Bank Guarantees and Letters of Credit

A bank guarantee and a letter of credit are both a bank stepping in with its own promise to pay — and both quietly consume the same credit lines you rely on for funding. A letter of credit pays a seller when compliant documents are presented; a guarantee pays a beneficiary only if the party it backs fails to perform. Different triggers, same underlying fact: your bank is lending you its creditworthiness, it charges for it, and it books the exposure against your facilities. Miss that second half and the guarantee book becomes where facility capacity silently leaks.

The problem they solve

Two parties who don't know each other have to transact — often across borders, different legal systems, no shared history. The seller doesn't want to ship before it's confident of payment; the buyer doesn't want to pay before it's confident of delivery. Each side's assurance is only as good as the other's balance sheet and honesty, neither of which is visible from the far side of a border.

A bank bridges that gap. Both parties may not trust each other, but they can both trust a reputable bank. So one side's bank inserts its own promise into the deal, and the trust problem becomes a banking problem — which is exactly the kind of problem banks are set up to price and carry. That's the whole idea behind both instruments; they just insert the promise at different points.

Letter of credit: documents, not goods

A letter of credit — a documentary credit — is a payment instrument. The buyer's bank undertakes to pay the seller when the seller presents documents that comply with the terms set out in the credit: the invoice, the transport document, the certificates, whatever the credit specifies. Get the documents right and payment is due; the bank checks the paperwork, not the shipment.

That's the principle people trip over. The bank deals in documents, not in goods. It is not inspecting the container or verifying that what shipped matches what was ordered — it's examining whether the presentation matches the credit. Compliant documents mean the bank pays, even if a dispute over the goods is brewing; non-compliant documents mean the bank can refuse, even if the goods are perfect. It's abstract on purpose: it lets a bank stand behind a trade it has no way to physically verify. Letters of credit are heavily used in international trade for exactly this reason — they turn "do I trust this counterparty across an ocean?" into "can they produce the right documents?"

Bank guarantee and standby LC: the safety net

A bank guarantee runs the other way. Here the bank pays the beneficiary only if the party it's backing fails — a demand or a declaration of default triggers it. It's not the intended payment route; it's the backstop that everyone hopes stays untouched. A performance guarantee assures a buyer the supplier will deliver as contracted. An advance-payment guarantee protects a buyer who paid up front, so the money comes back if nothing is delivered. A bid bond assures a tender's issuer the bidder will honour its bid. In every case the guarantee pays out only when the primary obligation isn't met.

A standby letter of credit does the same job dressed in documentary-credit clothing: it looks like an LC and is presented against documents, but its purpose is a guarantee's — it pays only if the underlying party defaults. If a documentary LC is the road payment is expected to travel, a standby or a guarantee is the airbag: valuable precisely because it usually never deploys.

There are internationally recognised rule frameworks governing both families — established practice rules for documentary credits, and separate ones for demand guarantees — that standardise how these instruments are read and honoured across jurisdictions. You don't need the article numbers to work with treasury; you need to know the rules exist, that which set applies is a choice made when the instrument is drafted, and that the wording is where the risk lives.

The treasury angle people forget

Here's the part that gets lost between the trade desk and the treasury team: every guarantee and every LC consumes your bank credit lines. When a bank issues one, it's taking on a contingent liability on your behalf — a promise it may have to fund — and it books that against your facilities, the same facilities you're counting as liquidity headroom. It charges fees for the privilege, running for as long as the instrument stays open.

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A guarantee you issued and forgot is a live claim on your credit lines. It doesn't show up as drawn debt, so nobody misses the cash — but the capacity is gone, quietly, until someone cancels it.

So a portfolio of open guarantees is not free. It ties up facility capacity that could have funded a drawdown, a working-capital swing, an acquisition. I have walked into treasuries that could not explain why their available lines were thinner than their debt suggested — and the answer was always the same: a guarantee book nobody had reconciled in years. This is why the bank relationship conversation has to include contingent lines, not just cash facilities. Guarantees are consumption of the same scarce resource that funds working capital.

Governance, and the trap

The trap is that guarantees outlive the contracts they backed. A performance guarantee for a project completed two years ago should have been released the day the project signed off — but releases require the beneficiary to act, or someone on your side to chase it, and in practice nobody does. So it keeps consuming lines and accruing fees, year after year, backing an obligation that no longer exists.

The other edge is the wording. An on-demand guarantee, by design, pays when the beneficiary demands it — and it can be called on a technicality, or when a project sours and a counterparty reaches for whatever cash it can. The line between "pays on genuine default" and "pays on any demand" is written into the text, which is why the drafting is a treasury matter and not a formality to rubber-stamp.

Docs-vs-reality: the manuals describe these as clean, self-liquidating instruments. In practice the guarantee book is where capacity leaks — old guarantees nobody cancelled, and a "standby" that gets called the moment a project goes wrong. Treat it as a live portfolio: every open instrument owned, dated, tied to a live obligation, with expiry discipline enforced. Track it the way you'd track drawn debt, because in the ways that matter — liquidity risk and facility capacity — it behaves like drawn debt. Issue and forget is how a treasury ends up funding trust it stopped needing years ago.

Part of the Cash & Liquidity Management guide. See also corporate funding and credit facilities and liquidity risk management. The newsletter sends one finance-systems pattern every two weeks.