Single-Member LLC vs S-Corp: Tax Comparison
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The most common entity question — and it has a math answer
If you own a single-member LLC making decent money, you've probably heard the pitch: "Elect S-Corp status and save thousands in self-employment tax." It's true — sometimes. It's also wrong often enough to be expensive. The decision is a numbers problem, not a marketing problem, and the answer depends on three things: how much profit you make, how much salary the IRS would consider reasonable for your work, and whether you're willing to run real payroll every two weeks for the rest of your business life.
By default, a single-member LLC is a "disregarded entity" — invisible to the IRS for income tax. You report business profit on Schedule C of your personal Form 1040 and pay self-employment tax on every dollar of net earnings. An S-Corp election (filed via Form 2553) flips that. Your LLC stays an LLC under state law, but the IRS now treats it as an S corporation. You pay yourself a W-2 salary, and the rest of the profit comes out as distributions that skip the 15.3% self-employment tax. That's where the savings come from. That's also where the trap is.
How each one is taxed
The mechanical difference between the two structures is the single most important thing to understand before you decide.
The legal entity is identical. Same LLC name on your bank account, same operating agreement, same state filing. What changes is the federal tax classification — and that one change creates a brand-new compliance stack you didn't have before.
The self-employment tax mechanics
Self-employment tax is the part most owners underestimate when they first see their tax bill. It's not income tax — it's payroll tax that a W-2 employee normally splits with their employer. When you're self-employed, you pay both halves. Here's the 2026 breakdown:
Medicare: 2.9% on all net SE earnings (no cap)
Additional Medicare: +0.9% on earnings above $200,000 (single) or $250,000 (MFJ)
Combined base rate: 15.3% on earnings up to the SS wage base
Half of SE tax is deductible above the line on Form 1040.
That 15.3% only stops on Social Security at $184,500. Medicare keeps running on every dollar of profit you make. So if you're a Schedule C filer earning $300,000 in net profit, you're paying SE tax on all $300,000 — not just the salary portion of it. An S-Corp elector at the same profit might pay payroll tax on $120,000 of W-2 wages and zero FICA on the remaining $180,000 of distributions. That's the whole game.
Where the breakeven actually lands
The S-Corp election creates real savings, but it also creates real costs. You'll pay $1,500–$3,500/year for a separate 1120-S return, $500–$1,500/year for payroll software (Gusto, ADP, Paychex), and possibly state-level S-Corp surtaxes or franchise fees. Total annual compliance cost typically runs $3,500–$5,000 once you're set up. That cost is fixed — it doesn't scale with profit.
Below roughly $75,000–$80,000 in net profit, the FICA savings on distributions don't cover the new compliance bill. Above $120,000, the math gets compelling. Above $200,000, it's almost a no-brainer for most domestic operating businesses. Here's how it works at three income levels, assuming a defensible 50% reasonable salary split:
As S-Corp: Salary $40K → FICA $6,120 | Distribution $40K → no FICA
FICA savings: $11,304 − $6,120 = $5,184
Less compliance cost: ~$4,000
Net savings: ~$1,184 — barely worth the headache.
As S-Corp: Salary $60K → FICA $9,180 | Distribution $60K → no FICA
FICA savings: $16,956 − $9,180 = $7,776
Less compliance cost: ~$4,000
Net savings: ~$3,776 — the math starts working.
As LLC (Schedule C): SS portion 12.4% × $184,500 (capped) = $22,878 + Medicare 2.9% × $184,700 = $5,356
Total SE tax: $28,234
As S-Corp: Salary $90K → FICA $13,770 | Distribution $110K → no FICA
FICA savings: $28,234 − $13,770 = $14,464
Less compliance cost: ~$4,500
Net savings: ~$9,964/year — clearly worth it.
Two things drive these numbers: the salary split percentage and the Social Security wage base. Once your profit gets high enough that the salary alone exceeds $184,500, the savings from converting profit to distribution are limited to the 2.9% Medicare portion — still real money on big income, but the 12.4% Social Security savings are gone.
