How the New 2025 Tax Rules Impact LLCs, S-Corps, and C-Corps (Entity Comparison Guide)

In 2025, the One Big Beautiful Bill Act (signed July 4, 2025) made the 20% Qualified Business Income deduction permanent for pass-through entities like LLCs and S-Corps, raised the SALT deduction cap from $10,000 to $40,000 (adjusting to $40,400 in 2026), and restored 100% bonus depreciation. The federal corporate tax rate for C-Corps remains a flat 21%. The Social Security wage base rises from $176,100 (2025) to $184,500 (2026), while the SE tax rate stays at 15.3%.

LLCs offer maximum flexibility, S-Corps can reduce self-employment tax through salary/distribution splits, and C-Corps provide unique advantages for reinvesting profits and raising capital. New 2026 provisions include mandatory tip reporting on W-2s, expanded employer childcare credits (up to $500K), and HSA eligibility for bronze health plans. The best entity depends on your income level, growth plans, and industry.

If you’re a business owner in 2025, you’ve probably heard some version of this question from your accountant, your business partner, or that one friend who always has tax opinions at dinner parties:

“Should I be an LLC, an S-Corp, or a C-Corp?”

And honestly? The answer just got more complicated — and more consequential.

The One Big Beautiful Bill Act (also called the Working Families Tax Cut Act), signed into law on July 4, 2025, is the biggest tax overhaul since the 2017 Tax Cuts and Jobs Act. It permanently extends some provisions, temporarily boosts others, and changes the math on which entity structure makes the most sense for your business.

Let’s walk through what actually changed, what it means for each entity type, and how to think about this decision like a strategist — not just a taxpayer.

If navigating these changes feels overwhelming, that’s exactly why Otterz built its Tax Agent — AI-powered tax intelligence that helps you stay compliant without drowning in IRS updates.

What Actually Changed in 2025? (The Big Picture)

Before we dive into entity specifics, here’s what happened at the federal level that affects virtually every business structure.

The QBI Deduction Is Now Permanent

The Section 199A Qualified Business Income deduction — the one that lets pass-through business owners deduct up to 20% of qualified business income — was supposed to expire after December 31, 2025. The One Big Beautiful Bill made it permanent.

According to the IRS’s own summary of the OBBB provisions, the law also increased the phase-in limitations for the QBI deduction from $50,000 to $75,000 for single filers ($100,000 to $150,000 for joint filers). That’s meaningful if you’re a higher-earning LLC or S-Corp owner in a specified service trade or business — think law, accounting, consulting, or healthcare.

Why this matters:

If you’re running a pass-through entity (LLC taxed as partnership/sole prop, or an S-Corp), this deduction is now a permanent part of your tax planning toolkit — not something you have to worry about sunsetting.

Industry note:

This is particularly relevant if you operate in law or professional services, healthcare, or consulting/high-tech — industries where the QBI phase-out for specified service trades hits hardest.

The SALT Cap Jumped to $40,000

One of the most talked-about changes: the State and Local Tax (SALT) deduction cap rose from $10,000 to $40,000 for the 2025 tax year.

Here’s the fine print you need to know:

• The $40,000 cap applies to filers with modified adjusted gross income (MAGI) under $500,000 ($250,000 for married filing separately).
• Above $500,000 MAGI, the cap phases down by 30 cents for every dollar over the threshold — bottoming out at the old $10,000 limit once you hit $600,000.
• The cap increases by 1% annually through 2029, then reverts to $10,000 in 2030.
• You must itemize to claim the SALT deduction — and this doesn’t change SALT deductibility for pass-through entities or C-Corps at the business level.

Data source:

The Bipartisan Policy Center’s analysis of the OBBB confirms these mechanics and notes that the overall provision will cost approximately $140 billion over 10 years relative to continuing the old $10,000 cap.

What this means in practice:

If you’re an LLC owner in a high-tax state like New York, New Jersey, California, or Connecticut, and you’re paying $25,000+ in combined state income and property taxes, you just went from deducting $10,000 to potentially deducting the full amount. That’s real money on your federal return.

100% Bonus Depreciation Is Back

For qualifying business property placed in service after January 19, 2025, the OBBB restored 100% first-year bonus depreciation. According to the IRS, businesses can now deduct the full cost of eligible property in the year it’s placed in service, rather than spreading it across multiple years.

