Self-Employment Tax and the S Corporation: Why It Isn’t a Magic Bullet

Figures reflect rules in effect as of October 2026.

An S corporation can lower Social Security and Medicare tax, but only on profit above a reasonable salary for your work. Against that saving sit payroll costs, California’s $800 minimum tax, State Disability Insurance on your salary and, often, a smaller Section 199A deduction. At moderate profits, the election can cost more than it saves.

The pitch is familiar: form an S corporation, pay yourself part of the profit as salary, take the rest as distributions, and skip payroll tax on the distributions. The structure is legal and sometimes worth it. The saving is usually smaller than the pitch suggests, and the IRS watches the salary.

What does self-employment tax cover?

Self-employment tax is Social Security and Medicare on business profit. A sole proprietor pays 15.3% (12.4% Social Security and 2.9% Medicare) on 92.35% of net profit, and deducts half of what they pay.¹

For 2026, the Social Security part stops at $184,500 of combined wages and self-employment earnings. For 2027 that cap rises to $192,300.² Medicare has no cap, and an extra 0.9% applies above $200,000 of wages and self-employment income ($250,000 married filing jointly, $125,000 married filing separately).³

In an S corporation, your salary carries the same 15.3%, split between you and the company. Profit paid out beyond the salary carries neither. That gap is the whole saving.

What counts as a reasonable salary?

An S corporation must pay a shareholder who works in the business reasonable compensation before taking distributions, and the IRS can reclassify distributions as wages subject to employment taxes. Factors the IRS lists include:⁴

• training and experience;
• duties and responsibilities;
• time and effort devoted to the business;
• what comparable businesses pay for similar services;
• pay to employees who are not owners; and
• the company’s dividend history.

In David E. Watson, P.C. v. United States, a CPA paid himself $24,000 a year through his S corporation in 2002 and 2003 while taking distributions of $203,651 and $175,470. The court accepted the government expert’s $91,044 as reasonable pay, so another $67,044 a year was treated as wages subject to FICA tax. The Eighth Circuit affirmed in 2012.⁵

Is the saving real? Two hypothetical owners

Here are two hypothetical owners in 2026. Each is single, has no other income, takes the $16,100 standard deduction and is well below the 199A threshold.⁶ Each compares staying a sole proprietor with electing S corporation status and paying the salary shown, in a year after the company’s first.

The tables count Social Security and Medicare tax, federal income tax, California’s S corporation tax and State Disability Insurance. They leave out California personal income tax, which here is roughly $130 to $300 higher with the S corporation, employer unemployment taxes on the first $7,000 of salary, and the cost of payroll service and a second tax return.

In the first, the S corporation saves $2,834 of payroll tax but adds $4,965 of federal income tax. The salary is not qualified business income, so the 199A deduction shrinks.⁷ On the taxes in the table, the S corporation ends about $4,490 behind. In the second, the payroll saving is $6,308 and the S corporation still ends about $1,796 behind.

The result turns on the salary. In the first hypothetical, a salary below about $97,000 would put the S corporation ahead on these taxes; at $80,000 it would be about $3,350 ahead. What salary is reasonable depends on your work, not on the tax result.

A common shortcut multiplies 15.3% by all the profit above the salary. That overstates the saving: it skips the 92.35% factor and the deduction for half of self-employment tax, and it leaves out the 199A deduction.

The balance can tip the other way as profit rises well above a reasonable salary, because the payroll saving grows with the gap. It also changes above the 199A thresholds, where the deduction phases out for specified service businesses and the wages an S corporation pays can raise it for others. My guide to the Section 199A deduction covers those limits.

What does California add?

• The 1.5% tax. California taxes an S corporation’s income at 1.5%, with an $800 minimum due in the first quarter each year, even in a loss year. The minimum is waived for a new S corporation’s first year.⁸
• State Disability Insurance. Your salary carries SDI at 1.3% for 2026, with no wage cap.⁹ It buys Disability Insurance and Paid Family Leave coverage. Corporate officers count as employees for SDI. A sole proprietor pays it only by electing coverage.¹⁰
• Employer unemployment taxes. 3.4% for a new employer, plus a 0.1% training tax, on the first $7,000 of wages.⁹
• Personal income tax. Salary and S corporation profit are taxed on your California return at the same rates as other income, up to 13.3% including the 1% tax on taxable income over $1 million.¹¹˒¹²

Does the PTET election still help?

California’s pass-through entity elective tax, or PTET, lets an S corporation pay 9.3% of its qualified net income at the entity level. Shareholders who consent receive a matching California credit. The election is made each year on a timely filed original return and is available through tax year 2030.¹³ The IRS allows the payment as a deduction for the business, outside the cap on individual state and local tax deductions.¹⁴

For 2026 and later, the first payment, the greater of $1,000 or 50% of the prior year’s elective tax, is still due June 15, and the balance is due by the return’s original due date. Missing or underpaying the June payment no longer voids the election, but it reduces the credit by 12.5% of the shortfall.¹³

PTET mattered most when the federal deduction for state and local taxes was capped at $10,000. For 2026 the cap is $40,400, reduced by 30% of modified AGI over $505,000 but never below $10,000, and it returns to $10,000 in 2030.¹⁵ With the higher cap, many owners who itemize can deduct their state tax without PTET. It also helps owners who take the standard deduction, since the entity deducts the tax either way,¹⁴ and for the top bracket it sidesteps the 35% limit on the value of itemized deductions.¹⁵ It now matters most to owners whose income phases the cap down toward $10,000, or whose state and local taxes far exceed $40,400.

What else should an owner weigh?

• Retirement plans. Only your W-2 salary counts toward solo 401(k) contributions; distributions are not earned income for plan purposes.¹⁶ A lower salary means a lower limit. My post on choosing a solo 401(k) or SEP IRA covers the plan choice.
• Net investment income tax. Neither self-employment income nor operating income from a business you are active in is subject to the 3.8% tax, so it does not separate the two structures.¹⁷
• Records. Document how you set the salary each year, keep a separate bank account, and track your stock basis, which limits the losses you can deduct and the distributions you can take tax-free.¹⁸

This list is a starting point, not a substitute for a reasonable-compensation analysis and a projection from your CPA. I build the decision into the tax-aware planning I do for clients, alongside timing moves in the year-end tax review.

The Bottom Line

An S corporation saves payroll tax only on profit above a reasonable salary, and the IRS decides what is reasonable by looking at your work. Against that saving sit the 199A deduction it can shrink, California’s $800 minimum tax and SDI, and the cost of payroll. PTET helps fewer owners now that the state and local tax cap is higher. Run the whole comparison before electing, not just the payroll line.

If you are weighing an S corporation election and want to see the full comparison for your own numbers, book a complimentary 15-minute call.