Guide

Letter of credit: documentary credit explained

Harbor Electronics sourced power-management ICs from a Shenzhen contract manufacturer on 90-day open account. When a 12,000-unit lot failed incoming quality inspection, the supplier refused to accept a return and demanded full payment on the original invoice. Legal counsel in two jurisdictions tied up $4.2 million of inventory value for 11 months while production lines idled. Treasury's postmortem was blunt: open account had saved 0.4% in bank fees but transferred all performance risk to the buyer with no neutral payment trigger.

The refactor moved 78% of Asia import volume onto confirmed sight letters of credit under ICC Uniform Customs and Practice (UCP 600). Suppliers received payment within five banking days of compliant document presentation; quality disputes shifted to post-payment warranty claims instead of payment hostage situations. Dispute cycles fell 68%, three tier-one fabs restored credit lines totaling $22 million, and all-in trade finance cost rose only 1.1% of landed COGS. This guide explains how documentary credits work, LC structures, document compliance, discrepancy handling, standby variants, the Harbor Electronics case, a technique decision table versus supply chain finance and open account, pitfalls, and a treasury checklist.

What a letter of credit is

A letter of credit (LC), also called a documentary credit, is a bank's conditional payment promise. The issuing bank commits to pay the beneficiary (usually the exporter/seller) a stated amount when the beneficiary presents documents that strictly match the LC terms. Payment depends on documents, not on whether the underlying goods met the buyer's expectations — that separation is the core trade-off.

Parties in a typical import LC

Applicant — the buyer/importer who requests the LC.
Beneficiary — the seller/exporter who receives payment.
Issuing bank — the applicant's bank that opens the LC.
Advising bank — notifies the beneficiary; may confirm.
Confirming bank (optional) — adds its own payment undertaking, removing issuing-bank country risk.
Negotiating bank (optional) — purchases documents from the beneficiary before reimbursement.

The flow: applicant and beneficiary agree commercial terms in a sales contract; applicant instructs its bank to issue an LC mirroring those terms; beneficiary ships goods and assembles documents; bank examines documents against the LC; if compliant, bank pays (sight) or accepts a time draft (usance). Goods and payment run on parallel rails linked only by document descriptions.

LC types that matter in practice

Sight vs usance (deferred payment)

A sight LC pays the beneficiary when compliant documents are presented — typically within five banking days under UCP 600 Article 14. Cash moves immediately (or the bank discounts). A usance LC (time or deferred) accepts a draft payable 30, 60, 90, or 180 days after sight or bill-of-lading date. The beneficiary gets paid early by negotiating the draft at a discount; the applicant's cash outflow matches the tenor. Usance LCs extend days payable outstanding without open-account trust.

Irrevocable vs standby

Commercial trade LCs are almost always irrevocable — they cannot be amended or cancelled without all parties' consent. A standby letter of credit is a payment-backup instrument: the beneficiary draws only if the applicant fails an obligation (pay invoice, repay loan, perform contract). Standbys use ISP98 rules; commercial LCs use UCP 600. Treasurers often hold standbys for lease deposits, construction retainage, and utility guarantees while using commercial LCs for goods trade.

Confirmed vs unconfirmed

An unconfirmed LC carries only the issuing bank's undertaking. If that bank is in a country with transfer restrictions or weak correspondent relationships, the exporter may refuse to ship. A confirmed LC adds the advising (or another) bank's independent payment promise in the exporter's country. Confirmation fees run 0.1–0.5% per quarter but are standard for emerging-market issuers and first-time trading relationships.

Transferable and revolving structures

Transferable LCs let a middleman (trading company) transfer portions to upstream suppliers — common in commodity chains. Revolving LCs auto-reinstate after each drawing up to a cap, useful for recurring monthly shipments without reissuing paperwork. Both add operational complexity; legal review of partial transfers prevents beneficiary substitution fraud.

UCP 600 and the doctrine of strict compliance

ICC Publication 600 governs most commercial LCs worldwide. Banks examine documents only — they do not inspect goods. The standard is strict compliance: any discrepancy between presented documents and LC terms allows the bank to refuse payment and hold documents for applicant instructions.

Common document sets

Commercial invoice — must match LC amount, description, and applicant name exactly.
Transport document — bill of lading (ocean), airway bill, or multimodal document per Incoterms.
Packing list — weights, marks, and carton counts consistent with other docs.
Certificate of origin — required for preferential duty treatment or sanctions screening.
Insurance policy/certificate — coverage amount, risks, and dates per LC (CIF/CIP shipments).
Inspection certificate — when LC mandates pre-shipment survey by named agency.

Infamous discrepancy triggers: invoice dated after latest shipment date; “about” quantity tolerance exceeded; port name abbreviated; goods description one word different from LC; bill of lading marked “freight collect” when LC requires “freight prepaid.” Experienced documentary teams run a pre-check against the LC before courier submission; one rejected presentation can strand goods in port storage accruing demurrage.

Discrepancies, waivers, and negotiation

When the negotiating bank finds discrepancies, it telephones the applicant: accept with waiver, reject, or re-present corrected documents. Applicants face pressure — supplier wants cash, port fees accumulate, production waits. Waiving minor discrepancies is common; waiving material ones (wrong quantity, late shipment) erodes leverage in quality disputes.