This is a big deal for capital-intensive businesses in construction and contracting, restaurants and hospitality, and retail/e-commerce that regularly invest in equipment, vehicles, or tenant improvements.

LLCs in 2025: Maximum Flexibility, but Watch the Self-Employment Tax

LLCs remain the most popular entity choice for small business owners and for good reason. They offer liability protection with minimal formality, and crucially, they give you flexibility in how you’re taxed.

A single-member LLC defaults to taxation as a sole proprietorship. A multi-member LLC defaults to partnership taxation. And either can elect to be taxed as an S-Corp or C-Corp without changing the underlying legal entity.

What’s New for LLCs in 2025

The QBI deduction is now a permanent fixture:

If your LLC is taxed as a sole prop or partnership, you can deduct up to 20% of qualified business income — subject to the income-based phase-outs for specified service trades. With the higher phase-in thresholds ($75,000/$150,000), more LLC owners in professional services can access at least a partial deduction.

Self-employment tax still applies to your share of profits:

According to the IRS, the self-employment tax rate remains 15.3% (12.4% Social Security + 2.9% Medicare). For 2025, the Social Security wage base is $176,100 — meaning the 12.4% portion only applies up to that threshold. Above it, you still owe the 2.9% Medicare tax on all net earnings, plus an additional 0.9% Medicare surtax if your income exceeds $200,000 ($250,000 for joint filers).

That 15.3% adds up fast. An LLC owner netting $150,000 in business profit pays roughly $21,200 in self-employment tax on top of income tax. This is the single biggest reason business owners consider electing S-Corp status.

The SALT cap increase helps LLC owners who itemize:

If you live in a high-tax state and your combined state/local taxes exceed the old $10,000 cap, you could see meaningful federal tax savings for the first time since 2017.

When an LLC Makes Sense in 2025

An LLC is often the right choice if you value simplicity and flexibility — especially if you’re a solo business owner, freelancer, or early-stage startup that isn’t yet profitable enough to justify S-Corp payroll complexity. It’s also ideal if you’re still figuring out your long-term growth trajectory.

Need help keeping your LLC’s books clean and tax-ready? Otterz’s Bookkeeping Services pair AI automation with human expertise to handle the day-to-day so you can focus on growth.

S-Corps in 2025: The Tax-Saving Workhorse (With Strings Attached)

The S-Corp election has long been the go-to strategy for profitable small businesses looking to reduce self-employment tax. The concept is straightforward: as an S-Corp owner, you pay yourself a “reasonable” salary (subject to payroll taxes), then take remaining profits as distributions (not subject to self-employment tax).

That salary/distribution split can save tens of thousands per year. But the IRS has opinions about what “reasonable” looks like and in 2025, they’re watching more closely.

What’s New for S-Corps in 2025

The permanent QBI deduction applies here too:

S-Corp shareholders report their share of business income on their personal returns and can claim up to 20% QBI deduction, subject to the same income thresholds and service-business limitations as LLC owners.

Reasonable compensation enforcement is intensifying:

The IRS has been explicit about cracking down on S-Corp owners who pay themselves artificially low salaries to minimize payroll taxes. If you’re running a profitable S-Corp and paying yourself $40,000 while taking $200,000 in distributions, you’re inviting an audit. The IRS looks at comparable wages for similar roles in your industry and region.

No changes to payroll tax rates:

But the Social Security wage base increased to $176,100 for 2025. If your reasonable salary falls below this threshold (which it does for most small S-Corp owners), you’re still saving the 15.3% self-employment tax on every dollar taken as distributions rather than salary.

The Math That Makes S-Corps Attractive

Let’s say your business nets $200,000 in profit. As a straight LLC (sole prop), you’d owe roughly $28,300 in self-employment tax (calculated on 92.35% of net earnings).

As an S-Corp paying yourself a $90,000 salary, your payroll tax obligation drops to about $13,770 (the combined employer/employee share of FICA on $90,000). That’s approximately $14,500 saved every single year.

Of course, S-Corps come with added complexity: you must file Form 1120-S, issue K-1s to shareholders, run payroll, and maintain corporate formalities. That’s where having the right Tax & Compliance Services partner makes a real difference.

