A letter of credit is a written promise from a bank that a seller will be paid a specific amount, on a specific deadline, as long as the seller delivers the documents proving they met the agreed terms of the deal. In plain terms, the bank steps between a buyer and a seller who may not know or trust each other, and substitutes its own creditworthiness for the buyer's. If the buyer cannot or will not pay, the bank pays instead and then collects from its customer.
Because it converts one company's promise into a bank's obligation, a letter of credit is one of the oldest tools in commerce for closing deals between parties in different cities, states, or countries. It is most common in international trade, but US businesses also use it for large domestic orders, construction contracts, and lease or performance guarantees. This guide explains the mechanics, the parties, the real costs, the main types, and the faster financing alternatives many small businesses reach for instead.
Key takeaways
- A letter of credit is a bank's written promise to pay a seller once the seller presents documents proving the agreed terms were met.
- Banks deal in documents, not goods: payment turns on paperwork matching the terms exactly, a rule known as strict compliance.
- Most modern letters of credit are irrevocable, meaning no party can change them without everyone's consent.
- Standby letters of credit act as a backstop and only pay if the buyer defaults, unlike commercial letters that do the primary paying.
- Issuing-bank fees commonly run roughly 0.75% to 1.5% of the transaction value, before advising, confirmation, and discrepancy fees.
- Banks often require collateral or a frozen deposit, tying up cash that could otherwise fund operations.
- For working-capital needs rather than counterparty trust, revenue-based financing that underwrites on deposits and revenue is usually faster.
How a letter of credit actually works
A letter of credit does not replace the sales contract between a buyer and seller. It sits alongside it as a separate, independent payment mechanism governed by documents rather than by the goods themselves. The bank never inspects the shipment; it inspects the paperwork. If the documents match the terms written into the letter of credit exactly, the bank must pay. This is called the doctrine of strict compliance, and it is why letters of credit live or die on accurate paperwork.
Here is the typical sequence for a straightforward trade deal:
- The contract. Buyer and seller agree on price, goods, and terms, and agree that payment will be made by letter of credit.
- Application. The buyer asks its bank (the issuing bank) to open a letter of credit in the seller's favor.
- Issuance. The issuing bank drafts the letter of credit, listing exactly which documents the seller must present to get paid, and sends it to the seller's bank.
- Advising. The seller's bank (the advising bank) confirms the letter is genuine and passes it to the seller.
- Shipment. The seller ships the goods and gathers the required documents, such as a bill of lading, commercial invoice, packing list, and insurance certificate.
- Presentation. The seller submits those documents to its bank, which forwards them to the issuing bank.
- Examination and payment. The issuing bank checks the documents against the letter of credit. If they comply, it pays the seller and releases the documents to the buyer, who uses them to claim the goods.
The single most important idea to remember is that banks deal in documents, not in merchandise. A shipment can arrive damaged or short, and the seller can still be paid if the documents are technically correct. Disputes over the goods themselves are settled separately under the sales contract.
The parties involved
Lightweight explainers often mention only "the bank" and "the business." In practice a letter of credit can involve five or more distinct roles, and understanding them helps you read a quote or a contract accurately.
| Party | Role in the transaction |
|---|---|
| Applicant (buyer) | Requests the letter of credit and ultimately reimburses the issuing bank. |
| Beneficiary (seller) | Receives payment once compliant documents are presented. |
| Issuing bank | The buyer's bank; creates the letter of credit and carries the payment obligation. |
| Advising bank | The seller's bank; authenticates the letter and delivers it to the seller. |
| Confirming bank | Optional. Adds its own guarantee on top of the issuing bank's, protecting the seller if the issuing bank or its country fails to pay. |
| Negotiating bank | Examines documents and advances or pays funds to the seller, often the same institution as the advising or confirming bank. |
The confirming bank is worth extra attention. When a US seller ships to a buyer whose bank is in a country with political or currency risk, a confirmed letter of credit lets the seller rely on a bank it trusts at home rather than one it has never heard of abroad. That added safety is not free, which brings us to cost.
