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How to Register as a Vendor in Massachusetts

Where
COMMBUYS (Operational Services Division)
Cost
Free ("vendors must set up a free profile in COMMBUYS")
How long
unknown (the state's job aid gives no approval time for the basic profile; the optional Small Business Purchasing Program check says "within 24-48 hours")
Last checked
2026-09-27

See 1,520 open bids in Massachusetts →

What it's for

COMMBUYS is the Commonwealth's official procurement system. State departments, and many cities, towns and schools, post their bids there. A free COMMBUYS vendor profile lets you get email bid notices that match what you sell and submit responses online.

Have this ready

  • Tax ID: FEIN (or SSN for a sole proprietor)
  • Legal business name exactly as it appears on your tax return, plus your address
  • One or more email addresses for bid notices (the job aid allows several)
  • At least one UNSPSC code for the goods or services you sell. Massachusetts uses UNSPSC, not NIGP.
  • The person who will be your "Seller Administrator," meaning the main account owner
  • Ownership type and full-time employee count, if you want to be checked for the Small Business Purchasing Program (SBPP)

Steps

  1. Go to www.commbuys.com and choose the Register link.
  2. Enter your Tax ID, company name and email address.
  3. Fill in the Company Information section. Required fields are marked with an asterisk.
  4. Answer the SBPP eligibility question. You can acknowledge it, disagree, or choose "not now." If you apply, the pre-qualification form asks for your tax ID type, principal place of business, legal name, EIN, ownership type, and whether you have 50 or fewer full-time employees.
  5. Set up the Seller Administrator login ID and password (8-50 characters, with at least one letter and one number).
  6. Add bid-notice email addresses under the bid mailing address.
  7. Pick your categories: business structure and business type are required.
  8. Add your UNSPSC commodity and service codes (at least one is required).
  9. Check the summary page and submit. You will get a confirmation email with your login and vendor number.
  10. Log in and change your password. The system requires this the first time you log in.

After you register

  • COMMBUYS emails you when a bid posted under your UNSPSC codes opens. Add more codes at any time so you don't miss bids.
  • You will be asked to change your password every 60 days.
  • The Seller Administrator can update the profile (contacts, codes, addresses) at any time. Keep it current.
  • OSD offers free vendor training. See the "OSD Vendor Training" page on mass.gov.

Watch out for

  • COMMBUYS is free. The job aid mentions an optional BidSync sign-up at the end. You don't need it to get COMMBUYS notices.
  • DCAMM building construction and designer bids (Chapter 149/149A) are also on COMMBUYS. However, contractors on these jobs often need separate DCAMM contractor certification. Check DCAMM's construction bidding page.
  • MassDOT highway work and quasi-public bodies such as the MBTA, MassDevelopment and MassHousing post bids on their own sites, not only on COMMBUYS.
  • Registering doesn't make you eligible for every contract. Read each bid's own requirements.

Certifications and bid preferences in Massachusetts

Standard bid forms for Massachusetts

These are the forms bidders are most often asked to sign or attach on Massachusetts 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.

Commonwealth Standard Contract Form (with contractor certifications)
Standard state contract signed by the vendor; includes the contractor's certification of tax compliance and other legal certifications.
When: All Massachusetts state contracts
Contractor Authorized Signatory Listing (CASL)
Lists who is authorized to sign contracts for your company; each year's version must be on file.
When: All state contracts
Request for Taxpayer Identification Number and Certification (W-9) (W-9)
Taxpayer ID form used to set you up as a state vendor and issue payments.
When: Before payment on state contracts
Commonwealth Terms and Conditions
Standard state legal terms that form part of the contract.
When: All state contracts
DCAMM Contractor Certificate of Eligibility
State prequalification certifying your capacity rating to bid on public vertical construction; required for general contractors and filed sub-bidders.
When: Public building construction projects estimated at $150,000 or more
Form for General Bid (with 5% bid deposit)
Sealed bid form for general contractors, submitted with a 5% bid deposit (bond, cash, certified or treasurer's check).
When: Chapter 149 public building construction bids
Form for Sub-Bid
Filed sub-bid for a specific trade, with 5% deposit and the sub-bidder's Certificate of Eligibility.
When: Filed sub-bid trades on Chapter 149 projects
Contractor Update Statement
Updates your DCAMM qualification information (not a public record) and must be fully completed with the bid.
When: Chapter 149 state building bids
MBE/WBE Schedule for Participation and Letters of Intent
Shows your minority- and women-owned business subcontracting plan; due within 5 working days of bid opening.
When: State construction bids with MBE/WBE goals
Standard Forms for General Contractor Prequalification (RFQ Form 1, Form 2 SOQ) (GC RFQ Form 1 and 2)
Interest form and Statement of Qualifications used to prequalify for projects bid under c.149 sec. 44D 1/2.
When: Projects using general contractor prequalification
Supplier Diversity Office (SDO) Certification
Free state certification as MBE, WBE, VBE or Portuguese-owned business, applied for in the SDO portal after an online webcast.
When: Optional; counts toward diversity goals
Certificate of Non-Collusion
Bidder certifies the bid was made in good faith without collusion (M.G.L. c.30B sec. 10).
When: Bids from local governments and under c.30B/c.149 (statewide requirement)
Certification of Tax Compliance
Certifies you have filed and paid state taxes (M.G.L. c.62C sec. 49A); part of the contract signing.
When: Public contracts, state and local
Weekly Certified Payroll Report and Statement of Compliance
Weekly payroll and signed compliance statement showing prevailing wages were paid, with apprentice ID cards.
When: Public construction subject to Massachusetts prevailing wage

Common questions

Is it free to register as a vendor in Massachusetts?

Free ("vendors must set up a free profile in COMMBUYS")

Where do I register to bid in Massachusetts?

COMMBUYS: https://www.commbuys.com/bso/

How long does Massachusetts vendor registration take?

unknown (the state's job aid gives no approval time for the basic profile; the optional Small Business Purchasing Program check says "within 24-48 hours")

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

Each bid lists its own forms. Ones bidders are commonly asked for include: Commonwealth Standard Contract Form (with contractor certifications); Contractor Authorized Signatory Listing (CASL); Request for Taxpayer Identification Number and Certification (W-9); Commonwealth Terms and Conditions; DCAMM Contractor Certificate of Eligibility. 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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