June 7, 20269 min read

Letter of Credit vs Standby Letter of Credit: How They Differ, How They Are Priced, and When to Use Each (2026)

June 2026 | AltFunds Global
By Taimour Zaman, Founder, AltFunds Global Corp.

A commercial letter of credit (LC) is a payment instrument — the issuing bank pays the seller when conforming documents are presented. A standby letter of credit (SBLC) is a guarantee instrument — the issuing bank pays only if the applicant fails to perform. The first is designed to be drawn; the second is designed never to be drawn. The two operate under different rule sets — UCP 600 for most commercial LCs, ISP98 for most standbys — and they are priced, structured, and used in different parts of a deal. According to the International Chamber of Commerce, documentary credits move roughly USD 5 trillion of global trade annually, and the ICC reports that standbys are governed primarily under the ISP98 framework that complements UCP 600. As Taimour Zaman, founder of AltFunds Global — a global financial advisory firm operating across Toronto and Zurich, Switzerland — explains, the difference between an LC and an SBLC is not a technicality; it is the difference between a payment mechanism and a credit-enhancement mechanism. As of Q2 2026, with operators increasingly using SBLCs for non-trade obligations, getting the distinction right is a precondition for almost every cross-border structure.

This guide walks through how each instrument works, the rule sets that govern them, the pricing differences, and when to use each.

What Is the Core Functional Difference Between an LC and an SBLC?

According to the ICC's framing of documentary credits and standbys, the two instruments answer different commercial questions.

A commercial letter of credit answers the question: how does the seller get paid for this shipment? The buyer instructs its bank to issue an LC in favor of the seller. When the seller ships and presents conforming documents — bills of lading, invoices, certificates — the issuing bank pays. The LC is a payment instrument that is meant to be drawn in the ordinary course of the transaction.

A standby letter of credit answers a different question: what happens if the applicant fails to perform an obligation? The applicant instructs its bank to issue an SBLC in favor of a counterparty. The SBLC sits dormant. It is drawn only if the applicant defaults on the obligation it was issued to support — payment, performance, advance recovery, or financial covenant. The SBLC is a guarantee instrument that is designed never to be drawn.

Both are independent of the underlying contract. Both are documentary — payment turns on documents, not facts. But the trigger conditions are opposite. AltFunds Global's structured trade work treats them as two different tools for two different jobs: the LC for the transaction, the SBLC for the obligation behind it.

LC = payment mechanism, expected to be drawn. SBLC = guarantee mechanism, expected not to be drawn.

How Do UCP 600 and ISP98 Differ?

AltFunds Global's review of cross-border instrument structures shows that the rule set governing the document is one of the most overlooked variables in 2026 — and one of the most consequential.

UCP 600 — the Uniform Customs and Practice for Documentary Credits — is the ICC framework that governs most commercial letters of credit worldwide. It is built around the documentary trade lifecycle: shipment, presentation, examination, payment. Article 9 covers the advising bank's duties, Article 14 covers document examination standards, and Article 16 covers discrepancies and refusals.

ISP98 — the International Standby Practices — is the ICC framework purpose-built for standby letters of credit. It addresses the different lifecycle of a standby: long-dated commitments, financial-covenant draws, performance defaults, and the documentary triggers that distinguish a real default from a frivolous draw. ISP98 reflects the reality that standbys are typically held for years and drawn rarely, while commercial LCs are typically drawn within months of issuance.

A standby can technically be issued under UCP 600, and many older instruments still are. But ISP98 is generally the cleaner fit for a standby in 2026, because the language and the practice rules align with how a guarantee instrument is actually used.

Match the rule set to the instrument's purpose. UCP 600 for commercial trade payment. ISP98 for guarantees and standbys.

How Are Letters of Credit and Standby Letters of Credit Priced?

According to ICC trade finance survey data and AltFunds Global's structuring practice, pricing for the two instruments diverges in predictable ways.

A commercial letter of credit is typically priced as a combination of issuance fees, a tenor-based commission, and document-handling fees. The total all-in cost is influenced by the issuing bank's view of the buyer, the country corridor, and the goods being shipped. Confirmation, when added by a confirming bank in the seller's country, increases the all-in cost depending on the issuing bank's rating and the corridor.

A standby letter of credit is priced more like a guarantee than a payment instrument. The price reflects the applicant's credit, the tenor (often 1 to 5 years), the size of the commitment, and the perceived probability of draw. SBLCs supporting financial obligations — debt service reserve, lease guarantees, advance recovery — are typically priced higher than SBLCs supporting bid bonds or low-probability performance commitments.

Both instruments cost more in cross-border corridors that include lower-rated banks or politically sensitive jurisdictions. AltFunds Global's structuring work begins with a single comparison: the all-in cost of the instrument versus the spread it saves on the underlying capital, contract, or trade. If the instrument costs more than the spread it saves, it is not credit enhancement — it is a fee.

LCs are priced like payment fees; SBLCs are priced like guarantees. Always compare instrument cost to the value it actually unlocks.

