LLC vs. S-Corp: When the Switch Saves Money (2026)

Most self-employed professionals hear "elect S-corp, save on taxes" at some point. Sometimes the advice is right. Sometimes it adds $3,000 in annual compliance costs to save $1,800 in FICA. The answer depends on your profit level, your state, and what your reasonable salary looks like. Here's how to work through the math.

The core tax difference

A single-member LLC (SMLLC) or sole proprietorship is taxed as a disregarded entity by default. All net business profit is subject to self-employment (SE) tax:¹

• SE tax base: net profit × 92.35% (the 7.65% reduction mirrors the employer FICA deduction)
• SE tax rate: 15.3% on the first $184,500 of SE tax base (2026), then 2.9% above that²
• Plus 0.9% Additional Medicare Tax on SE income exceeding $200,000 (single) / $250,000 (MFJ)
• The 50% of SE tax is deductible above-the-line, reducing your income tax — but you still pay all 15.3%

An S-corp changes the structure: you pay yourself a W-2 salary, and FICA taxes (15.3%, employer + employee) apply only to that salary. Profit above the salary flows out as a distribution — not subject to FICA. Since you're the sole shareholder, you effectively pocket the employer FICA half instead of sending it to the IRS.

The break-even math: real numbers

S-corp compliance overhead runs $2,000–$4,000/year for most solo owners: a payroll service ($500–$1,500) plus preparing Form 1120-S ($800–$2,500). You also pay employer FICA on your salary — 7.65% — which the sole-prop gets back as a deduction anyway, so the true incremental FICA cost is the employer half on the distribution you've now moved off the FICA base.

Below is the break-even analysis at four income levels, using a typical "reasonable salary" for each (see the next section for how salary is determined). Compliance overhead assumed at $3,000/year:

SE tax calculation: net profit × 92.35% × 15.3%, capped at $184,500 SS wage base, then 2.9% above. FICA on salary = salary × 15.3% (both halves). 2026 SS wage base: $184,500.

A few things to notice in the table:

• The $80K row barely breaks even. With compliance overhead at $3,000, you need a substantial FICA savings gap to come out ahead.
• The sweet spot is $120K–$300K. Savings are real and growing as income rises while the salary can still be kept well below the SS wage base.
• Savings level off above $200K. Above the $184,500 SS wage base, sole-prop SE tax on the excess is only 2.9% — so the marginal FICA savings from shifting that income out of your S-corp salary shrink. The S-corp salary itself still gets hit at the full 15.3% up to $184,500.

The reasonable salary requirement

The S-corp only saves FICA to the extent you pay yourself a salary below your true total income. The IRS requires that shareholder-employees who provide services receive "reasonable compensation" — essentially what you'd pay an arm's-length employee to do the same work. Artificially low salaries are a known audit trigger.¹

What factors determine a reasonable salary:

• What employees doing the same work earn in your industry and region
• Your qualifications, experience, and hours worked
• The profitability of the business (the IRS notes that high profit relative to salary raises flags)
• Whether you're the primary revenue-generating employee or a support role

Some practical guardrails for common situations:

The S-corp reasonable salary isn't purely a tax decision — it's a compliance position. If the IRS recharacterizes your distribution as wages (which they can do retroactively), you'll owe back FICA, penalties, and interest. Use the S-Corp Reasonable Salary Calculator to see defensible ranges by role, experience, and business profit.

The QBI deduction interaction

Above the Section 199A phase-out thresholds ($201,775 for single filers, $403,500 for MFJ in 2026), the QBI deduction becomes limited by a W-2 wage test: the deduction is capped at 50% of W-2 wages paid by the business.³

This is where entity structure interacts with QBI in a non-obvious way:

• Sole proprietor above the threshold: No W-2 wages (you don't pay yourself wages). The 50%-of-W-2-wages limitation may reduce or eliminate your QBI deduction unless you have qualifying property (UBIA test).
• S-corp owner above the threshold: Your W-2 salary from the S-corp counts as "W-2 wages" for the limitation. A $100,000 salary creates a $50,000 QBI deduction cap — which may let you preserve some deduction that a sole prop in the same income range would lose.

Example — $450,000 income, single filer, non-SSTB business:

• Sole prop: zero W-2 wages → QBI deduction limited to $0 (assuming no significant depreciable property)
• S-corp with $120,000 salary: W-2 wages = $120,000 → QBI limit = 50% × $120,000 = $60,000 → QBI deduction = $60,000
• The S-corp's QBI benefit: $60,000 × 23% rate = $13,800 more in deductions

State-specific overhead

Federal FICA savings are only part of the picture. Your state's treatment of S-corps can change the math significantly.

California

California does not respect the S-corp FICA structure for state tax purposes the way it does federally. California imposes a franchise tax on S-corps:⁴

• Rate: 1.5% of S-corp net income
• Minimum: $800/year, regardless of profit or loss

At $150,000 of S-corp net income, California charges $800 + $1,500 × 1% ... wait — at $150K it's 1.5% of $150K = $2,250 minimum. Total: $800 + $2,250 = $3,050 in California franchise tax on top of your normal personal income tax. This effectively raises your compliance overhead in California by $2,000–$5,000+ depending on income level, shifting the break-even point upward to roughly $150,000 of net profit for most California residents.

