The purpose of Tax Form W-4 is simple ― it is used by your employer to withhold the proper amount of federal income tax from your paycheck. The IRS recommends that employees submit a new W-4 tax form each year, or any time their personal or financial situation changes. Of course, this is required upon being hired.
The Employment Eligibility Verification Form I-9 is a U.S. Citizenship and Immigration Services form. It is used by an employer to verify an employee's identity and to establish that the worker is eligible to accept employment in the United States
When a business pays an independent contractor $600 or more over the course of a tax year, it is required to report these payments to the IRS on an information return called form 1099-MISC. Businesses use the name, address and Social Security or tax identification number form W-9 to complete form 1099-MISC.
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