Form W-9 - Mass 2026

1. Click ‘Get Form’ to open the Form W-9 - Mass in the editor.
2. Begin by entering your name as it appears on your income tax return in the designated field. If you have a business name, include that as well.
3. Select the appropriate box that describes your entity type: Individual/Sole Proprietor, Corporation, Partnership, or Limited Liability Company. If applicable, specify your tax classification.
4. Provide your address including street number, apartment or suite number, city, state, and ZIP code in the corresponding fields.
5. In Part I, enter your Taxpayer Identification Number (TIN). For individuals, this is typically your Social Security Number (SSN). Ensure this matches the name provided to avoid backup withholding.
6. In Part II, certify under penalties of perjury by checking the relevant statements regarding backup withholding and citizenship status. Sign and date the form at the bottom.

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