S Corp vs LLC at $100,000 Profit: Worked Example
For a single owner with $100,000 of 2026 profit and a $50,000 salary, our calculator estimates an S corp would cost $19,300 in federal taxes and extra costs versus $22,365 as a single-member LLC, a $3,065 saving. With a $60,000 salary the saving drops to $1,229, and at $70,000 it turns negative.
"$100,000 of profit" is where the S corp question usually gets serious. This post runs one example all the way through, line by line, using the same code as our S-Corp Savings Calculator. Every input is stated, so you can swap in your own.
What are the example's inputs?
| Input | Value | Why |
|---|---|---|
| Tax year | 2026 | Current rates and thresholds |
| Filing status | Single | Simplest case |
| Net business profit (before owner salary) | $100,000 | The question in the title |
| Owner's salary in the S corp | $50,000 (50% of profit) | Middle of RAHA's 35–60% starting heuristic, not an IRS figure |
| Other income | None | Isolates the business |
| Payroll service | $600 a year | Example input, not a RAHA price. Use your own quote |
| Extra accounting / Form 1120-S | $1,000 a year | Example input, not a RAHA price. Use your own quote |
| Extra state entity-level tax | $0 | The calculator's default. We assume no extra state tax from the election, so the result is federal plus payroll only |
| State unemployment tax (SUTA) | $0 in the main example | Isolates the federal effect. We add a real state rate below |
| Specified service business (SSTB)? | No | Only matters for QBI at higher incomes |
"LLC" here means a single-member LLC taxed the default way, as a sole proprietorship on Schedule C. "S corp" means the same LLC after filing Form 2553.
What does the LLC owner pay as a sole proprietor?
| Line | Amount |
|---|---|
| Net earnings from self-employment ($100,000 × 92.35%) | $92,350 |
| Self-employment tax (15.3% of $92,350) | $14,130 |
| Deduction for half of SE tax | $7,065 |
| Adjusted gross income | $92,935 |
| Standard deduction (2026, single) | $16,100 |
| QBI deduction (capped at 20% of taxable income before QBI) | $15,367 |
| Federal income tax | $8,235 |
| Total federal tax | $22,365 |
The key line is SE tax: 15.3% on almost all of the profit, because the entire $100,000 is self-employment income.
What does the S corp owner pay?
| Line | Amount |
|---|---|
| Salary | $50,000 |
| Employee Social Security + Medicare (7.65%) | $3,825 |
| Employer Social Security + Medicare (7.65%) | $3,825 |
| FUTA (0.6% of the first $7,000) | $42 |
| SUTA | $0 (excluded here) |
| Payroll service + extra accounting | $1,600 |
| K-1 profit ($100,000 − $50,000 − $3,867 employer taxes − $1,600 costs) | $44,533 |
| QBI deduction (20% of K-1 profit; salary is not QBI) | $8,907 |
| Federal income tax (salary + K-1) | $10,008 |
| Total: income tax + both halves of payroll tax + FUTA + costs | $19,300 |
Net saving: $22,365 − $19,300 = $3,065 a year.
Where exactly does the $3,065 come from?
It helps to split the difference into its three moving parts:
| Component | Effect |
|---|---|
| Social Security + Medicare + FUTA: $14,130 SE tax vs $7,692 payroll taxes | $6,438 lower |
| Federal income tax: $8,235 vs $10,008 | $1,773 higher |
| Payroll service + accounting | $1,600 higher |
| Net | $3,065 lower |
Income tax goes up with the S corp, for two reasons. First, you lose the deduction for half of SE tax, because there's no SE tax. Second, the QBI deduction shrinks from $15,367 to $8,907, because your salary is wages, not qualified business income. An estimate that looks only at payroll taxes misses this and overstates the saving.
What happens with a different salary?
Salary is the biggest lever. Same inputs, different salaries:
| Salary | S corp total | Net saving | Calculator's verdict |
|---|---|---|---|
| $35,000 | $16,547 | $5,818 | Could save |
| $40,000 | $17,464 | $4,900 | Could save |
| $50,000 | $19,300 | $3,065 | Could save |
| $60,000 | $21,135 | $1,229 | Probably not worth it yet |
| $70,000 | $22,971 | −$606 | Not worth it |
"Probably not worth it yet" means a positive saving under $1,500, which is RAHA's threshold for when the extra work isn't likely to pay off. The low-salary rows look attractive, but the salary has to be reasonable for the work you do. The IRS sets no percentage. See How Much Salary Should an S Corp Owner Pay Themselves?.
