Public tender bidding: a practical guide for suppliers

A public tender is a public buyer's formal invitation to suppliers to submit offers for a contract, run under published procurement rules. Bidding has five phases - finding and screening, compliance, submission, clarifications, and evaluation and award - and each has its own ways to lose an otherwise good bid. This guide answers each phase briefly and links a detailed article.

Last updated 15 September 2026 5 min read

General guidance, not legal advice. Public procurement rules differ by country, by buyer and by procedure, and the tender documents and the law that governs them decide. Where a guide cites a rule, it names the jurisdiction and links the official text.

What a public tender is

A public tender is a formal invitation from a public buyer, such as a ministry, a municipality, a hospital or an agency, to submit offers for a contract. The buyer is called the contracting authority in the EU and the UK, and the agency in US federal procurement. The invitation arrives as a notice on a procurement portal plus a set of procurement documents, often called an invitation to tender (ITT), a request for proposal (RFP) or a request for quotation (RFQ). What the supplier sends back is its tender, bid or proposal: the words vary by country and procedure, the idea does not.

Selling to a public buyer differs from selling to a company in one decisive way: the buyer has to follow published rules. In the EU, contracting authorities must treat bidders equally and without discrimination and act in a transparent and proportionate manner (Directive 2014/24/EU, Article 18). The rules protect bidders, and they also make the process unforgiving: a missed requirement or a late upload can rarely be put right afterwards.

The rules these guides refer to

Procurement law is national, and much of it applies only above value thresholds. These guides name the jurisdiction every time they cite a rule, and they draw on three systems:

Jurisdiction	Main rules	Where to read them
European Union	Directive 2014/24/EU on public procurement, which each member state implements in national law and which applies to contracts at or above the value thresholds in its Article 4; Directive 89/665/EEC on review procedures	Directive 2014/24/EU and Directive 89/665/EEC on EUR-Lex
United Kingdom	Procurement Act 2023, in force since 24 February 2025	Procurement Act 2023 on legislation.gov.uk
United States	Federal Acquisition Regulation (FAR), for federal executive agencies; states and cities have their own rules	acquisition.gov, linked section by section in each guide

Other countries have their own procurement laws. The principles in these guides are widely shared; the details, deadlines and remedies are not, so the tender documents and the law named in them always decide.

Phase 1: Finding and screening

The first job is to find the notices at all, and the second is to decide quickly which ones deserve a bid. A bid costs days or weeks of work, so the most valuable decision is often a fast, well-founded no.

Searches built on your own vocabulary and one classification code miss much of the market. See Why keyword and CPV searches miss relevant tenders.
Some tenders are written around one supplier. See How to spot a tender that is already decided.
Screening dozens of notices a day is where software helps. In Tender Navigator a filter picks up the new notices that match your criteria, and an AI prompt holding your go or no-go rules gives each one a verdict with its reasoning.

Phase 2: Compliance and eligibility

Before an offer is scored, the buyer checks whether the supplier may bid at all and whether the bid is complete: grounds for exclusion, minimum requirements on turnover, insurance, certifications and experience, and the mandatory parts of the response. Failing one of them usually ends the bid, however good the rest is.

Can one missed mandatory requirement disqualify a bid?
Too small to meet a requirement alone? Consortia, joint ventures and subcontracting in tenders

Phase 3: Submission

Most tenders are submitted through an electronic portal against a fixed deadline, and the portal's clock decides. Bidders report that a problem in the final hour is, in practice, the bidder's risk. See Tender deadlines, late submissions and portal outages.

Phase 4: Clarifications

While a tender is open, bidders can put questions to the buyer. The answers usually go to every bidder, so a question needs careful wording, and an answer that seems to change the documents needs to be confirmed formally. See Clarification questions in public tenders.

Phase 5: Evaluation, award and after

Compliant tenders are scored against the award criteria published in the documents, often a mix of price and quality with stated weightings. The decision is then notified; in the EU and the UK a short standstill period normally runs before the contract is signed, and unsuccessful bidders can find out why they lost.

A go or no-go checklist

Before committing a team to a bid, answer these from the notice and the documents:

Fit. Is this the work you do, at a size you can deliver?
Eligibility. Do you meet every exclusion and selection requirement, alone or with partners?
Mandatory elements. Can you provide every required document, certificate and form by the deadline?
Time. Is there enough time to write a competitive response, including the time to ask and wait for clarifications?
Competition. Is the specification open, or written around another supplier?
Evaluation. Do the award criteria and their weightings reward what you are good at?
Commercials. Can you win at a price that still makes money?
Source check. Have you read the original notice and every published clarification at the source? Tender data and the original source explains why the portal's version always decides.

A "no" to any of the first three usually means no bid; the rest are judgement calls.

Key terms

The Public procurement glossary for suppliers defines the terms used across these guides, from award criteria to standstill period, and says which jurisdiction uses which word.