Service boundary: Education and tax-classification analysis only. Monaco CPA does not form or convert entities, provide legal advice, obtain EINs, file DBAs, act as registered agent, open bank accounts, or set up/transmit payroll.
In This Article
- Quick Overview of the Three Structures
- The Math at Four Income Levels
- At $50,000 Net Profit
- At $100,000 Net Profit
- At $150,000 Net Profit
- At $250,000 Net Profit
- Beyond the Tax Math
- Summary Table
- Next Steps
- Legal Framework and Election Details
- Frequently Asked Questions
- Ready to File With Confidence?
I wrote a two-way comparison of LLC vs. S-Corp that covers the basics. This post adds sole proprietorships and shows the federal payroll-tax mechanics at four profit levels. The examples are not universal breakpoints or complete return projections.
Quick Overview of the Three Structures
Sole Proprietorship: The default. Business income is reported on Schedule C. For an ordinary nonfarm business, Schedule C profit generally is multiplied by 92.35% to determine Schedule SE line 4c net earnings; Social Security then applies within the remaining combined wage base and Medicare has no comparable cap.
LLC (Single-Member): An already-formed single-member LLC is generally disregarded for federal income-tax purposes unless an election changes its classification, so business activity may remain on Schedule C. Formation, liability, fees, and asset protection require current agency information and qualified legal advice; Monaco CPA does not form entities.
S-Corp tax election for an existing eligible entity: Form 2553 may change federal payroll-tax mechanics, requiring supportable W-2 compensation and separate federal/NJ compliance. The client or payroll provider operates payroll. Monaco CPA may analyze an election after the entity exists but does not form or convert entities or promise a lower tax result.
The Math at Four Income Levels
These calculations use 2026 payroll-tax rates and assume a single filer with no other wages. They isolate Schedule SE versus combined employer-and-employee FICA and do not purport to compute income tax, QBI, NJ tax, benefits, or net savings.
At $50,000 Net Profit
Sole Prop / LLC (default):
- Schedule SE line 4c: $50,000 x 92.35% = $46,175
- Regular SE tax: $46,175 x 15.3% = $7,064.78
S-Corp (hypothetical $40,000 salary assumption; not a reasonable-compensation conclusion):
- Payroll tax (employer + employee FICA on $40K salary): ~$6,120
- Employer FICA deduction: $40,000 x 7.65% = $3,060
- Residual S-Corp profit before other expenses: $50,000 - $40,000 - $3,060 = $6,940
- Gross payroll-tax difference: $7,064.78 - $6,120 = $944.78
Interpretation: $944.78 is not net savings. Payroll, separate returns, NJ minimum CBT and payroll taxes, federal and NJ income tax, QBI, and actual reasonable compensation still must be included.
At $100,000 Net Profit
Sole Prop / LLC (default):
- Schedule SE line 4c: $100,000 x 92.35% = $92,350
- Regular SE tax: $92,350 x 15.3% = $14,129.55
S-Corp (hypothetical $60,000 salary assumption; not a reasonable-compensation conclusion):
- Payroll tax on $60K salary: ~$9,180
- Employer FICA deduction: $60,000 x 7.65% = $4,590
- Residual S-Corp profit before other expenses: $100,000 - $60,000 - $4,590 = $35,410
- Gross payroll-tax difference: $14,129.55 - $9,180 = $4,949.55
Interpretation: Even after subtracting an assumed compliance cost, the remainder is not net tax savings because income-tax deductions, QBI, NJ taxes, other wages, and return-specific items differ.
At $150,000 Net Profit
Sole Prop / LLC (default):
- Schedule SE line 4c: $150,000 x 92.35% = $138,525
- Regular SE tax: $138,525 x 15.3% = $21,194.33
S-Corp (hypothetical $75,000 salary assumption; not a reasonable-compensation conclusion):
- Payroll tax on $75K salary: ~$11,475
- Employer FICA deduction: $75,000 x 7.65% = $5,737.50
- Residual S-Corp profit before other expenses: $150,000 - $75,000 - $5,737.50 = $69,262.50
- Gross payroll-tax difference: $21,194.33 - $11,475 = $9,719.33
Interpretation: The full result depends on QBI, reasonable salary, other wages, NJ BAIT eligibility, retirement contributions, income tax, payroll taxes, and compliance costs.
