What Is a Letter of Credit? Explained for Business

A letter of credit sounds like something only giant exporters and ocean freighters need. Then a supplier in another country asks for one before shipping, a landlord wants a standby letter of credit instead of a huge cash deposit, or a bank officer mentions an LC sublimit on your revolving line. Suddenly the phrase is on your desk. A letter of credit is a bank's conditional promise to pay a named party when agreed documents show up in the right form. It is not a personal guarantee from the owner. It is not a regular business loan that funds your payroll. It sits in the middle of trade and performance risk, swapping the buyer's credit story for the bank's. This guide explains what a letter of credit is, how commercial and standby letters differ, who the parties are, how payment actually flows, what fees and collateral look like in practice, when small businesses meet these instruments, and how they differ from personal guarantees and ordinary loans.

Nothing here is personalized legal, credit, or banking advice. Banks, courts, and trade contracts control the fine print. Treat the examples as education you can take to your banker, freight forwarder, or counsel before you sign.

What a Letter of Credit Is in Plain English

At its core, a letter of credit (often shortened to LC or L/C, and also called a documentary credit in trade materials) is a written undertaking from a bank. The bank promises to pay a beneficiary up to a stated amount if the beneficiary presents documents that match the credit's terms. Payment depends on documents, not on whether the goods were perfect or the parties later argue about quality. That documentary focus is why banks and exporters care so much about invoices, bills of lading, packing lists, inspection certificates, and exact wording.

The U.S. Commercial Service describes a letter of credit as a contractual commitment by the foreign buyer's bank to pay once the exporter ships and presents the required documentation as proof. Trade educators at the International Trade Administration emphasize the same idea: the issuing bank commits on behalf of the importer that payment will be made to the exporter when the stated terms and conditions are met, as verified through the documents.

Think of three linked relationships, not one messy handshake:

• The underlying sales or performance contract between buyer and seller (or landlord and tenant, owner and contractor).
• The reimbursement agreement between the applicant (the bank's customer who asked for the LC) and the issuing bank.
• The bank's independent undertaking to the beneficiary, which is usually governed by letter-of-credit practice rules such as the International Chamber of Commerce's Uniform Customs and Practice for Documentary Credits (UCP 600) when the credit says so.

Because the bank's promise is documentary, a seller who ships correctly and presents complying papers can get paid even if the buyer later becomes difficult. A buyer who drafts careful document requirements can avoid paying against a bare promise with no shipping evidence. Both sides still need clean paperwork. Discrepancies are common and can delay or block payment until amendments or waivers clear them.

Commercial Letters of Credit vs Standby Letters of Credit

People say "letter of credit" as if there were only one flavor. In U.S. banking and trade practice, two families matter most for ordinary businesses.

Commercial (documentary) letters of credit are the classic trade payment tool. They are designed so that payment is expected to happen when the seller presents complying shipping and commercial documents. The Federal Reserve's commercial bank examination materials describe a commercial documentary letter of credit as a letter from a bank on behalf of a buyer authorizing a seller to draw drafts up to a stipulated amount under specified terms, with payment when those terms are met and required documents are submitted. Sight credits pay promptly after a complying presentation. Usance or deferred credits pay at a later date stated in the credit. Most modern commercial credits are irrevocable, meaning they cannot be changed or canceled without the parties' agreement once issued in favor of the beneficiary.

Standby letters of credit work more like a safety net than a routine payment pipe. The beneficiary usually presents a demand (and any required certificates) only if the applicant fails to perform or fails to pay under the underlying deal. If everything goes well, the standby may expire unused. Construction bid bonds, performance support, lease security in place of a large cash deposit, and backup for other obligations often use standbys. Regulators and examiners treat financial standbys (backing money obligations) and performance standbys (backing nonfinancial performance) as related but distinct guarantee-style exposures for banks.

A short contrast helps:

• Commercial LC: documents prove a shipment or delivery happened; payment is the normal path.
• Standby LC: documents prove a default or claim event; payment is the backup path.

Confirmed credits add another bank's undertaking, usually in the seller's country, so the beneficiary can look to a local bank as well as the foreign issuer. Confirmation raises cost and is often requested when the seller is unsure about the issuing bank or the country risk behind it.

The Parties: Applicant, Beneficiary, Issuing Bank, Advising Bank

Every educational diagram of an LC starts with the same cast. Memorize the roles and the rest of the paperwork gets easier.

