What an S-corporation actually is
An S-corporation isn't a type of company. It's a tax election. You form an LLC (or sometimes a C-corporation), and then you tell the IRS, via Form 2553, that you'd like the entity taxed as an S-corporation instead of the default. The entity's legal structure doesn't change. Your operating agreement doesn't change. What changes is how income flows to your personal return.
The key difference: an S-corp splits your business income into two buckets. A reasonable salary (W-2 wages) and a distribution. The salary is subject to payroll tax (15.3% Social Security + Medicare). The distribution is NOT subject to payroll tax. That's the entire savings mechanism.
The default vs the S-election in one comparison
Single-member LLCs default to Schedule C taxation: every dollar of business income gets hit with self-employment tax (~15.3%) plus regular income tax. Multi-member LLCs default to partnership taxation, which works similarly. The S-corp election changes both. You become an employee of your own business AND an owner. The IRS lets you pay yourself a "reasonable" salary as the employee, then take the rest as distributions which avoid the SE tax bite.
What it's NOT
An S-corp election is NOT an entity type. You can't form an "S-corporation" the way you form an LLC. It's a tax classification layered on top of an existing entity. The IRS treats your LLC as if it were an S-corp for tax purposes only. State law and operating-agreement law still see you as an LLC.
Deeper read: How the S-Corp Election Actually Works · LLC vs. S-Corp vs. C-Corp: Which Fits?
The tax math (where the savings come from)
The math is mechanical. Below $50K of net business income, an S-corp election usually LOSES money for the owner, payroll service costs + extra return prep exceed the SE tax savings. For many owners the savings begin around $50,000 to $75,000 of profit. Your own number depends on your salary, state and deductions.
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~$1,700
Example: tax difference at $100K profit (single)
after payroll + prep
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~$7,700
Example: tax difference at $200K profit (single)
after overhead
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~$25,200
Example: tax difference at $400K profit (single)
after overhead
Worked examples below assume a single filer taking the standard deduction. Your numbers will differ. Your real break-even comes from a 20-minute Tax Discovery call.
Worked example at $100K net
Single filer, standard deduction, no other income, no spouse income, QBI counted on both paths. Schedule C: $14,130 SE tax + ~$8,235 federal income tax (standard deduction; 20% QBI deduction, limited to 20% of taxable income, so $15,367) = $22,365 total federal. S-corp path with $55K reasonable comp + $45K distribution: $8,415 payroll tax + ~$10,449 federal income tax (standard deduction, 20% QBI deduction on the $40,793 distribution net of the employer payroll tax) = $18,864 total federal. Example: tax difference at $100K profit: ~$3,500. After Gusto (~$1,800/yr) and extra return prep: ~$1,700.
Worked example at $200K net
Same assumptions: single filer, standard deduction, QBI on both paths. Schedule C: $28,234 SE tax + ~$25,196 federal income tax (QBI limited to 20% of taxable income, so $33,957) = $53,431 total. S-corp with $90K comp + $110K distribution: $13,770 payroll tax + ~$30,132 federal income tax (QBI on the $103,115 distribution net of employer payroll tax) = $43,902 total. Example: tax difference at $200K profit: ~$9,529. Net of overhead: ~$7,700.
Worked example at $400K net
Single filer, standard deduction. At this income the Schedule C owner is over the §199A phase-in. Assuming the business is not a specified service business and pays no W-2 wages and holds no depreciable property, the QBI deduction is wage-limited to $0. Schedule C: $33,591 SE tax plus $1,525 Additional Medicare Tax + ~$97,256 federal income tax (no QBI) = $132,371 total. S-corp with $150K comp + $250K distribution, salary set to fit what the market pays for the role (not a target percentage): $22,950 payroll tax + ~$82,421 federal income tax (QBI is 20% of the distribution, $47,705, which is under the cap of 50% of the $150K W-2 wages ($75,000), so the wage limit does not reduce it) = $105,371 total. Example: tax difference at $400K profit: ~$27,000. Net of overhead, the S-corp path stays clearly ahead at this income level; run your real numbers before relying on this figure.
Your numbers will differ. These are simplified. State tax, your specific reasonable comp range, existing retirement contributions, and spouse income all move the number. The Tax Discovery call gives you your real break-even in 20 minutes.
