Retention bond

A retention bond (retention-money guarantee) is a bank or similar undertaking that allows an employer to release cash retention to the contractor while retaining security for outstanding defect-liability exposure. It is a form of demand guarantee tied to retention money under the construction or supply contract rather than to tendering or mobilisation advances.

Retention bond use on bank EF and CRE desks

On export finance and commercial real estate construction desks, retention bonds appear after taking over, when cash trapped as retention becomes a working-capital issue for the contractor. FIDIC's MDB Harmonised Conditions define Retention Money as the accumulated retention withheld under interim payment certificates and paid under Sub-Clause 14.9. The same suite's guidance materials list a retention guarantee among standard forms of security that parties may select through the Particular Conditions.

World Bank works documents incorporating those conditions provide that, unless Particular Conditions state otherwise, after the Taking-Over Certificate is issued and the first half of Retention Money is certified, the contractor may substitute a guarantee for the second half of Retention Money. The guarantee must be in the amounts and currencies of that second half, in an approved form, issued by a reputable bank or financial institution, and valid until the works are completed and defects remedied on the same basis as the performance security under Sub-Clause 4.2.

Mechanics under FIDIC and World Bank payment clauses

Sub-Clause 14.9 releases retention in stages:

• when the Taking-Over Certificate is issued for the works, the first half of Retention Money is certified for payment (with proportional treatment for sections)
• after the latest Defects Notification Period expiry, the outstanding balance is certified
• if a retention guarantee is delivered for the second half, the employer pays that second half against the guarantee

A coordination rule applies when the Performance Security is itself a demand guarantee: if, at taking over, the amount still guaranteed under the Performance Security exceeds half of the Retention Money, no separate retention guarantee is required; if it is less, the retention guarantee need only cover the difference. That prevents double-securitising the same residual exposure.

Where the retention bond is issued under URDG 758, calls follow complying demand and document examination independent of the underlying defect dispute. CRE lenders watching construction facilities treat the substitution as a liquidity event for the borrower that must still leave the employer (and indirectly the project cash flows) protected through the defects period.

Retention bond versus performance and advance-payment security

A performance bond covers proper performance through completion and defects remedying and is usually required from award. An advance payment guarantee secures prepaid mobilisation funds and reduces with repayment. A retention bond replaces cash already earned but withheld. Timing, amount and reduction logic differ, even when all three instruments are independent demand guarantees on the same project file.