When filling out a W-9 form, you will not attach any documents to the form itself. However, the information provided on your W-9 form may require you to gather some supporting documents. Here are a few key documents you might need when completing your W-9 form:
1. Social Security Number (SSN) or Employer Identification Number (EIN): You will need to provide either your individual SSN or your business's EIN, depending on whether you are an individual or a business entity.
2. Identification documents: It is always a good idea to have a valid government-issued identification document, such as a driver's license or passport, readily available when filling out your W-9 form. Though you won't physically attach these to the form, you may need the information on them.
3. Business entity documents (if applicable): If you are completing the W-9 form on behalf of a business or other legal entity, you may require additional documents, such as articles of incorporation or proof of partnership, to verify the legitimacy of your business.
4. Taxpayer identification documents: If you are a foreign person subject to withholding, you may need to attach additional documentation, such as a Form W-8, to establish your foreign status.
It is important to note that while you won't attach any documents to the actual W-9 form, the information you provide must be accurate and supported by reliable documents. Depending on your specific circumstances, additional documents may be required, so it is always advisable to consult the instructions accompanying the W-9 form or seek professional advice for your particular situation.