In brief. A bank guarantee and a surety bond guarantee the same thing to a third party, but the bank guarantee uses up a risk line and counts in the CIRBE, whereas surety does not, preserving borrowing capacity. A bank guarantee is usually faster when a line is available; surety avoids concentrating guarantees at the bank and suits recurring volume better. Neither is systematically cheaper: it depends on the amount, the term and the profile. Often the best option is to combine them.
A finance director preparing the definitive guarantee for a tender faces a concrete decision: do they resolve it with a bank guarantee or with a surety bond? Both serve the same purpose —guaranteeing a third party that your company will deliver— but they take different routes with very different consequences for treasury. This guide compares the two instruments and, above all, clarifies when each one is preferable.
If you want to understand in depth what surety is, its types and its legal framework, you will find the detail in our article on the surety bond. Here we focus on the decision.
The same legal function, a different financial effect
A bank guarantee and a surety bond are both guarantees in favour of a third party: if the obligor (your company) fails to deliver, the guarantor pays the beneficiary and then recovers the amount paid from you. The difference does not lie in what they guarantee, but in who issues the guarantee and how it affects your financial capacity.
- The bank guarantee is issued by a credit institution against your risk line. It is recorded in the CIRBE (the Bank of Spain's Central Credit Register) and therefore reduces your borrowing capacity.
- The surety bond is issued by an insurance company under Article 68 of Spain's Law 50/1980. It does not count as financial risk in the CIRBE, so it does not use up the bank line.
Comparison: bank guarantee vs surety bond
| Aspect | Bank guarantee | Surety bond |
|---|---|---|
| Who issues it | Credit institution (bank) | Insurance company, via a broker |
| CIRBE impact | Uses up the risk line | Does not count as financial risk |
| Financing capacity | Reduces it | Preserves it |
| Cost | Guarantee commission (depending on line and guarantees) | Insurance premium (depending on amount, term and profile) |
| Processing | At the bank, on the existing line | Insurer's risk analysis; then a surety line |
| Diversification | Concentrates risk in one institution | Diversifies the sources of guarantee |
| If it is called | The bank pays and debits the account/line | The insurer pays and recovers from the policyholder |
| Best suited for | A one-off guarantee with an available line | Recurring volume of guarantees; preserving CIRBE |
The specific figures —cost, timelines, terms— depend on each institution, company and transaction. This table sets out the structural differences; it does not replace an analysis of your case. Request a comparison.
Impact on the CIRBE and financing capacity
This is the difference that weighs most for a large account. A bank guarantee takes up part of the risk line your company holds with the institution: each live guarantee reduces the capacity to finance working capital, investment or growth. When a company keeps several guarantees running at once —common in construction, engineering or supply— that usage can become considerable.
A surety bond breaks that dependency: as it is not recorded in the CIRBE as financial risk, it frees up the bank line for what really needs it and diversifies the sources of guarantee, avoiding concentrating all signature risk in a single institution. For a treasury that wants to preserve financial muscle, this is the decisive argument.
Cost: bank commission versus insurance premium
Here it is worth being cautious. A bank guarantee is paid for with a commission that the institution sets according to the line granted, the amount guaranteed and the client's profile. A surety bond is paid for with a premium that the insurer calculates according to the amount, the term, the type and the policyholder's solvency.
Neither instrument is systematically cheaper than the other. The advantage of surety is usually financial —not using up CIRBE— rather than one of nominal price. In some transactions a bank guarantee may be more economical, and in others a surety bond. That is why the comparison should be made transaction by transaction, not in the abstract.
Processing and timelines
The bank guarantee is quick when the company already has a line available: the institution knows the client and formalises the guarantee within a few days. The limit is the line itself, which may run out.
The surety bond requires, the first time, that the insurer carries out its own risk analysis (balance sheet, accounts, track record). Once the surety line is approved, issuing successive guarantees is fast. Arranging it through an independent broker with access to several companies allows risk appetite and terms to be compared, and each guarantee to be placed where it fits best.
When each one is preferable
There is no universal winner. The choice depends on your situation:
- You have a comfortable bank line and a one-off guarantee → a bank guarantee may be the simplest and quickest route.
- You keep several guarantees running at once → surety avoids saturating the line and preserves financing capacity.
- You want to reserve the bank line for working capital or investment → surety frees up that margin.
- You need a customs bond or guarantees before the public administration → a surety bond is expressly accepted by Spain's Law 9/2017 on Public Sector Contracts.
- You are concerned about depending on a single institution → surety diversifies your sources of guarantee.
- It is your first guarantee and you have not yet formed a view → it is worth comparing both before committing; an error in the guarantee form can rule out a bid.
Can a bank guarantee and a surety bond be combined?
Yes, and often it is the most efficient approach. Many companies reserve the bank guarantee for one-off guarantees and channel the bulk of their volume through surety, so the bank line stays free for financing. The optimal structure —which guarantee goes through each route— is precisely what a broker analyses when designing the guarantee programme for a large account.
Frequently asked questions
Can I use a bank guarantee and a surety bond at the same time? Yes. They are compatible instruments and many companies combine them: they resolve a one-off guarantee with a bank guarantee and reserve the surety bond for the rest, so they do not concentrate all their guarantees in the bank line. The optimal structure depends on your volume of guarantees and on your relationship with the institutions.
Which is faster to arrange, a bank guarantee or a surety bond? If the company already has a risk line available at the bank, a bank guarantee is usually formalised within a few days. A surety bond requires the insurer's risk analysis the first time, but once the surety line is open, issuing successive guarantees is quick. It depends on the case and the company.
If my surety is called, does it affect my credit history? A surety bond is not recorded in the CIRBE as financial risk, unlike a bank guarantee. That said, if the guarantee is called, the insurer recovers the amount paid from the policyholder; the specific impact will depend on the terms of the policy.
Is a surety bond always cheaper than a bank guarantee? No. The cost depends on the amount, the term, the risk profile and the institution or company. The advantage of surety is usually financial (it does not use up CIRBE), not necessarily one of price. It is worth comparing both in each transaction.
Sources and regulations
- Spain's Law 50/1980 of 8 October on Insurance Contracts, Article 68 (surety insurance).
- Spain's Law 9/2017 of 8 November on Public Sector Contracts, Articles 106 and 108 (tender guarantees).
- Bank of Spain Central Credit Register (CIRBE) — treatment of guarantee (signature) risk.
- Directorate-General for Insurance and Pension Funds (DGSFP) — supervision of insurers and intermediaries.
New Brokers is an independent insurance broker registered with the DGSFP under code J0140. This content is for guidance only and does not constitute binding advice; cover, guarantees and terms are governed by each policy and company. We work under the client's mandate, with access to the whole market —including Lloyd's— and defence in the event of a claim.
Torn between a bank guarantee and a surety bond for your next transaction? Request a comparison with no obligation. We assess your case and guide you towards the route that best preserves your financial capacity.
