Letter of Credit vs Bank Guarantee: The Difference, and When You Need Which

The cleanest way to separate the two is by when each one pays. A letter of credit (LC) is a payment instrument — the bank pays the seller because the deal went right, once compliant shipping and commercial documents are presented. A bank guarantee (BG) is a default instrument — the bank pays the beneficiary because the deal went wrong, when the other party fails to perform or pay. An LC is the mechanism of a transaction that completes; a BG is the safety net for one that doesn’t. Treat them as interchangeable “non-fund-based limits” and you will buy the wrong instrument, price it wrong, and tie up the wrong part of your banking lines.

Both sit inside your non-fund-based (NFB) limit, both carry commission rather than interest, and both are negotiated as part of the same banking arrangement — which is exactly why getting the structure right matters. This guide draws the line precisely, sets out a decision table, and explains where the standby LC (SBLC) blurs the boundary. If you want the deeper mechanics of each, see our letter of credit and bank guarantee pages, both of which sit under our corporate finance and debt syndication practice.

Letter of credit: payment on compliant documents

An LC is the bank stepping in as a paymaster. The buyer’s bank (the issuing bank) undertakes to pay the seller a defined sum, provided the seller presents documents — bill of lading, invoice, insurance, certificate of origin and so on — that comply strictly with the LC’s terms. The bank deals in documents, not goods: if the paperwork conforms, the bank pays, regardless of any side dispute about the underlying shipment.

LCs are governed internationally by UCP 600 (the ICC’s Uniform Customs and Practice for Documentary Credits, Publication 600), which runs to 39 articles and gives a bank a maximum of five banking days after presentation to examine documents and decide to honour or refuse. LCs come in several flavours — sight (pays on presentation) versus usance (pays at a future date), inland versus foreign, and the standby LC discussed below. One India-specific point bears repeating: where there is a conflict, RBI and FEMA rules override UCP 600 — the contractual ICC framework does not displace Indian statutory and regulatory law.

Bank guarantee: payment on default

A BG runs the other way. The bank promises the beneficiary that if the applicant fails to perform an obligation — completing a contract, making a payment, honouring a tender — the bank will compensate the beneficiary up to the guaranteed amount. Nothing is paid while things go to plan. The BG is dormant unless and until default is invoked.

In India, BGs are governed by the RBI Master Circular on Guarantees and Co-acceptances, not UCP 600. RBI distinguishes a financial guarantee (guaranteeing a payment) from a performance guarantee (guaranteeing the quality or completion of work), and supervisory practice prefers financial guarantees while cautioning banks on performance guarantees, where the bank takes on judgement about technical performance it cannot easily assess. RBI also prohibits open-ended guarantees — every BG must carry a defined validity. Two periods matter and are routinely confused: the validity period (during which the underlying obligation runs) and the claim period (the window after validity within which the beneficiary may still lodge a claim). What you sign to backstop the bank is a counter-indemnity — your promise to reimburse the bank if it has to pay out. Commission is charged over the validity plus claim period, and the cash margin the bank requires is bank-policy and case-specific — there is no universal “50% margin” rule.

The decision table

Read across any row and the logic is consistent: the LC is the active instrument of a transaction that works; the BG is the contingent backstop for one that might not.

The SBLC bridge — where the line blurs

The standby letter of credit (SBLC) is the instrument that confuses everyone, because it is documentary in form but a guarantee in function. An SBLC is structured like an LC — it pays against documents — but those documents are typically a simple statement of the applicant’s default, so in economic substance it does the job of a guarantee. It exists largely because some jurisdictions historically restricted banks from issuing guarantees, so the LC mechanism was repurposed as a “standby.” An SBLC can be issued under UCP 600 or under ISP98 (the ICC’s International Standby Practices, written specifically for standbys). For an Indian corporate, an SBLC is most relevant in cross-border deals where a foreign counterparty wants a guarantee-like comfort in a familiar documentary wrapper. It does not erase the distinction — it bridges it: documentary plumbing, default-driven purpose.

Why the right instrument needs a banker who structures the file

Choosing between an LC, a BG and an SBLC — and then sizing the limit, setting the margin, fixing validity and claim periods, and negotiating commission — is not a form-filling exercise. It is structuring work, and it interacts with the rest of your fund-based and non-fund-based lines. A poorly drafted performance BG with an open claim window, or an LC with terms the seller can never satisfy, costs real money and real time.

That is the work we do at Finnova Advisory — CA-led and lender-agnostic, with ₹4,250 Cr+ mobilised across 100+ corporate-finance mandates since 2011, active across PSU banks, private banks, NBFCs and SEBI-registered AIFs. We structure the non-fund-based file, match it to the right-fit lender, and walk it through to issuance — the right instrument, on the right terms, walked through to the counter. If a tender, an import or an advance is forcing the question, our corporate finance team sets up the LC, BG or SBLC correctly the first time. Where a guarantee would otherwise lock up your bank’s non-fund limits, also weigh an insurance surety bond, which sits on par with a BG in government procurement under GFR 2022 without consuming bank lines.

Key takeaways

• An LC pays on compliant documents (the deal completes); a BG pays on default (the deal fails). They are not interchangeable.
• LCs are governed by UCP 600 (5 banking days to examine documents); BGs by the RBI Master Circular on Guarantees — and RBI/FEMA override UCP 600 on conflict.
• An LC protects the seller; a BG protects the beneficiary (buyer, employer or authority).
• Distinguish a BG’s validity period from its claim period, and know that margin is case-specific, not a fixed 50%.
• The SBLC is documentary in form but a guarantee in function — the bridge between the two.

FAQ

What is the main difference between a letter of credit and a bank guarantee? Timing of payment. A letter of credit is a payment instrument — the bank pays the seller when compliant documents are presented and the transaction completes. A bank guarantee is a default instrument — the bank pays the beneficiary only if the applicant fails to perform or pay. An LC anticipates a successful deal; a BG backstops a failed one.

Which is safer for an exporter, an LC or a BG? For an exporter wanting assurance of payment on shipment, a confirmed letter of credit is the right tool — it pays on presentation of compliant documents within five banking days under UCP 600. A bank guarantee protects the beneficiary against default and is not the natural instrument for assuring routine sale proceeds.

What law governs an LC and a BG in India? Letters of credit follow UCP 600 (ICC Publication 600) internationally, but RBI and FEMA rules override UCP 600 where they conflict. Bank guarantees are governed by the RBI Master Circular on Guarantees and Co-acceptances, which distinguishes financial from performance guarantees and prohibits open-ended guarantees.

Is an SBLC a letter of credit or a bank guarantee? A standby letter of credit (SBLC) is documentary in form — it pays against documents like an LC — but functions like a guarantee, since those documents are usually a statement of default. It can be issued under UCP 600 or ISP98 and is common in cross-border deals where a counterparty wants guarantee-like comfort in a documentary wrapper.

What margin does a bank charge for a bank guarantee? There is no universal margin. The cash margin a bank requires against a BG is bank-policy and case-specific, depending on the applicant’s credit profile, the guarantee type and the counterparty. Avoid any blanket assumption such as a fixed 50% — it is negotiated as part of the overall non-fund-based limit.

Can a surety bond replace a bank guarantee? In many government and infrastructure contracts, yes. Under GFR 2022, insurance surety bonds (regulated under the IRDAI Surety Insurance Contracts Guidelines, 2022) are placed on par with bank guarantees in government procurement, and crucially a surety bond is an insurance contract that does not consume your bank’s non-fund-based limits — which is its central advantage over a BG.