Applicant (account party). The customer who asks the bank to issue the credit. In a goods trade, this is usually the importer or buyer. The applicant signs a reimbursement agreement, may pledge collateral or cash, and remains responsible for reimbursing the bank if the bank pays under the credit.

Beneficiary. The party who can present documents and claim payment under the credit. In a commercial goods deal, this is usually the exporter or seller. Under a standby, the beneficiary might be a landlord, project owner, or supplier waiting for a default trigger.

Issuing bank (opening bank). The bank that issues the credit on the applicant's instructions. It is obligated to honor a complying presentation according to the credit's terms. Issuers are often in the buyer's country for import LCs.

Advising bank. A bank, often in the seller's country, that authenticates and forwards the credit to the beneficiary. Advising does not by itself mean the advising bank must pay. It mainly reduces fraud risk by confirming the credit looks genuine.

Confirming bank (when used). A bank that adds its own independent undertaking to pay or negotiate against complying documents, giving the beneficiary a second bank to look to.

Nominated or negotiating bank. A bank authorized in the credit to examine documents and, depending on the credit wording, to pay, accept, or negotiate. Roles can overlap. One bank may advise and later examine documents. Another bank may confirm.

For a small U.S. exporter, the practical sequence often looks like this: foreign buyer applies at its bank; that issuing bank transmits the credit; your bank advises it to you; you ship and assemble documents with your freight forwarder; your bank checks the documents; compliant papers move to the issuer; payment flows back through the banking chain; the issuer debits the buyer and releases documents so the buyer can claim the goods.

How Payment Works, Step by Step

Trade.gov's letter-of-credit overview walks through a standard flow that matches what most exporters learn in practice:

1. Exporter and importer agree on a sales contract that calls for payment by letter of credit, including the document list and latest shipment dates.
2. Importer applies to its bank to open a letter of credit in favor of the exporter.
3. Issuing bank drafts the credit from those terms and transmits it to the exporter's bank.
4. Exporter's bank reviews and advises the credit to the exporter.
5. Exporter ships as the credit requires and presents the stipulated documents to its bank.
6. Exporter's bank checks for compliance. Errors and discrepancies must be fixed, amended, or waived.
7. Complying documents go to the issuing bank. The issuer pays or reimburses according to the credit (sight or usance).
8. Importer's account is debited (or financing is arranged), and documents are released so the importer can clear and claim the goods.

Two ideas trip people up. First, banks examine documents against the credit, not the physical cargo quality. A perfect shipment with a wrong bill of lading description can still be discrepant. Second, amendments require agreement under irrevocable credits. If a shipment will miss a latest date, fix the credit before you present documents you already know will fail.

Federal Reserve research notes that letters of credit still matter for U.S. trade even as volumes concentrate in larger banks. Call report data highlighted in a 2026 FEDS Note showed outstanding commercial letters of credit around $15 billion for U.S. call reporters as of late 2024, with most banks reporting zero commercial LC balances. That concentration is why a community business may need a relationship bank with a real trade desk, a correspondent, or an export-finance partner rather than a pure retail branch.

Fees, Collateral, and What "Expensive" Usually Means

Letters of credit are often described as secure and labor-intensive. The International Trade Administration's Trade Finance Guide frames them as relatively expensive in transaction costs compared with open account. Exact pricing is bank-specific and deal-specific. Educational ranges you will hear in trade circles often include issuance fees as a percentage of the face amount (sometimes quoted annually for longer tenors), plus advising fees, amendment fees, discrepancy fees, confirmation fees, and courier or SWIFT charges. Confirmation pricing rises when the issuing bank or country risk looks weaker.

Illustrative math only: if a bank quotes an issuance fee of 1.00% of a $200,000 commercial LC for the tenor involved, that fee layer alone is $2,000 before advising, amendments, or confirmation. A second amendment that costs a few hundred dollars each time adds up when documents are sloppy. None of those figures is a national schedule. Ask your bank for a written fee letter on the facility you actually want.

Collateral is the other cost. Banks treat LCs as credit exposures. The applicant may need cash collateral, a pledge of deposits, a lien on inventory or receivables, a reduction of revolving availability, or a personal guaranty from owners in addition to the corporate reimbursement obligation. A standby used as lease security may require near-dollar-for-dollar cash at a thin-credit company, which can feel like parking a deposit at the bank instead of with the landlord. A stronger borrower with a solid borrowing base may get unsecured or lightly secured LC capacity inside a broader credit agreement.