When an S-Corp Makes Sense in 2025

S-Corps typically become worthwhile when net business income consistently exceeds $60,000–$80,000 per year and you’re comfortable with the additional payroll and filing requirements. They’re especially powerful for service-based businesses, consultants, and professional practices.

If you’re in education, nonprofits, or cannabis/CBD  industries with unique compliance considerations talk to a tax advisor before electing S-Corp status. The benefits vary significantly based on your industry’s specific tax treatment.

C-Corps in 2025: Built for Scale, But Double Taxation Remains

C-Corporations are a fundamentally different animal. They’re taxed as separate legal entities, which means the business pays tax on profits at the corporate level, and shareholders pay tax again when profits are distributed as dividends. That’s the “double taxation” you’ve heard about.

So why would anyone choose a C-Corp? Because for certain businesses particularly those raising outside capital, reinvesting heavily, or operating in specific industries the C-Corp structure offers advantages that LLCs and S-Corps simply can’t match.

What’s New for C-Corps in 2025

• The flat 21% federal corporate tax rate remains unchanged. This rate was made permanent by the 2017 TCJA, and the One Big Beautiful Bill didn’t alter it. According to PwC’s U.S. tax summary, the U.S. taxes resident corporations at a flat 21% regardless of income level.
• 100% bonus depreciation is back for C-Corps too. This is particularly valuable for C-Corps in capital-intensive industries like manufacturing, construction, and high-tech startups that are reinvesting profits into equipment, technology, and infrastructure.
• Expanded R&D tax credits. The OBBB restored immediate expensing for domestic research and experimental expenditures. For C-Corps investing in product development, this means you can deduct R&D costs in the year they’re incurred rather than amortizing them over five years. Software development costs performed domestically now explicitly qualify for this treatment.
• Double taxation still applies. When a C-Corp distributes dividends, shareholders pay tax at the qualified dividend rate (0%, 15%, or 20% depending on income). Combined with the 21% corporate rate, the effective total tax rate on distributed C-Corp profits can reach approximately 39.8% at the highest individual bracket — before state taxes.

When a C-Corp Makes Sense in 2025

C-Corps are typically the right choice for businesses that are:

• Raising venture capital or seeking institutional investors (VCs and most institutional investors require C-Corp structure)
• Reinvesting most or all profits back into the business (no double taxation if you don’t distribute)
• Planning for an IPO or acquisition (C-Corp is the standard structure for public companies)
• Leveraging R&D tax credits, energy incentives, or other C-Corp-specific benefits

If you’re scaling a high-tech startup or building a retail/e-commerce brand that needs outside funding, the C-Corp is often the clearest path forward.

For growing C-Corps that need more than bookkeeping, Otterz’s CFO Services and Controller Services provide the financial leadership and reporting infrastructure to support fundraising, board governance, and strategic growth.

Also Read: Texas Franchise Tax for LLCs and S-Corps

Looking Ahead: What’s Changing for Business Entities in 2026?

The One Big Beautiful Bill didn’t just reshape 2025 many provisions roll forward, adjust for inflation, or kick in fresh for 2026. If you’re planning your entity structure or tax strategy beyond this filing season, here’s what you need on your radar.

The One Big Beautiful Bill didn’t just reshape 2025 many provisions roll forward, adjust for inflation, or kick in fresh for 2026. If you’re planning your entity structure or tax strategy beyond this filing season, here’s what you need on your radar.

Key 2026 Numbers Every Business Owner Should Know

• Social Security wage base rises to $184,500. According to the Social Security Administration and confirmed by IRS Topic 751, the taxable earnings cap for the Social Security portion of self-employment tax and FICA increases from $176,100 (2025) to $184,500 in 2026. The self-employment tax rate itself remains 15.3% (12.4% Social Security + 2.9% Medicare). For self-employed individuals, that means the maximum Social Security tax jumps to $22,878 for the year. The additional 0.9% Medicare surtax for high earners ($200,000 single / $250,000 joint) also continues unchanged.
• What this means for your entity decision: If you’re an LLC owner paying SE tax on all net earnings, the higher wage base means slightly more of your income gets hit by that 12.4% Social Security rate. For S-Corp owners, the salary/distribution split becomes even more valuable as the wage base climbs every dollar above your reasonable salary that you take as a distribution avoids this tax entirely.
• The SALT cap adjusts to $40,400. The $40,000 SALT deduction cap increases by 1% for 2026, landing at $40,400. The income-based phasedown threshold ($500,000 MAGI) also increases by 1%. The cap continues through 2029, then reverts to $10,000 in 2030 unless Congress acts again.
• Standard deduction increases. For 2026, the IRS announced the standard deduction rises to $16,100 for single filers, $32,200 for married filing jointly, and $24,150 for heads of household. The seven federal income tax brackets (10%–37%) remain the same, with inflation-adjusted thresholds.
• Federal corporate tax rate stays at 21%. No changes for C-Corps on the headline rate. The flat 21% rate established by the 2017 TCJA remains permanent law.

