Who Needs to Fill Out a W-9?
A W-9, also known as a Request for Taxpayer Identification Number and Certification, is a form used by the Internal Revenue Service (IRS) to collect information from taxpayers. But who exactly needs to fill out a W-9? The answer lies in the tax laws and regulations that govern various business and employment relationships.
Independent Contractors and Freelancers
One of the most common reasons individuals need to fill out a W-9 is when they are classified as independent contractors or freelancers. This includes individuals who provide services to clients on a project-by-project basis, such as writers, designers, consultants, and contractors. When an independent contractor starts working for a client, they may be required to provide a W-9 to the client or their accounting department to obtain a Taxpayer Identification Number (TIN) and to certify their taxpayer status.
What is a TIN?
A TIN is a unique number assigned to each taxpayer by the IRS. It is used to track taxpayer identity and income information. A TIN can be a Social Security number, Employer Identification Number (EIN), or Individual Taxpayer Identification Number (ITIN), among others. When filling out a W-9, the individual must provide their TIN to the requester, usually the client or their accounting department.
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Employees of Tax-Exempt Organizations
Another group that may need to fill out a W-9 are employees of tax-exempt organizations, such as charities, non-profits, and government agencies. These organizations may require employees to provide a W-9 to report their income and withhold the proper amount of taxes. This is because tax-exempt organizations are exempt from paying federal income taxes, but their employees may still be required to pay taxes on their earnings.
What is a Substitute W-9?
Some organizations may use a Substitute W-9, also known as a W-9S, which is a shorter version of the standard W-9 form. The Substitute W-9 is used for situations where the taxpayer's name and taxpayer identification number are already known by the requester. This includes situations where an individual is already on a payroll and the requester only needs to confirm their TIN and other information.
Non-U.S. Citizens and Residents
Non-U.S. citizens and residents who are working in the United States may also need to fill out a W-9. This includes individuals who are temporarily working in the United States or those who have a TIN but are not U.S. citizens or residents. In these situations, the individual must provide their TIN and certify their taxpayer status on the W-9 form.

Who is Exempt from Filling Out a W-9?
Not everyone needs to fill out a W-9. Some individuals may be exempt from doing so, including:
- U.S. citizens and residents who are not independent contractors or freelancers.
- Employees of for-profit businesses, unless they are classified as independent contractors.
- Individuals who are not required to file a tax return or do not have a TIN.
Conclusion
In summary, a W-9 is a critical form used by the IRS to collect information from taxpayers. Various individuals and organizations may need to fill out a W-9, including independent contractors, employees of tax-exempt organizations, non-U.S. citizens and residents, and others. By understanding who needs to fill out a W-9, individuals and organizations can ensure compliance with tax laws and regulations.