What is a bank guarantee letter and how do you get one?
A bank guarantee buys trust without spending cash. Here are the parties, the types, the bank's process, commission logic, calls and the release step.
You downloaded the tender documents, worked the costing, assembled the bid file page by page. Then one line in the final annex: "A bid guarantee must be submitted with the offer." Everything up to that line was work you knew how to do. Now your bank steps into the deal, and another institution has to promise something on your behalf before you can bid.
A bank guarantee letter is, at heart, a one-sentence promise: "If this company fails to deliver, I will pay." What follows covers the parties, the types, how banks decide, the commission logic, what happens when a guarantee is called, and how release works.
What a bank guarantee letter actually is
A bank guarantee letter is a written payment undertaking a bank gives to a third party on behalf of its customer. If the customer fails to perform, deliver, or pay, the holder claims the stated amount from the bank. It is not a payment instrument but a security instrument: the point is not to move money, but to make a promise serious enough that nobody ever has to.
Three parties are involved. The applicant asks its bank to issue the letter — you, the contractor or buyer. The beneficiary is the party it is addressed to: the awarding authority, the main contractor, the supplier. The issuing bank is the guarantor that writes it and carries the obligation.
Here is what surprises people: the bank never judges whether you did the work. It reads the text and applies exactly what it says, so in a dispute the literal wording governs, not the spirit of the contract behind it.
Why a guarantee instead of a cash deposit
Most tender documents say "cash or a bank guarantee." Both are accepted, but their effect on your business runs in opposite directions. With a cash deposit, the money leaves your account and sits in someone else's until the job closes — buying no materials, paying no salaries.
With a guarantee, no cash leaves the till. Your bank commits on your behalf, you pay a commission, and part of your credit limit is set aside. Working capital stays in the field — a distinction that shapes how fast you can grow, which is why we treat it at length in our guide to working capital management.
None of which makes it free. You are not tying up cash, but you are tying up a credit limit, and limits are finite. The same logic governs factoring, part of the same risk relationship your bank holds on you. A guarantee does not remove the cost; it relocates it.
The main types and when each is demanded
Bid guarantee
Requested when you enter a tender, to show the offer is serious: if you win and then walk away from signing, the beneficiary calls the guarantee. Once the tender is decided, unsuccessful bidders get their letters back. Keeping bid files and guarantee requests visible in one place is covered in our piece on RFP and bid management.
Performance guarantee
Issued when the contract is signed, replacing the bid guarantee. It secures completion in line with the contract and typically stays alive until acceptance, sometimes until the warranty period ends — so on long projects the letter outlives the project, a detail that slips past teams constantly.
Advance payment guarantee
If you take an advance to mobilize, the beneficiary wants a guarantee covering it: you took the money up front, so it should come back if the work does not happen. As the advance is offset against progress payments, the amount can be stepped down, with written consent from the beneficiary and notice to the bank.
The same mechanic appears under other names: payment guarantees to suppliers on credit terms, guarantees lodged with customs, guarantees instead of a rental deposit.
On demand or conditional, dated or open-ended
In an on demand (unconditional) guarantee, the beneficiary claims payment with nothing more than a written demand, and the bank does not argue. Whether you were right, who caused the delay — none of it matters at the moment of the claim; the reckoning happens afterward. In a conditional guarantee, payment depends on documents named in the text — a brake in your favor, which is exactly why beneficiaries insist on unconditional wording.
A dated guarantee expires, and as a rule the right to claim lapses with it. An open-ended one lives until you get the original back or the beneficiary releases you in writing — an obligation with no end date on your books. Watch extension requests too: in many texts, refusing one lets the beneficiary call the guarantee outright.
How to get one from your bank
This is a credit process; the letter is only the shape that credit takes. You present the subject, amount, term, and the exact wording the beneficiary requires, usually along with the tender document or draft contract — the bank wants to see what it is guaranteeing. Then the assessment runs, a limit is opened or checked for headroom, and the letter is drawn up and sent to you or to the beneficiary.
What the bank looks at
- Credit limit and current usage: Your total exposure is weighed with the new letter, and how much of the limit other guarantees already occupy is often decisive.
- Financial statements: Recent balance sheets, leverage, and equity get read; what those statements say is unpacked in our guide to the balance sheet and income statement.
- Trading history: Bounced cheques, late installments, and enforcement records weigh heavily, so knowing how your business credit score is built makes this stage less opaque.
- Collateral: Banks usually want security — blocked deposits, a mortgage, owner guarantees — scaling with the risk they see.
- The underlying deal: The beneficiary, the length of the job, the sector, and whether the wording is unconditional all move the assessment.
These criteria overlap almost entirely with a normal loan application; the checklist in our article on how to get a business loan works nearly one-for-one here. Building the banking relationship long before you need a letter is the most practical way to shorten the process.
