Illinois buys through a central state purchasing office, and its cities, counties and school districts buy on their own as well. To sell to the state you register once as a vendor, then watch for solicitations in your commodity codes and respond by the deadline. This page covers the state registration steps, where bids are posted and the programs that help small businesses, with links to the official pages.

Central purchasing officeChief Procurement Office for General Services (CPO-GS), with the Department of Central Management Services (CMS)
Vendor registrationBidBuy (eProcurement system), used together with the Illinois Procurement Gateway (IPG)
Registration feeFree (BidBuy states there is no charge for vendors to register)
Where bids are postedBidBuy, the eProcurement system and procurement bulletin for procurements under the Chief Procurement Officer for General Services, via its Open Bids feature at https://www.bidbuy.illinois.gov/bso/
Open bids right now492 open Illinois bids (94 closing this week, 190 new in the last 7 days)

How to register as a Illinois vendor

  1. Register the business with the Illinois Secretary of State as a legal entity in good standing.
  2. Register with the Illinois State Board of Elections if aggregate bids or contracts will exceed $50,000 a year.
  3. Obtain an Illinois Department of Human Rights eligibility number by filing the Employer Report Form (PC-1).
  4. Register in the Illinois Procurement Gateway (ipg.illinois.gov) and submit the Active Registered Vendor Disclosure form.
  5. Complete the BidBuy registration; an account is created automatically for IPG-registered vendors, allow 24 to 48 hours for it to appear.
  6. Use BidBuy to receive bid notifications, view open bids, and submit quotes and proposals.

Registration gets you on the state's list, but it rarely sends you every relevant bid. Many agencies, and most local governments, post on their own portals. A free BidsNexus alert watches the state portal and Illinois's local agencies for you and emails the matches each morning.

Small business and certification programs

  • Business Enterprise Program (BEP): For minority-, women-, and disability-owned businesses; the state goal is 30% of state contracts to qualified BEP businesses.
  • Veterans Business Program (VBP): Assists veteran-owned and service-disabled veteran-owned businesses.
  • Small Business Set-Aside Program (SBSP): Independently owned businesses under size limits (for example wholesale up to $13 million and retail up to $8 million in annual sales) apply through IPG; agencies set aside purchases under $100,000 and 600+ designated categories for them.

Federal set-asides work differently from state programs; see our guide to small business set-asides.

Cities, counties and school districts

Units of local government and qualified not-for-profit agencies can buy from state joint purchase master contracts under the Unified Procurement Program without registering, as long as they meet the Governmental Joint Purchasing Act definition. The official pages checked do not name a shared portal that local governments use for their own solicitations.

Local bids are where most small businesses win their first contracts: smaller dollar values, shorter responses and less competition from national firms. BidsNexus collects them into one list, so you can browse every open Illinois bid in one place.

Tips specific to Illinois

  • Registering in IPG first creates the BidBuy account automatically; allow 24 to 48 hours for it to show up.
  • State Board of Elections registration is needed once aggregate bids or contracts exceed $50,000 in a year.
  • SBSP-certified vendors compete in a restricted pool for purchases under $100,000 and for 600+ designated NIGP categories.
  • BidBuy Vendor Help Desk: il.bidbuy@illinois.gov or 866-455-2897.

Open Illinois bids with upcoming deadlines

START AN INTERNET SERVICE WITH A MINIMUM OF 1 GIG UP AND DOWNLOAD SPEEDS TO MD RFP · Due Oct 5, 2026 AMEND 0001: PROVIDE, INSTALL, AND MAINTAIN A 10GB ETHERNET PT TO PT SERVICE BETWEEN TX AND TX. RFP · Due Oct 5, 2026 REAWARD A COMMERCIAL BUSINESS LINE (CBL) SERVICE AT NEWPORT, RI RFP · Due Oct 5, 2026 Rebid of Supplemental Snow Removal Labor Services SOLICITATION · Due Oct 5, 2026 FY27- SP- Chicago Read Doors & Locks Maintenance SOLICITATION · Due Oct 5, 2026 708 Rockwood Dr SOLICITATION · Due Oct 5, 2026 Education Center Test Administrator at Scott AFB, IL RFP · Due Oct 5, 2026 Efax Solutions SOLICITATION · Due Oct 5, 2026

See all 492 open Illinois bids →

What Illinois agencies are buying

Open Illinois bids on BidsNexus right now, by category:

Next steps

  1. Register with the state (above) and, for federal work, in SAM.gov.
  2. Find your NAICS codes so you're matched to the right solicitations.
  3. Learn how to read an RFP quickly and make a bid/no-bid decision.
  4. Set up a free daily alert for Illinois in your categories.
Get Illinois bids by email. Tell us your NAICS codes or what you sell, and BidsNexus emails the matching Illinois bids every morning. Free.
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Sources

Checked against the state's official pages on September 23, 2026. Rules and portals change, so confirm details on the official site before you register or bid.
https://cms.illinois.gov/business/procurement/how-to-do-business.html
https://www.bidbuy.illinois.gov/bso/
https://pathway2procurement.illinois.gov/bidbuy.html
https://cpo-general.illinois.gov/sell-2-illinois.html
https://cpo-general.illinois.gov/cpo-notice-2018-09-document.html