California OBBBA Conformity 2026: What Small Business Owners Must Know

California OBBBA Conformity 2026: What Inland Empire Small Business Owners Must Know Before Filing

If you’re a small business owner in Moreno Valley, the Inland Empire, or anywhere in California, you may have heard exciting news about the One Big Beautiful Bill Act (OBBBA) — the sweeping federal tax legislation signed into law on July 4, 2025 that permanently extends bonus depreciation, expands the Qualified Business Income (QBI) deduction, restores favorable R&D expensing rules, and delivers a host of other tax-saving provisions for small businesses. The headlines sound great. The problem? California OBBBA conformity 2026 for small business owners is far from automatic — and assuming otherwise could leave your company with a costly, unexpected state tax bill.

At Catalyst CPA Corporation, we’ve been fielding questions from California small business clients all spring about how the OBBBA affects their state taxes. The answer, in most cases, is: less than you think. California’s Franchise Tax Board (FTB) does not automatically adopt federal tax law changes, and while the state made a major update to its conformity date with Senate Bill 711 (SB 711) signed in October 2025, the OBBBA contains several critical provisions that California has specifically decoupled from — meaning you may owe more state tax than your federal return suggests.

This guide breaks down exactly which OBBBA provisions California does and doesn’t follow, what that means for your 2025 tax return (filed in 2026), and what planning steps you should take now. For deeper resources, explore our tax and accounting insights for additional guidance on California-specific planning issues.

What Is the One Big Beautiful Bill Act (OBBBA)?

Enacted on July 4, 2025, the OBBBA is one of the most comprehensive federal tax overhauls since the Tax Cuts and Jobs Act of 2017. For small businesses, the most impactful federal changes include:

• 100% Bonus Depreciation (Permanent): The OBBBA permanently restores 100% first-year bonus depreciation for qualified property placed in service on or after January 19, 2025. Businesses can immediately expense the full cost of most capital asset purchases rather than depreciating them over several years.
• Expanded Section 179 Expensing: Limits are increased, giving small businesses more flexibility on immediate asset expensing elections.
• QBI Deduction Expansion: The 20% qualified business income deduction under Section 199A is made permanent (it was set to expire after 2025), and certain limits and phase-outs are adjusted in favor of small business owners.
• Section 174A — R&D Expense Deduction Restored: The OBBBA introduces Section 174A, which allows domestic research and experimental (R&E) expenditures to be fully deducted in the year incurred, reversing the controversial 5-year amortization requirement that took effect in 2022. Small businesses with gross receipts of $31 million or less may also qualify for retroactive relief.
• EBITDA-Based Interest Limitation (Section 163(j)): The OBBBA permanently reinstates the more favorable EBITDA standard for calculating the business interest expense limitation, effective for years beginning after December 31, 2025.
• Tips and Overtime Deductions: Qualified tips and overtime pay are now deductible on federal returns for tax years 2025–2028, subject to income-based phase-outs.
• New IRS Guidance (IR-2026-59): On April 30, 2026, the IRS issued updated guidance under IR-2026-59 clarifying the implementation of several OBBBA provisions, keeping the law top-of-mind for small business tax advisors heading into summer planning season.

On the surface, these are genuinely powerful tax-savings tools. But here’s the critical question every California small business owner must ask: Does California conform to these OBBBA provisions?

How California OBBBA Conformity 2026 Works — And Why It’s Different

California is a selective conformity state, meaning it does not automatically adopt changes to the federal Internal Revenue Code (IRC). Instead, the state legislature must pass separate legislation to adopt — or explicitly reject — specific federal changes. California’s conformity is governed by the Franchise Tax Board (FTB) and the California Revenue and Taxation Code (RTC).

Historically, California lagged significantly behind federal law. Before October 2025, the state still conformed to the IRC as of January 1, 2015 — a full decade behind. Senate Bill 711 (SB 711), signed by Governor Gavin Newsom on October 1, 2025, made a major correction: it advanced California’s conformity date significantly and adopted many federal tax provisions that had accumulated over the past ten years.

However — and this is where California small business owners need to pay close attention — SB 711 explicitly did not conform to several key OBBBA provisions. The state adopted some changes, modified others, and outright decoupled from the ones that matter most for small business tax planning. Our California small business tax preparation services are specifically designed to navigate this exact complexity.

OBBBA Provisions California Does NOT Conform To in 2026

This is the section your tax preparer needs to have on their desk. Below are the most impactful OBBBA provisions that California has decoupled from, based on the FTB’s official conformity analysis and the California Senate Revenue & Taxation Committee’s Conformity Chart:

1. California OBBBA Conformity 2026: Bonus Depreciation (IRC Section 168(k)) — California Does NOT Conform

This is arguably the biggest trap for California small businesses. Federally, the OBBBA restores 100% bonus depreciation permanently for qualified property placed in service on or after January 19, 2025. For California purposes, bonus depreciation does not apply. California has historically decoupled from federal bonus depreciation rules, and it continues to do so under current law.