The main types of letters of credit
"Letter of credit" is an umbrella term. The right type depends on whether the instrument is meant to be the primary way of paying (a commercial letter of credit) or a backstop that is only drawn on if something goes wrong (a standby letter of credit). Choosing the wrong one can cost you fees or leave you exposed.
| Type | What it does | Common use |
|---|---|---|
| Commercial (documentary) | The primary payment method; the bank pays the seller directly on presentation of documents. | Importing and exporting goods. |
| Standby (SBLC) | A safety net; paid only if the buyer defaults on its obligation. Functions like a guarantee. | Construction contracts, leases, service agreements. |
| Irrevocable | Cannot be changed or canceled without every party's consent. The modern default. | Nearly all trade today. |
| Revocable | Can be altered or canceled by the issuing bank; now rare because it offers the seller little protection. | Largely obsolete. |
| Confirmed | A second bank adds its own payment guarantee. | Higher-risk countries or unknown issuing banks. |
| Revolving | Reinstates automatically so the same letter covers repeated shipments over time. | Ongoing supplier relationships. |
| Transferable | Lets the original beneficiary pass some or all of the credit to another party. | Middlemen and trading intermediaries. |
| Red clause | Allows the seller to draw an advance before shipping. | Sellers who need working capital to fulfill the order. |
Most modern letters of credit are irrevocable by default, because a revocable letter gives the seller almost no security. When someone says they need "an LC," clarify whether they mean a commercial letter that will do the paying or a standby letter that only pays if a deal falls apart.
What a letter of credit costs
Fees vary by bank, deal size, buyer creditworthiness, and country risk, but they stack up in predictable layers. As a rough guide, the issuing bank's own fee commonly runs somewhere in the range of about 0.75% to 1.5% of the transaction value, and that is only the headline number. The figures below are rounded illustrations, for example, on a $100,000 order, and not quotes.
| Fee (for example, on a $100,000 letter of credit) | Who charges it | Illustrative amount |
|---|---|---|
| Issuance fee (~1%) | Issuing bank | about $1,000 |
| Advising fee | Advising bank | about $150 to $300 flat |
| Confirmation fee (if confirmed) | Confirming bank | about $500 to $2,000, higher for risky countries |
| Amendment fee | Whichever bank makes the change | about $75 to $150 per change |
| Document examination fee | Negotiating bank | about $100 to $250 |
| Discrepancy fee | Issuing bank | about $75 to $150 per set of flawed documents |
Two costs surprise first-time users. The first is the discrepancy fee: if your documents contain even a small mismatch, such as a misspelled company name or a shipment date that is one day off, the bank can flag them and charge you to review the corrected set. Industry practitioners have long observed that a large share of first presentations are rejected on the initial pass for exactly these technicalities. The second is the cash cost: banks often require the applicant to post collateral or freeze a deposit, sometimes a percentage of the face value and sometimes the full amount, which ties up cash you could be using elsewhere.
Advantages and drawbacks
A letter of credit is powerful, but it is not free, fast, or simple. Weigh both sides before you commit.
| Advantages | Drawbacks |
|---|---|
| Substitutes a bank's credit for a buyer's, so sellers get paid even by unknown counterparties. | Fees and collateral requirements can tie up significant cash. |
| Reduces the risk of shipping goods to a distant or foreign buyer who might not pay. | Payment depends on flawless documents, not on the goods actually being right. |
| Gives buyers assurance that payment is released only when the seller meets the terms. | Setup can take days or weeks and involves multiple banks. |
| Widely recognized and governed by uniform international rules (UCP 600). | Not designed for small, fast, or recurring purchases. |
| Available in specialized forms for advances, repeat orders, and intermediaries. | Bank approval still depends on the applicant's own credit standing. |
The takeaway: a letter of credit is built for large, higher-stakes, arms-length deals. For everyday cash-flow gaps or fast supplier payments, the paperwork and locked-up collateral often outweigh the protection.
When a small business really needs one
Most US small businesses will go years without ever needing a letter of credit. It becomes genuinely useful in a handful of situations:
- Importing or exporting goods with a supplier or customer who will not extend open credit terms to a company they do not know.
- Winning a large contract, such as a construction or municipal project, where the other side demands a standby letter of credit as a performance guarantee.
