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Form W-9 - Mass 2026
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- Click ‘Get Form’ to open the Form W-9 - Mass in the editor.
- 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.
- Select the appropriate box that describes your entity type: Individual/Sole Proprietor, Corporation, Partnership, or Limited Liability Company. If applicable, specify your tax classification.
- Provide your address including street number, apartment or suite number, city, state, and ZIP code in the corresponding fields.
- 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.
- 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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