S-Corp vs. LLC vs. C-Corp: A Practical Guide to Choosing

When starting or restructuring a business, few decisions carry more long-term financial weight than your entity type. The S-Corp vs. LLC vs. C-Corp question is one of the most common in small business finance, and for good reason: each structure comes with real tax, legal, and operational trade-offs that depend on where your business is today and where it is headed. The rules also shifted meaningfully when the One Big Beautiful Bill Act (OBBBA) became law on July 4, 2025, so advice written even a year or two ago may already be stale. Here is where each structure stands for the 2026 tax year.

LLC: Simplicity and Pass-Through Tax

A Limited Liability Company is the most flexible and easiest structure to maintain. LLCs offer personal liability protection without the formality requirements of a corporation. For tax purposes, a single-member LLC is disregarded by default and taxed like a sole proprietorship, while a multi-member LLC defaults to partnership treatment. Profits flow directly to the owners’ personal returns.

The catch is self-employment tax. The SE tax rate is 15.3% — 12.4% for Social Security and 2.9% for Medicare — and it applies to essentially your entire net profit (technically, 92.35% of it, per IRS Topic 554). For 2026, the Social Security portion applies to the first $184,500 of earnings, per IRS Publication 15 (2026); the 2.9% Medicare portion has no cap, and an additional 0.9% Medicare tax kicks in above $200,000 of earnings ($250,000 for joint filers). That structure is efficient at lower income levels but becomes increasingly expensive as profits grow — which is typically when owners start weighing the S-Corp vs. LLC vs. C-Corp question seriously.

C-Corp: A Flat 21% Rate, but Double Taxation

A C-Corporation pays corporate income tax at the entity level at a flat 21% rate under IRC Section 11(b). That rate was made permanent by the 2017 Tax Cuts and Jobs Act — unlike the individual-side TCJA provisions, it never had an expiration date, and OBBBA left it unchanged. When profits are then paid out to shareholders as dividends, they are taxed a second time on the individual return. Qualified dividends are taxed at the 0%, 15%, or 20% capital-gains rates; for 2026, Rev. Proc. 2025-32 sets the 0% rate up to $49,450 of taxable income for single filers ($98,900 joint), with the 20% rate starting above $545,500 ($613,700 joint). Higher earners also owe the 3.8% net investment income tax on dividends.

Stack those layers and the combined federal rate on distributed C-Corp profits can run from the mid-30s to nearly 40 percent. This C-Corp double taxation is the structure’s biggest drawback for owner-operated businesses that distribute their profits, and it is why most small business owners move away from it once they run the numbers.

There is a genuine bright spot for startups, though. OBBBA significantly expanded the qualified small business stock (QSBS) exclusion under IRC Section 1202, which only C-Corp stock can qualify for. For stock acquired after July 4, 2025, the old all-or-nothing five-year rule became a tiered exclusion — 50% of gain excluded after a three-year holding period, 75% after four years, and 100% after five — with the per-issuer gain cap raised from $10 million to $15 million and the company-size limit raised from $50 million to $75 million in aggregate gross assets. Combined with investor expectations, this is why companies pursuing venture capital or an eventual IPO are almost always C-Corps. For the typical profitable service business that pays its profits out to the owner, the double-tax cost usually outweighs these benefits.

S-Corp Tax Benefits: The Middle Ground

S-Corps combine the pass-through treatment of an LLC with the ability to reduce self-employment taxes, which is the main reason most profitable small businesses make the switch. As an S-Corp owner-employee, only your W-2 salary is subject to Social Security and Medicare payroll taxes. Distributions beyond that salary pass through to your personal return without triggering self-employment tax. The salary cannot be a token amount — the IRS requires reasonable compensation for the services you actually perform, and it can reclassify distributions as wages if you underpay yourself. We cover how to set that number in our guide to the S-Corp reasonable salary.

Not every business can elect S status. Per the IRS eligibility rules, the entity must be domestic, have no more than 100 shareholders, have only one class of stock, and its shareholders must be individuals, certain trusts, or estates — no partnerships, corporations, or nonresident alien shareholders. Certain financial institutions, insurance companies, and DISCs are ineligible entirely. If you plan to bring on an institutional investor or issue preferred stock, the S-Corp is off the table, and the one-class-of-stock rule alone rules it out for most venture-backed companies.

The QBI Deduction: A Pass-Through Advantage Made Permanent

One more thumb on the scale for pass-through entities: the qualified business income (QBI) deduction under IRC Section 199A lets owners of LLCs and S-Corps deduct up to 20% of qualified business income. This deduction was scheduled to expire after 2025, but OBBBA made it permanent — a point in favor of pass-through structures that older S-Corp vs. LLC vs. C-Corp comparisons miss. For 2026, the wage-and-property limits and the specified-service-business phase-out begin at $201,750 of taxable income ($403,500 for joint filers), phasing in fully by $276,750 ($553,500 joint), per Rev. Proc. 2025-32. OBBBA also added a $400 minimum deduction for taxpayers with at least $1,000 of QBI from an active business. C-Corp income never qualifies. For a deeper dive on what changed, see our complete OBBBA guide for S-Corp owners.

S-Corp vs. LLC vs. C-Corp: Choosing the Best Business Structure for You

The best structure for a small business depends on three factors: current income, growth plans, and administrative bandwidth. Starting out or earning modest profits: an LLC keeps things simple — one return, no payroll, full flexibility. Consistently profitable and owner-operated: an S-Corp is typically the most tax-efficient choice once net profit is comfortably into five figures, because the payroll-tax savings outgrow the cost of running payroll and filing a separate return. As a rule of thumb (not an IRS threshold), many practitioners put that crossover somewhere around $40,000–$50,000 of consistent annual profit, but the right answer depends on your reasonable salary and state costs. Raising venture capital or planning to go public: a C-Corp is effectively the only option, and the expanded Section 1202 exclusion sweetens it considerably for founders and early investors.

Remember that these choices are rarely permanent. Many owners start as an LLC and elect S-Corp taxation as income grows — the LLC stays intact and only the tax treatment changes. We walk through the mechanics, deadlines, and break-even math in our guide on how to convert an LLC to an S-Corp. Whichever way you lean in the S-Corp vs. LLC vs. C-Corp decision, revisit it annually with a CPA who understands the full trade-off picture — and if you want that second opinion, contact us.