Marcus Weber
Senior Trade Finance Advisor
Two decades in trade finance across European and Asian banks, advising corporates on payment instruments, credit structures, and documentary risk.
Short answer
A letter of credit (LC) is an irrevocable undertaking by the buyer's bank to pay the seller a defined amount upon presentation of complying documents — typically bill of lading, commercial invoice, insurance certificate, and inspection certificate — within a validity window. Governed by ICC UCP 600, LCs substitute bank credit for buyer credit, making them the benchmark secure payment term for international trade, at a cost of roughly 1–3% of value.
The Independence Principle
The LC's power — and its most misunderstood feature — is independence: the credit is a separate transaction from the sales contract. Banks deal in documents, not goods. A presentation that complies with the credit's terms must be honored even if the underlying goods are disputed; conversely, perfect goods with non-complying documents can be refused.
The Parties and Their Roles
| Party | Role | Risk Carried |
|---|---|---|
| Applicant (buyer) | Requests the LC, reimburses the issuing bank | Pays against documents, not verified goods |
| Issuing bank | Issues the irrevocable undertaking to pay | Buyer credit risk — must pay even if applicant fails |
| Advising bank | Authenticates and advises the LC to the beneficiary | Authentication only, no payment undertaking |
| Confirming bank | Adds its own undertaking to honor (confirmed LC) | Issuing bank and country risk — the seller's strongest position |
| Beneficiary (seller) | Ships goods and presents complying documents | Documentary compliance risk |
The confirmation decision is the seller's key structural choice: an LC confirmed by a bank in the seller's jurisdiction removes both buyer and issuing-bank/country risk, at an additional confirmation fee. For LCs from banks in unfamiliar jurisdictions, confirmation is usually worth its cost.
LC Types in Practice
- Irrevocable LC — the standard; cannot be amended or cancelled without all parties' consent (UCP 600 makes all credits irrevocable by default)
- Confirmed LC — adds a second bank's undertaking in the beneficiary's market
- Sight LC — payable immediately upon complying presentation
- Usance (deferred) LC — payable at a future date, e.g., 90 days from bill of lading date; seller can discount the deferred undertaking
- Transferable LC — allows the beneficiary to transfer portions to second suppliers; common for trading intermediaries
- Back-to-back LC — two linked credits financing intermediary transactions without transferability
- Standby LC (SBLC) — a guarantee instrument payable on default certification rather than performance documents
Discrepancies: Where LC Transactions Fail
Industry studies consistently find 60–75% of first presentations contain discrepancies. Banks refuse non-complying presentations; the security then evaporates and the transaction reverts to commercial negotiation between buyer and seller — with goods already in transit.
- Data conflicts between documents — weights, quantities, or descriptions that don't reconcile
- Late shipment or presentation beyond the credit's validity
- Missing or incorrect endorsements on transport documents
- Documents issued by parties the credit doesn't authorize
- Insurance certificates below the required 110% CIF cover
- Stale transport documents presented after the 21-day window
Discipline prevents most discrepancies: draft the credit against documents you can actually produce, pre-check presentations against the credit before submission, and use experienced documentary staff or banks' pre-check services for high-value transactions.
Costs and When LCs Are the Right Tool
Total LC cost typically runs 1–3% of value: issuing fees, advising and confirmation charges, amendment fees, and discrepancy penalties. Against this, weigh the alternatives — open account with credit insurance (0.3–1% plus retention), escrow (0.5–2% with physical verification), or advance payment (free but commercially difficult).
LCs remain the right instrument for large commodity transactions, regulated markets requiring bank intermediation, counterparties in jurisdictions where escrow infrastructure is thin, and transactions where banks on both sides have established correspondent relationships. For standard manufactured-goods trade, escrow increasingly wins on cost, speed, and the fact that it can pay against verified goods rather than documents alone.
Key takeaways
- An LC is a bank's independent undertaking to pay against complying documents — not against goods.
- Confirmation adds a second bank's undertaking in the seller's market — the strongest seller position.
- 60–75% of first presentations carry discrepancies; documentary discipline is the real skill.
- UCP 600 governs interpretation worldwide — cite it in every credit.
- LCs cost 1–3% of value; escrow and credit insurance are often cheaper for standard goods trade.
Frequently asked questions
An LC pays against performance documents (shipment happened). A bank guarantee or standby LC pays against a default certification (something failed). LCs are payment instruments for performing transactions; guarantees are security instruments for non-performance.
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