Sole Proprietor vs LLC vs S Corporation Tax Comparison 2026: Self-Employment Tax, Reasonable Salary, and QBI

For a single owner running a profitable business, the three common federal tax paths are sole proprietorship, single-member LLC taxed as a sole proprietorship, and an entity with an S corporation election. The single-member LLC defaults to disregarded-entity treatment, so for federal income tax purposes a default LLC and a sole proprietorship look identical: income and expenses flow to Schedule C of Form 1040. The S corporation election, made on Form 2553, changes the federal tax treatment by separating the business profits into a wage component, which is subject to payroll taxes, and a distribution component, which is not subject to self-employment tax.

This page compares the three paths from a tax perspective only. Liability protection, governance, banking, contracting, and capital-raising considerations are also important when picking an entity, but they are legal and operational issues, not tax issues. The same business, with the same revenue and expenses, can produce materially different combined federal tax bills depending on the entity structure and on whether reasonable compensation is documented and paid for an S corporation owner. The differences are large enough that the choice deserves a careful comparison rather than a default to whatever a search-engine result suggested.

The summary upfront: a sole proprietorship is simple and cheap to run; a single-member LLC adds liability protection without changing federal tax outcomes; an S corporation election can produce self-employment tax savings on profit above the reasonable salary, but it adds payroll, separate returns, fringe benefit complexity, and reasonable compensation defense risk. The answer depends on profit level, owner involvement, state taxes, and the cost of compliance.

Self-employment tax is the combined Social Security and Medicare tax on self-employment income, governed by IRC Sections 1401 through 1403 and computed on Schedule SE. The combined rate is 15.3 percent on net self-employment earnings up to the Social Security wage base, plus 2.9 percent above the wage base, plus an additional 0.9 percent Additional Medicare Tax above the higher-income thresholds. A sole proprietor with $150,000 of Schedule C net profit pays self-employment tax on essentially all of that profit, with a small offset under Schedule SE for the deductible portion of self-employment tax.

An owner of a single-member LLC taxed as a disregarded entity has the same outcome as a sole proprietor. The federal tax effect of forming the LLC, by itself, is zero. The state effect depends on the state, with several states imposing franchise taxes, gross receipts taxes, or annual fees on LLCs even when there is no federal income tax change.

An S corporation owner who is also an employee of the corporation receives a W-2 wage. The corporation pays the employer share of Social Security and Medicare tax on that wage. The remaining profit, after the wage and other expenses, can be distributed to the owner as a non-wage distribution that is not subject to self-employment tax or to FICA. The structure can save the 15.3 percent payroll tax on the distribution portion, but only if the wage portion is reasonable compensation for the services actually performed by the owner.

The reasonable compensation requirement for S corporation owners is the central limit on the self-employment tax savings. The IRS has long taken the position that an S corporation must pay reasonable compensation for services performed by a shareholder-employee before paying non-wage distributions. The Tax Court has supported this position in cases such as David E. Watson, P.C. v. United States, where the court reclassified a low salary plus large distributions as additional wages. The IRS publishes guidance on reasonable compensation factors, and various professional sources have published valuation methodologies for owner compensation.

The factors generally include the services performed by the owner, the time and effort devoted to the business, the comparable wages of similarly situated employees in the same industry and region, the use of formulas tied to revenue or profit, distributions to other shareholders, the amount paid to non-shareholder employees, and the corporation's overall profitability. The most defensible approach uses an explicit benchmark drawn from compensation surveys, an industry-specific reasonable compensation analysis, or a market salary for the role the owner plays in the business.

A weak position is one in which an owner who is the only worker, generating most of the revenue personally, takes a small W-2 salary and large distributions. A strong position is one in which the owner has documented evidence that the W-2 salary matches a market salary for the work performed, with distributions reflecting profit beyond compensation. The difference between the two positions is the difference between accepting and contesting an IRS reclassification.

Distributions from an S corporation are not necessarily tax-free. They are tax-free up to the shareholder's stock basis, then can become capital gains beyond that. Stock basis is increased by income items reported on Schedule K-1 and reduced by losses, deductions, and prior distributions. A shareholder who is not paying attention to basis can distribute more than basis and trigger capital gain on the excess. The same dynamic applies to debt basis when distributions occur after losses have absorbed stock basis.

For a profitable single-owner S corporation, the basis is usually adequate, and distributions are typically tax-free. For a corporation with prior losses, distributions can be more complicated, and the order of basis adjustments matters. The shareholder should maintain a basis schedule that tracks the original capital contribution, allocated income, allocated deductions, and prior distributions. The IRS now requires a Form 7203 attached to many shareholder returns to document basis.

An LLC member's tax treatment of distributions in a default partnership-taxed multi-member LLC also depends on basis, but the LLC mechanics differ from S corporation mechanics. A single-member LLC with disregarded-entity treatment does not deal with basis for distributions because the entity is invisible for income tax purposes.

The qualified business income deduction under IRC Section 199A allows certain noncorporate taxpayers to deduct up to 20 percent of qualified business income from a domestic trade or business operated as a sole proprietor, partnership, S corporation, or other pass-through. The deduction is subject to a complex set of limitations, including a wage and capital limit for higher-income taxpayers and a special rule for specified service trades or businesses. The deduction is taken on Form 8995 or Form 8995-A.

