RFP vs RFQ vs RFI: Federal Solicitation Types Explained

When a federal agency needs something, it does not just pick up the phone and call a vendor. It follows a structured procurement process governed by the Federal Acquisition Regulation (FAR). Each stage of that process uses a different document — and each document has a specific name, legal weight, and required response format.

Confusing an RFP with an RFQ, or treating an RFI as a formal bid opportunity, are common mistakes that waste your proposal team's time. This guide defines every major federal solicitation type, when agencies use each one, and what the right response looks like.

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Pre-Solicitation Notices (Before the Formal Bid)

Sources Sought Notice

A Sources Sought notice is not a solicitation — it is a market research tool. The agency is asking: "Does this capability exist in the marketplace, and among which types of vendors?"

What it includes:

• Description of the requirement (often draft)
• Request for capability statements
• Questions about your business size and certifications
• Whether the agency is considering a set-aside

Why you should respond: Responding to Sources Sought notices is how you get on the agency's radar before the formal solicitation drops. It is also how agencies decide whether to set the contract aside for small businesses. If no qualified small businesses respond to a Sources Sought, the agency may not set the contract aside.

What to submit: A capability statement (2–3 pages maximum) describing your relevant experience, team qualifications, and past performance. Keep it focused on what the agency asked. Do not submit a full proposal.

Response tips:

• Respond even if you think you are a long shot — Sources Sought responses are intelligence-gathering, not competition.
• State your business size explicitly and which set-aside programs you qualify for.
• Ask if you can schedule a one-on-one market research meeting with the program office.

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Pre-Solicitation Notice (FAR 5.204)

Agencies are required to post notice of a solicitation at least 15 days before publishing the actual solicitation for requirements expected to exceed the simplified acquisition threshold ($250,000). This pre-solicitation notice gives potential offerors time to prepare.

Pre-solicitation notices tell you a solicitation is coming so you can begin internal planning before the clock starts.

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Request for Information (RFI)

An RFI is a formal market research instrument — but it does not result in an award. Agencies use RFIs to gather technical and market information before deciding how to structure a procurement.

Common uses of RFIs:

• Testing the market's capacity to deliver a requirement
• Gathering technical approaches before writing the Statement of Work
• Understanding industry pricing norms
• Identifying potential small business vendors

Important: Responding to an RFI does not give you any rights in the subsequent procurement. Information you share in an RFI response may inform the solicitation structure — which is both an opportunity (to shape requirements in your favor) and a risk (your competitors will see the same solicitation shaped by the market's collective input).

How to respond: Focus on capability, not price. Agencies do not want your pricing in an RFI response — they want to understand what is technically possible and at what general scale.

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Formal Solicitation Documents

Once market research is complete, the agency releases the formal solicitation. This is when the clock starts and proposals or quotes are due.

Invitation for Bid (IFB) — FAR Part 14

An IFB (also called an Invitation for Bids) is used for sealed bidding — the simplest and most transparent procurement method. It is used when requirements are clear, detailed specifications exist, and the award will be made to the lowest price technically acceptable (LPTA) bid.

Process:

1. Agency posts the IFB publicly
2. Bidders submit sealed bids by the deadline
3. All bids are opened publicly at the bid opening date and time
4. Award goes to the lowest responsive, responsible bidder

Characteristics:

• No negotiation — the government accepts the lowest bid or rejects all bids
• Strict responsiveness rules — late bids are rejected; incomplete bids may be rejected
• Price is everything — technical approach matters only to the extent it meets minimum specs

Best used for: Construction, commodity purchases, and services with very detailed specifications where price is the only differentiator.

Not common for: Professional services, IT, or any work where technical approach matters.

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Request for Quotation (RFQ) — FAR Part 13

An RFQ is used for simplified acquisition — purchases below the simplified acquisition threshold ($250,000 for most agencies). The government is soliciting price quotes, not formal proposals.