At $250,000 Net Profit
Sole Prop / LLC (default):
- Schedule SE line 4c: $250,000 x 92.35% = $230,875
- Social Security: $184,500 x 12.4% = $22,878; regular Medicare: $230,875 x 2.9% = $6,695.38
- Regular SE tax: $29,573.38; assuming no other wages, Form 8959 Additional Medicare Tax is ($230,875 - $200,000) x 0.9% = $277.88
S-Corp (hypothetical $100,000 salary assumption; not a reasonable-compensation conclusion):
- Payroll tax on $100K salary: ~$15,300
- Employer FICA deduction: $100,000 x 7.65% = $7,650
- Residual S-Corp profit before other expenses: $250,000 - $100,000 - $7,650 = $142,350
- Gross payroll-tax difference including the stated sole-proprietor Additional Medicare amount: $29,573.38 + $277.88 - $15,300 = $14,551.25
Interpretation: This is still a gross payroll-tax comparison, not net savings. Salary, QBI, income tax, BAIT, NJ taxes, other wages, benefits, and compliance costs must be modeled.
Beyond the Tax Math
Liability Protection
Liability, governance, and asset-protection consequences are state-law questions that depend on formation, operation, contracts, insurance, and facts. Monaco CPA does not provide legal or formation advice; obtain independent counsel rather than selecting an entity from a tax article.
Formation Process
NJ LLC formation: Formation, EIN, registered-agent, DBA, and bank-account steps are outside Monaco CPA scope and require current official guidance and independent counsel. Any tax-classification work starts after the legal entity exists under a written scope.
S-Corp election education: For an entity already formed by the client, federal Form 2553 timing and any late-election relief are fact-specific. The statute applies to privilege periods beginning after December 22, 2022; for calendar-year taxpayers, that means January 1, 2023. NJ procedural FAQ/TB-105 also describe the rule as on or after December 22, 2022; unusual short periods beginning Dec. 22 need Division confirmation. DORES registration, federal approval proof, shareholder consent, timely return history, and earlier-period relief remain separate compliance records. The client or payroll provider handles payroll setup and transmission.
NJ-Specific Costs and Considerations
- NJ LLC annual report: $75/year.
- NJ minimum CBT: Tiered by NJ gross receipts: $375 (under $100K), $562.50 statutory tier (reported as $562 on the current whole-dollar CBT-100S instructions) for the next tier, then $750, $1,125, and $1,500 - not a flat $500. Apply the current return instructions to the actual NJ gross-receipts tier.
- NJ BAIT election: Available to eligible pass-through entities, not sole proprietorships. Rates apply to statutory distributive proceeds; the net federal/NJ benefit depends on owner allocation, deduction choice, brackets, QBI, credits, timing, and costs.
- NJ payroll taxes: S-Corp owner-employees pay into NJ SUI, SDI, FLI, and workforce development. These are additional costs beyond federal FICA.
When to Convert
Sole prop to LLC: Evaluate liability exposure, insurance, contracts, governance, and state costs with legal advice. A single-member LLC generally retains the default Schedule C tax treatment, but it is not automatically right for every owner.
LLC to S-Corp: Run a complete model using defensible reasonable compensation and the owner's full return. No $80,000 or $100,000 profit threshold decides the election.
S-Corp back to LLC (default): Rare, but it happens. If your income drops significantly and stays low, the compliance costs of S-Corp may no longer be justified. Revoking an S-Corp election requires consent from shareholders holding more than 50% of shares.