Worked example — Sarah at $130K decides
Sarah is a US-based brand designer running a Florida single-member LLC. Her business has been profitable for three years and she's now consistently clearing about $130,000 in net profit. She works alone, no employees. She came across the S-Corp pitch on YouTube and wants to run the actual numbers.
- Current setup: Single-member LLC, Schedule C on Form 1040, no payroll
- 2026 SE tax as-is: $130,000 × 92.35% × 15.3% = $18,369
- Reasonable salary if she elects S-Corp: $65,000 (50% of profit, supported by Bureau of Labor Statistics data for senior brand designers in her market)
- FICA on $65K salary: $9,945 (her S-Corp pays half, she pays half — same total either way)
- Distribution: $65,000 — no FICA, no SE tax
- Gross FICA savings: $18,369 − $9,945 = $8,424
- New compliance costs: ~$4,200 (Form 1120-S prep $1,800, Gusto payroll $600, Florida has no state corporate income tax, Form 7203 basis tracking included)
- Net annual savings: ~$4,200/year
Sarah elects S-Corp by filing Form 2553 before March 16, 2026. She'll save about $4,200/year — roughly $33,000 over an eight-year holding period before she sells the business. She also gets cleaner financials, simpler retirement plan options (Solo 401(k) elective deferrals tied to W-2 wages), and a paper trail that makes her business easier to value if she ever wants to sell. The downside: every two weeks for the rest of her business life, she runs payroll. She also can't just "take money out" the way she used to — withdrawals are now distributions tracked against her basis on Form 7203.
The reasonable salary trap
This is where most owners get into trouble, and it's the single most-audited issue on S-Corp returns. The S-Corp election only saves payroll tax on the distribution portion of profit. If you elect S-Corp and pay yourself a $1 salary while pulling $130,000 in distributions, you didn't save $19,000 in payroll tax — you committed tax fraud and the IRS will recharacterize the distributions as wages, with penalties and interest.
Documentation expected: Bureau of Labor Statistics wage data for your role and metro area
Penalty if recharacterized: Back FICA tax (15.3% × understated wages) + 25% failure-to-deposit + interest
Statute of limitations: Three years from filing — but unlimited if the IRS calls it fraud
Common red flag: Salary < $40K with distributions > $100K and no other employees
If your salary is too low and you get audited, the IRS will reclassify distributions as wages going back through every open year. The recovery is brutal — you owe both halves of FICA, the late-deposit penalty, and interest, often on three years of returns simultaneously. Set a defensible salary from day one. Update it annually based on your actual workload and current wage data.
State-level considerations
Federal tax savings are only half the story. Several states layer their own taxes on S-Corps that can erase part of the federal benefit:
- California: 1.5% franchise tax on S-Corp net income, with an $800 minimum annually. On $130,000 of S-Corp profit, that's $1,950 — wipes out roughly half of a small federal saving.
- New York City: Doesn't recognize S-Corp status. NYC general corporation tax of 8.85% applies regardless of federal election.
- New Jersey: Requires a separate state-level S-Corp election (CBT-2553). Without it, the state taxes you as a C-Corp.
- Tennessee: Excise tax of 6.5% on S-Corp net earnings — federal pass-through doesn't apply at the state level.
- Florida, Texas, Wyoming, South Dakota, Nevada: No state corporate income tax. Federal savings flow through cleanly.
Sarah's Florida residency is part of why her S-Corp math works so cleanly. If she lived in California with the same $130K profit, the $1,950 franchise tax would cut her net annual savings from $4,200 down to roughly $2,250 — still positive, but the calculus tightens. Run state taxes through the analysis before you file Form 2553, not after.
QBI deduction — does it change the answer?
The Section 199A Qualified Business Income deduction lets pass-through owners deduct up to 20% of business income. Both LLCs and S-Corps qualify. For 2026, the One Big Beautiful Bill Act made QBI permanent and raised the phase-in threshold to $201,775 (single) / $403,500 (MFJ).
