RFP vs RFQ vs IFB: What's the Difference?

Here's the short version. An IFB (Invitation for Bid) is a sealed price competition where the lowest responsive bidder wins. An RFP (Request for Proposals) is a competition where price matters but so do your approach, experience, and qualifications. An RFQ (Request for Quotes) is usually a quick, informal price check for smaller purchases. Same government buyer, three different games. If you respond to an RFP like it's an IFB, or vice versa, you'll lose bids you should have won.

Let's take them one at a time.

What's an IFB?

IFB stands for Invitation for Bid. Some agencies call it an ITB (Invitation to Bid). Same thing.

This is the classic sealed bid process. The agency writes exact specifications for what it wants: this much asphalt, this thickness, this schedule. You submit a price in a sealed envelope or through a locked portal. At the deadline, they open all the bids, usually in public, and read the numbers out loud. Lowest responsive, responsible bidder wins.

"Responsive" means your bid followed the rules and included everything they asked for. "Responsible" means you're actually capable of doing the work. But there's no scoring of your beautiful cover letter, because there is no cover letter. Nobody's evaluating your approach. The agency already decided exactly what it wants. Your job is to price it.

Two things follow from that. First, your price is everything, so estimate carefully. Second, the paperwork rules are strict and unforgiving. If we've written it once we've written it a hundred times: read every form requirement twice. We cover the sealed part of the process in more detail in What Does "Sealed Bid" Mean?.

Agencies use IFBs when the work can be fully specified up front. Construction, paving, supplies, equipment. If they can describe it precisely, they can bid it on price alone.

What's an RFP?

RFP stands for Request for Proposals. This is what agencies use when they can't just spec the thing and pick the cheapest number. Think consulting, software, engineering design, janitorial services with quality standards, anything where how you do the work matters as much as what you charge.

With an RFP, you submit a proposal, not just a price. You describe your approach, your team, your past projects, your timeline. The agency scores proposals against published evaluation criteria. Price is one factor, often weighted at 20 to 40 percent, but the exact weights are in the solicitation. Read them. If experience is worth 30 points and price is worth 20, you now know where to spend your effort.

The winner of an RFP is usually the highest-scoring proposal, not the lowest price. Sometimes agencies shortlist the top scorers, hold interviews, then negotiate with the top firm. That negotiation step is a real difference from an IFB, where there's no negotiating at all. If you want to see how scoring actually plays out behind the scenes, read How Government Bid Evaluation Actually Works.

One blunt tip: on an RFP, answer the questions they asked, in the order they asked them, using their headings. Evaluators score with a checklist. Make their job easy and you'll score better than a fancier proposal that made them hunt.

What's an RFQ?

Here's where the acronym soup gets messy, because RFQ means two different things depending on the agency.

Most of the time, RFQ means Request for Quotes. It's an informal price request for smaller, simpler purchases that fall under the agency's formal bidding threshold. Thresholds vary a lot by state and agency, so don't assume. The buyer might email three or four vendors, or post the RFQ publicly, and ask for a quote on 40 laptops or a fence repair. Less paperwork, faster turnaround, and usually the low quote wins. These are great for new vendors because the barrier to entry is low and the buyer relationships you build can pay off later.

Sometimes, though, RFQ means Request for Qualifications. This one is common in architecture and engineering, where many states require qualifications-based selection. You submit your firm's credentials and experience with no price at all. The agency ranks firms on qualifications, then negotiates a fee with the top-ranked firm. If they can't agree, they move to the next firm.

How do you tell which RFQ you're looking at? Open the document. If it asks for a price, it's quotes. If it asks for resumes and project history and specifically says not to include pricing, it's qualifications. Takes two minutes and saves you from an embarrassing submission.

Which one will you see most often?

Depends on your trade. Construction and supplies vendors live in IFB territory. Service and technology firms see mostly RFPs. Everybody sees RFQs for small stuff, and honestly, small RFQs are an underrated way to get your first government win. See How to Bid on Government Contracts: A Beginner's Guide if you're starting from zero.

One warning: don't rely on the label alone. Some agencies are sloppy with terminology. We've seen "RFPs" that were pure low-bid price competitions and "bids" that had scoring criteria. The document controls, not the title. Always check three things: what you have to submit, how the winner is selected, and whether negotiation is allowed.

Quick side-by-side

• IFB: exact specs, sealed price, lowest responsive bid wins, no negotiation.
• RFP: proposal plus price, scored on multiple criteria, best value wins, negotiation possible.
• RFQ (quotes): informal pricing for smaller purchases, usually low quote wins.
• RFQ (qualifications): credentials only, no price, common for A/E work.

Does the type change how you should bid?

Yes, completely. On an IFB, sharpen your pencil and triple-check the forms, because a tight price with a missing signature is a rejected bid. On an RFP, budget real writing time and mirror the evaluation criteria, because a mediocre proposal at a great price still loses to a great proposal at a decent price. On an RFQ, respond fast. Quotes are often first-come, low-price wins, and buyers remember vendors who turn quotes around same day.

The other thing the type tells you is how much effort a given opportunity deserves. A 60-page RFP response for a contract you have a 10 percent shot at might not be worth it. A one-page quote almost always is.

Want to see real examples of all three? GovBids Pro aggregates 100,000+ open bids from cities, counties, school districts, and states across all 50 states, and you can search by keyword to compare how different agencies structure them. Browse what's open in your state at govbidspro.com (state hubs like govbidspro.com/states/tx), or set up a free email alert so new solicitations in your line of work land in your inbox.