Other states

Most states follow federal S-corp pass-through treatment without the California-style surcharge. A few to check if you're located there:

• New York: S-corps pay a fixed-dollar franchise tax based on receipts ($25–$200K range) — generally modest
• New Hampshire: Business Profits Tax applies to S-corp income at 7.5%
• Tennessee: Franchise and excise tax applies to S-corp net worth
• Most other states: Pass-through treatment with minimal additional S-corp tax

How to make the S-corp election

S-corp status is elected by filing Form 2553 (Election by a Small Business Corporation) with the IRS.⁵

Timing rules:

• For the election to take effect in the current tax year: File no later than 2 months and 15 days after the start of the tax year (March 15 for calendar-year businesses). You can also file anytime during the preceding tax year.
• For a newly formed entity: File within 2 months and 15 days of the formation date for the election to be effective from day one.
• Late elections: The IRS grants relief for late elections under Rev. Proc. 2013-30 if you can show reasonable cause. A late election can be granted up to 3 years and 75 days after the intended effective date. This covers most "I forgot to file" scenarios.

Existing multi-member LLC: If your LLC is currently taxed as a partnership (more than one member), you first file Form 8832 to be treated as a corporation, then file Form 2553 to elect S-corp status. Single-member LLCs can skip Form 8832 and file 2553 directly.

Once you've elected: The election stays in place until you voluntarily revoke it (requires more than 50% shareholder consent) or the IRS terminates it (e.g., you accidentally add a non-eligible shareholder). If you revoke the election, you generally cannot re-elect S-corp status for 5 years without IRS consent.

Ongoing requirements once elected:

• Run payroll at least quarterly (you must be a W-2 employee of your own S-corp)
• File Form 1120-S annually (S-corp tax return) plus Schedule K-1 to yourself
• Keep a separate business bank account (this should be true for any entity, but S-corps require stricter formality)
• File any required state S-corp returns

When to stay a sole proprietor / single-member LLC

The S-corp isn't always the right answer. Stay with the simpler structure when:

• Net profit under $80,000–$100,000. Compliance costs are likely to match or exceed FICA savings. Keep your structure simple and revisit once income grows.
• You're in California with modest profit. The 1.5% California franchise tax shifts your break-even to ~$150,000. Below that, sole proprietorship is often cheaper in total.
• You're already above the Social Security wage base in other income. If you have a W-2 job paying $200,000+ alongside self-employment income, you've already hit the $184,500 SS wage base. The marginal FICA savings on SE income above that base are only 2.9% — far harder to justify S-corp overhead.
• You plan to exit or sell the business soon. Certain deal structures (particularly QSBS qualification under § 1202) require the business to be a C-corp. S-corp elections and asset sales interact in complex ways at exit — talk to an advisor before committing to an entity structure if an exit is on the horizon.
• Business income is highly variable. If your income swings dramatically year-to-year (feast-or-famine freelancing, project-based work), the fixed overhead of S-corp compliance may not be worth it in the lean years.
• You carry significant business losses. S-corp loss limitations are tied to your basis — which takes into account capital contributions and loans from the shareholder. Consult a CPA if your business has losses, as the entity choice can affect how and when you can deduct them.

The decision sequence

If you're evaluating the switch, work through this in order:

1. Estimate your net profit for the year (after business deductions, before retirement contributions).
2. Run the FICA math: what does your state add to the overhead? (For California: add 1.5% × net income + $800.) Does the net savings exceed $3,000–$4,000 in compliance costs?
3. Determine your reasonable salary using the S-Corp Reasonable Salary Calculator. The salary drives the FICA savings estimate.
4. Check the QBI interaction if your income is near or above the phase-out ($201,775 single / $403,500 MFJ). The QBI Deduction Optimizer shows whether an S-corp structure recovers QBI deduction through the W-2 wage limitation.
5. Check how the election interacts with your retirement plan. S-corp owners must take a W-2 salary to make solo 401(k) employee deferrals — unlike sole props, who can defer based on net SE income. Different math for contribution limits. The Retirement Plan Selector models both structures.
6. Talk to a fee-only advisor who works with self-employed owners before filing Form 2553. The entity choice affects retirement plan design, exit planning, state taxes, and QBI — not just FICA. A specialist who does this regularly often identifies $5,000–$20,000 of additional optimization beyond the basic FICA math.

Sources

1. IRS — S Corporations. Overview of S-corp requirements, shareholder eligibility, reasonable compensation requirement, and pass-through taxation. The "reasonable compensation" standard is stated as a condition for shareholder-employees providing services to the corporation.
2. IRS — Self-Employment Tax (Social Security and Medicare Taxes). 2026 SE tax rate: 15.3% (12.4% SS + 2.9% Medicare). Social Security wage base: $184,500 for 2026. SE tax base = net SE income × 92.35%. Additional Medicare Tax (0.9%) on SE income over $200,000 single / $250,000 MFJ.
3. IRS — Section 199A QBI Deduction FAQs. W-2 wage limitation (50% of W-2 wages, or 25% of W-2 wages + 2.5% of UBIA) applies above the phase-out threshold. W-2 wages paid by an S-corp to a shareholder-employee count toward the W-2 wage limitation. 2026 thresholds ($201,775 single / $403,500 MFJ) per IRS Rev. Proc. 2025-45. Cross-checked: IRS Rev. Proc. 2025-45.
4. California FTB — S Corporations. California S-corp franchise tax rate: 1.5% of California net income. Minimum franchise tax: $800/year, due regardless of income or loss. Confirmed via FTB business tax rates page: ftb.ca.gov/file/business/tax-rates.html.
5. IRS Form 2553 Instructions. Election deadline: no more than 2 months and 15 days after the start of the tax year, or anytime during the preceding year. Late election relief per Rev. Proc. 2013-30: IRS Late Election Relief. Late elections granted up to 3 years and 75 days after the intended effective date.

SE tax rate (15.3%) and SS wage base ($184,500) verified against IRS.gov for 2026. QBI phase-out thresholds verified against IRS Rev. Proc. 2025-45. California franchise tax rate verified against FTB.ca.gov. Form 2553 timing rules per IRS Instructions (Rev. December 2020, rules unchanged for 2026). Values subject to change; consult a CPA for your specific entity decision.