A seguro de caución is a contract of insurance, not a bank product. Article 68 of the Ley de Contrato de Seguro defines it: the insurer undertakes, if the policyholder fails to meet a legal or contractual obligation, to indemnify the beneficiary the policy names, and everything the insurer pays is owed back to it by the policyholder. Three parties, then — the tomador whose obligation is secured, the asegurado who is paid if it is not met, and the insurer standing between them — and a product that can only be written by an insurer authorised in ramo 15, on its own capital, under prudential supervision.
For the beneficiary it does the same job as an aval bancario: a contracting authority, a tax office or a counterparty holding a certificado de seguro de caución is holding an undertaking to pay from a supervised institution. For the company that buys it the two are not the same at all. An aval is a bank exposure, reported as one, and it consumes the limit the same bank would otherwise lend against — often with cash pledged behind it. A caución is priced as a premium and sits outside the banking relationship, so the facility that funds plant, materials and payroll is intact when the work has to start.
Spanish law admits it wherever public security is called for. The public procurement act, Ley 9/2017, lists the seguro de caución beside cash, securities and the aval as a form in which the garantía provisional and the garantía definitiva may be lodged, with one condition: the insurer must be authorised to operate in the ramo. The Ley General Tributaria admits a certificado de seguro de caución as security for an aplazamiento or fraccionamiento of tax debt. And the Caja General de Depósitos, where most public-sector guarantees are lodged — including the security a renewables developer posts for grid access and connection — accepts it as a form of guarantee in its own right.
What a beneficiary checks before accepting one is short and worth knowing. That the insurer is entered on the DGSFP’s administrative register for ramo 15, caución, and is active — an insurer from another member state appears there under an L-prefixed clave, with prudential supervision remaining at home. That the certificate is in the prescribed model, where the authority publishes one, and names the right beneficiary, sum and term. And, on a first-demand wording, that the demand mechanics are the ones the pliego requires. The register is a search rather than a set of pages: open it and enter the clave, and the entry it returns is the record.
Placing one is a broker’s job, and it goes better before the award than on the day the garantía definitiva is due. What the underwriter needs is what any underwriter needs: the last audited accounts and the current management figures, the contract or the resolution the security is for, the exact wording the beneficiary requires, and the group structure, so the counter-indemnity — which is what gives article 68’s right of recovery its effect — comes from the entity that holds the assets. A company that expects several guarantees in a year should ask for a facility rather than a bond: one set of accounts, one counter-indemnity, and each subsequent certificate becomes a phone call.
A caución has a life after issue. A garantía definitiva runs to the end of the plazo de garantía and is released against the acta de recepción and the authority’s cancelación; an advance payment guarantee reduces as the advance is recovered; a tax certificate lapses when the last instalment is paid. Those releases are administrative, but they are also capacity: a facility is measured by what is outstanding on it, so a release chased promptly is the next award’s security. If a demand is made, the insurer pays within the terms of the certificate and then looks to the policyholder under the counter-indemnity — which is why the underwriting at the start is real, and why a caución is not a way of obtaining security a bank has refused.
Two things it is not. It is not credit insurance: that is ramo 14, crédito, which covers a business against non-payment by its own customers, and a company that needs both buys two different policies. And it is not cheaper by definition. The premium reflects the strength of the policyholder, the term, the wording and the security behind the counter-indemnity, exactly as a bank’s pricing would if the bank priced the exposure honestly rather than folding it into the relationship. What it reliably is, is capacity: security the administration accepts, from a balance sheet published in full, without spending the line that funds the work.
Written by the underwriting team at FDI Insurance d.a.c., Dublin. This piece is general information, not advice on any particular transaction — and it is not an offer of insurance.
