Fixed-Budget Selection (FBS)

Fixed-Budget Selection (FBS) is a consulting procurement method used by multilateral development banks in which the maximum available budget is disclosed to all competing firms and the contract is awarded to the technically highest-scoring proposal whose financial offer does not exceed that published ceiling.

What is Fixed-Budget Selection?

FBS inverts the logic of lcs. Under LCS, the technical bar is a pass/fail gate and the lowest financial proposal wins. Under FBS, the financial ceiling is fixed and published, and the winner is the firm that scores highest on technical quality while remaining within that ceiling. Every firm that submits a financial proposal at or below the stated budget and is deemed technically responsive is ranked purely on its technical score, and the top-ranked compliant firm is awarded the contract.

The method is designed for situations where the bank or borrower knows exactly how much it can spend on an assignment and wants to get the best available expertise within that envelope. By publishing the budget in the Request for Proposals, the institution removes price as a strategic lever and encourages competing firms to compete on the quality of their approach, the experience of their key staff, and the depth of their understanding of the Terms of Reference (tor). Proposals priced above the ceiling are disqualified regardless of their technical merit.

FBS appears in the World Bank Procurement Framework and in ADB guidelines alongside qcbs, qbs, and lcs as one of the four main consulting-selection variants.

Why FBS matters for bidders

FBS is unusual in international procurement because the institution gives away its budget before bids are submitted. A firm that understands this dynamic will price to the ceiling, allocating the full available budget to the highest-quality team and methodology rather than competing on a lower price that provides no advantage. The winning behaviour is to study the TOR carefully, assemble the strongest technically defensible team the budget allows, and structure the proposal to score maximum marks against the published evaluation criteria. Firms that price well below the ceiling voluntarily sacrifice scope or expertise that could have differentiated them. Firms that price above it are disqualified regardless of their technical strength.

Example

The World Bank uses FBS when a project has a fixed grant allocation for a specific advisory service. A World Bank-financed climate adaptation project in Kenya may have a USD 250,000 allocation for a coastal risk assessment study. The Request for Proposals states this budget explicitly. Consulting firms submit technical proposals ranked on methodology, key staff, and relevant experience, together with financial proposals capped at USD 250,000. The firm with the highest technical score among those that stay within the budget wins the assignment.

Frequently Asked Questions

Why does FBS disclose the budget before bids are submitted?

FBS is designed for situations where the budget is fixed and the institution wants the best expertise that money can buy, rather than the cheapest compliant offer. Disclosing the ceiling shifts competition entirely to technical quality.

What happens if a firm prices above the fixed budget?

The proposal is disqualified and is not evaluated further, regardless of how strong the technical submission may be. Financial compliance with the stated ceiling is a mandatory condition.

How does FBS differ from QCBS?

Under qcbs, both technical quality and price are scored and combined using a published weighting, so a lower financial offer improves the combined score. Under FBS, the budget is fixed and disclosed, price is only a pass/fail check against the ceiling, and technical quality alone determines the winner.