Entity selection is a tax-driven decision, not a legal-driven one for most businesses. The common LLC-vs-S-corp question usually translates to: "should my LLC elect S-corp tax treatment?" This guide covers the practical decision factors, payroll mechanics, and the income ranges where S-corp election starts making sense. Written for operating business owners, not legal entity formation details.
Most online content treats "LLC vs S-corp" as a single comparison. It isn't. LLC is a legal entity structure created under state law. S-corp is a federal tax election. They're different kinds of things; you can have an LLC that's taxed as an S-corp, and many businesses do.
The actual question most business owners are asking: "should my LLC file as a partnership / sole proprietorship / disregarded entity, or should it elect S-corp tax treatment?" That's the real decision. The legal entity (LLC) doesn't change; only the tax election does.
For most operating businesses, the relevant comparison is between the first two (default LLC taxation) and the third (LLC with S-corp election). The fourth (C-corp election) rarely makes sense for an LLC – if C-corp is the goal, you typically form as an actual corporation rather than an LLC electing C-corp.
All business income flows through to owner's personal tax return. All of it is subject to:
The self-employment tax is the big cost. On $100k of business income, a sole prop owes roughly $14,130 in SE tax in addition to income tax.
S-corp election splits business income into two categories:
The savings come from avoiding SE tax on the distribution portion. On $100k of business income with $60k reasonable salary and $40k distribution, the owner saves approximately 15.3% × $40k = $6,120 annually.
S-corp savings come at a cost:
The break-even point depends on several variables, but common rules of thumb:
At low income levels, the administrative costs (payroll, additional tax prep, state-level fees) exceed the SE tax savings. Plus, at low income levels, reasonable salary essentially equals total income, leaving little distribution.
Break-even zone. S-corp might save $1k–$3k annually, which barely covers the additional costs. Some factors that swing the decision:
At this income range, SE tax savings typically run $3k–$12k annually net of additional costs. Clear win for most situations.
Social Security tax caps at $168,600 wages (2026). Above the cap, only Medicare (2.9% base + 0.9% additional) applies. Savings diminish as income goes above the cap because the non-Medicare portion of SE tax (12.4%) doesn't apply.
Very high earners may still benefit from S-corp due to Medicare + retirement planning advantages, but the marginal benefit shrinks.
For multi-member businesses, S-corp has specific restrictions:
Partnerships (default multi-member LLC taxation) don't have these restrictions and can have more flexible economic arrangements (preferred returns, waterfalls, special allocations). For businesses with complex economic arrangements among owners, partnership treatment often works better.
In loss years, partnership treatment allows partners to deduct losses on their personal returns up to their basis. S-corp allows similar but with different basis rules. Both better than C-corp (where losses trap at entity level). If a business expects meaningful losses in early years, flow-through treatment (partnership or S-corp) beats C-corp.
S-corp owners can implement sophisticated retirement strategies: solo 401(k), SEP-IRA, defined benefit plans. Partnership owners have similar options but with different mechanics. Generally, both allow retirement tax-advantaged saving better than pure sole proprietorship.
Business buyers often prefer buying assets rather than stock. LLC structure makes asset sales flexible. S-corps can do asset sales but have some specific tax issues (built-in gains for recently-converted S-corps). For businesses with plan to sell within 5–10 years, consider exit structure early.
Section 199A Qualified Business Income deduction (20% deduction for qualified business income) applies to pass-through entities including S-corps and partnerships. Calculation differs slightly between the two; planning matters for businesses in phase-out ranges.
Related: bookkeeping for startups, tax preparation services.
Related