Deeper read: LLC vs. S-Corp: The Tax Math by Income Level · When to Elect: Income Thresholds + Business Types
When to elect (and when not to)
The break-even threshold is the wrong question to start with. The right question is "do I have a stable, operating business that I'll run for 3+ years AND that produces enough net income that the payroll mechanics pay for themselves?" If yes, elect. If no, stay where you are.
Convert if all of these are true
- Net business income $50K–$75K+ (after expenses, before owner comp)
- Operating business: services, retail, contractors, agencies. Not a rental real estate LLC.
- Stable income year over year: S-corp reasonable comp doesn't flex easily, wild swings make payroll planning painful
- You can run real payroll via Gusto, ADP, or similar
- You're committed for 3+ years: S-corp revocation is messy
Don't convert if any of these are true
- Net income under $50K: payroll overhead exceeds the SE tax savings
- Rental real estate LLC: losses, §1031, basis, depreciation all work better outside an S-corp
- Side hustle that may not last: S-corp commits you to running payroll + filing 1120-S annually
- Already an S-corp via Florida/Nevada/Wyoming "anonymity" shell: these usually need cleanup
- You want passive income classification: S-corp distributions are still active for QBI + passive loss rules
Deeper read: When to Elect S-Corp: Income Thresholds, Business Types, and Lifecycle Moments
How to elect (Form 2553 + late relief)
The election itself is one form. Form 2553. One page. The deadline rules are where it gets nuanced.
The 75-day rule
To take effect for the current tax year, Form 2553 must be filed within 75 days of the entity's tax year start. For a calendar-year LLC, that's by March 15. Miss the window and the election moves to the following tax year unless you qualify for late-election relief.
Late-election relief: Rev. Proc. 2013-30
Late relief is available if you ask within 3 years and 75 days of the date you meant the election to start. You must have filed your returns as an S corporation, and you must give a good reason for being late. The IRS often grants relief when the conditions are met and the paperwork is complete. It is not guaranteed. "Properly documented" is doing the heavy lifting in that sentence: most DIY late-election filings fail because the reasonable-cause statement is weak or the operating-as-S-corp attestation is missing.
State-level conformity
Texas is automatic. File your federal Form 2553 and Texas honors it. California follows your federal S election; you then file Form 100S each year. New York needs its own election on Form CT-6. Several other states have their own quirks. Most DIY filings miss the state-level step entirely. Result: you're an S-corp federally but a regular LLC at the state level, and the math breaks.
Deeper read: Form 2553 Step-by-Step · Late S-Corp Election Relief: Rev. Proc. 2013-30 · Mid-Year Election: Effective Date Strategy
Reasonable compensation (the number that makes or breaks the election)
The IRS doesn't tell you what your reasonable comp number is. They tell you what factors they'll use to challenge whatever number you pick. The factors come from a series of court cases: Watson v. Commissioner is the canonical one. They look at: your training and experience, the duties you perform, time devoted to the business, the company's complexity, comparable salaries in your industry, payment history, employment agreements, and how your compensation compares to dividends/distributions.
Three methods that work
- RCReports: paid tool that pulls comp data from BLS, Salary.com, and proprietary surveys, then runs it through a methodology designed to support your number. It costs about $200 a year and builds a report that supports your number. The IRS does not approve any one tool.
- BLS Occupational Employment Statistics: free, but you have to do the research. Look up your specific SOC code (e.g., 11-9111 Medical Services Manager) and pull the local-area median + 75th percentile. Document your methodology.
- Survey-based benchmarking: industry-association surveys, state CPA society reports, etc. Usable but harder to defend than RCReports or BLS.
The number that gets you in trouble
"I'll pay myself $20K and distribute $180K, saves a fortune!" Yeah, until the IRS reclassifies the distributions as wages and you owe back payroll tax + penalties + interest. There is no set percentage. Pay yourself what a business like yours would pay someone else to do your job. Keep notes that show how you picked the number.
Deeper read: How to Set Reasonable Comp Right · IRS Factors + Case Law + Defensible Benchmarks · Documentation: RCReports, BLS, Survey Methods
How to operate an S-corporation
Election is the easy part. Operating one correctly is where most DIYers fail. Five things have to happen on an ongoing basis.
