The Question
Both a letter of credit (LC) and a bank guarantee (BG) are non-fund-based facilities — the bank isn't lending money upfront, it's lending its credibility to a transaction. That similarity is exactly why the two get confused. But an LC and a BG protect against fundamentally different failures, and a bank that issues one will not accept it as satisfying a requirement that actually calls for the other.
Getting this wrong isn't just a paperwork problem. Non-fund-based limits sit within the same overall working capital sanction as fund-based facilities like cash credit, so using the wrong instrument — or using more of one than a transaction actually needs — eats into headroom the business may need elsewhere.
What Each Instrument Is Actually Protecting Against
The distinction is about which side of the transaction is being protected, and against what kind of failure.
- Letter of Credit: A payment assurance mechanism. The issuing bank undertakes to pay the seller, provided the seller presents documents that comply exactly with the LC's terms — regardless of whether the buyer is willing or able to pay at that point. It is a primary payment obligation, not a fallback.
- Bank Guarantee: A performance and default safeguard. The bank pays only if the party being guaranteed — a contractor, a bidder, a supplier — fails to fulfil its contractual obligation and the beneficiary invokes the guarantee. It is a contingent obligation, triggered by failure, not a routine payment mechanism.
What Actually Determines Which Instrument a Transaction Needs
- What kind of risk is actually being covered. If the concern is whether the buyer will pay, the instrument is an LC. If the concern is whether the seller or contractor will perform, the instrument is a BG. Confusing the two means asking a bank to underwrite a risk it never agreed to take.
- Domestic tenders, EPC and construction contracts almost always call for a BG — bid bonds, performance bonds and retention-money guarantees are standard in government and large private tenders, not LCs.
- Trade with a new or overseas counterparty typically needs an LC to bridge the trust gap between two parties who haven't built a payment track record with each other yet.
- Margin money requirements differ meaningfully. Banks are often more comfortable with lower cash margin on an LC, since it is usually self-liquidating against actual sale proceeds. A BG can sit as a contingent liability for years without ever being invoked, which shapes how a bank margins it.
- Sight versus usance LC changes the buyer's own working capital cycle — a sight LC requires payment on document presentation, while a usance LC defers payment, effectively extending the buyer's credit period.
- BG tenor commonly runs the full contract or warranty period — sometimes three to five years for a defect liability period on a construction contract — tying up sanctioned limits far longer than a typical trade LC, which usually closes once goods are delivered and paid for.
- Both draw from the same overall non-fund-based sanction. Heavy utilisation of BGs for long-tenor contracts reduces the headroom available for LCs on trade transactions, and vice versa — a business running both needs to plan its combined non-fund-based limit, not just each instrument separately.
Questions Worth Asking
Is the actual risk in this transaction about payment, or about performance?
Does the counterparty's own procurement process specify which instrument it requires?
How long will the guarantee or credit need to stay live, and what does that mean for available limits?
What margin money will the bank require for this specific instrument and tenor?
Is a sight or usance structure more appropriate given the buyer's own cash flow cycle?
How much of the overall non-fund-based sanction is already committed to other instruments?
What documentation does the LC require, and can the business reliably produce fully compliant documents each time?
Non-fund-based instruments are frequently treated as a formality to arrange rather than a limit to plan around — until a long-tenor guarantee quietly consumes the headroom a business needed for its next trade transaction. Structuring this correctly, alongside anchor-led supply chain and trade finance facilities, is where non-fund-based limits actually get sized to match how the business trades and tenders.
Key Takeaways
- A letter of credit is a primary payment assurance mechanism; a bank guarantee is a contingent performance safeguard triggered only on default.
- Domestic tenders and construction contracts typically require a bank guarantee, not a letter of credit.
- Trade with new or overseas counterparties typically requires a letter of credit to bridge the trust gap.
- Bank guarantees often run far longer than letters of credit, tying up sanctioned limits for years rather than months.
- Both instruments draw from the same overall non-fund-based sanction, so heavy use of one reduces headroom for the other.
- Margin money requirements differ by instrument and tenor, not by a single fixed rule.
Closing Perspective
A letter of credit and a bank guarantee are sometimes discussed as if either would do, when the honest starting point is asking what specific failure the transaction needs to be protected against. A tender needs assurance that the bidder will perform; a cross-border shipment needs assurance that payment will actually happen. Matching the instrument to the risk — and planning the combined limit these instruments draw from — is what keeps a business from running short of non-fund-based capacity exactly when it needs it most.