-credit (accessed 10 October 2026)
- International Chamber of Commerce — UCP 600, ICC Digital Library — https://library.iccwbo.org/content/tfb/RULES/tfb-ucp600-rules.htm?l1=ICC+Rules&l2=UCP+600&l3=Rules (accessed 10 October 2026)
- ICC Academy — Documentary credits: rules, guidelines and terminology — https://academy.iccwbo.org/international-trade/article/documentary-credits-rules-guidelines-terminology/ (accessed 10 October 2026)
- ICC Academy — A comprehensive guide to standby letters of credit — https://academy.iccwbo.org/trade-finance/article/a-comprehensive-guide-to-standby-letters-of-credit/ (accessed 10 October 2026)
- HSBC Hong Kong — Documentary credit — https://www.business.hsbc.com.hk/en-gb/products/documentary-credit (accessed 10 October 2026)
- HSBC Hong Kong — How documentary credits work — https://www.business.hsbc.com.hk/en-gb/regulations/how-documentary-credits-work (accessed 10 October 2026)
- Codex Alimentarius Commission — General Guidelines on Sampling, CXG 50-2004 (revised 2023) — https://www.fao.org/fao-who-codexalimentarius/sh-proxy/en/?lnk=1&url=https%253A%252F%252Fworkspace.fao.org%252Fsites%252Fcodex%252FStandards%252FCXG%2B50-2004%252FCXG_050e.pdf (accessed 10 October 2026)
- World Customs Organization — Origin FAQ — https://www.wcoomd.org/en/topics/origin/overview/faq-origin.aspx (accessed 10 October 2026)