Summary Table
| Profit / Assumed Salary | Sole-Prop SE Tax | S-Corp Combined FICA | Gross Payroll-Tax Difference |
|---|---|---|---|
| $50K / $40K | $7,064.78 | $6,120 | $944.78 |
| $100K / $60K | $14,129.55 | $9,180 | $4,949.55 |
| $150K / $75K | $21,194.33 | $11,475 | $9,719.33 |
| $250K / $100K | $29,851.25 including stated Additional Medicare | $15,300 | $14,551.25 |
Each difference is before income tax, QBI, NJ taxes, reasonable-compensation validation, benefits, and compliance costs and therefore is not net savings.
Next Steps
Run your own numbers with the S-Corp Calculator. For educational formation information, read the New Jersey's official business portal and independent legal counsel. Monaco CPA does not form entities or provide legal services. For the two-way tax comparison, read the LLC vs. S-Corp comparison.
Legal Framework and Election Details
Under Treas. Reg. Section 301.7701-3, a single-member LLC is a disregarded entity by default and generally files on Schedule C; multi-member LLCs default to partnership taxation. A calendar-year Form 2553 generally is due by the 15th day of the third month (March 16 for 2026 because March 15 was Sunday). Rev. Proc. 2013-30 provides late-election relief when all requirements are met.
The statute applies to privilege periods beginning after December 22, 2022; for calendar-year taxpayers, that means January 1, 2023. NJ procedural FAQ/TB-105 also describe the rule as on or after December 22, 2022; unusual short periods beginning Dec. 22 need Division confirmation. For qualifying periods, P.L. 2022, c.133 recognizes a valid federal S election unless the entity opts out; the separate CBT-2553 is historical for those periods. DORES registration as an 1120 filer, federal approval proof, Shareholder Jurisdictional Consent, and timely CBT-100S filing remain separate compliance steps. Formation date is not the test; earlier privilege periods may require CBT-2553-R retroactive-relief review. The NJ S-Corp still files CBT-100S and owes the applicable minimum tax (from $375 for the lowest gross-receipts tier to $1,500 for the highest ordinary tier). Current CBT-100S instructions expressly state that the minimum tax cannot be prorated, including for a short period.
The NJ Certificate of Formation fee for an LLC is $100 (per the Division of Revenue fee schedule updated July 2026), and the federal EIN has no filing fee. Professional and payroll costs vary by provider, scope, and facts; obtain written quotes and compare them with a complete tax model before electing S-Corp status.
This article is for informational purposes only and does not constitute tax advice. Tax outcomes depend on your specific facts and circumstances.
Frequently Asked Questions
Can I switch from sole proprietor to LLC to S-Corp over time, or do I have to pick one from the start?
A business can change legal or tax classification over time, but each transition has legal, tax, payroll, basis, and timing consequences. Monaco CPA does not recommend or implement formation; independent counsel should address liability and governance, and any S election requires a complete tax model.
Does forming an LLC change how I file my taxes?
A single-member LLC is a disregarded entity for federal tax purposes, meaning you still file Schedule C on your personal return exactly like a sole proprietor. The LLC provides legal liability protection but does not change your tax filing by itself. The tax treatment only changes if you affirmatively elect S-Corp status by filing Form 2553 with the IRS.
What happens if I elect S-Corp but my income drops below the breakeven point?
You will still owe the ongoing compliance costs: payroll processing, the S-Corp tax return (Form 1120-S), and the NJ $375 S-Corp minimum tax. If income changes, fixed costs can materially change the full-return comparison. Revocation eligibility, consent, timing, legal effects, and state treatment require fact-specific review; this article does not recommend a revocation.
More NJ Tax Comparisons: LLC vs S-Corp NJ | NJ BAIT vs SALT Cap | W-2 vs 1099 NJ | View All Comparisons
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Tax rules change frequently. Use the contact form to request a written scope; submitting it does not promise a call, engagement, or outcome. Greg Monaco is a NJ-licensed CPA and the firm's sole practitioner.
