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): A state-level structure that provides liability protection. You file formation documents with NJ ($100 filing fee) and pay an annual report fee ($75). For tax purposes, a single-member LLC is identical to a sole proprietorship. Same Schedule C, same SE tax. The LLC adds legal protection, not tax savings.
S-Corp (LLC with S-Corp Election): You form an LLC in NJ, then file IRS Form 2553 to elect S-Corp taxation. This lets you split income between a W-2 salary (subject to payroll taxes) and distributions (not subject to payroll taxes). The trade-off is higher compliance costs: payroll processing, a separate S-Corp tax return (Form 1120-S and NJ CBT-100S), and NJ's $375 S-Corp minimum tax (75% of the $500 C-Corp minimum).
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 (assumed $40,000 reasonable salary):
- 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 (assumed $60,000 reasonable salary):
- 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 (assumed $75,000 reasonable salary):
- 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 (assumed $100,000 reasonable salary):
- 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
A sole proprietorship offers zero liability protection. Your personal assets (house, savings, car) are exposed to business debts and lawsuits. Both LLCs and S-Corps provide a liability shield between your business and personal assets. For any business with real risk, operating as a sole prop is hard to justify even at low income levels.
Formation Process
NJ LLC: File a Certificate of Formation with the NJ Division of Revenue ($100). Get an EIN from the IRS (free, takes 5 minutes online). Open a business bank account. Total time: a few days.
S-Corp Election: Form the LLC first, then file IRS Form 2553 within 2 months and 15 days of the start of your tax year (the 15th day of the 3rd month - e.g., March 15 for a calendar-year filer). Late-election relief under Rev. Proc. 2013-30 allows filings within 3 years and 75 days of the intended effective date if reasonable-cause requirements are met. Set up payroll. File the NJ CBT-100S to ensure NJ recognizes the election.
NJ-Specific Costs and Considerations
- NJ LLC annual report: $75/year.
- NJ minimum CBT: Tiered by NJ gross receipts: $375 (under $100K), $562.50 ($100K-$250K), $750 ($250K-$500K), $1,125 ($500K-$1M), $1,500 ($1M+) - NOT a flat $500. The $375 minimum applies to most S-Corps under $100K gross receipts.
- 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 Savings Calculator. If you're ready to form an LLC or elect S-Corp status, check out my business formation services. And for the two-way deep dive on LLC vs. S-Corp specifically, 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.
New Jersey automatically recognizes a federal S-Corp election under P.L. 2022, c.133, so you no longer need to file a separate NJ election form. However, the NJ S-Corp still files a CBT-100S return and pays the $375 S-Corp minimum tax (for gross receipts under $100K; scales to $1,500 for $1M+). If you formed your LLC and elected S-Corp status mid-year, NJ prorates the minimum tax based on the number of months the entity existed during the tax year.
For entity conversion costs, expect to pay roughly $100 for the NJ Certificate of Formation (LLC), $0 for the federal EIN, and $1,500 to $3,000 in professional fees for the S-Corp election, initial payroll setup, and first-year compliance. Annual ongoing costs for an S-Corp typically run $2,000 to $5,000 depending on payroll frequency and the complexity of your return. These costs should be weighed against the payroll tax savings shown in the tables above.
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?
Yes, a business can change legal and tax structure over time, but each transition has legal, tax, payroll, basis, and timing consequences. Form an LLC based on liability and governance needs; evaluate S-Corp taxation through a complete model rather than a fixed profit threshold.
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 your income drops significantly and stays low, those fixed costs may exceed the SE tax savings. You can revoke the S-Corp election with consent from shareholders holding more than 50% of shares, but the revocation is generally not effective until the following tax year.
More NJ Tax Comparisons: LLC vs S-Corp NJ | NJ BAIT vs SALT Cap | W-2 vs 1099 NJ | CPA vs TurboTax NJ | View All Comparisons
Related reading: NJ Tax Calendar | Services | About Greg Monaco | Contact
Ready to File With Confidence?
Tax rules change frequently. If anything in this guide applies to your situation, a quick review with a CPA can prevent costly mistakes. Greg Monaco is a NJ-licensed CPA (License #20CC04711400). Greg remains responsible for every engagement and reviews, approves, and signs all client-facing work. Trained staff may assist under his direct supervision and confidentiality procedures.