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2017 Schedule C Social Security Tax Calculator

Multiple Calculator release 2.0.7. Category: Finance. Check the displayed formula, units, assumptions, and limitations before use. Methodology · Report an error · Disclaimer
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Use this calculator to determine your 2017 Schedule C Social Security tax liability. The calculator follows IRS rules for self-employment income and Social Security taxes.

What is Schedule C?

Schedule C is an IRS form used to report self-employment income and expenses. It's part of Form 1040 and is required for any business owner who earned $400 or more from self-employment during the year.

For 2017, Schedule C reports income from sole proprietorships, partnerships, and S corporation shareholders. The form calculates net profit or loss by subtracting business expenses from gross income.

Note: Schedule C does not report income from corporations or trusts. Those entities use different forms like Form 1120 or Form 1065.

Social Security Tax Rates

Self-employed individuals pay Social Security taxes on net earnings from self-employment. The tax rate is 15.3% for 2017, with 12.4% going to Social Security and 2.9% going to Medicare.

The maximum taxable earnings for Social Security in 2017 were $128,400. Any earnings above this amount are subject to an additional 0.9% Medicare tax.

Social Security Tax = Net Earnings × 12.4% Medicare Tax = Net Earnings × 2.9% Additional Medicare Tax = (Net Earnings - $128,400) × 0.9%

How to Calculate 2017 Schedule C Social Security Tax

To calculate your 2017 Schedule C Social Security tax:

  1. Determine your net profit from Schedule C
  2. Calculate 12.4% for Social Security tax
  3. Calculate 2.9% for Medicare tax
  4. If net profit exceeds $128,400, calculate additional 0.9% Medicare tax on the excess
  5. Sum all taxes to get your total Social Security tax liability

The calculator automates these steps for you. Simply enter your net profit from Schedule C and it will compute all required taxes.

Example Calculation

Let's say your 2017 Schedule C net profit was $150,000. Here's how the calculation works:

Social Security Tax = $150,000 × 12.4% = $18,600 Medicare Tax = $150,000 × 2.9% = $4,350 Additional Medicare Tax = ($150,000 - $128,400) × 0.9% = $2,160 Total Social Security Tax = $18,600 + $4,350 + $2,160 = $25,110

This example shows how the additional Medicare tax applies to earnings above the $128,400 threshold.

Frequently Asked Questions

Do I need to pay Social Security tax on all Schedule C income?
Yes, self-employed individuals must pay Social Security tax on net earnings from self-employment, regardless of whether they also pay payroll taxes.
What if my Schedule C net profit is negative?
If you have a net loss on Schedule C, you generally don't owe Social Security tax. However, you may still owe Medicare tax if your net earnings exceed the threshold.
How do I report Schedule C Social Security tax?
You'll report the tax on Form 1040, Schedule SE (Form 1040-SSE), and Schedule C. The calculator helps determine the correct amounts to report.
Are there any deductions for Schedule C Social Security tax?
No, Social Security tax on Schedule C income isn't subject to any deductions or credits. The full amount is typically due when you file your tax return.
What if I have multiple Schedule C forms?
You'll need to calculate Social Security tax separately for each Schedule C form and report the total on your tax return.