RFI vs RFP vs RFQ: differences and when to use each

The difference between an RFI, an RFP, and an RFQ is how much the buyer already knows. An RFI asks what is possible, an RFP asks how you would solve a defined problem, and an RFQ asks what a fully specified requirement will cost.

For vendors, the distinction decides how much effort to invest and what to send. This RFI vs RFP vs RFQ guide compares the three documents, explains the related terms RFT, ITB, and IFB, and shows how to write an RFI response that earns a place on the RFP shortlist.

RFI vs RFP vs RFQ at a glance

What is an RFI?

A request for information is the buyer’s research tool. It goes out when a team knows it has a problem but has not settled on the type of solution, the budget, or the shortlist.

A typical RFI asks vendors to describe:

• Their company, sector focus, and relevant experience
• The capabilities that address the stated problem
• Implementation approaches and typical timelines
• Security, compliance, and integration fit
• Indicative pricing models, without a binding quote

The buyer uses the answers to define requirements and decide who receives the RFP. An RFI rarely has a winner. It has a shortlist.

What is an RFP?

A request for proposal describes the problem in detail and asks vendors how they would solve it. The buyer has a defined need and a budget, but leaves the solution open enough for vendors to propose different approaches.

RFPs usually contain background, scope, requirements, submission instructions, evaluation criteria, and a pricing section. Responses are scored by an evaluation committee against weighted criteria, then shortlisted vendors may be invited to present. Our step-by-step guide on how to respond to an RFP covers the full process, and the RFP response template gives a section-by-section structure.

What is an RFQ?

A request for quotation applies when the buyer knows exactly what it needs: the product, specification, quantity, and delivery terms. The remaining question is price.

RFQs are common for standard goods, materials, licenses, and well-defined services. The response is usually the buyer’s own pricing form, completed with unit prices, totals, lead times, and validity periods. Because suppliers are compared mainly on price, an RFQ gives little room for differentiation beyond delivery, terms, and service levels.

RFT, ITB, and IFB: other names for formal bids

Procurement vocabulary varies by country and sector:

• RFT (request for tender): the common term in the UK, Europe, and Australia, especially in the public sector. In practice it covers what other markets call an RFP or a formal bid.
• ITB (invitation to bid) and IFB (invitation for bid): formal requests for priced bids against a fixed specification. In US public purchasing, an IFB is associated with sealed bidding, where the contract typically goes to the lowest-priced responsive and responsible bidder.

If you receive one of these, read the evaluation section before deciding how to respond. The name matters less than whether the buyer scores on price alone or on weighted quality criteria. For bids scored mainly on compliance and price, our bid proposal template is the closer fit.

How the three documents fit into one buying process

Many enterprise purchases move through the documents in sequence:

1. RFI to understand the market and build a longlist.
2. RFP to a shortlist of vendors, scored against weighted criteria.
3. Presentations or demos for the finalists.
4. Negotiation or best and final offer, sometimes followed by an RFQ for specific line items such as additional licenses or hardware.

Not every purchase uses all three. A buyer replacing a known product may go straight to an RFQ. A buyer with an urgent, well-understood problem may skip the RFI. Some buyers merge the RFI and RFP into a single document, which makes it more important to read the evaluation criteria carefully.

Which document should a buyer send?

If you sit on the buying side, three questions decide the document:

• Can you describe the solution you want? If not, send an RFI. You need the market to show you the options before you can write requirements.
• Can you describe the problem, but not the best way to solve it? Send an RFP. You want vendors to compete on approach, team, and value, not only on price.
• Can you write a specification precise enough that any compliant supplier delivers the same result? Send an RFQ. Price, delivery, and terms are then the fair basis for comparison.

The most common error is sending an RFQ for a requirement that is not fully defined. Suppliers price different interpretations of the same request, the cheapest quote wins, and the gap between what was bought and what was needed appears after the contract is signed. The reverse error is costly too: an RFP for a commodity item asks vendors to write proposals no one needs to read.

Whichever document you send, publish the evaluation basis. Vendors who know how they will be scored send responses that are faster to compare.

How to write an RFI response

An RFI response is your audition for the RFP. It is short compared with a proposal, but buyers use it to decide who gets invited to the stage that matters.

Answer the questions asked, in the order asked. RFIs are often compared side by side in a spreadsheet. A response that follows the buyer’s numbering is easier to score.

Show you understand the problem. Open with a short paragraph that restates the buyer’s situation in their terms. Buyers in the research stage are looking for vendors who see the problem clearly.

Be specific about fit and limits. Say which parts of the requirement you cover fully, which you cover with a partner, and which you do not cover. Honest scoping at RFI stage builds credibility for the RFP.

Keep pricing indicative. Give a pricing model and a range when asked, and state the assumptions behind it. Do not commit to a figure before the requirement is defined.

Ask a clarifying question. If the RFI process allows questions, use them. A good question shows expertise and often shapes the requirements that appear in the RFP.

Write for forwarding. The person who reads your RFI response will forward it to colleagues. A clear structure and a short summary at the top help your answer travel.

A short RFI response structure

When the RFI does not prescribe a format, this order works:

1. Summary: three or four sentences on the buyer’s problem and how you address it.
2. Company overview: size, sector focus, and the experience relevant to this requirement.
3. Answers to the RFI questions: numbered to match the buyer’s document.
4. Approach and timeline: how a typical implementation runs, with the dependencies on the buyer’s side.
5. Security and compliance: the certifications and controls the buyer’s IT and legal teams will ask about.
6. Indicative pricing: the pricing model, a range if requested, and the assumptions behind it.
7. Contact: one named person for follow-up questions.

Keep it shorter than a proposal. An RFI response that reads like a full RFP answer suggests you did not read the request and makes the buyer work harder to compare vendors.

How vendors should respond at each stage

The right level of effort rises with the buyer’s commitment:

• RFI: concise, accurate, and focused on fit. The goal is the shortlist.
• RFP: a full proposal with a strong executive summary, a compliance matrix, evidence for every claim, and a cover letter that frames the response around the buyer’s objective. Decide first whether the opportunity is worth pursuing; our guide on how to win a contract bid covers the bid/no-bid decision.
• RFQ: precise, complete pricing on the buyer’s form, with clear validity, delivery, and terms. Accuracy matters more than presentation.

Across all three, the format affects how your answer is read. Evaluators jump between sections, forward documents to colleagues, and return to them days later. A response delivered as a secure microsite gives them a navigable structure and tells your team which sections each reviewer opened, so your follow-up addresses what they actually read.

Match the response to the request

Read the document’s name, then read its evaluation section. Together they tell you whether the buyer is exploring, selecting, or buying, and how much your response needs to prove.

Ready to send RFI and RFP responses you can track after submission? Request a demo.