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Business Entity Tax Planning: LLC, S-Corp, C-Corp Guide 2026
The entity structure you choose for your business determines how much of your profit goes to taxes — and for entrepreneurs earning $200,000 or more, that difference can easily exceed $20,000 per year. Self-employment tax alone sits at 15.3% on the first $184,500 of net earnings in 2026, according to the Social Security Administration. The right entity structure either eliminates or dramatically reduces that liability.
This guide covers the core tax treatment of LLCs, S-corps, and C-corps in 2026. It explains when each structure works best, how the One Big Beautiful Bill Act (OBBBA), signed July 4, 2025, changed the math on pass-through income, and what decisions need your attention now. The 2026 tax landscape is meaningfully different from prior years. The QBI deduction is permanent. Bonus depreciation is back at 100%. And the QSBS exclusion just got a $5 million increase.
13 min read
Lenny Whiting
Key Takeaways
Self-employment tax is 15.3% on the first $184,500 of 2026 net earnings. An S-corp election can eliminate SE tax on the distribution portion of income, saving $10,000–$30,000+ annually.
The QBI deduction (20% of pass-through income) is now permanent under OBBBA, effective tax year 2026.
The QSBS gain exclusion was raised to $15 million under OBBBA for stock issued after July 4, 2025.
The SALT cap rose to $40,000 for 2025 through 2029; pass-through entity (PTE) elections remain available and still reduce SE tax.
Section 179 expensing is now $2.5 million, and 100% bonus depreciation is permanent.
What Is Business Entity Tax Planning and Why Does It Matter?
The IRS Statistics of Income division reports approximately 5 million S-corporation returns and over 21 million active LLCs in the US as of the most recent data. Each of those businesses made an entity choice that determines how income is taxed, whether self-employment tax applies, and what deductions the owner can access.
Business entity tax planning is the process of selecting and structuring your legal entity to minimize total tax liability while meeting your legal, operational, and investor requirements. It isn't a one-time setup decision. Income changes, law changes, and business milestones all affect whether your current structure is still optimal.
The three primary structures for operating businesses are:
Sole proprietorship / single-member LLC: Pass-through taxation, full SE tax
S-corporation: Pass-through taxation, partial SE tax avoidance
C-corporation: Entity-level 21% flat rate, no SE tax, potential double taxation
Each structure has a different effective tax rate at different income levels. The right answer depends on how much you earn, how you plan to exit, whether you need outside investors, and which 2026 law changes apply to your situation. For a deeper side-by-side breakdown, see our S-corp vs LLC comparison guide.
LLC vs. S-Corp vs. C-Corp: How Are They Taxed Differently?
A C-corporation pays a flat 21% federal income tax rate on its net income — a rate set by the Tax Cuts and Jobs Act of 2017 and unchanged under OBBBA. When the corporation distributes profits as dividends, shareholders pay qualified dividend tax rates of 15%–20%, creating a double-taxation structure that can reach an effective combined rate above 36%.
An LLC taxed as a sole proprietorship or partnership passes all income through to the owner's personal return. That income is taxed at ordinary income rates and is also subject to the full 15.3% self-employment tax (12.4% Social Security + 2.9% Medicare) on earnings up to the $184,500 Social Security wage base in 2026, with the 2.9% Medicare portion applying to all earnings with no cap.
An S-corp passes income through to owners and avoids entity-level tax, but it introduces one important split: the owner-employee must take a "reasonable salary" subject to payroll taxes, and the remaining profit can be distributed without triggering SE tax.
Dollar example at $300,000 net profit:
Structure | Taxable Method | SE Tax Owed | Notes |
|---|---|---|---|
LLC / Sole Prop | Full $300K subject to SE | ~$28,050 | Hits SS wage base cap at $184,500 |
S-Corp | $120K salary + $180K distribution | ~$18,360 | SE tax only on salary |
C-Corp | $63,000 entity tax | None on corporate earnings | Double tax risk on dividends |
The S-corp saves roughly $9,690 in SE tax at this income level — before factoring in the QBI deduction and other planning tools.
When Does an S-Corp Election Make Sense?
According to the IRS, S-corporations are the most common type of corporation in the United States. The reason isn't complicated: an S-corp election lets business owners pay SE tax only on their reasonable salary, not on profit distributions, which is where the real savings sit.
Here's how it works. An S-corp owner-employee takes a W-2 salary that the IRS considers "reasonable" for their role. Payroll taxes apply to that salary. Any remaining business profit flows through as a shareholder distribution — and that distribution isn't subject to SE tax. The 2026 SE tax rate is 15.3% on the first $184,500 of Social Security-covered earnings, according to the Social Security Administration, plus 2.9% Medicare on everything above that.
Savings example at $300,000 net profit:
If you pay yourself a $120,000 reasonable salary and distribute the remaining $180,000, you owe SE tax only on the salary portion. That's roughly $18,360 in payroll tax versus $28,050 as a sole proprietor — a savings of about $9,690 before accounting for any deductions.
