Form ST-5 at a glance
What it is: Form ST-5 is the Sales Tax Exempt Purchaser Certificate of the Massachusetts Department of Revenue.
Who signs: Any person, group or organization purchasing as an agent on behalf of a 501(c)(3) organization must certify that it is doing so by presenting to the vendor a properly completed Form ST-5 signed by the 501(c)(3) organization.
A filled-in Form ST-5 example: a school completes the certificate for one purchase

How to fill out Form ST-5, box by box
Part 1. Exempt taxpayer information

Part 1, Exempt taxpayer information, is to be completed by exempt government or 501(c)(3) organization.
Enter the Name, the Address, the City State Zip and the Exemption number.
Enter the Issue date and the Date of expiration of certificate.
Certification is made that the organization named under Name is an exempt purchaser under Massachusetts General Laws, Chapter 64H, sections 6(d) or 6(e). All purchases of tangible personal property or services by this organization are exempt from taxation under said chapter to the extent that such property or services are used in the conduct of the business of the purchaser. Any abuse or misuse of this certificate by any tax-exempt organization or any unauthorized use of this certificate by any individual constitutes a serious violation and will lead to revocation.
Sign under Signature, and enter Title and Date.
Willful misuse of this certificate may result in criminal tax evasion sanctions of up to one year in prison and $10,000 ($50,000 for corporations) in fines. (checked November 8, 2026)
Part 2. Agent information

Part 2, Agent information, is to be completed by agent of exempt government or 501(c)(3) organization.
Enter the Name of agent's organization, the Address and the City State Zip.
Enter the Agent's name, the Address and the City State Zip.
Certify that in making this purchase, you are acting as an agent for the exempt organization named under Name (select one).
Government organization (local public school, city/town government, state agency, etc.): attach Form ST-2, if available. If Form ST-2 is not available, enter exemption number, if known. 501(c)(3) organization (parochial school, Scout troop, etc.): Form ST-2 must be attached.
Under Signature, sign, and enter the Title and the Date.
Part 3. Vendor information
More rules for Form ST-5
If you have any questions about completing this certificate, please contact: Massachusetts Department of Revenue, Customer Service Bureau, 200 Arlington Street, Chelsea, MA 02150; (617) 887-6367.
If your situation is different
You are a 501(c)(3) organization
An exempt 501(c)(3) organization must have obtained a Certificate of Exemption (Form ST-2) from the Commissioner of Revenue certifying that it is entitled to exemption under G.L. c.64H, §6(e).
You are an exempt government organization
The exempt government organization is encouraged to submit to the vendor a properly completed Sales Tax Exempt Purchaser Certificate (Form ST-5) with a copy of its Form ST-2 attached.
You are an agent for an exempt government organization
The agent must complete Part 2 when acting on behalf of the exempt government organization.
If Part 1 is not completed by the exempt government organization, the agent must enter the name, address, and, if available, the exemption number of the government organization on whose behalf the purchases are being made.
Also enter a description of the property purchased into Part 4.
You are an agent for a 501(c)(3) organization
The agent of the exempt 501(c)(3) organization must complete Part 2 of Form ST-5.
Common questions about Form ST-5
What is an ST-5 form in Massachusetts?
Form ST-5 is the Sales Tax Exempt Purchaser Certificate of the Massachusetts Department of Revenue. This form is approved by the Commissioner of Revenue and may be reproduced.
Where do I file it?
The 501(c)(3) organization must submit to the vendor a properly completed Sales Tax Exempt Purchaser Certificate (Form ST-5) signed by the 501(c)(3) organization with a copy of its Form ST-2 attached.
Sources
[1] Form ST-5 (Rev. 6/09), Sales Tax Exempt Purchaser Certificate, Massachusetts Department of Revenue (the Official source link on this page).


