Entity Setup
Structuring Entities Post-OBBBA: What Businesses Should Know When Forming a C-Corp vs S-Corp or LLC
Understand how the One, Big, Beautiful Bill’s key changes affect entity selection, tax elections and operational risk — so you can choose the best structure for your venture.
By NomadicTax Research Team • 5-8 min read • August 17, 2026
## Key Changes Under OBBBA Affecting Entity Setup
The One, Big, Beautiful Bill brought sweeping changes, especially for **tax rates, deduction limits, and definitions** relevant to businesses. Here are some entity-structure considerations you must evaluate:
| Feature | C-Corporation (C-Corp) | S-Corporation (S-Corp) / LLC taxed as pass-through |
|---|---|---|
| **Tax rate environment** | Flat about 21%; shields owners from individual tax rates, which now can go up to **37%** or more for high income under revised brackets. ([irs.gov](https://www.irs.gov/newsroom/irs-releases-tax-inflation-adjustments-for-tax-year-2026-including-amendments-from-the-one-big-beautiful-bill?utm_source=openai)) | Income flows through to individuals who are taxed at steep individual brackets. Distributions to owners are not taxed at corporate level but may be subject to self-employment taxes if LLC member.
| **Qualified business income (QBI) deduction** | Not applicable; earnings are taxed at corporate level. | Still potentially eligible for up to 20% deduction subject to limitations on income, wages, and capital investment (but OBBBA has created some adjustments in thresholds) – important to model.
| **Flexibility of ownership** | More rigid, especially regarding stock structure and investors’ expectations. | LLCs offer flexibility but can trigger self‐employment tax and complicate state filings.
## What to Consider Before Choosing
- **Future investment & exit:** C-Corps are often preferred in startup capital raises. Also, OBBBA’s changes to capital gains treatment, opportunity zone rules (as per IRS Notice 2026-40) affect C-Corp investments. ([irs.gov](https://www.irs.gov/irb/2026-28_irb?utm_source=openai))
- **Income timing & distribution:** S-Corps allow precise salary vs dividend splits; LLCs may have less structure, but self-employment tax exposure is higher. Under OBBBA, penalties for excess executive compensation (for certain non-profits) have also been expanded. ([irs.gov](https://www.irs.gov/newsroom/treasury-irs-announce-intent-to-issue-proposed-regulations-for-excise-tax-on-excess-tax-exempt-organization-executive-compensation-under-the-one-big-beautiful-bill?utm_source=openai))
- **Complexity & compliance cost:** C-Corps have more rigid tax filings and double taxation issues; LLC/S-Corp require handling K-1s and potential multi-state filings.
## Entity Setup Checklist
- Register in a state (or states) where you’ll operate; check **state-level taxes** and how they conform to federal changes under OBBBA.
- Apply for EIN, prepare bylaws or operating agreements reflecting whether you’ll use election for S-Corp status, if permitted.
- For S-Corp: file Form 2553 timely (often within 2½ months after tax year starts) to be effective for the desired year.
- Consider payroll tax obligations; ensure “reasonable compensation” under S-Corp if owners work in the business.
## Case Example
**Startup “GreenWidget LLC”:** 2026 expected taxable net income $500,000; owners located in California. Because of high federal individual rate (37%), C-Corp’s flat 21% plus dividend tax may lead to combined rates near or above 40%. An S-Corp or LLC taxed as pass-through may pay higher payroll/self-employment taxes, but proper salary + distributions split and QBI deduction may result in lower federal plus state combined tax burden.
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Choosing structure is one one-time but long-term impacting decision. With OBBBA’s shifting rules—especially for top brackets, opportunity zones, and executive compensation—run your numbers carefully.