1. Run real payroll (every period)
The IRS expects regular, documented owner comp (not a single December check. Bi-weekly or monthly is standard. Gusto is what we recommend for solo-shareholder S-corps) built for it, handles 2%-shareholder health insurance correctly, files quarterly + annual payroll returns automatically.
2. Track shareholder basis (forever)
Basis = your initial investment + cumulative income - cumulative losses - cumulative distributions. It matters because distributions in excess of basis become capital gains. Suspended losses can't be claimed without sufficient basis. Form 7203 is required in any year you claim a loss, get a distribution that is not a dividend, sell stock, or get a loan repaid by the company. Most DIY S-corp filers don't even know it exists.
3. Set up an accountable plan
Lets you reimburse yourself tax-free for home office, vehicle, phone, and travel expenses. The corporation deducts the reimbursement, you receive it tax-free. Without an accountable plan, those reimbursements are taxable wages.
4. Maintain single-class-of-stock compliance
S-corps can have only one class of stock. S-corp owners must have the same rights to profits and sale proceeds. If the paperwork gives one owner more, the election can end. A draw that is uneven once should still be fixed right away, usually with a catch-up payment. The IRS calls an unfixed pattern a "disproportionate distribution", single biggest accidental S-corp termination cause.
5. Handle 2%-shareholder health insurance correctly
Health insurance premiums for >2% shareholders add back to W-2 Box 1, then deduct above-the-line on the 1040 via §162(l). Done wrong, you lose the deduction OR trigger payroll-tax adjustments. Gusto handles this correctly if you flag the shareholder status.
Deeper read: Owner W-2 Setup: Gusto Walkthrough · Distributions, Draws, and Salary · Shareholder Basis Tracking · Accountable Plan: Tax-Free Reimbursements · Health Insurance for >2% Shareholders
Retirement stacking (the secondary tax shelter)
A Solo 401(k) works for sole proprietors and S-corp owners. On an S-corp, the Solo 401(k) lets you stack $24,500 in employee deferrals plus 25% of W-2 wages in employer profit-sharing: up to $72,000 combined in 2026. Your S-corp salary sets the 25% employer amount, so a lower salary means a lower amount; you need about $190,000 of salary to reach the $72,000 limit. A Schedule C owner can also use a Solo 401(k), with the same $24,500 employee deferral plus about 20% of net earnings as the employer share.
Layer a cash balance plan on top
A cash balance plan can allow a larger deduction for older owners with steady income. It must be funded every year, and it needs an actuary. The math depends on age + comp; the planning is worth running every year if your taxable income is above $400K.
Deeper read: S-Corp + Solo 401(k) Stacking · Solo 401(k) vs SEP-IRA
Common mistakes (from our cleanup engagements)
- Reasonable comp set too low. We've seen $40K+ adjustments on single-year audits when the IRS reclassifies distributions as wages.
- No actual payroll running. Owner takes "draws" all year, calls them distributions at year-end. The IRS calls them wages.
- Distributions in excess of basis. Three years later the K-1 shows a $50K+ surprise capital gain.
- Form 7203 missing. Mandatory since 2021. Most DIY filers don't know it exists.
- Late S-elections filed wrong. Missing the reasonable-cause statement or the operating-as-S-corp attestation. IRS denies, and you're stuck filing as the wrong entity for years.
- Missing state conformity election. Federal S-corp but state regular LLC = the math breaks.
- Disproportionate distributions on a multi-owner S-corp. Voids the election. You owe corporate tax on prior years.
How we handle S-corp work at ETS
Our standard S-corp engagement covers the full lifecycle: diagnostic (does it even make sense?), election filing (Form 2553 + state conformity), implementation (payroll, accountable plan, basis init), and ongoing compliance (annual 1120-S + 1040, quarterly check-ins, reasonable comp review). We don't do partial S-corp work: every preparer who does Form 2553 in March and then doesn't help with payroll setup is the reason most DIY S-corps go sideways.
Tax Analysis is $2,595 (credits to engagement). Comprehensive tier with full conversion + Year 1 is $8,000–$15,000 depending on complexity. Annual retainer Year 2+ is $6,000–$12,000. Same pricing on the website as on the call.