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: The displayed $4,949.55 does not subtract compliance costs and is not net tax savings; income-tax deductions, QBI, NJ taxes, other wages, and return-specific items still 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 (totals computed from unrounded amounts: $29,573.375 + $277.875 = $29,851.25)
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. Those tiers are the standalone, non-QSSS schedule: a taxpayer that is a member of an affiliated group under IRC 1504 or a controlled group under IRC 1563 whose total group-wide payroll is $5,000,000 or more owes a $2,000 minimum regardless of gross receipts (N.J.S.A. 54:10A-5(e)), and a QSSS is consolidated onto its parent's CBT-100S via Schedule Q with its own minimum still remitted with the parent's payment. 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: Covered S-corporation owner-employee wages can trigger NJ unemployment, temporary-disability, family-leave, workforce-development, withholding, and related employer obligations under their separate wage bases, rates, coverage, and exception rules. These costs are separate from 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.
Changing an S election: A change in income or costs can alter the complete-return comparison, but it does not by itself decide whether revocation is appropriate. Revoking the Section 1362 election (with consent of shareholders holding more than 50% of shares) ordinarily leaves the entity taxed as a C corporation filing Form 1120 - it does not restore an LLC's default sole-proprietor or partnership classification. Returning to another classification can require a separate eligible Form 8832 election, is subject to the 60-month rule, and can have deemed-transaction consequences. Analyze eligibility, consent, timing, classification, and tax effects before any change.
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
The S-Corp Calculator shows limited payroll-tax arithmetic and makes no election recommendation. Formation and legal-classification questions belong with New Jersey's official business resources and independent counsel; Monaco CPA does not form entities or provide legal services. The LLC vs. S-Corp comparison explains additional tax-classification mechanics.
Legal Framework and Election Details
Under Treas. Reg. Section 301.7701-3, a domestic single-member LLC is disregarded by default, so its owner reports the activity on the return and schedule applicable to that activity (often Schedule C for an active trade or business); a domestic multi-member LLC defaults to partnership classification unless an exception or election applies. 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 NJ gross-receipts tier to $1,500 for the highest ordinary tier on the standalone, non-QSSS schedule, or $2,000 for a member of an affiliated group under IRC 1504 or a controlled group under IRC 1563 with $5,000,000 or more of total group-wide payroll; a QSSS is consolidated onto its parent's CBT-100S via Schedule Q with its own minimum still remitted with the parent's payment). 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 domestic single-member LLC is disregarded for federal income-tax purposes by default, so an owner carrying on a trade or business generally reports the activity on Schedule C unless a valid classification election applies. Any state-law liability effect depends on formation, capitalization, separateness, contracts, conduct, insurance, and governing law and requires legal advice. Federal tax classification can change through a valid entity-classification or S-Corporation election when the eligibility, filing, and effective-date requirements are met.
What happens if income changes after an S-Corp election?
You will still owe the ongoing compliance costs: payroll processing, the S-Corp tax return (Form 1120-S), and the NJ S-Corp minimum tax (starting at $375 on the standalone, non-QSSS tiered schedule, or $2,000 for a member of an affiliated group under IRC 1504 or a controlled group under IRC 1563 with $5,000,000 or more of total group-wide payroll). 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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