What Is an S Corp vs LLC and What Are the Pros and Cons?

‍An LLC (limited liability company) is a legal business entity formed under state law, while an S Corp (S corporation) is a federal tax classification elected through the IRS that changes how business income is taxed. Both structures provide limited liability protection and pass-through taxation, but they differ in self-employment tax treatment, management flexibility, ownership restrictions, and ongoing compliance requirements. The most common path for small business owners is to form an LLC under state law and then elect S Corp tax treatment with the IRS once profits justify the additional payroll and compliance costs. The IRS received 6,080,370 Form 1120-S returns in fiscal year 2024, up 3.4% from the prior year, according to the IRS Data Book, which reflects how widely the S Corp election is used by growing businesses.

The sections below cover what an LLC is and how it is taxed, what an S Corp is and how it is taxed, the pros and cons of each structure, a side-by-side comparison, who pays more in taxes, at what income level the S Corp election becomes worth it, what reasonable salary means and why it matters, when and how to switch from an LLC to an S Corp, how the S Corp election affects the qualified business income (QBI) deduction, and whether an LLC can elect S Corp status while remaining an LLC under state law.

Key Takeaways

• An LLC is a legal entity. An S Corp is a tax election. They are not the same thing, and an LLC can elect to be taxed as an S Corp while remaining an LLC under state law.
• Both structures provide limited liability protection and pass-through taxation, avoiding the double taxation that C corporations face at the 21% corporate rate.
• The primary tax advantage of the S Corp election is the ability to split income between a reasonable salary (subject to payroll taxes) and distributions (not subject to self-employment tax at 15.3%).
• An LLC without an S Corp election pays self-employment tax on 100% of net business earnings, which costs 15.3% on the first $176,100 (2025 Social Security wage base) plus 2.9% Medicare on earnings above that amount.
• The S Corp election generally becomes worthwhile when annual net profit consistently exceeds $60,000 to $80,000 and the payroll tax savings exceed the additional compliance costs of $3,000 to $5,000 per year.
• S Corps are limited to 100 shareholders, one class of stock, and U.S. citizen or resident alien shareholders only, per IRC Section 1361(b)(1).
• The OBBBA, signed July 4, 2025, made the QBI deduction permanent. Reasonable compensation paid to an S Corp owner reduces the QBI base, which means the salary-versus-distribution split affects both self-employment tax and the QBI deduction simultaneously.
• To elect S Corp status, file IRS Form 2553 by March 15 of the tax year (for calendar-year filers). Late election relief is available under Rev. Proc. 2013-30.

What Is an LLC and How Is It Taxed?

An LLC is a legal business entity formed by filing articles of organization with a state's business filing office, and it is taxed by default as a sole proprietorship (single member) or a partnership (multiple members) unless the owner elects a different tax classification. The LLC is the most popular business entity form in the United States. Pass-through firms, which include LLCs, sole proprietorships, partnerships, and S corporations, accounted for 96% of the 38 million business tax returns filed for the 2019 tax year, according to IRS data reported by the Congressional Research Service.

A single-member LLC reports all business income and expenses on Schedule C of the owner's Form 1040. The net profit flows directly to the owner's personal return and is subject to both income tax and self-employment tax. Self-employment tax applies at 15.3% on net earnings: 12.4% for Social Security (on the first $176,100 for 2025) and 2.9% for Medicare on all earnings. An additional 0.9% Medicare surtax applies to earnings above $200,000 for single filers and $250,000 for joint filers, per IRC Section 3101(b)(2).

A multi-member LLC is taxed as a partnership by default, filing Form 1065 and issuing Schedule K-1 to each member. Each member's share of net income is subject to self-employment tax on the member's individual return, just as with a single-member LLC. The LLC structure itself provides no relief from self-employment tax, which is the primary tax reason business owners consider the S Corp election as profits grow. We walk through this tax comparison during business formation engagements with new business owners, because the entity and tax election decisions interact with self-employment tax, QBI, and state-level filing obligations simultaneously.

What Is an S Corporation and How Is It Taxed?

An S Corporation is not a separate type of business entity but rather a federal tax classification under Subchapter S of the Internal Revenue Code that allows a qualifying corporation or LLC to pass income through to its owners while splitting that income between salary and distributions for payroll tax purposes. S corporations became the most common corporate entity type in 1997, according to the IRS Statistics of Income Division, and the IRS received over 6 million S corporation returns in fiscal year 2024.

To elect S Corp status, a business files IRS Form 2553, Election by a Small Business Corporation, signed by all shareholders. The election must be filed by the 15th day of the 3rd month of the tax year, which is March 15 for calendar-year filers. Late election relief is available under Revenue Procedure 2013-30 for businesses that missed the deadline but intended to elect S Corp status from the beginning of the year.

The S Corp files its own tax return on Form 1120-S and issues Schedule K-1 to each shareholder, reporting their share of income, deductions, and credits. The critical tax difference from an LLC is how the owner's income is categorized. An S Corp owner who actively works in the business must pay themselves a reasonable salary through W-2 payroll, subject to Social Security, Medicare, and income tax withholding. Income distributed above the reasonable salary is classified as a distribution and is not subject to self-employment tax. That split between salary and distributions is the mechanism that produces the S Corp's tax planning advantage over a standard LLC.