What if payroll and accounting cost more?
The $1,600 of example costs is an input, not a fact. At a $50,000 salary:
| Payroll + accounting costs | Net saving |
|---|---|
| $0 (do-it-yourself, not recommended) | $4,383 |
| $1,600 ($600 payroll + $1,000 accounting) | $3,065 |
| $3,000 ($1,200 payroll + $1,800 accounting) | $1,911 |
Because these costs are deductible, each extra dollar of cost reduces the saving by a bit less than a dollar. Get real quotes before deciding.
How does a real state's unemployment tax change it?
Every state charges employers SUTA. To show the effect, we re-ran the $50,000-salary case with Wisconsin's verified 2026 figures: a new-employer rate of 3.05% (non-construction, payroll under $500,000) on the first $14,000 of wages, per the Wisconsin Department of Workforce Development. Wisconsin generally doesn't tax a typical small S corp at the entity level (2025 Form 5S instructions). (If you select Wisconsin in the calculator, it prefills the lowest new-employer rate in the state's range, 2.50%, which applies to construction employers. Replace it with the rate on your own notice.)
| Main example | With Wisconsin SUTA | |
|---|---|---|
| SUTA | $0 | $427 |
| S corp total | $19,300 | $19,652 |
| Net saving | $3,065 | $2,713 |
The calculator excludes state personal income tax, which applies in Wisconsin and most states, so this is a federal-plus-payroll comparison. Where an S corp would owe an extra state entity-level tax, the saving falls further. The calculator shows your state's rule with its source and lets you enter that extra amount.
What's the takeaway at $100,000?
- With a salary around half of profit and modest costs, an S corp may save a few thousand dollars a year.
- The saving is fragile. A higher salary, higher costs or state taxes can cut it below $1,500 or erase it.
- The break-even profit for this setup (salary at 50%) was $25,000. That's where the saving first turns positive, not where it becomes worth the effort. The saving crossed $1,500 at about $53,000 of profit.
If the numbers work for you, the deadline to elect for 2027 as a calendar-year business is March 15, 2027. See Form 2553 Deadline: How and When to Elect S Corp Status and the full S corp election guide.
Frequently asked questions
Is an S corp worth it at $100,000 profit?
It may be. In our example the saving ranged from $5,818 to −$606 depending on salary. The answer depends on the salary you can justify, your state and your real costs.
Why is my income tax higher as an S corp?
You lose the deduction for half of SE tax, and your QBI deduction shrinks because salary isn't qualified business income. The payroll tax saving usually outweighs this, but not always.
Does this example include state income tax?
No. It includes Wisconsin's SUTA in one variation, but not state personal income tax. Most states tax S corp pass-through income on your personal return.
What if I'm married filing jointly?
The payroll tax math is the same, but income tax brackets and QBI thresholds differ. Run the calculator with your filing status and household income.
Does RAHA offer S corp setup?
Yes. Our S-Corp Setup + Payroll + Bookkeeping package covers Form 2553 review and filing, a reasonable-salary analysis, payroll setup and runs, and monthly bookkeeping with the year-end 1120-S, at a fixed price quoted upfront. See payroll processing or book a consultation.
Sources
- IRC §1401 (SE tax rates): https://www.law.cornell.edu/uscode/text/26/1401
- IRC §1402 (net earnings from self-employment): https://www.law.cornell.edu/uscode/text/26/1402
- IRS, Publication 15 (2026): https://www.irs.gov/pub/irs-pdf/p15.pdf
- IRS, Rev. Proc. 2025-32 (2026 inflation adjustments): https://www.irs.gov/pub/irs-drop/rp-25-32.pdf
- IRC §199A (QBI deduction): https://www.law.cornell.edu/uscode/text/26/199A
- SSA, contribution and benefit base: https://www.ssa.gov/oact/cola/cbb.html
- Wisconsin DWD, unemployment tax rates: https://dwd.wisconsin.gov/ui/employers/taxrates.htm
- Wisconsin DOR, 2025 Form 5S instructions: https://www.revenue.wi.gov/TaxForms2025/2025-Form5S-Inst.pdf
- IRS, S corporation compensation and medical insurance issues: https://www.irs.gov/businesses/small-businesses-self-employed/s-corporation-compensation-and-medical-insurance-issues
This guide provides general information for educational purposes and is not tax, legal or accounting advice. Consult a qualified professional before acting.
