Bid security is a firm financial commitment that protects a project owner if a selected bidder does not execute the contract or furnish required bonds.
Bid security is a firm financial commitment submitted with a bid to protect the project owner if the selected bidder does not honor specified post-award obligations. Depending on the solicitation, acceptable security may include a bid bond, bank guarantee, irrevocable letter of credit, certified check, or another approved instrument.
Bid security is also called a bid guarantee or tender security in some markets. The label alone does not determine the parties’ rights. The solicitation, security instrument, governing law, amount, expiry, and claim conditions control.
The usual structure has three economic roles:
| Party | Role | Main exposure |
|---|---|---|
| Bidder or principal | Submits the bid and arranges the security | Fees, collateral, credit-line usage, reimbursement, and liability for failure to proceed |
| Project owner or beneficiary | Receives the protected commitment | Delay, rebidding expense, and a higher replacement price if the selected bidder does not proceed |
| Surety, bank, or other issuer | Provides the bond or undertaking | Payment under the instrument followed by recovery from the bidder under indemnity or reimbursement terms |
A simplified sequence is:
This sequence is an orientation, not a substitute for the actual procurement documents.
| Form | Who provides the commitment | What to verify |
|---|---|---|
| Bid bond | Surety | Penal sum, approved surety, signatures, power of attorney, and bond wording |
| Bank guarantee | Bank | Independent or accessory nature, demand documents, expiry, presentation place, and governing rules |
| Irrevocable letter of credit | Bank | Beneficiary, drawing conditions, available amount, expiry, and documentary compliance |
| Certified or cashier’s check | Bank-supported payment instrument | Payee, amount, delivery, custody, return process, and forfeiture terms |
| Cash deposit or approved securities | Bidder-provided asset | Eligibility, valuation, custody, release, and opportunity cost |
Not every procurement accepts every form. For example, the U.S. Federal Acquisition Regulation provision at FAR 52.228-1 lists several forms of firm commitment, but an agency can specify a narrower acceptable form when authorized.
| Instrument | Main period covered | Main risk addressed | Typical release point |
|---|---|---|---|
| Bid security | Bid submission through award and required contract execution | Selected bidder does not execute required documents or furnish required bonds | Contract documents and required bonds are accepted, subject to the applicable terms |
| Performance bond | Contract performance period | Contractor does not perform covered contractual obligations | Completion and any stated warranty or closeout conditions |
| Payment Bond | Construction or supply performance period | Covered subcontractors, labor providers, or suppliers are not paid | Expiry of the applicable claim period and satisfaction of bond conditions |
The instruments can appear in the same procurement, but one does not automatically replace another.
Assume a solicitation requires bid security equal to 20% of the bid price. A contractor submits a bid of $2,400,000.
| Calculation | Amount |
|---|---|
Required security: $2,400,000 x 20% | $480,000 |
| Next acceptable bid | $2,550,000 |
| Simplified replacement-price difference | $150,000 |
If the selected bidder refuses to execute the contract and the owner awards the same scope to the next bidder, the price difference is $150,000. The bid security may be available toward a covered loss, but the actual claim is not automatically $150,000 or $480,000. The result depends on the solicitation, instrument, mitigation, additional procurement costs, available remedies, defenses, and governing law.
Under the current U.S. federal rule in FAR 28.101-2, when a federal bid guarantee is required, the contracting officer sets an amount adequate to protect the government, at least 20% of the bid price and no more than $3 million. That federal rule should not be generalized to state, local, private, or non-U.S. procurement.
Bid security can affect more than the apparent fee:
For accounting or disclosure, determine whether the arrangement creates a fee, restricted cash, collateral, a contingent obligation, a provision, or a disclosure requirement under the applicable standards and facts. The existence of a bid bond alone does not answer that question.
Bid-security outcomes are contract-, procurement-, and jurisdiction-specific. This page provides financial education, not legal, procurement, surety, banking, accounting, or bidding advice.