Below the threshold, the deduction works the same way for both entities — you get the full 20% on qualified income. Above the threshold, things diverge: the QBI deduction starts limiting based on W-2 wages paid by the business. An S-Corp paying a real salary helps satisfy that wage limitation; a sole-prop LLC has no W-2 wages and can lose part of the deduction at higher income levels. For Sarah at $130K, this doesn't move the needle — she's well below the threshold either way. For owners earning $250K+, QBI mechanics start meaningfully favoring the S-Corp side of the analysis.
Common mistakes
- Electing S-Corp at $50K profit "to save on taxes": The compliance cost exceeds the FICA savings. You're paying $4,000 to save $3,000.
- Setting an unreasonably low salary: Audit bait. The IRS publishes guidance on this and tracks salary-to-distribution ratios across S-Corps. Anything below 30% draws scrutiny.
- Forgetting to actually run payroll: An S-Corp owner who took $130K out as "distributions" with no W-2 issued has filed a return that doesn't match reality. The IRS will reclassify everything as wages.
- Ignoring state-level surtaxes: California, Tennessee, NYC, and others tax S-Corps differently. Federal-only analysis misses real money.
- Filing Form 2553 late and assuming it's fine: March 16, 2026 is the cutoff for 2026 status. File March 17, and your election doesn't take effect until 2027 — unless you qualify for late election relief under Rev. Proc. 2013-30.
Frequently asked questions
The math typically starts working at $75,000–$80,000 in net profit and becomes clearly worth it above $120,000. Below $75K, the $3,500–$5,000 in new compliance costs (1120-S prep, payroll software, possible state surtaxes) eat the FICA savings. The exact breakeven depends on what reasonable salary your industry supports and whether your state imposes an S-Corp surtax.
Yes — you revoke the election by sending a written revocation statement to the IRS service center where you filed Form 2553. There's no specific revocation form. Once you revoke, you generally cannot re-elect S-Corp status for five years without IRS consent. The five-year lockout is real, so don't elect lightly.
For most owners below the 2026 threshold of $201,775 single / $403,500 MFJ, no — both entities get the full 20% deduction. Above the threshold, the QBI calculation starts limiting based on W-2 wages paid by the business, which can favor S-Corps that pay real salaries. The OBBBA made QBI permanent in July 2025, so this is now a long-term planning factor rather than a short-term one.
There's no IRS-published bright line. Defensible practice is 40–60% of total owner compensation, supported by Bureau of Labor Statistics wage data for your role and metro area, your industry, and the time you actually spend working in the business. An owner who handles all client work, sales, and operations should pay themselves more salary than one who has employees doing most of the work. Document your reasoning in writing each year.
For a new entity, you have two months and 15 days from the earliest of: your first shareholder, your first asset acquisition, or the date you began doing business — whichever comes first. So an LLC formed in May 2026 generally has until mid-July to file Form 2553 for 2026 S-Corp status. The standard March 16 deadline only applies to existing businesses converting from a previous tax year.
Yes. The S-Corp election is a federal tax classification — it doesn't create a legal entity. You need either an LLC or a corporation chartered with a state to make the election. Most small-business owners use an LLC and elect S-Corp tax treatment, which gives them LLC liability protection plus S-Corp tax benefits. The state-level entity stays an LLC; only the IRS treats it as an S-Corp.
California (1.5% franchise tax + $800 minimum), Tennessee (6.5% excise tax on S-Corp earnings), and New York City (no S-Corp recognition, 8.85% NYC corporate tax) are the worst-case states for federal S-Corp savings. New Jersey requires its own separate S-Corp election. Florida, Texas, Wyoming, Nevada, and South Dakota have no state corporate income tax, so federal savings flow through cleanly. Always model both federal and state tax under both structures before electing.
This article provides general information about US tax topics and is not a substitute for personalized advice from a qualified tax professional. Tax law changes frequently — verify current rules with a tax professional before filing or making decisions based on this content.
