Trade Finance / Learning brief
Letters of credit and documentary trade
Your notes
In simple terms / 01
What this means in plain language
Walks a letter of credit from issue to payment so you can see how a bank's promise replaces trust between a buyer and a seller who have never met, and where the payment leg finally settles between the banks.
A letter of credit is a written undertaking by a bank, given at a buyer's request, to pay a seller a stated amount provided the seller presents documents that comply exactly with the credit's terms. It solves the standoff in cross-border trade where the seller will not ship before being sure of payment and the buyer will not pay before being sure of the goods, by substituting the issuing bank's creditworthiness for the buyer's. Four roles run the arrangement: the importer (applicant) asks its bank to issue the credit; the issuing bank carries the promise to pay; the advising or nominated bank passes the credit to the seller, checks the documents, and forwards them; and the exporter (beneficiary) ships and presents documents to claim payment. One bank often plays more than one role. The crucial idea is that documents, not the goods themselves, trigger payment: on a compliant presentation the banks settle the payment leg between them, often through a correspondent relationship, before the exporter is credited, even while the goods may still be in transit. If the documents are discrepant, do not comply with the terms, the issuing bank can withhold payment until the buyer agrees to waive the discrepancy. The bank manages payment risk through paperwork, not quality risk through inspection.
Key takeaways / 03
Three things to remember
- 01
A letter of credit replaces trust between buyer and seller with an issuing bank's promise to pay against compliant documents.
- 02
The roles are importer, issuing bank, advising or nominated bank, and exporter, and one bank can play several.
- 03
Documents, not goods, trigger payment; discrepant documents let the issuing bank withhold payment until the buyer waives the discrepancy.
Practical use cases / 04
Where you would use this
An exporter dealing with a new overseas buyer insists on a letter of credit so a bank's promise, not the buyer's goodwill, secures payment.
A trade-finance operations team examines a documentary presentation against the credit's terms to decide whether to pay or cite discrepancies.
A treasurer chooses between a letter of credit and open-account terms by weighing payment security against cost and speed.
Worked example / 05
Put the idea into a real situation
Illustrative example (SYNTHETIC / TRAINING ONLY): Demo Trading Ltd agrees to buy EUR 200,000 of goods from Example Supplies Ltd, who insists on a letter of credit for a first-time deal. Demo Trading asks Bank Alfa to issue the credit; Bank Alfa issues an MT700 to Meridian Bank, which advises Example Supplies. Example Supplies ships and presents a commercial invoice and bill of lading. The banks examine the documents; on a compliant presentation, payment is authorised, the banks settle the payment leg between them, and Meridian credits Example Supplies, all while the goods may still be at sea. Had the shipment date been after the credit's latest date, Bank Alfa could have cited the discrepancy and withheld payment pending a waiver. This construction was not verified against a primary standards source this pass.
Operational sequence / 06
Follow the message and decision path
This compact sequence is a learning model. Exact routing and rulebook behavior can vary by scheme, participant, and implementation.
Read the steps as text
- 01MessageThe importer asks Bank Alfa to issue a creditDemo Trading Ltd (importer) → Bank Alfa (issuing bank) · LC application
Demo Trading applies to its bank to open a letter of credit in favour of the exporter, setting out the amount, the documents required, and the shipment terms. The bank is being asked to lend its promise, so it assesses the importer's credit first.
- 02MessageBank Alfa issues the credit to MeridianBank Alfa (issuing bank) → Meridian Bank (advising / nominated) · MT700
Bank Alfa issues the documentary credit to the exporter's bank as an MT700. From this point the issuing bank — not the importer — carries the promise to pay against compliant documents.
- 03MessageMeridian advises the exporterMeridian Bank (advising / nominated) → Example Supplies Ltd (exporter) · Advise credit
Meridian authenticates the credit and advises it to Example Supplies, so the exporter can rely on it and knows exactly which documents it must present to be paid. As nominated bank, Meridian is authorised to examine documents and pay.
- 04MessageThe exporter ships and presents documentsExample Supplies Ltd (exporter) → Meridian Bank (advising / nominated) · Present documents
Example Supplies ships the goods and presents the required documents — typically including the bill of lading, invoice, and insurance — to Meridian. The banks deal only in these documents, never in the goods themselves.
- 05MessageMeridian checks and forwards the documents to Bank AlfaMeridian Bank (advising / nominated) → Bank Alfa (issuing bank) · Documents forwarded
Meridian carries out its own first check of the presentation, then forwards the full document set to Bank Alfa, the issuing bank, for examination against the credit.
- 06ProcessingBank Alfa examines the documentsBank Alfa (issuing bank)
Bank Alfa examines the presentation against the credit's terms. Payment is triggered only if the documents comply on their face — a wrong date or a missing endorsement can break it.
Screening checkpoint: Trade-finance screening — Parties, goods description, and banks in the chain are screened; a hit can hold settlement regardless of documentary compliance.
- 07MessageBank Alfa authorises payment on a compliant presentationBank Alfa (issuing bank) → Meridian Bank (advising / nominated) · MT754
The documents comply, so Bank Alfa advises payment or acceptance with an MT754. The bank's promise has crystallised into an obligation to pay the presenting bank.
- 08SettlementThe payment leg settles between the banksBank Alfa (issuing bank) → Meridian Bank (advising / nominated)
The payment obligation is discharged across the banks' correspondent accounts — Bank Alfa's nostro debited, Meridian's account credited — the same way any cross-border interbank obligation settles. The documentary event triggered it; correspondent banking settles it.
- DR Bank Alfa nostro serving Meridian — USD 480,000.00
- CR Meridian settlement account — USD 480,000.00
- 09PostingMeridian credits the exporterMeridian Bank (advising / nominated)
Meridian credits Example Supplies. The trade payment is complete end to end: importer's bank promised, documents examined, banks settled, exporter paid — and the importer takes up the documents to collect the goods.
- CR Exporter's account at Meridian — USD 480,000.00
Evidence & review / 07
Evidence & review
General to documentary letters of credit in cross-border trade; illustrative of roles and the payment leg, not a substitute for the applicable trade-finance rules or a bank's own procedures.
What this brief simplifies: SYNTHETIC / illustrative. Importer, exporter, banks, amounts, and documents are invented for teaching. Documentary-credit practice is governed by detailed rules not reproduced here; message names are kept verbatim but specific field content is simplified and was not verified against a primary standards source this pass.
Sources for this brief2
- Scheme-specific rule
Swift Standards MT (annual standards releases) ↗ — Swift · Category 7 documentary credit messages, including MT700 and MT754
Full field-level specifications live in the Swift Knowledge Centre User Handbook behind a swift.com login. Coexistence for in-scope FI-to-FI payment instructions ended on 22 November 2025, but treatment differs by MT: some instructions are NAKed and selected messages can enter temporary, chargeable contingency conversion. Reporting, initiation, investigations and correspondence follow separate roadmaps.
- Simplified educational illustration
Payments Signal editorial teaching models — Payments Signal · Illustrative letter-of-credit walkthrough; all parties synthetic
Used wherever diagrams, scenarios, figures, or example values are didactic constructions rather than sourced facts; every such use carries a simplifications disclosure. All people, companies, banks, and list entries in examples are fictional.