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Should your LLC elect S-corp? How to run the numbers with an AI CFO agent
Someone told you you're leaving money on the table by not being an S-corp. Maybe they're right. Maybe the extra payroll, paperwork and fees eat most of the savings. The only way to know is to run your own numbers and bring them to your CPA before the election deadline, not after.
This guide covers where S-corp savings come from, what "reasonable compensation" means, when the election is due for 2027, and a simple model you can build in an afternoon. It follows the workflow built into Vibewright's Fractional CFO · Entity Structuring builds, which release on Thursday, October 29, 2026 at 10:00 AM ET.
Where the savings come from
As a sole proprietor or single-member LLC taxed by default, your net profit goes on Schedule C and is subject to self-employment tax. The IRS's self-employment tax page puts the rate at 15.3%: 12.4% for Social Security (up to the year's wage base) and 2.9% for Medicare, with an additional 0.9% Medicare tax above certain income thresholds.
An LLC that elects S-corp treatment pays you a salary through payroll, and payroll taxes apply to that salary. Profit left over can come out as distributions, which aren't subject to employment taxes. That gap is the whole idea. It only works if the salary is real.
Reasonable compensation is the catch
The IRS's page on S corporation compensation says an S-corp must pay reasonable compensation to a shareholder-employee for their services before taking non-wage distributions, and that the IRS can reclassify distributions as wages. Factors it lists include your training and experience, duties, time spent, what comparable businesses pay for similar services, and payments to non-shareholder employees.
In practice: if your profit comes from your own work, most of it may need to be salary. A salary set low just to boost savings is a known audit risk. The Entity Structuring builds label it Audit-sensitive every time.
The election deadline for 2027
Per the IRS Instructions for Form 2553, you file the election either at any time during the tax year before it takes effect, or no more than 2 months and 15 days after the start of the tax year it applies to. For an existing calendar-year business that wants S status starting January 1, 2027, that means filing any time in 2026 or by Monday, March 15, 2027. Every shareholder must consent, and the IRS generally responds within 60 days. Relief for late elections exists under Rev. Proc. 2013-30, but it has conditions. Don't plan on it.
Eligibility rules apply too: no more than 100 shareholders, only certain kinds of shareholders, no nonresident alien shareholders, and one class of stock.
Run the numbers, step by step
- Start with real profit. Use last year's net profit and a realistic projection for next year from your books, not a guess.
- Set a reasonable salary range. Look up what it would cost to hire someone to do your job. Write down the sources. Model a low, mid and high salary.
- Compare employment taxes. Self-employment tax on Schedule C profit versus payroll tax on each salary level.
- Subtract the added costs. A payroll service, a separate business return (Form 1120-S), state fees or taxes, and more admin time. Get real quotes.
- Flag what the table can't see. The S-corp salary changes the qualified business income (QBI) deduction and retirement contribution limits, and your state may treat S-corps differently. Those go to your CPA to model.
- Bring a packet, not a hunch. Your numbers, your salary rationale, the deadline, and a short list of questions ranked by dollar impact.
Here's how the Entity Structuring build lays out that comparison, using the example from its own instructions (a single-member LLC netting about $120,000, with a $60,000 salary assumed):
| Item | LLC (Schedule C) | S-corp |
|---|
| Earnings subject to SE or payroll tax | $110,820 (92.35% of $120,000) | $60,000 salary |
| SE or payroll tax at 15.3% | about $16,955 | about $9,180 |
| Gross savings | | about $7,775 |
| Added costs (payroll, separate return, state fees) | | about $2,000 to $4,000 |
| Estimated net savings | | about $3,800 to $5,800 |
Those are example numbers, not a promise, and they leave out income-tax effects. Your salary, costs and state change the answer. The point is the shape: every input labeled, every cost counted, and the one assumption that would flip the decision named.
How the Entity Structuring builds help
The Entity Structuring emphasis spends most of its attention on choosing, comparing and maintaining business structures (sole prop, LLC, S-corp election, C-corp, multi-owner) and how owners get paid. Every answer ends with a Structure check: does this decision fit your current entity, and does it change which entity is best? Its workflows include:
- An entity fit assessment that scores each structure on tax cost, liability protection, admin burden and funding fit.
- The S-corp election analysis above, at low, mid and high salaries, with a break-even profit level.
- An owner pay plan: draws, guaranteed payments, salary plus distributions or dividends, scheduled around cash flow and your tax reserve.
- A C-corp readiness check for founders talking to investors.
- An entity maintenance checklist: separate accounts, annual state reports, registered agent, payroll filings, and minutes or consents where required.
- A step-by-step timeline for any change, showing who does each step (you, your CPA, your attorney).
It doesn't file elections, draft formation documents or give legal opinions. Final tax elections go to a CPA and legal documents go to an attorney. It gives educational information, not tax or legal advice, and it tells you to verify current rules on IRS.gov.
How to run it
Paste an Entity Structuring build into your AI tool's standing instructions and say "run onboarding." Have last year's return (with SSNs removed), your current P&L and any payroll quotes handy. Setup walkthroughs: Claude Projects and ChatGPT Projects. Choosing a tool? See Claude Project vs ChatGPT Project vs Gemini Gem. Want clean books first? Start with the CPA-ready P&L monthly close checklist, and use the year-end tax planning checklist to put the decision on your calendar.
Then pick the voice you'll actually listen to: Aggressive, Affirming, Dry, Funny or Sarcastic. Same math, five ways to hear it. See the five tones compared.
Get the Entity Structuring builds
All five CFO · Entity Structuring tones release on Thursday, October 29, 2026 at 10:00 AM ET. They are not downloadable before then.
- Free sample: claim the CFO · Tax Planner · Funny build with your email to try a Vibewright CFO first. It is delivered on 10/26. License: Personal and commercial use allowed. No redistribution.
- Pick your tone: single build $9, role pack $49, launch bundle $79, All-Access $19/mo or $149/yr, or Founding Member $199 lifetime for the first 100. 7-day refund on subscriptions. No refunds on downloads.
Choose your Entity Structuring tone on /pricing · Or grab the free Tax Planner sample