Cash you set aside for collateral or for the working capital gap while goods are in transit still needs a home. Many firms keep that buffer in a high-yield savings account at an insured bank while they negotiate facility terms, rather than leaving large idle balances in a noninterest operating account. Use the interactive projection below to see how monthly saving and yield change the time needed to build a target cash reserve for collateral, fees, or export working capital.

When Small Businesses Actually Encounter Letters of Credit

You do not need a Fortune 500 treasury team to meet an LC. Common small-business moments include:

• First export sale to a new overseas buyer. The buyer wants time to pay after shipment. You want bank-backed payment certainty instead of pure open account.
• Importing goods where the foreign seller insists on an LC. Your bank issues; you become the applicant; your cash or line capacity supports the credit.
• Commercial leases. Some landlords accept a standby letter of credit in place of a large security deposit so the landlord can draw if rent is unpaid.
• Construction and project work. Bid, performance, or payment support may take standby form.
• Supplier relationships with weak credit files. A standby or commercial credit can unlock inventory you could not buy on open terms.

U.S. export agencies and the Small Business Administration also discuss working-capital programs that can support export orders and, in some structures, standby letters of credit used as bid or performance bonds. Those programs do not replace a bank relationship. They can make a lender more willing to extend trade capacity when eligibility fits.

Before you chase an LC, check whether a simpler tool works. Cash in advance protects the seller but can lose the sale. Open account wins buyers in competitive markets but shifts nonpayment risk to the seller. Documentary collections sit between open account and LCs: banks move documents against payment or acceptance, without the same bank payment undertaking as a credit. Export credit insurance can cover nonpayment risk on open-account sales for eligible exporters. The Trade Finance Guide walks through those choices side by side so you pick the instrument that matches relationship risk, not the one that sounds most formal.

Credit Readiness: What Banks Look at Before They Issue

An LC is a credit product. The issuing bank underwrites the applicant. Expect questions about financial statements, cash flow, borrowing base, existing loan covenants, country and bank risk on the other side of the trade, commodity or goods type, and document complexity. Owners of closely held companies often see personal guaranty requests even when the LC is in the company's name. That guaranty is separate from the letter of credit itself. The LC is the bank's undertaking to the beneficiary. The guaranty is the owner's backup promise to the bank.

Business and personal credit files still matter in that underwriting conversation. Late payments, thin trade references, high utilization on cards and lines, or messy personal guarantees elsewhere can shrink LC appetite or push the bank toward cash collateral. Before you ask a lender for trade capacity, it helps to see your credit picture in one place, including scores, utilization, and alerts. A tool such as WalletHub Premium is one way some owners monitor that household and personal credit layer while they clean up revolving balances and prepare bank packages. Stronger personal and business credit stories do not invent an LC product your bank does not offer, but they can change collateral and pricing on the facilities you do qualify for.

Letter of Credit vs Personal Guarantee vs Loan

These three get mixed together in casual conversation. They are different tools.

Letter of credit. A bank's documentary undertaking to a beneficiary. The beneficiary looks to the bank under the credit's terms. The applicant must reimburse the bank and may post collateral. Commercial LCs often move payment for goods. Standbys often stand behind performance or payment defaults.

Personal guarantee. A promise by an individual (often an owner) to pay the lender or counterparty if the business does not. Guarantees are common on small-business loans, leases, and sometimes on the reimbursement side of LC facilities. A guarantee does not by itself pay a foreign seller against shipping documents. It mainly strengthens the creditor's claim against the guarantor.

Business loan or line of credit. Funds advanced to the borrower for working capital, equipment, or other purposes, with interest and repayment terms. A revolving line may include an LC sublimit so issued credits reduce availability even before a draw. Paying under an LC can turn the bank's contingent exposure into a loan balance you then owe. That is still different from using the LC as the settlement instrument with your overseas counterparty.

Example: Nora's company imports components. The overseas mill will not ship on open account. Nora's bank issues a $150,000 commercial LC. The mill ships, presents complying documents, and gets paid through the banks. Nora's company reimburses its bank. Separately, Nora signed a personal guaranty on the company's credit agreement. If the company cannot reimburse the bank after a draw, the bank can pursue the company and, under that guaranty, Nora. The foreign mill was paid because of the LC, not because Nora personally wired the mill.

