Your personal exemption. In order to claim an exemption from sales tax on purchases in MA, a copy of the Certificate of Exemption.If the allowable Massachusetts withholding exemptions are the same as being claimed for federal income tax purposes, the employee should complete Form W-4 only. Identify the items that qualify for tax exemption. Tax-exempt organizations making pur- chases for other than resale are to use Form ST-5, Exempt Pur- chaser Certificate. 2. If you are exempt from paying Mass State Taxes, please fill out this form and return it to: Name: Last. First. The Assessing Department is pleased to present the Annual Exempt Organization Forms (State Tax Form 3ABC) as an online form. No forms are required for exemption from occupany excise tax for either IBAs or CBAs. Every organization seeking exemption pursuant to M.G.L. c. Attached below is your Certificate of Exemption (Form ST-2).