What is Bank Guarantee?
Updated: 11 March 2026
A bank guarantee is a written commitment from a bank to a beneficiary (typically the client) that the bank will pay a specified amount if the counterparty (typically the contractor or supplier) fails to meet its contractual obligations. The bank acts as an independent third party assuming the financial risk. Bank guarantees are virtually standard in the construction sector for projects above a certain threshold and are also used in lease agreements and large procurement contracts.
How does bank guarantee work?
A bank guarantee functions as a financial safety net. The client (beneficiary) wants assurance of compensation if the contractor (guarantee applicant) fails to complete the work, does not remedy defects, or becomes insolvent. The bank issues a guarantee statement committing to pay a specified amount on first demand or upon proof of default.
There are two main forms. An abstract bank guarantee (on first demand) obliges the bank to pay as soon as the beneficiary submits a claim, without the bank assessing the underlying default. This is the strongest form of security. An accessory bank guarantee requires the beneficiary to demonstrate that a genuine default has occurred before the bank pays out.
In construction, bank guarantees are linked to specific contract phases. A performance guarantee covers the risk that the contractor does not complete the work (typically 10% of the contract sum). A maintenance period guarantee runs after handover and covers defects that emerge during the warranty period (typically 5% of the contract sum).
The cost of a bank guarantee ranges from 1% to 3% of the guaranteed amount per year, depending on the applicant's creditworthiness and the guarantee term. The bank typically requires collateral or blocks a portion of the applicant's credit facility.
Pay close attention to the exact guarantee terms: the expiry date, currency, maximum amount, conditions for calling the guarantee, and whether partial calls are permitted. An expired bank guarantee provides no protection whatsoever.
Why does this matter for SMBs?
In construction, the insolvency risk of contractors and subcontractors is a real danger. A bank guarantee is often the only instrument that protects you against financial loss if a contractor stops mid-project or fails to remedy defects after handover.
For SMBs acting as contractors themselves, providing bank guarantees places significant demands on their credit facility. Blocking 10% of the contract sum with the bank means less financial flexibility for other projects. Good management of outstanding guarantees is therefore essential.
How to manage this correctly
- 1Require a bank guarantee for construction projects above a threshold that matches your risk tolerance (common: from 50,000 euros)
- 2Check whether the guarantee is on first demand or requires proof of default, this makes a significant difference in disputes
- 3Record the expiry date of every bank guarantee and set a reminder well before that date to arrange renewal
- 4Store bank guarantees in your contract management system alongside the underlying contract and handover documentation
- 5When providing bank guarantees, prefer the lowest guarantee percentages contractually acceptable to protect your credit facility
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