The main benefits of an S corporation are pass-through taxation that avoids the double tax hit of a C corporation, payroll tax savings on profits distributed above a reasonable salary, potential eligibility for the 20 percent qualified business income deduction, personal liability protection through a formal corporate structure, and straightforward transfer of ownership through stock. For an active owner of a profitable small business, those first two benefits usually drive the decision.
Profits Taxed Once, Not Twice
A C corporation pays federal income tax on its profits, and shareholders pay tax again when those profits come out as dividends. An S corporation skips that second layer. The business itself generally owes no federal income tax; its net income, losses, deductions, and credits flow through to shareholders in proportion to their ownership.1Internal Revenue Service. S Corporations Each shareholder reports their share on their personal return and pays at their individual rate.
The mechanics are simple. The corporation files Form 1120-S and issues each owner a Schedule K-1 showing their allocation. That figure lands on Schedule E of the shareholder’s Form 1040. Profits are taxed in the year the corporation earns them, whether or not the money is actually distributed.
Losses flow through the same way. A shareholder can use S corporation losses to offset other income on their personal return, but only up to their basis in the company. Any loss beyond basis carries forward until further investment absorbs it.
Payroll Tax Savings on Distributions
This is where the S corporation earns its reputation. Owner-employees have to take a reasonable salary for the work they do, and that salary is subject to FICA: 6.2 percent Social Security and 1.45 percent Medicare on each side, for a combined 15.3 percent on wages up to the Social Security wage base of $184,500 in 2026.2Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates An additional 0.9 percent Medicare surtax applies to employee wages above $200,000, with no matching employer share.3Internal Revenue Service. General Instructions for Forms W-2 and W-3
Any remaining profit that comes to you as a shareholder distribution, on top of that reasonable salary, is not subject to payroll taxes. Run the same business as a sole proprietorship or general partnership and every dollar of net profit gets hit with self-employment tax at effectively the same 15.3 percent rate. That gap is the core dollar advantage.
What “Reasonable Salary” Actually Means
There’s no formula. The IRS expects your salary to match what someone with your qualifications, experience, and responsibilities would earn doing similar work elsewhere. Courts have weighed the time and effort you put into the business, comparable pay at similar companies, the corporation’s dividend history, and how bonuses are timed.4Internal Revenue Service. Wage Compensation for S Corporation Officers Regional salary surveys are the standard way to document a defensible number.
Set the salary too low relative to your distributions and the IRS can recharacterize those distributions as wages, then assess the back payroll taxes, interest, and penalties. Courts have upheld that treatment; in one well-known case, an accountant who took all his compensation as dividends saw the Tax Court rule the payments were wages subject to employment taxes.5Internal Revenue Service. S Corporation Employees, Shareholders and Corporate Officers
On top of the reclassified tax, the accuracy-related penalty is 20 percent of the underpayment.6Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments If the IRS finds actual fraud rather than a miscalculation, the fraud penalty is 75 percent of the underpayment attributable to fraud.7Office of the Law Revision Counsel. 26 USC 6663 – Imposition of Fraud Penalty Interest runs from the original filing deadline. Keep the market data you used to set your salary.
The 20 Percent QBI Deduction
S corporation shareholders may also claim the qualified business income deduction, which lets eligible owners deduct up to 20 percent of their share of the business’s qualified income on their personal return. The deduction was originally scheduled to sunset after 2025 but was made permanent by legislation enacted in 2025.8Internal Revenue Service. Qualified Business Income Deduction
Below roughly $203,000 in taxable income for single filers or $406,000 for joint filers in 2026, the deduction is straightforward. Above those thresholds it phases out for specified service businesses like law, accounting, health care, and consulting, and it becomes limited by the W-2 wages the S corporation pays and the value of its depreciable property. Higher payroll can actually increase the QBI deduction, which is one reason the salary decision matters beyond payroll tax math.
Liability Protection for Owners
An S corporation is a full corporate entity under state law. That creates the corporate veil: the business can sign contracts, own property, and owe debts as its own legal person. If the company is sued or defaults on a loan, creditors generally can’t reach your personal bank accounts, home, or other assets.
The protection isn’t automatic. Courts can pierce the veil when owners blur the line between themselves and the corporation. The usual triggers are mixing personal and business funds, leaving the business undercapitalized for its obligations, or skipping corporate formalities like annual shareholder meetings and minutes. Keep a dedicated business bank account, keep personal expenses out of it, hold and document annual meetings, and treat the corporation as genuinely separate.
Easier Ownership Transfers
Ownership in an S corporation is divided into shares of stock, so transferring a stake is simpler than in a partnership, which typically requires rewriting the partnership agreement. A shareholder can sell or gift stock through a stock purchase agreement, and new investors can buy in without restructuring the entity. The corporation’s legal life isn’t tied to any one owner, so death, retirement, or a sale doesn’t interrupt operations. That makes succession planning and eventual sale considerably easier.
One catch: every shareholder must remain an eligible owner under federal tax law. Transfer stock to a nonresident alien, another corporation, or a partnership and the S election terminates on the date of the transfer.9Office of the Law Revision Counsel. 26 USC 1362 – Election, Revocation, Termination The company then reverts to C corporation taxation and the double-tax exposure that comes with it. Verify eligibility before any transfer closes.
Who Qualifies
Not every business can elect S status, and the requirements have to be met continuously, not just at election. The corporation must be domestic. Shareholders are limited to U.S. citizens, resident aliens, certain trusts, and estates; partnerships, other corporations, and nonresident aliens can’t hold the stock.1Internal Revenue Service. S Corporations There can be no more than 100 shareholders, though family members sharing a common ancestor, along with their lineal descendants and spouses, count as one. The corporation can issue only one class of stock, meaning identical rights to distributions and liquidation proceeds; different voting rights are fine as long as the economic rights match.10Office of the Law Revision Counsel. 26 USC 1361 – S Corporation Defined
S corporation is a tax designation, not a separate entity type. You first form a corporation, or in some cases an LLC, under state law, then elect S status by filing Form 2553 with the IRS.11U.S. Small Business Administration. Choose a Business Structure For the election to apply to the current tax year, file Form 2553 within two months and 15 days after the tax year starts — March 15 for a calendar-year business.12Internal Revenue Service. Instructions for Form 2553 Every shareholder at the time of filing must sign.
What Can Erode the Benefits
A few situations can undo the advantages. State tax treatment isn’t uniform: most states honor the federal election and tax the business as a pass-through, but some impose an entity-level income or franchise tax on S corporations, and a few require a separate state election. Confirm with your state’s tax agency before assuming pass-through treatment applies everywhere you do business.
If your S corporation was previously a C corporation and still holds undistributed C corporation earnings, watch passive investment income like rents, royalties, interest, and dividends. When passive income exceeds 25 percent of gross receipts, the S corporation owes a special tax on the excess.13eCFR. 26 CFR 1.1375-1 – Tax on Excess Passive Investment Income Cross that threshold three years in a row and the S election terminates.9Office of the Law Revision Counsel. 26 USC 1362 – Election, Revocation, Termination Distributing old C corporation earnings soon after conversion avoids the problem.
Finally, the corporate formalities that support liability protection aren’t optional. Hold annual shareholder meetings, keep minutes, separate corporate and personal finances, and file the annual reports and franchise fees your state requires. Skip them and you risk losing the veil that made the structure worth choosing.