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Updated for 2011
You deduct part of the self-employment tax on Form 1040, line 27.
UPDATE: For 2011, the employee's share of social security tax was reduced 2%, to 4.2% (.042). As of this writing, this reduction was also extended for two months in 2012.
Figuring Your Self-employment Tax Deduction
Because of the 2% reduction in the social security tax for employees, a self-employed person must perform a special computation to figure the self-employment tax deduction, which is entered on the first page of Form 1040.
The deduction is entered on Form 1040, Line 27 (2011). It's deductible even if you don't itemize your deductions.
Since you don't have to itemize your deductions to deduct self-employment tax it is referred to as an above-the-line deduction.
In figuring your self-employment tax do not reduce net earnings by your deductible contributions to your own SEP or Keogh plan (Form 1040, Line 28) or your self-employed health insurance deduction (Form 1040, Line 29).
You'll notice on Schedule SE, line 4a, there is a decimal of .9235 listed. You multiply the net profit amount on Schedule C1 by this decimal to determine net earnings from self-employment.
Self-Employment Tax: Self-Employment Tax and Married Couples; Community Property States; Retirees and Self-Employment Tax
Copyright © 2008-2012 Larry Villano. All rights reserved.