Another example: a landlord wants six months of rent as security. Instead of wiring cash to the landlord, the tenant's bank issues a standby LC for that amount naming the landlord as beneficiary. If rent defaults and the standby's draw conditions are met, the landlord can demand payment from the bank. If the tenant performs, the standby may expire undrawn. The tenant may still have cash collateral at the bank behind the standby. The instrument changed who holds the cash and who can demand payment, not whether credit support exists.

Documents, Discrepancies, and Operational Reality

Most LC pain is operational. Credits list exact documents, latest shipment dates, ports, Incoterms references, insurance amounts, and whether partial shipments or transshipments are allowed. A single mismatched number on a commercial invoice can create a discrepancy. Banks may refuse to honor until the applicant waives the discrepancy or an amendment cures it. Freight forwarders and experienced trade clerks earn their fees here.

Practical habits that reduce drama:

• Have your bank or advisor review a draft of the LC before it is issued in final form.
• Match the credit to the sales contract. Do not assume the contract wins if the credit says something else.
• Build document checklists the day the credit is advised, not the day the vessel sails.
• Budget time for amendments when production or shipping slips.
• Know whether you need confirmation before you rely on a distant issuing bank.

Fraud awareness matters too. Beneficiaries should work through advising banks they trust rather than relying on unverified PDF "credits" emailed from strangers. Applicants should understand that once a complying presentation is honored, fighting with the seller about goods quality generally moves to the sales contract and local remedies, not to a simple recall of the bank payment.

How LCs Fit With Broader Banking and Deposit Safety

A letter of credit is not deposit insurance. FDIC insurance protects qualifying deposits at insured banks up to applicable limits. It does not guarantee that your customer will pay you, and it does not replace an LC. Separately, when you post cash collateral for an LC, that cash is usually still a deposit on the bank's books (subject to the account terms and any security interest). Confirm titling, control agreements, and insurance coverage if balances are large. Keep operating cash, tax reserves, and collateral pots labeled clearly so a busy month does not mix them.

From the banking system's view, commercial and standby letters of credit are off-balance-sheet credit exposures until drawn. Examiners care about documentation quality, customer credit, country risk, and how LC lines interact with other loans. That is why a clean package and a realistic collateral plan often matter as much as the trade story itself.

A Practical Checklist Before You Ask for an LC

1. Decide whether you need a commercial payment LC, a standby backup, or a different tool such as open account plus insurance.
2. Write down the face amount, tenor, currency, and who the beneficiary will be.
3. List the documents you can actually produce on time.
4. Ask your bank whether it issues or advises LCs directly or through correspondents, and request a fee and collateral outline in writing.
5. Check covenants on existing loans so a new LC does not breach a negative pledge or sublimit rule by surprise.
6. Prepare financials and a short trade narrative for underwriting.
7. Review personal and business credit hygiene if owners will guarantee or if utilization is high.
8. Align your freight forwarder and bookkeeper on document timing before the first shipment.

If your bank cannot help, ask about introductions to a trade-capable correspondent, an export finance specialist, or public programs that support export working capital for eligible firms. Waiting until a container is booked to learn that nobody on your team has issued an LC before is an expensive way to learn trade finance.

The Bottom Line

A letter of credit is a bank's conditional, usually documentary, promise to pay a beneficiary when the credit's terms are met. Commercial letters of credit are built to pay against shipping and commercial documents in trade. Standby letters of credit are built to pay when a default or claim is properly presented. The applicant asks the bank to issue; the beneficiary presents; the issuing bank undertakes; advising and confirming banks help authenticity and local comfort. Fees, collateral, and paperwork are real costs. An LC is not a personal guarantee and not the same thing as a working-capital loan, even though loans, guarantees, and LC sublimits often sit in the same credit agreement.

If a counterparty asks for an LC, slow down long enough to name the type, the documents, the bank path, and the cash impact. If you are the one demanding an LC, make sure the credit terms match the commercial deal you actually need. Used well, letters of credit let strangers across borders trade with more confidence. Used casually, they create discrepancy loops, frozen collateral, and surprise fees. The instrument is powerful precisely because a bank, not just a promise, stands in the middle.