Self-Employment Tax and S-Corp Election

How self-employment tax works

On a sole proprietor's net Schedule C income, self-employment tax is 15.3% (12.4% Social Security on the first \$168,600 + 2.9% Medicare on all earnings). This is on top of regular income tax. A sole prop earning \$150K of net income pays roughly \$22,950 in SE tax alone.

An S-corp election (Form 2553) treats the owner as both an employee (paid a 'reasonable salary') and a shareholder (receiving the rest as a distribution). Only the salary portion is subject to FICA. The distribution portion escapes the 15.3% tax.

When the math works

Threshold for net savings is roughly \$50-75K of net income — below that, the cost of payroll setup, separate tax filings (Form 1120-S), and reasonable-compensation studies eats the savings. Above that, savings can be \$5-15K/year and grow with income.

'Reasonable compensation' is the IRS's tripwire. Pay yourself too low a salary and the IRS may reclassify distributions as wages. RCReports, BizComps, and BLS occupational data are commonly used to defend the salary level. A typical service-business owner earning \$200K total might split \$80-100K salary and \$100-120K distribution.

When the S-corp election makes sense

The S-corp election only saves money once self-employment tax savings exceed the additional cost of running the corporation: separate payroll, separate tax return, additional accounting fees, possibly state franchise taxes. The break-even point is usually around $50-80k of net self-employment earnings; below that, an LLC taxed as a sole proprietor is simpler and cheaper.

The IRS requires 'reasonable compensation' for the owner-operator's labor. Setting the salary at zero or trivially low while distributing all profits is an audit flag. Reasonable compensation is fact-specific — what you'd have to pay an unrelated person to do your job in your industry and geography — and is the topic the IRS is most likely to challenge in an S-corp audit.

Once the salary is set and run through W-2 payroll (with all the FICA, withholding, and unemployment that entails), the remaining profits flow through to the owner as K-1 distributions, which are not subject to self-employment tax. On $200k of profit with a $80k reasonable salary, the savings are roughly 15.3% of $120k = ~$18k per year, less the additional administrative cost. Below that threshold, the S-corp election usually doesn't pay for itself.

If you elect S-corp status mid-year, the salary calculation gets complicated. Most CPAs recommend timing the election for January 1 of a year when you've already established a stable income pattern, so the salary determination has a clear factual basis. Mid-year elections are possible but introduce documentation complexity that's rarely worth the partial-year savings.