New Provisions That Kick In or Expand in 2026

• QBI gets a $400 minimum deduction. Starting in 2026, taxpayers with at least $1,000 of qualified business income are guaranteed a minimum QBI deduction of $400 even if the standard 20% calculation would produce a smaller amount. This is a small but notable benefit for very early-stage or lower-income pass-through businesses.
• Mandatory W-2 reporting of tips begins. While 2025 gave employers transitional relief on reporting, 2026 is the year employers must separately report all tips on employee W-2 forms. If your business operates in restaurants and hospitality or any tipped industry, your payroll systems need to be updated before year-end to comply. The IRS has issued proposed regulations listing qualifying tipped occupations.
• Private Mortgage Insurance (PMI) becomes deductible. Beginning in 2026, PMI premiums are treated as deductible mortgage interest under the OBBB. While this is a personal tax provision, it’s relevant for business owners evaluating their overall tax picture especially those whose compensation strategy factors in itemized deductions.
• Employer-provided childcare credit expands dramatically. For tax years beginning in 2026, the maximum employer-provided childcare credit jumps from $150,000 to $500,000 ($600,000 for eligible small businesses with average gross receipts of $32 million or less). The credit rate also increases from 25% to 40% of qualified childcare expenses. This is a major incentive for businesses looking to attract and retain talent, and it’s worth exploring regardless of your entity type.
• Bronze and catastrophic health plans become HSA-compatible. Starting January 1, 2026, bronze and catastrophic health insurance plans are treated as HSA-eligible high-deductible health plans. This expands HSA contribution eligibility for more self-employed individuals and small business owners particularly relevant for LLC and S-Corp owners managing their own health insurance.
• Interest expense deduction reverts to EBITDA basis. The OBBB restored the more favourable EBITDA-based calculation for the Section 163(j) business interest limitation, replacing the more restrictive EBIT-based formula that had been in effect since 2022. This means businesses with significant depreciation and amortization can deduct more interest expense — a notable benefit for capital-intensive operations in construction and retail/e-commerce.
• Charitable contribution floor for C-Corps. Beginning in 2026, corporations must exceed a new minimum threshold before claiming a charitable contribution deduction. If your C-Corp has a significant giving program, this is worth discussing with your CFO advisory team.

What This Means for Your Entity Choice Going Into 2026

The 2026 landscape reinforces a few core themes:

• LLCs feel the pinch of the rising wage base. With the SS wage base climbing to $184,500, LLC owners paying self-employment tax on all net earnings are exposed to slightly more tax each year. If your LLC consistently nets above $80K–$100K, the S-Corp election conversation becomes more urgent with each wage base increase.
• S-Corps remain the self-employment tax optimization play. The salary/distribution split advantage actually grows in value as the wage base rises. An S-Corp owner paying themselves $100,000 in salary and taking $100,000 in distributions saves the 12.4% Social Security tax on those distributions a savings that increases in dollar terms as the base expands.
• C-Corps get stronger employer incentives. The expanded childcare credit, restored interest deduction rules, and continued bonus depreciation make C-Corps increasingly attractive for businesses with employees, significant capital expenditures, or aggressive growth plans. If you’re in healthcare or education with large workforces, the childcare credit alone could justify a fresh look at your structure.
• The planning window is now. With the SALT cap reverting to $10,000 in 2030, tip and overtime deductions sunsetting after 2028, and many provisions adjusting annually, the next few years represent a unique window for tax optimization. Working with a proactive Tax & Compliance partner can ensure you’re capturing these benefits while they last.

