Invitation for Bid (IFB)

An Invitation for Bid (IFB) is the formal solicitation document used in sealed bidding procurements, where the government receives fixed-price bids and awards to the lowest responsive, responsible bidder without conducting negotiations or evaluating technical proposals.

What is an Invitation for Bid?

An IFB is the solicitation vehicle used when an agency has chosen sealed bidding as its procurement method. Under FAR 14.201, the IFB must describe the government's requirements clearly and include all necessary clauses, specifications, delivery schedules, and terms so that a bidder can submit a complete and compliant bid with price as the only evaluation criterion.

A standard IFB under the Uniform Contract Format includes:

• Section A: Solicitation/contract form
• Section B: Supplies or services and prices
• Section C: Description, specifications, or work statement (fully detailed)
• Section D: Packaging and marking
• Section E: Inspection and acceptance
• Section F: Deliveries or performance
• Section G: Contract administration data
• Section H: Special contract requirements
• Section I: Contract clauses
• Section J: Attachments (drawings, specifications, wage determinations)
• Section K: Representations, certifications, and statements

Notably, the IFB does not contain Section L (instructions for preparing proposals) or Section M (evaluation factors) in the RFP sense, because there is no technical proposal and the only evaluation criterion is price. Bid opening is public, with all submitted prices read aloud.

Why IFBs matter for government contractors

IFBs represent the most price-sensitive procurement method in the government market. Construction, facilities maintenance, commodity supply, and similar well-defined services frequently use IFBs. Winning requires accurate cost estimating, knowledge of competitor cost structures, and disciplined overhead and profit management. A bid that is 1% too high loses; a bid that is 5% too low can win but devastate profit margins. Contractors in construction, supply, and maintenance-heavy sectors must develop sophisticated cost modeling capabilities to compete effectively on IFBs. Federal construction contracting relies heavily on IFBs.

Example

The Army Corps of Engineers issues an IFB for installation of a 500-kilowatt solar array at Fort Bragg. The IFB includes full engineering drawings, material specifications, performance standards, and a completion date. Four contractors submit sealed bids: $2.1M, $2.4M, $2.6M, and $3.0M. The Corps verifies the low bidder's bid is responsive (complies with all IFB terms) and the bidder is responsible (licensed, bonded, financially capable). The contract is awarded at $2.1M with no further discussion.

Frequently Asked Questions

Can an IFB include multiple evaluation criteria beyond price?

No. If the agency wants to evaluate technical capability, past performance, or other non-price factors, it must use competitive proposals via an RFP, not sealed bidding via an IFB. The sealed bidding statute requires award to the lowest responsive, responsible bidder, adding technical evaluation criteria would make the process a negotiated procurement.

What happens if only one bid is received?

The agency may award to the single bidder if the price is fair and reasonable (determined through price analysis), or may cancel the IFB and re-solicit. A single bid typically triggers a price reasonableness analysis comparing the bid to the government's independent cost estimate.

What is the minimum posting period for an IFB?

FAR 5.203 generally requires IFBs to be posted on SAM.gov for at least 30 days before bid opening. The contracting officer may reduce this period if urgency exists, but must document the justification.

What makes a bid non-responsive in an IFB?

A bid is non-responsive if it fails to conform to the material requirements of the IFB, such as failing to acknowledge a material amendment, bidding on different quantities, conditioning the bid on changes to specifications, or failing to sign the bid form. Non-responsive bids are rejected without price consideration.