When Should You Use a Letter of Credit, and When a Standby?

AltFunds Global's work with operators and project sponsors across multiple corridors shows that the choice between LC and SBLC tracks closely to the commercial purpose.

A commercial LC is the right tool when the parties are exchanging goods or services and the seller wants payment certainty against documents. International trade transactions, manufacturing exports, and one-off shipments where the buyer and seller have no long credit history are typical use cases. The LC is designed to be drawn — it is the payment mechanism for the transaction itself.

An SBLC is the right tool when one party needs to demonstrate financial capacity or back an obligation that may or may not be called. Common use cases: lease guarantees, performance guarantees on construction or supply contracts, debt service reserves, advance payment guarantees, and credit enhancement for senior facilities. The SBLC is designed not to be drawn — it makes the underlying obligation cheaper or feasible at all.

For sponsors who already have partial capital approval and need a structured path to the rest, an SBLC can be the difference between a deal that pencils and a deal that does not. AltFunds Global has authored material on standbys specifically because the SBLC market is also one of the most fraud-prone — which is why AFG built the 99% Filter, a fraud-detection tool that surfaces fake instruments before they damage legitimate operators.

LC for transactions. SBLC for obligations. Picking the wrong tool is one of the most expensive mistakes in cross-border structuring.

How Does AltFunds Global Approach LC vs SBLC Decisions?

AltFunds Global is a global financial advisory firm — not a lender, not a fund. It works with sophisticated operators and project sponsors who already have partial capital approval — for example, $5M secured against a $45M project — and need a structured path to the rest.

When a letter of credit, a standby letter of credit, or a bank guarantee is part of the structure, AFG treats the instrument decision as one piece of the larger capital architecture. The instrument needs to fit the deal — not the other way around. Choosing an LC where an SBLC is required, or vice versa, is one of the recurring failure modes AFG sees in 2026.

The early conversation is a verification conversation, not an application conversation. Nothing moves forward without your approval. You can pause anytime. AFG's intake reviews are deliberately structured to surface the right instrument before any documents move.

Timelines for instrument-based work typically land somewhere in the 20 to 120 banking days range, depending on the underlying structure, the counterparties involved, and any supporting documentation. AFG's instrument-related programs sit within a portfolio of 13 capital programs across deal sizes from $1M to $500M.

LC vs SBLC is not a technicality. It is the structural decision that determines whether the deal pencils.

Frequently Asked Questions

What is the difference between a letter of credit and a standby letter of credit?

A commercial letter of credit is a payment instrument — the issuing bank pays the seller when conforming documents are presented in the ordinary course of a transaction. A standby letter of credit is a guarantee instrument — it is drawn only if the applicant defaults on an underlying obligation. The first is designed to be drawn; the second is designed never to be drawn. They operate under different rule sets and serve different commercial purposes.

Which rules govern an SBLC versus a commercial LC?

Most commercial letters of credit are governed by UCP 600, the ICC framework for documentary credits. Most standby letters of credit are governed by ISP98, the ICC framework purpose-built for standbys. A standby can technically be issued under UCP 600, but ISP98 is generally the cleaner fit because its rules reflect how guarantee instruments are actually used over multi-year tenors.

Is an SBLC more expensive than a commercial LC?

Often yes, on a per-annum basis. SBLCs are priced like guarantees — reflecting the applicant's credit, the tenor (often 1 to 5 years), and the probability of draw. Commercial LCs are priced as transactional payment instruments and tend to be shorter dated. Both vary materially with corridor, issuing bank rating, and the obligation being supported. AltFunds Global compares cost to value unlocked on every structure.

Can the same bank issue both an LC and an SBLC?

Yes. Most major issuing banks offer both commercial letters of credit and standby letters of credit through their trade finance and structured products desks. The instrument is selected based on the commercial purpose. AltFunds Global structures work begins with the question of which instrument fits the deal, then moves to the question of which institution issues it.

When would I use an SBLC instead of an LC?

Use an SBLC when one party needs to back an obligation that may or may not be called — lease guarantees, performance guarantees, debt service reserves, advance payment guarantees, credit enhancement for senior facilities. Use a commercial LC when the parties are exchanging goods or services and the seller wants payment certainty against documents. The trigger conditions are opposite, which is why the wrong choice is expensive.

Are SBLCs commonly used in fraud schemes?

Unfortunately, yes — particularly in broker-driven markets where unregulated "providers" offer to deliver SBLCs without going through real issuing banks. AltFunds Global authored material on standbys and built the 99% Filter, a fraud-detection tool, specifically because fake SBLCs are a recurring problem. Legitimate SBLCs are issued by real, regulated banks via SWIFT — never by non-bank "asset desks" or "capital trust groups."

Where to Go Next

If you are evaluating a deal that involves alternative finance — as applicant, beneficiary, broker, or sponsor — start with a short conversation with the Capital Concierge. It asks a few questions about your situation and points you to the right structure, the right program, and the right next conversation. No commitment.

Qualify your deal or book a call.