How to Choose: A Decision Framework for 2025 and Beyond

Instead of giving you a generic “it depends,” here’s a practical framework:

• Choose an LLC if: You’re a solo operator, freelancer, or early-stage business netting under $60K–$80K. You want simplicity, flexibility, and the option to elect S-Corp or C-Corp taxation later without changing your legal entity.
• Choose an S-Corp (or LLC taxed as S-Corp) if: Your net business income consistently exceeds $80K and you want to reduce self-employment tax. You’re comfortable running payroll and filing a more complex return. You’re a service-based business, consultant, or professional practice.
• Choose a C-Corp if: You’re building a venture-backed startup, planning to raise institutional capital, reinvesting most profits, or need access to R&D credits and corporate-level tax benefits. You don’t plan to distribute earnings as dividends in the near term.

Not sure where you stand? Start with a conversation. Otterz’s team can help you evaluate your current structure and model the tax impact of different entity elections based on your actual numbers.

What About the OBBB Provisions Most People Are Missing?

A few provisions from the One Big Beautiful Bill that don’t get as much attention but could affect your entity decision:

New deduction for tips (2025–2028):

If your business operates in a tipped industry — restaurants and hospitality, for example — employees and self-employed individuals can now deduct qualified tips up to $25,000 annually. This is a brand-new above-the-line deduction, and the IRS has published details on who qualifies.

New deduction for overtime compensation (2025–2028):

Employees receiving qualified overtime under the Fair Labor Standards Act can deduct the premium portion of overtime pay. This doesn’t apply to self-employed individuals, but it’s relevant if you’re structuring compensation for W-2 employees.

Interest on new vehicle loans (2025–2028):

A new deduction of up to $10,000/year for interest on loans used to purchase new personal-use vehicles. Not directly a business provision, but relevant for business owners evaluating compensation and benefit structures.

Final Thoughts: Don’t Set It and Forget It

Here’s the reality that most tax content glosses over: your entity structure isn’t a one-time decision. It should evolve as your business does.

The LLC you formed when you were freelancing might be costing you thousands in unnecessary self-employment tax now that you’re netting six figures. The S-Corp that saved you money at $150K in revenue might not be the right structure when you’re ready to bring on investors. And the C-Corp that made sense when you were venture-backed might need a reassessment if you’re now profitable and considering distributions.

The 2025 tax changes especially the permanent QBI deduction, the SALT cap increase, and restored bonus depreciation have shifted the calculus. Now is the time to reassess, not react.

Need a Strategic Tax Partner?

At Otterz, we’re not just bookkeepers we’re a full AI-powered financial back office. From bookkeeping and tax compliance to controller and CFO-level advisory, we help business owners across every stage make smarter financial decisions.

Whether you’re choosing your first entity or rethinking your current one, book a free consultation and let’s talk through the numbers together.

FAQ

1. Is the QBI deduction permanent in 2025?

   Yes the One Big Beautiful Bill Act made the Section 199A QBI deduction permanent for pass-through entities including LLCs and S-Corps. Starting in 2026, there’s also a $400 minimum QBI deduction for taxpayers with at least $1,000 of qualified business income.

2. What is the SALT deduction cap in 2025 and 2026?

   The SALT cap increased from $10,000 to $40,000 for 2025, with a phasedown beginning at $500,000 MAGI. For 2026, it adjusts to $40,400 (1% annual increase). The cap reverts to $10,000 in 2030.

3. What is the self-employment tax rate in 2025 and 2026?

   The SE tax rate is 15.3% in both years (12.4% Social Security + 2.9% Medicare). The Social Security wage base is $176,100 for 2025 and $184,500 for 2026.

4. Is the corporate tax rate still 21% in 2025 and 2026?

   Yes — the flat 21% federal corporate tax rate for C-Corps, established by the 2017 TCJA, remains unchanged in both years.

5. Can an LLC elect to be taxed as an S-Corp?

   Yes — an LLC can elect S-Corp taxation by filing IRS Form 2553 without changing its legal entity structure.

6. What is bonus depreciation in 2025 and 2026?

   The OBBB restored 100% bonus depreciation for qualifying business property placed in service after January 19, 2025. This continues through 2026 and beyond for eligible assets.