Popsugar Living Taxes Tax Tips For Freelancers March 12, 2014 by Emily Co View On One Page Photo 3 of 6 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 3 How Do I Know How Much the Self-Employment Tax Is? Self-employment tax equals 15.3 percent on the first $113,700 of net income and then 2.9 percent on the net income that is in excess of $113,700. The Social Security tax component of the self-employment tax is 12.4 percent. Note: one half of your self-employment tax is deductible as an adjustment to income. If your profits are more than $200,000 ($250,000 on joint returns), you are subject to the 0.9 percent additional Medicare tax. Previous Next Start Slideshow Taxes