Corporate and Business Law (Global) · Transportation documents and means of payment

Documentary Credits and Letters of Credit Explained

Updated 11 October 2026 · Fact-checked

A documentary credit (letter of credit) is a bank's promise to pay the seller if the seller presents documents that comply with the credit's terms. The bank deals only with documents, not goods. To solve questions, identify the parties, check the credit type, then test the documents against the terms.

Understand Documentary Credits and Letters of Credit

A letter of credit solves a trust problem in international sales. The seller does not want to ship goods without a guarantee of payment. The buyer does not want to pay before goods are shipped. A bank steps in. It promises the seller payment once the seller shows the right documents.

The main parties are:

Applicant: the buyer, who asks their bank to open the credit.
Issuing bank: the buyer's bank, which issues the credit and promises to pay.
Beneficiary: the seller, who is paid if documents comply.
Advising bank: usually in the seller's country. It tells the seller the credit exists and checks it looks genuine.
Confirming bank: a bank that adds its own promise to pay, on top of the issuing bank's.

The credit is a separate contract from the sale contract. This is the autonomy principle. Under UCP 600 (the ICC's Uniform Customs and Practice for Documentary Credits), banks deal with documents, not goods, services or performance. If the goods are poor but the documents comply, the bank must still pay. A dispute about the goods is for the buyer and seller to settle between themselves.

The second key idea is strict compliance. The documents must comply on their face with the credit's terms, UCP 600 and international standard banking practice. The bank examines them on their face. A complying presentation obliges the issuing bank (or the confirming bank) to honour. If the documents do not comply, the bank may refuse them, even for a small discrepancy. Banks have a limited time to examine documents. Under UCP 600 this is a maximum of five banking days after presentation. Presentation must be made within any period after shipment stated in the credit. If the credit states none, the limit is 21 calendar days after shipment. In every case, presentation must be made no later than the credit's expiry date.

Credits differ by type. Under UCP 600 a credit is irrevocable by nature. It cannot be amended or cancelled without the agreement of the issuing bank, the confirming bank (if any) and the beneficiary. A credit may be confirmed or unconfirmed, and may be payable at sight or after a deferred period.

Key formulas to remember

Autonomy principle: Credit ≠ sale contract; banks deal in documents, not goods; The bank must pay against complying documents even if the buyer claims the goods are defective. The bank is not concerned with the underlying sale.
Strict compliance: Documents comply on their face with the credit's terms, UCP 600 and standard banking practice → issuing (or confirming) bank must honour; A non-complying presentation may be refused. The bank looks only at the documents, not the goods or the sale contract, which is a separate contract.
Irrevocability under UCP 600: Credit = irrevocable, even if it does not say so; It cannot be amended or cancelled without the agreement of the issuing bank, the confirming bank (if any) and the beneficiary. Revocable credits no longer exist under UCP 600.
Confirmed credit: Issuing bank's promise + confirming bank's promise; The seller has two banks undertaking to pay. Useful when the seller doubts the issuing bank or the buyer's country.
Examination period: Maximum 5 banking days after presentation; The bank must decide whether to honour or refuse within this period.
Presentation period: Within any period stated in the credit, otherwise within 21 calendar days after shipment; in every case no later than the expiry date; Late documents are non-complying. The expiry date always applies as well as the shipment-based period, so check both.

How to solve Documentary Credits and Letters of Credit questions

Use this method for any scenario or objective question on letters of credit. Work from the parties to the documents, then to the outcome.

1Identify who is who: applicant (buyer), beneficiary (seller), issuing bank, and any advising or confirming bank.
2Identify the type of credit: irrevocable (the default under UCP 600), confirmed or unconfirmed, sight or deferred payment.
3Separate the sale contract from the credit. If the dispute is about goods quality, the autonomy principle applies and the bank still pays against complying documents.
4List the credit's requirements: documents required, descriptions, amounts, shipment date, expiry date and presentation period.
5Compare each document with those terms on its face. Look for mismatches in description, amount, dates and missing documents.
6Apply strict compliance: if the documents do not comply, the bank may refuse. If they comply, the bank must honour.
7Check timing: was presentation within the expiry date and the presentation period, and did the bank decide within five banking days?
8State the outcome clearly and name the principle you used.

Quickest way: Three-question shortcut

When to use it: Use this for Section A and Section B objective questions where time is tight and you only need to choose the correct statement.

Ask: is the problem about documents or about goods? If goods, the bank does not care (autonomy).
Ask: do the documents comply on their face with the credit and arrive in time? If not, the bank may refuse (strict compliance).
Ask: who is promising to pay? Issuing bank only means unconfirmed. Issuing plus another bank's promise means confirmed.
Remember that under UCP 600 every credit is irrevocable, so reject any option that says a credit can be cancelled unilaterally by the issuing bank.