What Are the Pros and Cons of an LLC?

The pros of an LLC are management flexibility, simpler compliance, flexible profit allocation, no ownership restrictions, and pass-through taxation without Subchapter S limitations. The cons of an LLC are full self-employment tax exposure on net earnings, limited appeal to outside investors, and state-specific fees that can be significant in certain jurisdictions.

The advantages of an LLC include:

• Management flexibility. LLCs can be managed by the members (member-managed) or by appointed managers (manager-managed). No board of directors, no officer positions, and no formal meeting requirements are imposed by LLC statutes.
• Fewer compliance formalities. LLCs are not required to hold annual shareholder meetings, maintain corporate minutes, or follow the procedural requirements that corporation laws impose on S Corps and C Corps.
• Flexible profit allocation. LLC members can allocate profits and losses disproportionately to ownership percentages through the operating agreement. S Corps must allocate strictly by share ownership.
• No ownership restrictions. LLCs have no limit on the number of members, no restrictions on the types of members (foreign nationals, other entities, trusts all qualify), and no single-class-of-ownership requirement.
• Simpler tax filing for single-member LLCs. A single-member LLC reports income on Schedule C of the owner's Form 1040, avoiding the need for a separate entity-level tax return.

The disadvantages of an LLC include:

• Full self-employment tax on net earnings. An LLC owner pays 15.3% self-employment tax on 100% of net business profit. On $150,000 of net earnings, self-employment tax alone is approximately $21,194, according to the IRS self-employment tax calculation under Schedule SE.
• Limited investor appeal. Venture capital firms and institutional investors generally prefer to invest in corporations rather than LLCs because corporate stock is easier to issue, transfer, and structure for liquidation preferences.
• State-specific fees. Some states impose significant fees on LLCs. California charges an $800 minimum annual franchise tax plus an additional fee based on gross receipts for LLCs earning over $250,000. These fees apply regardless of profitability.

What Are the Pros and Cons of an S Corp?

The pros of an S Corp are self-employment tax savings on distributions, credibility with lenders and investors, perpetual existence, and easier conversion to a C Corp. The cons of an S Corp are the reasonable salary requirement, strict eligibility rules, higher compliance costs, and restrictions on ownership and stock classes.

The advantages of an S Corp include:

• Self-employment tax savings. S Corp owners pay payroll taxes only on their reasonable salary, not on distributions. An owner earning $150,000 who pays a $70,000 salary and takes $80,000 in distributions saves approximately $12,240 in self-employment tax compared to an LLC owner paying SE tax on the full $150,000.
• Credibility with lenders. Some banks and lenders view the corporate structure more favorably than an LLC when evaluating loan applications, because the formal governance requirements signal operational discipline.
• Perpetual existence. A corporation continues to exist regardless of changes in ownership. The death or departure of a shareholder does not dissolve the entity.
• Easier conversion to C Corp. Converting an S Corp to a C Corp requires only the revocation of the S election with the IRS. No state-level entity conversion is needed because the corporation is already a corporation under state law.

The disadvantages of an S Corp include:

• Reasonable salary requirement. The IRS requires S Corp owner-employees to pay themselves a reasonable salary for services performed. Setting salary too low triggers IRS reclassification of distributions as wages, plus penalties and back payroll taxes. Setting salary too high wastes the self-employment tax savings the S Corp election was designed to produce.
• 100-shareholder limit. S Corps cannot have more than 100 shareholders, per IRC Section 1361(b)(1)(A). Family members can elect to be treated as a single shareholder, but the cap still limits fundraising flexibility.
• One class of stock. S Corps can issue only one class of stock, which means no preferred stock, no liquidation preferences, and no different economic rights among shareholders. Differences in voting rights are permitted.
• Higher compliance costs. S Corps must run payroll (including quarterly Form 941 filings), file a separate entity-level tax return (Form 1120-S), and maintain corporate formalities. The additional annual cost for a small business typically runs $3,000 to $5,000 for payroll processing, financial statements, and the entity return.
• Shareholder restrictions. Only U.S. citizens, resident aliens, certain trusts, and certain tax-exempt organizations can be S Corp shareholders. Partnerships, corporations, and nonresident aliens cannot hold S Corp stock.

What Is the Difference Between an S Corp and an LLC?

The difference between an S Corp and an LLC is that an LLC is a legal entity type formed under state law, while an S Corp is a federal tax election made with the IRS under Subchapter S of the Internal Revenue Code. An LLC and an S Corp are not mutually exclusive. An LLC can elect to be taxed as an S Corp by filing Form 2553, which means the business remains an LLC under state law but is taxed as an S Corp for federal purposes. The table below compares the two structures across the attributes that matter most to business owners.

