Is an RFP legally binding?

Mostly no for the buyer, and often yes for you. An RFP asks suppliers for offers and leaves the buyer free to choose among them, or to choose none. Your response is different. Once it states a price and answers the buyer's terms, it works as an offer, and it can bind you at two points: before award, for as long as the tender's validity terms and the governing law hold it open, and after award, when the contract takes it in as one of its documents. That is what the bid manager's sign-off commits the organisation to. Four conditions decide how far the commitment reaches, and none of them replaces your legal team's view of a specific tender.

When the tender documents set a validity period

The tender documents themselves can set how long you are held to your response from the submission deadline, and what withdrawing would cost you. The buyer sets these terms, and they differ from one tender to the next, so the only reliable answer is what the instructions you're responding to say.

The European Commission's instructions to tenderers on its Funding & Tenders Portal show how far they can go. Bidders are bound by their bids for 90 days from the submission deadline, and they may not withdraw between the deadline and the end of that period. In exceptional cases, the Commission may ask bidders to extend the period. The successful bidder stays bound for a further 60 days, and a bidder that withdraws can forfeit its tender guarantee. That is one buyer's document, not a rule of law, but it shows the shape to look for.

Three things follow for sign-off. The clock starts at the deadline, not at your upload, so the date that matters is the deadline plus the validity period plus whatever the winner owes on top. Under the Commission's terms, that is up to 150 days for the winning bidder, before any extension. Every price, named team member and delivery date in the response has to still be true on that last day. An extension request deserves the same sign-off as the original submission, because agreeing to it renews the commitment longer than the business planned.

When the governing law holds you to your offer

Alongside the tender's own terms, the contract law governing the tender decides whether you can withdraw your offer before the buyer accepts it. There is no single body of RFP law to look up.

In France, the Civil Code says an offer may not be withdrawn before the end of the period the offeror fixed, or a reasonable period where none was fixed. A response that states a validity period therefore binds the bidder for that period.

In Germany, section 145 of the Civil Code binds a person who offers to enter into a contract to that offer, unless they have ruled out its binding effect.

Read these positions together with the tender's own terms, which can still attach a cost to withdrawing, as the forfeitable guarantee in the Commission's terms shows. Read the French and German positions as the default: there, you can be held even when the tender says nothing about withdrawal.

So the practical question is which law governs. Find the governing law clause in the tender or the draft contract before drafting starts, not at final review. Where it names a law your team doesn't usually work under, bring legal in at that point with two questions: can we withdraw before award, and what would withdrawing cost us under these terms?

When the procurement is public

Public procurement rules bind the buyer to its process, not to an award, so you can stay held by your bid while the buyer stays free to award nothing. That imbalance is the point to carry into sign-off.

The Procurement Act 2023, which applies in England, Wales and Northern Ireland, says a contracting authority may award a public contract to the supplier with the most advantageous bid. It doesn't say it must. If the authority decides not to award after publishing a tender or transparency notice, it has to give notice of that decision as soon as reasonably practicable. The Act also requires a competitive tendering procedure to run in accordance with the tender notice and any associated tender documents, so you must follow the validity and withdrawal terms in those documents.

In EU member states, through the national rules that transpose it, Article 56(1) of Directive 2014/24/EU lets a contracting authority award only once it has verified that the bid complies with the requirements, conditions and criteria in the contract notice and the procurement documents. That makes a reservation on the buyer's terms a risk to the bid rather than a negotiating position. A response that qualifies a condition can give the authority grounds to find it non-compliant.

To see where award and no-award decisions sit in the sequence, see the stages of a public tender from the supplier's side.

After award, when your response becomes the contract

Once you win, your response can become part of the RFP contract that follows, and what it promised turns from a scored answer into an obligation you deliver. How it enters the contract, and how much weight it carries there, depends on the contract the buyer chose.

Two UK government contract documents show both sides. Cabinet Office guidance on the Model Services Contract says the supplier's solution is incorporated into the contract in Schedule 8 (Supplier Solution). The 2025 guidance for authorities adds that the same schedule should include a record of the supplier's social value bid. Under that model contract, the solution a bid team writes to score well, and the record of its social value bid, are meant to become part of a contract schedule.

Ranking matters as much as inclusion. In one order form under the Crown Commercial Service's Technology Services 3 framework (RM6100), dated 25 June 2025, the order of precedence carves Framework Schedule 18 (Tender) out of the top rank and lists it last. The bid is part of the contract, but where it conflicts with the buyer's terms, the buyer's terms win. That is one contract's wording, not a rule of law, and other contracts rank their documents differently.

Together, these two points can work against the bidder. A caveat you wrote to limit a promise can lose out to the buyer's term it contradicts. For what the awarded contract is and how it relates to the tender documents, see tender contract.

What to check before you sign off a response

Sign off a response only once you know what it commits the organisation to, how long that lasts and what it becomes after award. The questions below work as a check at final review, once per bid, with each answered from the tender documents or the draft contract rather than from memory of the last bid.

1. Validity end date. What is the last day the buyer can accept: the submission deadline, plus the validity period, plus any extension the buyer may ask for, plus any extra period the winner owes? Judged once, as a date on the plan.
2. Withdrawal. Do the documents bar withdrawal inside the period, and is there a tender guarantee you could forfeit? Judged once.
3. Governing law. Which law do the tender and the draft contract name, and does it hold an offer open, as French and German law do? Judged once. If it is a law your team doesn't usually work under, legal reviews before sign-off.
4. Acceptance of terms. Does submitting accept the buyer's terms, and does the response qualify any of them? Judged per reservation: each one is removed or raised with the buyer before the deadline.
5. Contract schedule and precedence. Which schedule will the response sit in, and where does it rank against the buyer's terms? Judged once, from the draft contract.
6. Deliverability. Can each price, staffing commitment, delivery date and social value commitment be held until the validity end date and delivered for the contract term? Judge each commitment, with a named business owner. Prices you rely on from subcontractors or consortium partners have to stay valid as long as yours.

The decision rule is short. Sign off when every question has an answer and every commitment under item 6 can be held to the validity end date. Where the documents leave a question open, raise a clarification question before the clarification deadline rather than writing a reservation into the response, and word it with care, because how you ask can matter as much as asking.

These checks belong in the wider sequence of running an RFP response. In SEQUESTO aOS, Agent Force's specialist agents pull every dated requirement into the tender timeline, and James adds your sign-off stage as a milestone with a named reviewer, so the dates and the sign-off sit on the plan from day one.

On your next bid, put the validity end date on the plan before drafting starts, and take these six questions into final review.