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How to Register as a Vendor in Wisconsin

Where
State of Wisconsin eSupplier Portal (bidder registration)
Cost
Free ("Registration on eSupplier is available free of charge")
How long
unknown
Last checked
2026-09-27

See 31 open bids in Wisconsin →

What it's for

Wisconsin's Department of Administration (DOA) says companies that want to do business with the state "must register on the eSupplier Portal for Bidders." Once you register and add NIGP codes, you get automatic emails for solicitations from state agencies and University of Wisconsin System campuses that match your codes, and you can submit responses online. VendorNet is still the free public place to browse bids.

Have this ready

  • An email address you check
  • Company information: legal name, address, and contacts
  • FEIN/EIN (or SSN for a sole proprietor) and a W-9 for when you're awarded work and need to be paid. The DOA bidder materials don't list these as registration fields.
  • NIGP codes for "the services and commodity areas your company is interested in providing" (you need at least one)

Steps

  1. Go to eSupplier (portal_url above). DOA also links a short bidder registration video.
  2. Create a WAMS username and password (Wisconsin's state login) using the link below the sign-in button.
  3. Sign in to eSupplier with your WAMS login.
  4. Choose Register and fill out the registration form with your company information.
  5. Add your NIGP codes so you get notices.
  6. To bid, open the solicitation while signed in. The FAQ says the response button only appears for registered, signed-in users.

If you were registered on the old VendorNet system, use the same email when you register on eSupplier. DOA says your previous NIGP codes will carry over if your account was active at the time of the move.

After you register

  • You'll get "automatic notifications by email for any solicitations issued by State agencies and University of Wisconsin System campuses" that match your codes.
  • Keep your NIGP codes and contacts up to date in eSupplier. DOA doesn't publish a renewal or expiration schedule.
  • Help: STAR Support (STARSupport@wisconsin.gov, 844-947-7827) for login problems, and the State Bureau of Procurement (DOAWisPro@wisconsin.gov, 608-264-7897) for bidding questions.

Watch out for

  • Two systems: state agencies now use eSupplier, but UW campuses and municipalities still post on VendorNet. Check VendorNet even after you register.
  • Construction is separate: state building projects (DOA's facilities division) are bid through WisBuild ("DOA Projects Out for Bid"). WisDOT highway lettings are posted separately by WisDOT. We haven't re-verified the current URLs for either.
  • Registration is free. You don't need a paid service to register or get notices.

Certifications and bid preferences in Wisconsin

Standard bid forms for Wisconsin

These are the forms bidders are most often asked to sign or attach on Wisconsin state bids. Each bid lists exactly which ones it needs, and many agencies attach their own copies, so always use the version in the bid documents when there is one.

eSupplier Bidder Registration (WAMS ID + NIGP codes)
Free online registration (WAMS login, bidder registration form and commodity codes) needed to see and respond to state solicitations electronically.
When: State agency bids and requests for proposals
Supplier Diversity Program Certification (MBE, WBE, DVB)
State certification as a minority-, woman- or service-disabled-veteran-owned business (51% ownership/control); DVB firms may get a 5% bid preference.
When: Optional; needed to claim diversity credit or the DVB preference on state contracts
Prequalification Statement (WisDOT) (DT1621)
Application to be prequalified by WisDOT before you can bid on highway construction; renewed every two years.
When: State highway construction bids (submit 10 business days before the letting)
Annual Bid Bond (WisDOT) (DT1304) Notarized
A one-year bid bond on file with WisDOT, with original signatures, seals and notary, due by 11:45 a.m. the day before the letting.
When: State highway construction bids
Bidder Proposal Request (BPRS) (DT1633)
Request to become a plan holder (approved bidder) on a WisDOT project, due by 11:45 a.m. the day before the letting.
When: State highway construction bids
Good Faith Effort Documentation (DBE) (DT1202)
Proof of your outreach to Disadvantaged Business Enterprises, required when you do not meet the DBE goal.
When: WisDOT federally funded bids with a DBE goal that you do not meet

Common questions

Is it free to register as a vendor in Wisconsin?

Free ("Registration on eSupplier is available free of charge")

Where do I register to bid in Wisconsin?

State of Wisconsin eSupplier Portal: https://esupplier.wi.gov

How long does Wisconsin vendor registration take?

unknown

What forms do I need to bid on Wisconsin state contracts?

Each bid lists its own forms. Ones bidders are commonly asked for include: eSupplier Bidder Registration (WAMS ID + NIGP codes); Supplier Diversity Program Certification (MBE, WBE, DVB); Prequalification Statement (WisDOT); Annual Bid Bond (WisDOT); Bidder Proposal Request (BPRS). The full list with links to the official blank forms is on this page.

Sources

FindMyBids isn't affiliated with any government agency. Registration is free or low cost on official sites; you don't need to pay a third party. Always follow the official portal's instructions.

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