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Who must pay self-employment tax and why? Well, if you’re self-employed, you will be responsible for self-employment tax. How do you determine your liability? For the purpose of determining self-employment tax, you are self-employed if you are a sole proprietor, an independent contractor, a member of a partnership, or are otherwise in business for yourself. If you are a self-employed individual, you will have a Schedule C to attach to your Form 1040, and self-employment tax is computed on Form 1040, Schedule SE. Individuals must pay self-employment tax is they have net earnings of $400 or more and there are several sources of net earnings that are used when figuring your self-employment tax liability.