How the commission works
No rates here: they vary by country, bank, product, and risk profile. The logic, though, is the same everywhere. Think of the commission as the product of three variables — amount, duration, and risk. The bigger the letter, the longer it lives, and the riskier it looks, the more it costs.
Collection patterns differ too: some banks charge periodically while the letter is outstanding, others up front, and on open-ended letters the commission accrues until the original comes back. Local legislation may add taxes or levies on top, so confirm the current picture with your bank and accountant.
A bank guarantee takes no cash out of your till. It takes your credit limit, your reputation, and your attention instead — all three carry a price, the invoice just arrives later.
Delivery, safekeeping, and release
The original is handled like a negotiable document: the beneficiary keeps the wet-signed copy in their own safe, and you keep a duplicate and the bank's receipt. Where electronic guarantee systems exist, everything runs on a registry and the risk of a lost original disappears.
When the obligation ends, the beneficiary returns the original and you hand it back to the bank. The letter closes only then: that is when the commission stops and your limit is freed. A beneficiary saying "no problem, we won't use it" changes nothing. What closes a guarantee is paper going back, not goodwill.
The silent cost of forgotten guarantees
This is where money quietly leaks. The job finishes, the team disperses, the folder goes to the archive — and the letter is still in the beneficiary's safe. Nobody asks for it back, the bank keeps charging, and a slice of your limit stays locked. Then you chase a new contract, find the limit short, and dig up a guarantee for a job that ended two years ago: the same slow bleed as neglected cheque and promissory note tracking.
When a guarantee gets called
A call happens when the beneficiary writes to the bank demanding the stated amount. The bank compares the demand against the wording; if the text is unconditional and the demand is in order, it pays, then comes to you for reimbursement. The guarantee becomes a drawn cash loan, and you face two separate matters: the dispute, and a new debt to the bank.
The consequences run past the amount: your credit standing takes a hit and the next request attracts heavier collateral demands. So whenever a call looks possible, the first move is toward the beneficiary, not the bank — put the delay in writing, request an extension, look for a negotiated position. Anything settled before a call is far cheaper.
Letters of credit and surety bonds: which tool goes where
In international trade especially, three similar-looking instruments sit side by side and get confused.
| Instrument | What it does | When it is used |
|---|---|---|
| Bank guarantee | Secures performance of an obligation | Only if the promise is broken |
| Letter of credit | Ensures the price of goods or services gets paid | On documents presented in the normal flow |
| Surety bond | Security issued by an insurance company | On non-performance, within policy terms |
A letter of credit is a payment method, expected to be used; a guarantee is a safety net nobody expects to touch. Where that lands day to day is covered under payment methods in our guide on how to start exporting.
A surety bond is the alternative where an insurer, not a bank, provides the security; its appeal is that it does not eat into your cash credit limit. In exchange you get a different application process, different pricing logic, and the open question of whether the beneficiary accepts it — which varies by country and tender rules.
Keeping track of your guarantee portfolio
Up to three letters, anyone can hold it in their head; past fifteen, memory stops working. One record should carry, for every letter: the beneficiary, the contract, the type, the issue date, the expiry or a note that it is open-ended, the issuing bank, where the original sits, and its release status.
The real work is follow-up discipline. Set two reminders per letter: one well before expiry asking "extend or close?", one after acceptance asking "has the original come back?" Keep them in a system with a named owner. Since guarantees hang off contracts, the natural home is beside the contract record — if you run a contract lifecycle management routine, this slots into it.
In Rocketly you can attach each letter to the customer or deal record, create owned tasks and reminders for expiry and release, and tie it to the current account entry in bookkeeping. "Where is that letter?" then lives on a shared screen, not in one person's memory.
Common mistakes
- Signing wording you have not read: Accepting an unconditional, open-ended text means taking on an obligation with no boundary; read the draft with your bank and your lawyer.
- Setting the term by the calendar, not the project: If the expiry does not cover acceptance and warranty, you face an extension request — and refusing one is itself grounds for a call in most texts.
- Leaving release unowned: Delivery forgets the letter, finance never hears the job closed, and every month in between returns as commission and locked limit.
- Concentrating everything at one bank: If all your guarantees sit in one institution, your bidding capacity narrows the moment its risk appetite shifts.
- Forgetting to step down advance guarantees: As the advance is offset the amount can be reduced; if you never ask, you keep paying on the original figure.
Used well, a bank guarantee is the most practical way to buy trust without spending cash; left untracked, it becomes an expense line that grows in silence. The difference is not the letter but the record behind it: which one is with whom, valid until when, and who will retrieve it. To keep that record alongside your contracts, ledgers, and sales pipeline, open a free Rocketly account and set up your first guarantee reminders today. Treat all of this as a general framework and confirm the specifics with your bank and accountant.