The breakeven point for an S-corp election is generally $75,000–$80,000 in annual net profit. Below that threshold, the additional compliance costs — payroll processing, separate corporate returns, state fees — typically exceed the SE tax savings.
In practice, the "reasonable salary" question is the one that trips up most new S-corp owners. The IRS doesn't publish a fixed formula. CPAs typically reference compensation data from the Bureau of Labor Statistics for comparable roles and document their methodology. Owners who take artificially low salaries to maximize distributions face reclassification risk — and the penalties for misclassification can exceed the tax savings.
Read our detailed S-corp vs LLC tax comparison for a full breakdown of the election tradeoffs.
How Does the QBI Deduction Change the Math for Pass-Through Owners?
The QBI deduction under Section 199A is now permanent, effective tax year 2026, after OBBBA eliminated its scheduled sunset at the end of 2025. Pass-through owners — sole proprietors, partners, and S-corp shareholders — can deduct up to 20% of their qualified business income from federal taxable income.
That 20% deduction is significant. On $300,000 of pass-through income, it reduces taxable income by $60,000, saving $21,600 in federal tax at a 36% marginal rate. Before OBBBA, this deduction was set to disappear. Now it's permanent, and 2026 adds two meaningful improvements.
What changed under OBBBA:
The phase-in window for deduction limitations widened to $75,000 for single filers and $150,000 for married joint filers over the income threshold. More high-income owners now qualify for at least a partial deduction.
A new minimum deduction of $400 applies to any taxpayer with at least $1,000 in qualified active business income. Even owners near the upper income limits get something.
Specified service trades or businesses (SSTBs) — law firms, consulting practices, financial services — still face income-based phaseouts. For 2025 returns, the phaseout begins at $394,600 for married filers.
The QBI deduction stacks on top of S-corp SE tax savings. An S-corp owner taking $120,000 in salary and $180,000 in distributions can claim the QBI deduction on the distribution portion, potentially deducting another $36,000 from taxable income.
According to RSM US, the OBBBA's permanent QBI deduction removes long-term planning uncertainty that previously forced business owners to hedge their entity structure decisions. With the 20% deduction now locked in indefinitely, pass-through entities regain a durable tax advantage over C-corp double-taxation structures for most operating businesses.
See our guide on maximizing the QBI deduction in 2026 for filer-specific strategies.
What Do Founders Need to Know About QSBS and C-Corp Taxation?
For startup founders, Section 1202 Qualified Small Business Stock (QSBS) is one of the most valuable provisions in the tax code — and OBBBA just made it significantly more attractive. The gain exclusion limit rose from $10 million to $15 million per issuer for stock issued on or after July 4, 2025. The company's gross asset threshold was also raised from $50 million to $75 million, allowing more growth-stage companies to qualify.
QSBS only applies to C-corporations. That's a key structural implication: founders who plan to raise institutional capital, build toward an acquisition, or take the company public often structure as C-corps specifically to preserve QSBS eligibility. The 100% gain exclusion for stock held five or more years means a founder exiting a qualifying startup could exclude up to $15 million of capital gains from federal tax entirely.
OBBBA also introduced a tiered holding period. Founders holding stock at least three years now qualify for a 50% exclusion, increasing to 75% at four years, and 100% at five years. That's a meaningful change for founders in early liquidity events.
Does your company qualify? The criteria include: organized as a domestic C-corp, originally issued stock to the founder, active business in a qualifying industry, and gross assets at or below $75 million at the time of issuance. Professional services, financial services, and hospitality businesses are excluded.
Most founders focus on the $15 million per-issuer limit as the headline number — but the per-taxpayer nature of QSBS is equally important. Spouses, trusts, and certain estates each hold their own separate exclusion. A husband-and-wife founding team with separate stock grants can potentially exclude up to $30 million of gain combined. That's not a widely discussed planning point, and it changes the calculus on how equity is structured at formation.
Read our full QSBS exclusion guide for founders for eligibility criteria and planning strategies.
How Does the SALT PTE Election Affect Multi-State Business Owners?
The OBBBA raised the SALT deduction cap to $40,000 for the 2025 tax year, up from the $10,000 limit imposed by the 2017 Tax Cuts and Jobs Act. The cap rises by 1% annually through 2029, then reverts to $10,000 in 2030. For high-income taxpayers with modified adjusted gross income above $500,000, the cap phases down — a 30% reduction for every dollar above the threshold, but never below $10,000.
Pass-through entity tax (PTET) elections remain available and, in many cases, still make sense even with a higher personal SALT cap. Here's why: when a partnership or S-corp pays state income taxes at the entity level, that payment is a fully deductible business expense that reduces federal taxable income for all owners — and it reduces the income subject to SE tax. That's a second-order benefit the individual SALT cap workaround can't replicate.
As of 2025, 36 states and New York City offer PTET elections, according to RSM. The election is particularly useful for owners in high-tax states like California, New York, New Jersey, and Massachusetts, where state income tax can easily exceed the $40,000 cap.