FeatureLLC (Default Tax Treatment)S Corporation (or LLC with S Corp Election)What it isA legal business entity formed under state lawA federal tax classification under IRC Subchapter SFormationFile articles of organization with stateFile articles of incorporation (or form LLC) + file Form 2553 with IRSLiability protectionYes, members' personal assets protectedYes, shareholders' personal assets protectedPass-through taxationYes (Schedule C or Form 1065)Yes (Form 1120-S, K-1 to shareholders)Self-employment taxPaid on 100% of net earnings (15.3%)Paid only on reasonable salary; distributions exemptOwnership limitsNo limit on number or type of membersMaximum 100 shareholders; U.S. citizens/residents onlyStock classesFlexible membership interests via operating agreementOne class of stock only (voting differences permitted)Profit allocationFlexible; can differ from ownership percentagesStrictly proportional to share ownershipManagement structureMember-managed or manager-managed; no formal requirementsBoard of directors, officers, annual meetings requiredPayroll requirementNo payroll required for ownerOwner-employees must receive W-2 salary through payrollTax return filedSchedule C (single member) or Form 1065 (multi-member)Form 1120-SAnnual compliance costLower (state fee + operating agreement)Higher ($3,000-$5,000/year for payroll, return, bookkeeping)QBI deduction eligibleYes, on full net profitYes, but only on income above reasonable salary

Who Pays More Taxes, LLC or S Corp?

An LLC owner generally pays more in total payroll and self-employment taxes than an S Corp owner at the same income level, because the LLC owner pays self-employment tax on 100% of net earnings while the S Corp owner pays payroll tax only on reasonable salary. The income tax portion is identical for both structures because both are pass-through entities. The difference is entirely in the self-employment tax calculation.

A concrete example illustrates the gap. Assume a single business owner earning $150,000 in net business profit. Under an LLC (default taxation), self-employment tax on $150,000 is approximately $21,194 (calculated as 92.35% of net earnings multiplied by 15.3%, per IRS Schedule SE instructions). Under an S Corp election with a $70,000 reasonable salary, payroll taxes on the salary are approximately $10,710 (employer and employee shares of FICA combined). The $80,000 in distributions is not subject to self-employment tax. The S Corp owner saves approximately $10,484 in payroll taxes compared to the LLC owner, before accounting for the additional compliance costs of maintaining the S Corp election.

The savings grow as net profit increases, because every dollar above reasonable salary that is classified as a distribution avoids the 15.3% self-employment tax rate. At $250,000 in net profit with a $90,000 salary, the annual savings approach $20,000. At $100,000 in net profit with a $60,000 salary, the savings are smaller and must be weighed against the $3,000 to $5,000 annual cost of payroll, the separate tax return, and the additional business consulting required to maintain compliance. The math is straightforward, but the reasonable salary must be defensible.

At What Income Is S Corp Worth It?

The S Corp election is generally worth it when annual net business profit consistently exceeds $60,000 to $80,000 and the self-employment tax savings exceed the additional compliance costs of maintaining the election. Below that range, the savings are too small to justify the payroll setup, quarterly filings, separate entity tax return, and bookkeeping overhead. Above that range, the savings compound and the election pays for itself many times over.

The break-even calculation is specific to each business. A sole proprietor earning $70,000 in net profit pays approximately $9,891 in self-employment tax. An S Corp owner with the same $70,000 profit who sets a $45,000 reasonable salary pays approximately $6,885 in payroll taxes, saving roughly $3,006. That $3,006 saving sits right at the lower boundary of annual S Corp compliance costs, which means the election barely breaks even. At $100,000 in net profit, the savings jump to approximately $5,000 to $7,000, well above the compliance cost threshold.

Income consistency matters as much as the dollar level. A business that earns $120,000 one year and $30,000 the next receives the S Corp benefit only in the high year, while paying the compliance costs every year. Startup advisory clients in their first two years of operation often face this variability, which is why we recommend waiting until the business demonstrates consistent profitability before making the election.

What Is Reasonable Salary for an S Corp Owner?

Reasonable salary for an S Corp owner is the amount that would be paid to an unrelated employee performing the same services in a comparable position, in the same industry, in the same geographic area. The IRS does not publish a specific dollar figure or percentage. Instead, the agency evaluates several factors: the owner's duties and responsibilities, the time and effort committed, comparable compensation for similar services, the company's revenue and profitability, and distributions relative to salary.

Setting reasonable salary too low is the most common IRS audit trigger for S corporations. The IRS has successfully reclassified distributions as wages in multiple court cases, including Watson v. Commissioner (2012) and Radtke v. United States (1990). Reclassification results in back payroll taxes, interest, and penalties on the reclassified amount. Setting reasonable salary too high eliminates the self-employment tax savings that motivated the S Corp election in the first place and also reduces the QBI deduction base.

A defensible salary determination starts with third-party compensation data from sources like the Bureau of Labor Statistics Occupational Employment and Wage Statistics, industry salary surveys, and comparable job postings in the local market. We prepare formal reasonable compensation analyses for S Corp clients as part of our tax planning process, because the salary decision is the single variable that determines the total tax outcome of the S Corp election each year.

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