The determination is complex, but is essentially made by examining the right to control how, when, and where the person performs services. It is not based on how the person is paid, how often the person is paid, or whether the person works part-time or full-time. There are three basic areas which determine employment status:
relationship of the parties For more information on employer-employee relationships, refer to Chapter 2 of Publication 15, Circular E, Employer's Tax Guide and Chapter 2 of Publication 15-A (PDF), Employer's Supplemental Tax Guide. If you would like the IRS to determine whether services are performed as an employee or independent contractor, you may submit Form SS-8 (PDF), Determination of Worker Status for Purposes of Federal Employment Taxes and Income Tax Withholding.
Unless you think you were an employee, you should report your nonemployee compensation on Form 1040, Schedule C (PDF), Profit or Loss from Business (Sole Proprietorship), or Form 1040, Schedule C-EZ (PDF), Net Profit From Business. You also need to complete Form 1040, Schedule SE (PDF), Self-Employment Tax, and pay self-employment tax on your net earnings from self-employment, if you had net earnings from self-employment of $400 or more. This is the method by which self-employed persons pay into the social security and Medicare trust funds.
Generally, there are no tax withholdings on this income. Thus, you may have been subject to the requirement to make quarterly estimated tax payments. If you did not make timely estimated tax payments, you may be assessed a penalty for an underpayment of estimated tax. Employees pay into the social security and Medicare trust funds, as well as income tax withholding, through payroll deductions.
If you are not sure whether you are an independent contractor or an employee, complete Form SS-8 (PDF), Determination of Employee Work Status for Purposes of Federal Employment Taxes and Income Tax Withholding. For more information on employer-employee relationships, refer to Chapter 2 of Publication 15, Circular E, Employer's Tax Guide, and Chapter 2 of Publication 15-A (PDF), Employer's Supplemental Tax Guide, and Publication 1779 (PDF), Employee Independent Contractor Brochure. For information on the tax responsibilities of self-employed persons, refer to Chapter 2 of Publication 505, Tax Withholding and Estimated Tax.
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