The OBBBA's SALT increase is real but limited — and it's temporary. The $40,000 cap phases out for earners above $500,000 MAGI and disappears entirely in 2030. For business owners in high-tax states earning above the phaseout threshold, the PTET election often delivers more net tax savings than relying on the personal SALT deduction alone, according to Thomson Reuters.
See our SALT PTE election guide for multi-state business owners for a state-by-state breakdown.
What Are the Key 2026 Law Changes Every Business Owner Must Know?
The One Big Beautiful Bill Act, signed into law on July 4, 2025, made the most significant set of permanent tax changes for business owners since the 2017 Tax Cuts and Jobs Act. Here's what matters and when it takes effect.
QBI Deduction: Now Permanent
Section 199A's 20% deduction for pass-through income was set to expire after 2025. OBBBA made it permanent. Pass-through business owners no longer need to hedge entity structure decisions around a sunset they can't predict.
100% Bonus Depreciation: Back and Permanent
The OBBBA permanently restores 100% bonus depreciation for qualifying assets acquired and placed in service after January 19, 2025. Under prior law, bonus depreciation was phasing down: 60% in 2024, 40% in 2025. That phase-down is now reversed. Businesses investing in equipment, machinery, or qualified improvements can write off the full cost in the year of acquisition.
Section 179 Expensing: $2.5 Million Limit
The annual Section 179 expensing limit rose to $2.5 million (with a $4 million phaseout threshold) for property placed in service after December 31, 2024, according to BDO. Both figures are indexed for inflation going forward. This is up from approximately $1.16 million under prior law and is a material change for capital-intensive businesses.
Frequently Asked Questions
What is the minimum income level for an S-corp election to make sense in 2026?
Most CPAs recommend an S-corp election when net self-employment income exceeds $75,000–$80,000 per year. At that level, SE tax savings typically exceed $6,000 annually, which outpaces the additional compliance costs of $3,500–$5,000 for payroll processing and a separate corporate return. Below $75,000, the math rarely favors the additional complexity.
Is the QBI deduction available to all pass-through owners in 2026?
The 20% QBI deduction is available to sole proprietors, S-corp shareholders, and partners in partnerships. Owners of specified service trades or businesses (SSTBs) — including law, consulting, and financial services — face income-based phaseouts. For 2025 returns, the SSTB phaseout begins at $394,600 for married filers. The deduction is now permanent under OBBBA, with no sunset date. See our QBI deduction guide for SSTB-specific strategies.
Can an LLC elect S-corp status, or does it need to be incorporated first?
An LLC can elect S-corp tax treatment by filing IRS Form 2553 without changing its state-level legal structure. The LLC remains an LLC under state law — it's the federal tax classification that changes. This is the most common approach for small businesses because it preserves the liability protection and operational simplicity of an LLC while capturing the SE tax savings of an S-corp.
Does QSBS apply to LLCs or only C-corporations?
QSBS under Section 1202 applies only to C-corporations. An LLC taxed as a pass-through does not qualify. This is one of the primary reasons venture-backed startups and founders planning for an acquisition or IPO form as Delaware C-corps: QSBS eligibility alone can be worth millions of dollars in excluded capital gains. See the full QSBS eligibility and exclusion guide for the complete criteria.
How does the SALT PTE election interact with the new $40,000 SALT cap?
The OBBBA raised the personal SALT cap to $40,000 through 2029, but the cap phases out for taxpayers with MAGI above $500,000. High-income business owners who phase out of the personal SALT deduction can still use a PTE election to pay state taxes at the entity level, where those taxes are a fully deductible business expense. SALT PTE elections remain available in 36 states and New York City as of 2025 and reduce both federal income tax and SE tax on the deducted amount.
QSBS Exclusion: $15 Million
Section 1202 QSBS exclusion increased from $10 million to $15 million for stock issued after July 4, 2025. The qualifying gross assets threshold rose from $50 million to $75 million. A tiered holding period structure (50% exclusion at three years, 75% at four years, 100% at five years) was also introduced.
SALT Cap: $40,000 Through 2029
The SALT cap rose from $10,000 to $40,000 for 2025 through 2029, with a phaseout for MAGI above $500,000. Pass-through entity tax elections remain available nationwide.
Conclusion
Business entity tax planning isn't glamorous, but it's one of the highest-return decisions an entrepreneur makes. Choosing the right structure and optimizing within it — through an S-corp election, the permanent QBI deduction, QSBS planning for C-corp founders, or a PTE election in high-tax states — can save a business owner tens of thousands of dollars per year, compounding significantly over a career.
The 2026 tax landscape is more favorable for business owners than it's been in years. The OBBBA made several key provisions permanent, removed planning uncertainty around the QBI deduction, and expanded deductions like Section 179 and bonus depreciation. Now is the right time to contact our CPA attorney team to review your entity structure.
About Lenny Whiting
CPA Attorney Owner
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