An S corporation is a regular corporation or LLC that has elected a special tax status with the IRS, allowing business profits to pass through to the owners’ personal tax returns instead of being taxed at the corporate level. This avoids the “double taxation” that standard corporations face, where the business pays corporate income tax and then shareholders pay personal income tax again on dividends. Beyond that pass-through structure, S corps offer a specific advantage that draws most small business owners to the election: the ability to reduce self-employment taxes by splitting income between a salary and distributions.
How S Corp Taxation Works
A standard corporation (called a C corporation) pays federal income tax on its profits. When those profits are distributed to shareholders as dividends, the shareholders pay tax on them again. An S corporation skips that first layer. The business itself pays no federal income tax. Instead, profits and losses flow through to each shareholder’s personal tax return, proportional to their ownership stake, and are taxed once at individual rates.
The S corporation files an informational return (Form 1120-S) each year, and each shareholder receives a Schedule K-1 showing their share of the company’s income, deductions, and credits. You report those figures on your personal return. This is similar to how partnerships and sole proprietorships are taxed, but with a key distinction that makes S corps attractive for many business owners.
The Self-Employment Tax Advantage
If you run a business as a sole proprietor or a single-member LLC, all of your net business income is subject to self-employment tax, which covers Social Security and Medicare and runs about 15.3% on the first chunk of earnings. With an S corporation, you can split your business income into two buckets: a W-2 salary you pay yourself, and shareholder distributions for the remaining profit. Only the salary portion is subject to payroll taxes. The distributions are not.
Here’s a simplified example. Say your business earns $150,000 in profit. As a sole proprietor, you’d owe self-employment tax on the full amount. As an S corp, you might pay yourself a salary of $80,000 and take the remaining $70,000 as a distribution. You’d owe payroll taxes on the $80,000 but not on the $70,000, potentially saving you thousands of dollars a year.
The IRS is well aware of this incentive and requires that S corp owner-employees pay themselves a “reasonable salary” before taking distributions. Courts have consistently held that shareholders who provide more than minor services to their corporation must receive compensation that reflects the value of those services. You can’t pay yourself $20,000 for a role that would command $90,000 on the open market and take the rest as distributions. The IRS looks at factors like what comparable businesses pay for similar work, your experience and training, and the time you devote to the business. If the IRS determines your salary is unreasonably low, it can reclassify distributions as wages and assess back payroll taxes plus penalties.
The Qualified Business Income Deduction
S corp owners may also benefit from the Section 199A deduction, which allows eligible pass-through business owners to deduct up to 20% of their qualified business income from their taxable income. If your S corp generates $100,000 in qualified business income, this deduction could reduce your taxable income by up to $20,000.
The deduction has income limits and restrictions. Certain service-based businesses like law firms, medical practices, and consulting firms see the deduction phase out at higher income levels. The phase-out ranges vary by filing status, with wider windows for joint filers. Below those thresholds, the deduction is generally available in full regardless of business type.
Who Can Elect S Corp Status
Not every business qualifies. The IRS imposes specific requirements:
- Shareholder limit: No more than 100 shareholders. Family members can elect to be treated as a single shareholder, so this limit is rarely a problem for small businesses.
- Shareholder type: Only individuals, certain trusts, and estates can be shareholders. Partnerships, corporations, and non-resident aliens cannot hold shares in an S corporation.
- One class of stock: The company can issue only one class of stock, meaning all shares must carry identical rights to distributions and liquidation proceeds. You can have voting and non-voting shares, but the economic rights must be the same.
- Domestic business: The corporation must be organized in the United States.
These rules mean S corps work well for small, domestically owned businesses but are a poor fit for companies seeking venture capital investment (since VC funds are typically partnerships) or those planning to bring on foreign investors.
How to Elect S Corp Status
An S corporation is not a type of business you form at the state level. You first form a corporation or LLC through your state, then separately elect S corp tax treatment with the IRS by filing Form 2553 (Election by a Small Business Corporation). All shareholders must sign the form consenting to the election.
Timing matters. To have the election take effect for the current tax year, you generally need to file Form 2553 no later than two months and 15 days after the beginning of the tax year. For a calendar-year business, that means filing by March 15. If you miss the deadline, the election typically takes effect the following tax year, though the IRS does grant late-election relief in certain situations if you can show reasonable cause.
If you’re starting with an LLC, the process involves two layers of election. You first file Form 8832 to have the LLC treated as a corporation for tax purposes (or you can skip this step and file Form 2553 directly, which the IRS treats as an implicit request for both elections). Either way, the end result is a business that operates with the flexibility of an LLC at the state level while being taxed as an S corporation federally.
Ongoing Requirements and Costs
Running an S corp comes with administrative responsibilities that sole proprietorships and standard LLCs don’t have. You’ll need to run payroll for any owner-employees, which means withholding income taxes and paying the employer’s share of Social Security and Medicare taxes. Most S corp owners use a payroll service, which typically costs $30 to $100 or more per month depending on the number of employees.
You’ll also need to file the annual Form 1120-S, which is more complex than the Schedule C a sole proprietor files. The cost of having a tax professional prepare an S corp return is meaningfully higher than a simple sole proprietor return, often running several hundred to a few thousand dollars depending on the complexity of your business.
State requirements vary. Many states recognize the federal S election and tax S corps as pass-through entities, but some impose their own corporate-level taxes or franchise taxes on S corporations regardless of the federal election. Check your state’s treatment before electing.
When an S Corp Makes Sense
The S corp election is most beneficial when your business is generating enough profit above a reasonable salary that the payroll tax savings outweigh the added costs of running payroll and filing a more complex tax return. If your business nets $40,000 a year and a reasonable salary for your role would be $35,000, the tax savings on that $5,000 distribution won’t justify the extra administrative expense.
As a rough starting point, many tax professionals suggest the S corp election starts making financial sense when your business consistently profits $60,000 to $80,000 or more after expenses, though the exact threshold depends on your specific salary requirements and costs. The calculation is straightforward: estimate your payroll tax savings on the distribution amount, then subtract the added costs of payroll processing, the more complex tax return, and any state-level fees. If the savings are clearly positive, the election is worth considering.
S corps also work well for businesses that plan to stay relatively small, with a limited number of domestic, individual shareholders. If you anticipate raising capital from institutional investors or going public, the shareholder restrictions will eventually force a conversion to C corp status, making the S election a temporary arrangement at best.