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Generally, you are self-employed if any of the following apply to you.
You carry on a trade or business as a sole proprietor or an independent contractor.
You are a member of a partnership that carries on a trade or business.
You are otherwise in business for yourself (including a part-time business)
What are My Self-Employed Tax Obligations?
As a self-employed individual, generally you are required to file an annual return and pay estimated tax quarterly.
Self-employed individuals generally must pay self-employment tax (SE tax) as well as income tax. SE tax is a Social Security and Medicare tax primarily for individuals who work for themselves. It is similar to the Social Security and Medicare taxes withheld from the pay of most wage earners.
In general, anytime the wording "self-employment tax" is used, it only refers to Social Security and Medicare taxes and not any other tax (like income tax).