Bank Guarantee, FDR or Insurance Surety Bond: Which to Offer and What Each Costs

A buyer asking for security rarely cares which instrument you use, within the list the contract permits. You should, because the three common options have very different costs once locked capital is counted, and the cheapest headline rate is regularly the most expensive option overall.

The three instruments

Bank guarantee. Your bank undertakes to pay the buyer up to a stated amount if you default. The bank charges commission and holds margin money as a lien-marked deposit.

Fixed deposit receipt. You place a deposit and pledge it to the buyer. The full amount is locked, but it earns interest, and there is no commission.

Insurance surety bond. An insurer, rather than a bank, provides the undertaking. You pay a premium. There is generally no margin money lien, which is the structural difference that matters.

Which are acceptable is decided by the tender document or the contract. Offering one the document does not permit is a rejection, so read the clause before doing any arithmetic.

The comparison that actually matters

The instinct is to compare fees. The better comparison is total cost of capital over the instrument's life, which has three parts:

1. The fee or commission paid
2. The capital locked, and what it would otherwise earn or enable
3. Any interest the locked capital earns back

Set out that way, the three look different from how they look on a rate card.

Bank guarantee. Commission is a real cost. Margin money is locked, usually earning deposit interest but unavailable and, more importantly, reducing the limits available for further guarantees. Only part of the face value is tied up, which is its advantage over an FDR.

Fixed deposit receipt. No commission, and the deposit earns interest. But the full face value is locked, not a margin. For a large security on a long contract this is the most capital-intensive option, even though it looks free.

Insurance surety bond. A premium, with no margin money lien. For a firm whose constraint is bank limits rather than cash, this is the structural advantage: it does not consume the banking headroom you need for the next contract.

A worked way to think about it

Take a security requirement of a given amount for a given number of years, and compute for each instrument:

• Fee cost = commission or premium rate × amount × years
• Locked capital = margin percentage × amount, or the full amount for an FDR
• Opportunity cost = locked capital × what that capital would earn or enable, × years

Then add fee cost and opportunity cost. The instrument with the lowest total is the one to choose, and it will not always be the same instrument across contracts, because the duration changes the weighting.

The rates to use are your own: your bank's commission, your insurer's premium, your deposit rate, and an honest view of what a rupee of free capital is worth in your business. That last one is usually much higher than the deposit rate, because free capital is what lets you bid the next tender.

What changes the answer

Duration. Long guarantees favour instruments without locked capital, because the opportunity cost compounds while the fee is often per annum on both.

Your bank limits. If your guarantee limit is the binding constraint on how much work you can hold, an instrument that does not consume it is worth paying more for. Performance bank guarantees explains how dead guarantees quietly eat that limit.

Your cash position. If cash is the constraint and limits are not, a bank guarantee's partial margin beats an FDR's full lock.

Whether the buyer will accept it. All of this is academic where the contract permits only one instrument.

The administrative dimension

One thing that does not show in the arithmetic: release. Every instrument has to be formally released and, for a bank guarantee, the margin money lien has to be lifted separately. An instrument that is administratively easier to release is worth something, because the failure mode across all three is the same: capital left locked against a contract that finished.

Whatever you choose, record the expiry and the release step alongside it. See retention money and security deposits for the same problem in another form.

Where this sits

Security instruments are one of the four financing costs of a government contract, alongside EMD, retention and the running bill cycle. Getting the instrument choice right is worth a fraction of a percent on a contract. Getting the pricing right is worth considerably more, but the two are the same discipline.

Avsar keeps your guarantees, deposits and their margin positions in one register with expiry dates and release status. See the treasury module.