The “which entity should I be?” question comes up constantly — and the answer is almost always the same: it depends on your income, your plans, and what you’re trying to optimize for. The conversation gets muddled because people conflate legal structure with tax classification, assume the same answer applies at every income level, and take advice from people in very different situations than their own.

Here’s a clean breakdown of how each structure actually works for tax purposes and where the crossover points tend to be, including the LLC vs S-Corp vs C-Corp math that determines which one saves you money.

The Baseline: What an LLC Actually Is

A Limited Liability Company (LLC) is a legal structure, not a tax classification. On its own, the IRS doesn’t recognize “LLC” as a tax category. By default:

A single-member LLC is taxed as a sole proprietorship — all income flows to your personal return on Schedule C, and you pay self-employment tax (15.3% on the first $184,500 of net earnings in 2026, 2.9% above that) on 100% of your net profit.

A multi-member LLC is taxed as a partnership — income flows to each member’s personal return proportionally, and self-employment tax applies to each partner’s share of earned income.

This default treatment is fine when income is low, the business is new, or the compliance overhead of a more complex structure isn’t worth the savings. But as net profit grows, self-employment tax becomes the dominant cost driver, and the LLC default becomes expensive.

The S-Corp Election: Where Most Small Businesses Land

An S-Corp is not a legal entity — it’s a tax election (via Form 2553) that an LLC or corporation can make with the IRS. When an LLC elects S-Corp treatment, it changes how the income is taxed: instead of all net profit being subject to self-employment tax, the owner pays themselves a “reasonable salary” as a W-2 employee of their own business. The salary is subject to payroll taxes (employer + employee FICA). The remaining profit is taken as a distribution — and distributions are not subject to self-employment or payroll taxes.

The savings come from that distribution portion. If your business nets $200,000 and the IRS agrees your reasonable salary is $80,000, you pay payroll taxes only on $80,000 instead of $200,000. At the combined 15.3% SE tax rate, that’s roughly $18,000 in savings — minus the incremental cost of payroll processing and an S-Corp tax return.

That math is why S-Corp elections typically start making sense around $60,000 to $80,000 in net profit. Below that threshold, the cost of maintaining the structure — payroll, bookkeeping, an extra tax return — often erodes the savings. Above it, the delta grows quickly.

Important: S-Corps have restrictions. They cannot have more than 100 shareholders, cannot have foreign shareholders, cannot have corporations or partnerships as shareholders, and can only have one class of stock. These constraints matter if you plan to raise outside capital or bring in investors.

The C-Corp: When It Actually Makes Sense

A C-Corp is a separate taxpaying entity with its own flat rate: 21%. It’s also the default structure for venture-backed startups and any company planning to go public.

The C-Corp’s primary tax advantage comes in specific circumstances: when you plan to leave money inside the business and reinvest it, when you’re building a company to sell and can access Qualified Small Business Stock (QSBS) exclusions under Section 1202, or when you need to attract institutional investors who can’t participate in pass-through entities.

The One Big Beautiful Bill Act reshaped Section 1202 for QSBS acquired after July 4, 2025. The five-year holding period is no longer all-or-nothing: stock held at least three years now qualifies for a 50% gain exclusion, four years for 75%, and five years still gets the full 100% exclusion. The per-issuer gain exclusion cap also rose from $10 million to $15 million (now inflation-adjusted), and the aggregate gross asset threshold for the company to qualify increased to $75 million. This makes QSBS planning relevant to more companies and gives founders a meaningful partial benefit even on an earlier exit — but the older rules still apply to stock acquired before July 4, 2025, so the acquisition date matters.

The C-Corp’s primary disadvantage is double taxation for business owners who want to pull money out: the corporation pays 21% on its profits, and then you pay dividend or capital gains taxes when you distribute. If your goal is to draw a salary and take most profits personally, a C-Corp is almost never the right answer.

For small businesses operating as professional service providers, retailers, or service companies below $10 million in revenue, a C-Corp is rarely the optimal structure. The exceptions are businesses with a clear exit horizon where Section 1202 exclusions apply, or those that need to retain significant capital inside the business at the 21% rate rather than paying individual rates up to 37%.

The QBI Deduction Factor

The Qualified Business Income (QBI) deduction — Section 199A — allows pass-through entity owners (sole proprietors, S-Corps, partnerships) to deduct up to 20% of qualified business income from their taxable income, subject to limitations. The deduction was originally set to expire after 2025, but the One Big Beautiful Bill Act made it permanent, so it’s no longer a sunsetting provision to plan around.

OBBBA also widened the phase-out mechanics for 2026 and later: the phase-out threshold for “specified service trades or businesses” (SSTBs) — law, consulting, healthcare, financial planning, and similar fields — rises to $201,775 for single filers and $403,500 for joint filers in 2026, and the phase-out range itself was expanded from $50,000/$100,000 to $75,000/$150,000 (single/joint), meaning the deduction now fully disappears at $276,775 (single) and $553,500 (joint). OBBBA also added a new minimum QBI deduction of $400 for taxpayers with at least $1,000 of qualified business income from an active trade or business, starting in 2026.

This deduction makes pass-through status significantly more valuable at lower and middle income levels. At the highest incomes, the phase-out — combined with S-Corp salary requirements — can still shift the calculus, even though the deduction itself is now a permanent fixture rather than an expiring one.

Frequently Asked Questions

Q: Can my LLC be taxed as an S-Corp without forming a corporation?
A: Yes. An LLC can make an S-Corp election with the IRS, which changes only the tax treatment, not the legal structure. You keep the LLC operating agreement and liability protection while gaining S-Corp tax treatment.

Q: At what point should I switch from S-Corp to C-Corp?
A: Almost never for the typical small business owner who needs to take income personally. The primary scenarios for C-Corp are: you’re building a startup that needs institutional equity, you plan to retain and reinvest most profits inside the business, or you’re pursuing Section 1202 QSBS treatment.

Q: How do states treat these structures differently?
A: Significantly. Some states (like California) charge LLC fees based on gross revenue. Some states don’t recognize S-Corp elections for state tax purposes. State-specific rules can substantially change the break-even calculation. Always run the analysis for your specific state.

Q: Do I need to formally register as something different to elect S-Corp treatment?
A: If you’re already an LLC, you file Form 2553 with the IRS. If you’re a corporation, same process. There’s no separate state filing required for the tax election, though you may still owe the same state compliance fees.

The right entity choice is a decision worth making once with good information rather than repeatedly correcting. The answer usually changes as your income and business goals evolve.

If you’d like to apply this to your situation, the team at Molen & Associates is here to help. Schedule a consultation at molentax.com.