Documentary collections (D/P, D/A) sit between open account and LCs: banks handle documents but do not guarantee payment. Cheaper than LCs but no bank payment undertaking; useful only when parties trust each other moderately. LCs are the instrument when trust is low or country risk is high.

Post-payment, the applicant's recourse for non-conforming goods is the sales contract — warranty claims, arbitration, insurance — not the LC. That is why inspection certificates and Incoterms matter before shipment, not after documents are paid.

Costs, limits, and balance-sheet treatment

LC fees typically include: issuance (0.1–0.25% of face), amendment ($50–$150 each), confirmation (0.1–0.5% per 90 days), negotiation (0.1–0.2%), and courier. On a $2 million sight LC, all-in first-year cost often lands at 0.8–1.5% if confirmed and amended twice.

LCs consume the applicant's bank credit line at face value (or a utilization haircut). Unlike accounts receivable factoring, which funds the seller's ledger, LCs secure the buyer's payment obligation to foreign suppliers. Large importers stack LC lines with revolving credit facilities and commercial paper programs for domestic payables.

Off-balance-sheet treatment is rare for applicants; LC contingencies appear in credit agreement schedules and may trigger springing covenants when utilization exceeds thresholds.

Harbor Electronics: from open account to confirmed sight

Harbor's Asia sourcing mix was 62% open account (net 60–90), 23% documentary collection, 15% LC (only for new suppliers). After the $4.2 million dispute, treasury mandated confirmed sight LCs for any supplier relationship under 24 months or any single PO above $500k.

Implementation steps:

Negotiated a $45 million syndicated LC sub-limit inside an existing revolver (SOFR + 225 bps on utilized LC exposure).
Standardized a master LC template with Incoterms 2020 DAP warehouse, inspection by SGS pre-shipment, and 5% quantity tolerance.
Hired a documentary services firm for beneficiary-side pre-check on Harbor's top eight suppliers.
Shifted quality holds to warranty escrow: 3% of invoice held 90 days post-payment instead of blocking LC presentation.

Results after four quarters: LC volume rose from 15% to 78% of import COGS; average document rejection rate stabilized at 4.2% (down from 19% when suppliers self-prepared docs); supplier payment days from B/L date fell from 47 to 8; all-in LC cost was 1.1% of covered purchases versus imputed 2.4% cost of capital on trapped dispute inventory. Open account remains for long-tenured suppliers under $200k PO caps.

Technique decision table

Structure	Best when	Strengths	Weaknesses
Confirmed sight LC	New supplier, emerging-market issuer, high shipment value	Fast payment on clean docs; removes country/issuer risk	Highest fees; strict document compliance
Unconfirmed usance LC	Trusted issuer bank, buyer needs DPO extension	Supplier discounts draft; buyer preserves tenor	Issuer bank risk; discount rate volatility
Standby LC	Performance/lease/utility guarantee, not goods flow	Simple draw on default; ISP98 framework	Wrong tool for recurring trade; fraud draw risk
Documentary collection (D/P, D/A)	Moderate trust, lower value, established relationship	Lower bank fees than LC	No payment guarantee; still document friction
Open account	Long-tenured supplier, low value, domestic trade	Zero bank fees; simplest ops	Full performance and country risk on buyer
Reverse factoring / SCF	Investment-grade buyer, supplier early-payment program	Low supplier financing cost; buyer extends DPO	Buyer must sponsor; not a cross-border default shield

Common pitfalls

LC–contract mismatch — sales contract terms that contradict the LC invite disputes nobody can arbitrate cleanly.
Vague goods descriptions — “electronic components” fails when invoice says “PMIC modules”; specify harmonized codes and model lists.
Latest shipment date traps — single-date LCs with no extension clause strand partial shipments.
Ignoring confirmation need — unconfirmed LCs from restricted jurisdictions may be unnegotiable at any price.
Waiving material discrepancies — accepting wrong quantity docs destroys quality leverage.
Demurrage blind spots — paid LC with goods stuck in port because original B/L was lost or endorsed wrong.
Sanctions and dual-use — banks reject docs when routing, parties, or HS codes hit screening lists.
Amendment lag — PO changes without synchronized LC amendments are the top preventable discrepancy source.

Trade finance checklist

Align sales contract, PO, Incoterms, and LC text before issuance.
Choose sight vs usance based on CCC target and supplier discount access.
Require confirmation when issuing bank country risk exceeds appetite.
Specify exact document names, copies, and field wording in LC field 46A.
Set quantity/price tolerance (typically +/- 5% unless stricter needed).
Mandate pre-shipment inspection when quality history is weak.
Run documentary pre-check before courier to negotiating bank.
Define internal waiver authority levels for discrepancy acceptance.
Track LC line utilization against revolver and covenant headroom.
Separate payment (LC) from warranty/recourse (contract + escrow).
Audit amendment turnaround SLA with ops and banking partners.
Review open-account exceptions quarterly with supplier scorecards.

Key takeaways

An LC is a bank payment promise conditioned on documents, not goods quality.
Confirmed sight LCs trade 1–1.5% fees for elimination of payment hostage risk in cross-border trade.
UCP 600 strict compliance means one typo can block payment — pre-check documents before presentation.
Harbor Electronics cut dispute cycles 68% by pairing LCs with warranty escrow instead of open-account trust.
Match instrument to trust level: LC for strangers, collections for acquaintances, open account only with earned history.