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In computing your Self-Employment Contributions Act (SECA) tax, the Medicare portion of the tax is imposed on 2.9% of all your net business income, with no upper limit.
The Social Security portion of the tax is 12.4%, but it will only applies to the first $97,500 you earn in 2007 ($102,000 in 2008). This dollar amount increases every year to reflect increases in the average American wage.
For purpose of determining whether you meet the $97,500 ceiling, only your own earnings - and not those of your spouse - are counted.
If you have earnings from a regular job, or perhaps more than one job, your employer will automatically be withholding FICA tax on your wages. Your wages, salary, bonus, tips, etc. earned on the job will count toward the $97,500 amount, and at most your SECA tax will apply to the difference.
Overpayments of FICA tax. If you had more than one job during the year, and the total of all your income from those jobs added up to more than $97,500, you don't need to pay any SECA tax on your self-employment income. What's more, it's likely that too much Social Security tax has been withheld from your paychecks.
Take a look at the amount in Box 4 on all of your W-2 Forms. If you add them up and the sum is more than $6,045 in 2007 ($97,500 x 6.2 percent), you've paid too much tax. The overpayment (what you've paid, minus the maximum dollar amount) can be claimed as a subtraction from your tax bill on Line 67 of Form 1040. You cannot use Form 1040EZ or Form 1040A to claim this overpayment.
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