Brand-new business owners are sometimes surprised to find out that in addition to their federal income taxes, they must also pay a significant percentage of their income to the government in the form of SECA taxes.
The Self-Employment Contributions Act (SECA) tax is basically the business owner's version of the FICA tax that employees pay. Like FICA, it is made up of your "contributions" to both the Social Security and Medicare programs. However, the basic tax rate for the self-employed under SECA is 15.30 percent (twice the 7.65 percent rate that employees must pay on their paychecks as FICA tax) to reflect the fact that employees pay one-half the FICA tax and employers pay the other half.
What income counts? For starters, you don't have to worry about paying the SECA tax at all if your total business income, from all Schedule Cs combined and from any partnership or S corporation income that is treated as self-employment income, is less than $400. But if your total income is $400 or more, you must file a Schedule SE and pay SECA tax on your entire net business income, including the first $400.
If you are filing jointly and your spouse also files one or more Schedule Cs, each spouse must count his or her own income separately.
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Since it's the net income from your business that is the basis of SECA tax, certain types of income are not included: interest and dividends, sales of business property or other assets, and rental income from real estate or personal property. There's an exception to this rule if generating that income is your core business; for instance, if you are a real estate developer in the business of renting or selling property, you operate a bank, or you are in the rent-to-own business. Do not count any income from your hobbies.
Some special rules apply to the following:
Once you know what types of income to count, you can:
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