For a sole proprietor or single-member LLC with disregarded-entity treatment, the QBI deduction is computed on the Schedule C net profit, with limits applied at the individual return level. For an S corporation, the W-2 wages paid by the corporation to its employees, including the shareholder-employee, count toward the wage limit. That fact creates an interesting interaction: paying a higher W-2 wage to the owner reduces self-employment tax savings on that wage but increases QBI wages and potentially preserves a larger QBI deduction at higher income levels.

The QBI deduction is not available to C corporations and is generally not available for wages received as an employee. Specified service trades or businesses, including services in the fields of health, law, accounting, actuarial science, performing arts, consulting, athletics, financial services, brokerage services, and any trade or business where the principal asset is the reputation or skill of one or more employees, face additional limitations once income exceeds the threshold amounts that are indexed each year.

Consider a single owner with $200,000 of net profit before owner compensation, in a non-specified service trade. As a sole proprietor or default single-member LLC, all $200,000 is subject to self-employment tax computed on Schedule SE, with the deductible portion offset adjusting net earnings. The Section 199A deduction can apply at the individual return level subject to the income thresholds.

As an S corporation, suppose the owner pays a defensible W-2 salary of $90,000 to herself, leaving approximately $110,000 of distributions after the wage and the employer share of payroll tax. The W-2 wages are subject to FICA, the employer matches FICA, and the distributions are not subject to self-employment tax. The QBI deduction on the $110,000 of distributions is computed using the wages paid as part of the wage limit, with W-2 wages of $90,000 supporting the QBI computation. The combined federal tax under the S corporation election is often lower than the sole proprietorship structure at this profit level, but the savings depend on the actual reasonable compensation, the QBI threshold position, and the cost of running an S corporation.

The cost side of the S corporation election is non-trivial. It includes Form 1120-S annual return, payroll software or service, separate accounting, state-level S corporation rules, possible separate state franchise taxes, and the time required to manage corporate formalities. A reasonable rule of thumb is that the S corporation election begins to provide net savings somewhere between $40,000 and $60,000 of profit above a defensible W-2 salary, but the exact crossover depends on the specific numbers, state rules, and the value the owner places on simplicity.

State tax treatment of these structures varies widely. California imposes an annual minimum franchise tax on LLCs and S corporations and a gross receipts fee on LLCs in some configurations. New York City has an unincorporated business tax that applies to sole proprietors and partnerships but not to S corporations, although New York State has its own complications. Tennessee historically had an excise and franchise tax that affected pass-throughs. Several states do not recognize the federal S corporation election and tax the entity as a C corporation for state purposes unless a separate state election is filed.

State pass-through entity tax elections, often called PTET, allow many states to give pass-through owners a federal deduction for state income tax above the federal $10,000 SALT cap. The entity pays state income tax at the entity level, gets a federal deduction for that state tax, and the owner gets a state credit on the personal return. The election is available in most high-tax states and can produce material federal tax savings for owners in those states.

State-level analysis is essential. The federal comparison alone can be misleading. A federal advantage to the S corporation election can be reduced or eliminated by state-level treatment, and vice versa. Owners should run the comparison at federal and state levels together rather than picking the entity on federal numbers alone.

For owners with low or unstable profit, the sole proprietor or single-member LLC path is usually the right choice. The compliance cost is low, the federal mechanics are straightforward, and the QBI deduction is still available subject to income limits. Liability protection is the main argument for the LLC over the sole proprietorship in this range, with the federal tax outcome unchanged.

For owners with moderate to high profit, the S corporation election starts to look attractive. The crossover depends on the reasonable compensation analysis. An owner who would justify a $90,000 reasonable salary for the role and is generating $250,000 of profit can save several thousand dollars per year in self-employment tax even after S corporation compliance costs, with QBI implications layered on top. An owner who would justify only a $200,000 reasonable salary for a $250,000 profit business is unlikely to save anything.

For owners considering specified service trades or businesses or expecting fast revenue growth, the analysis is more complex. SSTB classification can limit QBI at higher income, which changes the comparison. Investors, partners, or potential acquirers may have preferences for entity structure that override pure tax savings. State-level rules can flip federal advantages.

This page focuses on sole proprietor, LLC, and S corporation paths. A C corporation is a separate option, with a flat 21 percent federal corporate tax rate and the historical disadvantage of double taxation on dividends. C corporations can be attractive for owners who plan to retain earnings inside the business for years, who want to issue qualified small business stock under IRC Section 1202, or who plan to raise venture capital that requires a Delaware C corporation. They are usually not attractive for owners who plan to take all profits out as personal income each year.

Switching from a pass-through entity to a C corporation has tax consequences, including potential built-in gains issues if a former S corporation later converts to C status and back. The decision should be paired with the long-term capital plan rather than isolated to the current year's tax bill.

Primary references for this page are IRS Publication 535 on business expenses, IRS Publication 542 on corporations, and the IRS small business and self-employed pages at irs.gov/businesses/small-businesses-self-employed. The S corporation election is on Form 2553, the S corporation return is Form 1120-S, and the QBI deduction forms are Form 8995 and Form 8995-A. The basis form for S corporation shareholders is Form 7203. The leading reasonable compensation case is David E. Watson, P.C. v. United States, 668 F.3d 1008 (8th Cir. 2012). Statutes referenced include IRC Sections 1401 through 1403 for self-employment tax, 1361 through 1379 for S corporations, and 199A for the QBI deduction.