Invitation for Bids (IFB)

An Invitation for Bids (IFB) is the formal document that opens a competitive procurement for goods, plant, or works, inviting eligible suppliers to submit sealed, priced bids against a defined specification and set of conditions.

What is an Invitation for Bids?

The IFB is to goods and works what a request for proposals is to consulting services. It packages the specification or scope, the conditions of contract, the bid form and pricing schedule, the evaluation criteria, the eligibility requirements, and the submission deadline into one document set issued to bidders. Under icb, the IFB follows an internationally advertised notice and goes to any eligible firm; under ncb it is advertised domestically. Bids are submitted sealed and opened publicly at a stated time, and award goes to the lowest evaluated, substantially responsive bidder that meets the qualification criteria. Larger IFBs are often preceded by prequalification, and bidders typically lodge a bid-security with their bid.

Because the IFB defines exactly what "responsive" means, it is the controlling document for whether a bid is accepted or rejected on technical and commercial grounds.

Why the IFB matters for bidders

The IFB is the rulebook for the competition, and the most common way to lose a low-priced bid is to be ruled non-responsive on a detail buried in it. Winning bidders read the IFB for the precise definition of responsiveness, the exact pricing schedule format, the required securities, and the documents that must accompany the bid, then build a checklist so nothing mandatory is omitted. The public bid opening means prices become visible to competitors, so accurate, competitive pricing against the evaluation rules matters more than guesswork. Firms that track international and national notice boards see IFBs as they publish and have time to qualify, price, and assemble a complete, responsive bid before the deadline.

FAQ

What is the difference between an IFB and a request for proposals?

An IFB procures goods, plant, or works through sealed priced bids evaluated mainly on responsiveness and price; a request for proposals procures consulting services evaluated on technical quality and price.

What makes a bid non-responsive to an IFB?

A material deviation from the requirements of the IFB, such as a missing bid security, an incomplete pricing schedule, or a failure to meet a mandatory technical specification, can render a bid non-responsive.

Are bids under an IFB opened publicly?

Yes. Bids are submitted sealed and opened at a public bid opening at the time stated in the IFB, which is part of the transparency of the process.