Common mistakes in Documentary Credits and Letters of Credit

Saying the bank can refuse payment because the goods are defective.
Students think the bank is protecting the buyer in the sale contract.
Fix: Remember the autonomy principle. The bank checks documents only. The buyer must claim against the seller under the sale contract.
Treating a minor discrepancy as acceptable.
Students apply a common-sense 'close enough' view.
Fix: Under strict compliance, the documents must match the credit. A discrepancy gives the bank the right to refuse, so assume it matters unless the question says otherwise.
Confusing the advising bank with the confirming bank.
Both are usually in the seller's country and both deal with the seller.
Fix: An advising bank only passes on the credit. A confirming bank adds its own undertaking to pay. Only confirmation adds a second payment promise.
Describing revocable credits as a current option.
Older textbooks and notes still list revocable credits.
Fix: UCP 600 treats credits as irrevocable. A revocable credit is not available under it. If asked about the difference, explain that the old distinction has gone.
Saying the buyer pays the seller directly under the credit.
Students focus on the buyer and seller and forget the bank's role.
Fix: The issuing bank pays (or the confirming bank). The buyer reimburses the issuing bank. Trace the flow of documents and money through the banks.
Ignoring time limits.
Students check the documents but not the dates.
Fix: Always check expiry date, the presentation period after shipment and the five-banking-day examination limit.

Worked examples

Example 1

Alpha Ltd (seller) ships machinery to Beta Co (buyer) under an irrevocable letter of credit issued by Beta's bank. The credit requires a bill of lading, a commercial invoice and an insurance certificate. Alpha presents all three on time and they match the credit. Beta then says the machines are faulty and tells its bank not to pay. Can the bank refuse?

Show the solution

Parties: Alpha is the beneficiary, Beta is the applicant, and Beta's bank is the issuing bank.
The credit is irrevocable, so Beta cannot cancel it alone.
Beta's complaint concerns the goods, which belongs to the sale contract.
Under the autonomy principle the credit is separate from the sale contract. The bank deals with documents, not goods.
The documents comply on their face and were presented on time, so strict compliance is satisfied.

Answer: The bank cannot refuse on the ground that the goods are faulty. It must honour the credit. Beta must pursue Alpha separately under the sale contract.

Example 2

A credit requires a commercial invoice describing the goods as '500 cotton shirts'. The seller presents an invoice describing '450 cotton shirts', together with the other required documents, all on time. The issuing bank wants to refuse. Explain the bank's position.

Show the solution

The bank examines documents on their face against the credit's terms.
The invoice description must correspond with the description in the credit. Rewording or extra detail that does not conflict would not necessarily be a discrepancy.
Here the invoice states 450 shirts, but the credit requires 500. This conflicts with the credit, so it is a discrepancy.
Under strict compliance, a discrepancy between the document and the credit allows the bank to refuse.
The bank must give notice of refusal within five banking days of presentation and state the discrepancies.
The seller can try to correct the invoice and re-present within the expiry date and presentation period, or ask the buyer to waive the discrepancy.

Answer: The bank is entitled to refuse because the invoice description conflicts with the credit (450 shirts instead of 500). The seller should correct the invoice and re-present in time, or seek the buyer's waiver.

Exam tips

In Section B scenarios, underline the dates. Many questions turn on whether presentation was late or the shipment date breached the credit.
If an option says the bank checks the quality of goods, reject it. Documents, not goods, are examined.
Know the difference between advising and confirming bank. Confirmation is the feature that adds a second payment undertaking.
For any option mentioning 'revocable', remember that UCP 600 credits are irrevocable by default.
Objective questions score all or nothing, so read all four options before choosing and look for the one that states the principle precisely.

Practice questions from Transportation documents and means of payment

Documentary Credits and Letters of Credit in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

CS ProfessionalLetter of Credit

Documentary Credits and Letters of Credit: frequently asked questions

How does a documentary letter of credit work step by step?

The buyer and seller agree the sale on credit terms. The buyer asks its bank to issue a credit in the seller's favour. The seller ships the goods and presents the required documents to the bank. If they comply, the bank pays, and the buyer then reimburses the bank and receives the documents.

What is the doctrine of strict compliance under UCP 600?

The documents presented must match the terms of the credit on their face. If they do not, the bank may refuse them. The bank does not look beyond the documents to the goods or the sale contract.

What is the difference between revocable and irrevocable letters of credit?

A revocable credit could be amended or cancelled by the issuing bank without notice to the seller. An irrevocable credit cannot be changed without everyone's agreement. UCP 600 treats all credits as irrevocable, so revocable credits are no longer used under it.

What does a confirmed letter of credit mean compared with an unconfirmed one?

A confirmed credit has a second bank, the confirming bank, adding its own promise to pay alongside the issuing bank. An unconfirmed credit relies only on the issuing bank. Sellers ask for confirmation when they worry about the issuing bank or the buyer's country.

What is the autonomy principle in letters of credit?

The credit is a separate contract from the sale. Banks deal with documents, not goods. A dispute over the goods does not stop the bank paying against complying documents.