Small Business Entity Selection: S Corp Topical Map: SEO Clusters

A C corporation is taxed at the entity level (flat federal corporate tax rate of 21%), which can create double taxation when profits are distributed as dividends. An S corporation and a default-taxed single-member or multi-member LLC are pass-through entities for federal tax purposes, meaning business income generally flows to owners' personal returns; however, S corps require owner-employees to take a reasonable salary subject to payroll taxes while certain LLC member income may be subject to self-employment tax.

Yes — a domestic LLC can elect S corporation tax treatment by filing IRS Form 2553 (and meeting S corp eligibility rules: no more than 100 shareholders, only permitted shareholders such as U.S. citizens or resident aliens and certain trusts, and only one class of stock). The election must generally be filed within 2 months and 15 days of the start of the tax year for which the election applies.

A C corporation is often better when you plan to retain earnings for reinvestment, pursue institutional VC funding, or issue multiple classes of stock and broad equity incentives; C corps also provide clearer rules for public offerings. However, because of entity-level tax and possible double taxation on distributions, they are less tax-efficient for businesses expecting to distribute most profits to owner-operators.

S corporation owner-employees must be paid a reasonable salary subject to payroll taxes (Social Security and Medicare), with remaining profit distributions typically not subject to self-employment tax. LLC members who are active in the business are usually treated as self-employed and pay self-employment tax (approximately 15.3% on net earnings) unless the LLC elects S corp taxation and compensates owners via payroll.

S corporations are limited to 100 shareholders, and shareholders must generally be U.S. citizens or resident aliens, certain trusts and estates — other corporations, partnerships and most nonresident aliens cannot be shareholders. S corps can also have only one class of stock (differences in voting allowed but not in distribution rights).

Conversion complexity depends on the state and the business structure: many states offer statutory conversion processes making an LLC-to-corporation conversion straightforward, while others require forming a new entity and transferring assets (triggering tax consequences). Federal tax consequences (e.g., asset transfers, built-in gains for S corps converting to C corps) should be modeled with a CPA to avoid unexpected tax liabilities.

State traps include entity-level franchise or gross receipts taxes that can erase S corp payroll-tax advantages, mandatory LLC annual fees, differing state treatment of pass-through taxation, and states that do not recognize S corp status for state income tax purposes. Always check the specific state’s franchise taxes, filing fees, and whether the state conforms to federal S corp rules.

S corp distributions flow through to shareholders and are generally tax-free to the extent of basis (but subject to ordinary tax via pass-through income), with dividends not normally used for pass-throughs. C corporation dividends are paid from after-tax corporate earnings and taxed again on shareholders’ returns (qualified dividends taxed at capital gains rates if conditions met). LLC member draws are distributions of equity; taxable treatment depends on basis and whether the LLC is taxed as a partnership or has elected corporate taxation.

C corporations file Form 1120 (corporate income tax return). S corporations file Form 1120-S and issue Schedule K-1s to shareholders. Partnerships (multi-member LLCs default) file Form 1065 and issue Schedule K-1s to partners; single-member LLCs default to disregarded entity status and owner reports income on Schedule C (unless an alternate election is made).

S corporations can issue stock but are limited to one class of stock, which complicates traditional incentive equity such as non-qualified stock option pools and multiple stock classes commonly used by venture-backed startups. For flexible equity plans and preferred stock for investors, a C corporation is typically required.