Two types of RFQ contexts:

1. Simplified Acquisition RFQ (FAR 13):

• Used for purchases under $250,000
• Can be oral, written, or electronic
• Less formal documentation required
• Award typically within days to weeks
• GSA's e-Buy system handles many RFQs for Schedule holders

2. GSA Schedule RFQ (FAR 8.4):

• Used to place orders against GSA Multiple Award Schedule contracts
• Can exceed $250K
• Requires formal competition among Schedule holders for orders above certain thresholds
• Posted in GSA eBuy or directly solicited to a limited number of Schedule holders

How to respond to an RFQ: Provide a price, delivery timeline, and brief capability confirmation. RFQ responses are quotes, not proposals — do not write a 50-page document in response to an RFQ.

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Request for Proposal (RFP) — FAR Part 15

An RFP is the formal solicitation for competitive negotiated procurement — the most common and complex solicitation type for professional services, IT, and complex acquisitions.

Key characteristics:

• Technical factors evaluated in addition to price
• Best value source selection (not necessarily lowest price wins)
• Negotiation is permitted (discussions, exchanges, final proposal revisions)
• Written proposals required — typically with separate technical, management, past performance, and price volumes

RFP document structure:

• Section A: Solicitation/Contract Form (SF 1449 or equivalent)
• Section B: Supplies/Services and Prices
• Section C: Statement of Work or Performance Work Statement
• Section D: Contract Data Requirements List (CDRLs)
• Section E: Inspection and Acceptance
• Section F: Deliveries or Performance
• Section G: Contract Administration
• Section H: Special Contract Requirements
• Section I: Contract Clauses (FAR and agency clauses)
• Section J: Attachments and Exhibits
• Section K: Representations and Certifications
• Section L: Instructions to Offerors
• Section M: Evaluation Criteria

The most important sections:

• Section C (Statement of Work) — defines exactly what you are being hired to do
• Section L (Instructions) — tells you exactly how to format your proposal
• Section M (Evaluation Criteria) — tells you how the government will score your proposal

If you read only three sections of an RFP, read L, M, and C — in that order.

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Request for Task Execution Plan (RTEP or RFTOP)

Used to place task orders against existing IDIQ contracts. Instead of a full RFP, the agency issues a task order competition limited to the IDIQ contract holders.

What makes RTEPs different:

• Faster timeline (30–45 days typical vs. 60–90 days for a full RFP)
• Proposals focus on the specific task order scope
• Past performance evaluated from the IDIQ holder's record
• Price competition limited to the IDIQ ceiling rates or task order pricing

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Quick Reference: Which Solicitation Type Are You Responding To?

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What "Best Value" Actually Means

Most RFPs award on best value — a trade-off analysis between technical merit, past performance, and price. The evaluation factors and their relative importance are stated in Section M.

Common best-value structures:

• LPTA (Lowest Price Technically Acceptable): Meet the minimum technical bar; price wins.
• Tradeoff (Technical Paramount): Technical factors outweigh price significantly; a higher-priced offer can win if technically superior.
• Equal Factors: Technical and price weighted equally; strong technical + competitive price is the winning strategy.

Understanding Section M's weighting before you price is essential. If technical is worth 70% of the score, investing in proposal quality is worth more than shaving your price.

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How RFxNerd Helps You Respond to Every Solicitation Type

Tracking dozens of solicitations across SAM.gov, GSA eBuy, and agency portals is a full-time job. RFxNerd monitors all federal solicitation channels, classifies each notice by type and urgency, and alerts you to Sources Sought and RFIs early — so you can engage before the formal solicitation drops and shape the requirements in your favor.

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Key Takeaways

• Sources Sought and RFIs are pre-bid market research tools — respond to get on agency radar and shape requirements, but do not expect an award.
• IFBs are sealed bids — lowest compliant price wins, no negotiation, typically used for commodity or construction purchases.
• RFQs are for simplified acquisitions under $250K (or GSA Schedule orders) — respond with a price quote, not a proposal.
• RFPs are the most common vehicle for professional services and IT — they require a full written proposal and evaluate technical merit alongside price.
• Section L (Instructions) and Section M (Evaluation Criteria) are the first two sections you should read in any RFP.
• Best value does not always mean lowest price — invest in proposal quality when technical factors are heavily weighted.

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