- Signing a commercial lease where the landlord accepts a standby letter of credit in place of a large cash security deposit.
- Placing an unusually large one-time order where the seller wants assurance before committing production capacity.
Notice what is missing from that list: buying inventory you can pay for within weeks, covering payroll, funding a marketing push, or handling a slow season. Those are working-capital needs, and a letter of credit is the wrong tool for them. It is slow to arrange, it locks up collateral, and it pays a third party rather than putting cash in your account.
Faster alternatives for working capital
If your real goal is cash in the business rather than a guarantee to a supplier, several financing tools move faster and free up your money instead of freezing it.
- Business line of credit — draw and repay as needed; good for recurring gaps but usually requires stronger credit and time in business.
- Term loan or SBA loan — larger amounts at lower rates, but underwriting can take weeks and leans heavily on credit score and financials.
- Invoice financing — advances cash against unpaid invoices; useful if slow-paying customers are the bottleneck.
- Revenue-based financing through a marketplace — often the fastest path for a business that has steady deposits but an imperfect credit score.
That last option is worth understanding, because it underwrites differently from everything above. A revenue-based financing marketplace connects your business with funders who lean on your bank-deposit history and monthly revenue more than on your FICO score. Because approval turns on the cash actually flowing through your account, businesses with a FICO around 500 or higher can often qualify, with funding amounts starting near $10,000 and money frequently reaching the account within 24 to 48 hours of approval. It will not guarantee a supplier the way a letter of credit does, and approval is never guaranteed, but when the true problem is a cash-flow crunch rather than counterparty trust, it solves the real issue far faster and without tying up collateral.
Frequently asked questions
Is a letter of credit the same as a loan?
No. A loan puts borrowed money directly in your account. A letter of credit is a payment guarantee: the bank promises to pay a third party (your seller) on your behalf if certain document conditions are met, and you reimburse the bank. It provides trust between trading partners rather than working capital for your own business.
What is the difference between a commercial and a standby letter of credit?
A commercial letter of credit is the primary way payment is made; the bank pays the seller directly once documents are presented. A standby letter of credit is a safety net that is only drawn on if the buyer fails to meet its obligation, so it functions much more like a guarantee for contracts, leases, or performance commitments.
How long does it take to get a letter of credit?
Arranging one typically takes several days to a few weeks. The buyer applies, the issuing bank reviews the buyer's credit and may require collateral, the letter is drafted with precise document requirements, and it is transmitted through the seller's bank. This is why letters of credit suit planned, large transactions rather than urgent cash needs.
Who pays the fees on a letter of credit?
Fees are usually split by role. The buyer (applicant) generally pays the issuing bank's fee and any collateral cost, while the seller (beneficiary) often pays the advising, confirmation, and negotiation fees on their side. The exact split is negotiable and should be spelled out in the sales contract.
What happens if my documents have an error?
Under the strict compliance rule, even a minor mismatch, such as a misspelled name or a shipment date that is off by a day, lets the bank reject the presentation. You can usually correct and resubmit the documents, but the bank typically charges a discrepancy fee each time and payment is delayed until the paperwork is clean.
Do small businesses actually use letters of credit?
Sometimes, but not often. They matter most when importing or exporting with an unfamiliar partner, winning a large contract that requires a standby guarantee, or replacing a big cash lease deposit. For everyday inventory, payroll, or seasonal gaps, a letter of credit is the wrong tool because it is slow and locks up collateral.
What is a faster alternative if I just need cash flow?
If your real need is money in the business rather than a guarantee to a supplier, consider a line of credit, invoice financing, or revenue-based financing through a marketplace. Marketplace funders that underwrite on your bank deposits and monthly revenue can often approve businesses with a FICO around 500 or higher, starting near $10,000, with funds frequently arriving within 24 to 48 hours of approval, though approval is never guaranteed.
Are letters of credit governed by any standard rules?
Yes. Most international letters of credit follow the Uniform Customs and Practice for Documentary Credits, known as UCP 600, published by the International Chamber of Commerce. Standby letters may follow UCP 600 or a separate set of rules called ISP98. These frameworks give banks and businesses a common playbook for how documents are examined and payment is triggered.
