Trade Finance

Letters of credit, demystified

7 min read2025By ZWC

A letter of credit is useful when buyer and seller want payment controlled by documentary conditions. It does not make the goods conform, replace supplier due diligence or give the bank responsibility for product quality. The buyer must decide whether the documents required by the credit can be produced, checked and presented within the actual transaction timeline.

What a letter of credit actually is

A letter of credit (L/C) is a bank undertaking governed by its stated terms and applicable rules. Banks examine documents, not the physical goods. A compliant presentation can therefore support payment even when a later product dispute exists, while a documentary discrepancy can delay or complicate payment even when the goods are acceptable.

How an L/C works — in four steps

01

You open the L/C

The issuing bank creates an undertaking that is conditional on a complying presentation under the credit's stated terms.

02

The supplier ships

Goods leave against the agreed terms, and the supplier gathers the shipping documents.

03

Documents are presented

The supplier submits the documents and every one is checked against the L/C — we check them too, before they reach the bank.

04

The bank pays

On fully compliant documents, payment is released. Clean documents in, payment out.

Where L/Cs go wrong: discrepancies

A date, description, signature or document that does not meet the credit can become a discrepancy. Review the draft credit before issuance, assign each document to the party able to produce it, and test the dates against production and transport reality. Document review reduces error; it does not guarantee a clean presentation or banking outcome.

Write only conditions that a named party can evidence with a document the bank can examine.

The right method for each order

An L/C is not always the answer. Part of handling trade finance well is choosing the instrument that fits the order, the relationship and your cash position:

L/C
Letter of credit. A bank undertaking that is conditional on compliant documents; suitability depends on the transaction, counterparties, costs and wording.
T/T
Telegraphic transfer. A bank-to-bank wire — simple and fast, common with trusted suppliers.
D/P
Documents against payment. The buyer pays to receive the shipping documents.
D/A
Documents against acceptance. Documents released against a promise to pay at a later date.
O/A
Open account. Ship now, pay later. The lowest cost — and the highest trust.

How we handle it

ZWC can help the buyer organize commercial inputs and document responsibilities with the supplier. The issuing bank, nominated or confirming bank, freight parties and qualified trade-finance advisers remain responsible for their respective decisions. Confirm the current rules, fees and wording with the banks handling the actual credit.

Three questions before choosing an L/C

Preparing an order that may use an L/C?

Send the purchase scope, proposed payment terms and document list. ZWC can help organize supplier-side inputs for review with your bank and qualified trade-finance adviser.

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