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Bank guarantee vs letter of credit: the short answer
When big money and limited trust meet in a business deal, two instruments keep it safe: the bank guarantee and the letter of credit. They sound similar and both put a bank's credibility behind a transaction, but they trigger in opposite situations, and picking the wrong one can leave you exposed.
The short version: a
bank guarantee pays out only if something goes wrong (the applicant defaults), while a
letter of credit pays out when something goes right (the seller delivers and presents the required documents). A guarantee is a safety net; a letter of credit is a payment mechanism. The rest of this guide unpacks how each works and when to use it.
What is a bank guarantee?
A bank guarantee is a bank's commitment to cover a debtor's financial obligations if they fail to meet them. It is a security net that lets contracts proceed even in high-risk sectors like construction and real estate.
- Purpose: to minimise financial risk in a contract. In a large construction project, a bank guarantee means that if the contractor defaults, the client still receives the agreed compensation.
- Usage: common wherever trust and timely execution are critical, such as real estate and infrastructure. Bank guarantees come in several forms, including performance, advance payment, financial, bid bond, shipping, and loan guarantees, each covering a different obligation.
For a full breakdown of how bank guarantees work and their types, see our [guide to bank guarantees](/blog/bank-guarantee-guide).
What is a letter of credit?
A letter of credit is a bank's promise to pay a seller once specific conditions are met. It is central to international trade, where buyers and sellers operate across borders and often have no established trust.
- Purpose: to guarantee payment to the seller as long as the contract conditions are satisfied, which creates confidence on both sides of a cross-border deal.
- Usage: widely used in international trade to ensure the seller is paid once they fulfil their delivery and documentary obligations.
Types of letters of credit
Letters of credit come in several forms, each suited to a different trade situation:
- Irrevocable letter of credit. A firm, non-cancellable commitment that cannot be changed without all parties' consent. Example: a buyer guarantees payment to an overseas supplier, with funds released once goods ship.
- Confirmed letter of credit. A second bank adds its own guarantee on top of the issuing bank's. Example: an exporter wants extra assurance of payment even if the buyer's bank defaults.
- Import letter of credit. Secures short-term funding for an importer to buy goods. Example: an importer funds a purchase of electronics for resale.
- Export letter of credit. Ensures the exporter is paid once delivery terms are met. Example: a textile exporter ships and is paid on proof of shipment.
- Revolving letter of credit. Covers multiple transactions over a set period under one agreement. Example: a business trading regularly with a supplier avoids issuing a new LC for each order.
Key differences compared
Both instruments provide financial security through a bank, but they differ on the points that matter most:
| Criteria | Bank guarantee | Letter of credit |
|---|
| Definition | Provides compensation if the applicant defaults | Ensures payment when specified conditions are met |
| Primary use | Construction, real estate, domestic contracts | International trade |
| Payment trigger | Activated by default (failure to perform or pay) | Activated by performance (seller meets terms and submits documents) |
| Risk exposure | The customer carries more risk; the bank steps in only on default | The bank assumes more risk, since it guarantees payment |
| Parties involved | Usually three: bank, applicant, beneficiary | Up to five, including issuing bank, confirming bank, and intermediaries |
The single clearest way to remember it: a bank guarantee pays *if the deal fails*, a letter of credit pays *when the deal succeeds*.
How banks issue them
Before issuing either instrument, a bank runs a careful evaluation to protect both itself and the applicant. The process generally involves:
- Verifying business and financial details. The bank reviews company information and financial statements to confirm the applicant can meet the obligation.
- Evaluating the risk. It assesses the risks in the transaction and decides whether, and how, to proceed.
- Setting liability limits. It caps how much it will be liable for on a default, keeping its exposure manageable, and often requires collateral or a margin.
- Committing to a payable amount. Once checks are done, the bank commits to paying a defined amount if the applicant defaults (guarantee) or if the LC conditions are met (letter of credit).
This due diligence is exactly why the instruments carry weight: the beneficiary is relying on the bank's assessment and balance sheet, not just the counterparty's word.
Which one should you choose?
The choice comes down to what you are protecting against:
- Choose a bank guarantee when you need a safety net against non-performance or default, typically in construction, infrastructure, supplier, or lease contracts, and often domestically.
- Choose a letter of credit when you need to guarantee payment on delivery in a trade deal, especially international trade where buyer and seller lack established trust.
In practice, many exporters encounter letters of credit far more often, since they are the workhorse of cross-border trade payment. For how LCs fit alongside other export payment methods, see our guide on [export payment terms](/blog/export-payment-terms).