What this means in practice: If your Moreno Valley business purchases $200,000 in equipment in 2025 and you take the full federal bonus depreciation deduction, you’ll report $0 of that income federally. But on your California return, you’ll still have to depreciate that equipment over its useful life using MACRS — potentially 5 to 7 years. The result? You’ll owe California income tax on income that didn’t exist on your federal return.

2. Section 174A R&D Expense Deduction — California Has Its Own Rules

The OBBBA’s new Section 174A allows businesses to immediately expense domestic research and experimental costs in the year incurred. For California, the situation is nuanced. SB 711 updated California’s R&D tax credit rules (adopting the Alternative Simplified Credit calculation method), but California’s treatment of R&D expense deductions under Section 174 does not automatically mirror the new federal framework introduced by Section 174A.

California may still require capitalization and amortization of certain R&E expenditures depending on how the FTB interprets the new federal code sections under its rolling conformity rules. This creates a mismatch that can significantly affect biotech, manufacturing, and tech-enabled small businesses in the Inland Empire that invest in product development or process improvement.

The silver lining: California does have its own robust R&D tax credit program (updated under SB 711), which provides a credit of 15% of qualifying research expenses above a base amount (or 1.3% under the new Alternative Simplified Credit method for businesses without prior-year QREs). Work with your CPA to ensure you’re maximizing California’s own R&D credit rather than simply relying on federal deduction parity.

3. Qualified Business Income (QBI) Deduction — California Does NOT Conform

The OBBBA makes the Section 199A QBI deduction permanent at the federal level. This 20% deduction is available to pass-through entities — sole proprietors, S-corporations, partnerships, and LLCs taxed as pass-throughs — and represents one of the most valuable tax breaks for small business owners nationwide.

California has never conformed to the QBI deduction and still does not. California does not recognize the QBI deduction under its personal income tax. If you’re an S-corp owner or sole proprietor in Moreno Valley taking a $40,000 federal QBI deduction, that $40,000 is still fully taxable in California at rates up to 13.3%.

This means California pass-through business owners are paying California income tax on income that is effectively federal-tax-free — a significant and ongoing divergence that requires careful multi-state income planning. Our team’s expertise in California pass-through taxation is specifically built for these scenarios.

4. Section 163(j) Business Interest — Conformity Is Uncertain

The OBBBA permanently reinstates the EBITDA-based limitation for the Section 163(j) business interest expense deduction. Federally, this is a taxpayer-favorable change (EBITDA excludes depreciation and amortization from the calculation, allowing a larger deduction). IRS guidance and major tax advisors have flagged that state conformity to this Section 163(j) change requires careful analysis — particularly in California, where the FTB’s treatment of the EBITDA standard will need to be clarified.

For small businesses carrying significant debt (commercial real estate loans, SBA loans, equipment financing), the difference between EBITDA-based and EBIT-based interest limitations at the state level could meaningfully affect California taxable income.

5. Tips and Overtime Deductions — California Does NOT Conform

The OBBBA creates new federal deductions for qualified tips and overtime pay for 2025–2028. California has not conformed to these deductions. Restaurant owners, hospitality businesses, and other tip-dependent employers in the Inland Empire should note that while tips may receive favorable federal treatment, California will continue to treat tips and overtime as fully taxable wages for state income tax purposes.

6. Health Savings Accounts (HSA) — California Does NOT Conform

California famously does not recognize HSAs for state income tax purposes — contributions are not deductible, and earnings are not tax-exempt at the state level. The OBBBA’s favorable HSA expansions (increased contribution limits, eligibility broadening) provide no California benefit. Small business owners who’ve set up HSA-compatible health plans for their employees should structure their state income tax planning accordingly.

What OBBBA Provisions Does California Follow in 2026?

Not everything in the OBBBA is rejected by California. Thanks to SB 711’s updated conformity date, California now does conform to certain OBBBA-related or pre-OBBBA provisions that were previously outside the state’s adopted IRC window. These generally include:

• Updated Section 179 expensing limits (California now conforms to higher federal Section 179 limits, though with some differences)
• The Alternative Simplified Credit (ASC) methodology for California’s own R&D tax credit program
• Various provisions related to retirement plan rules, estate planning thresholds, and certain business entity elections that were updated in prior-year federal acts now adopted into California law via SB 711
• Some energy credit provisions, though California has its own clean energy incentive framework that may be more advantageous in certain cases

The bottom line: California’s tax code in 2026 is a patchwork — some things align with federal law, many critical ones don’t. There is no shortcut substitute for item-by-item analysis of your specific situation.

Real-World California OBBBA Conformity 2026 Impact: A Moreno Valley Small Business Example

Let’s put this in concrete terms. Suppose you own a Moreno Valley-based S-corporation that provides HVAC services. In 2025, your business:

• Purchases $150,000 in new equipment and takes 100% federal bonus depreciation
• Has $300,000 in qualified business income eligible for the federal QBI deduction ($60,000 federal deduction)
• Spends $25,000 on qualifying R&D activities (process improvement testing)
• Pays $8,000 in qualified tips to employees

The gap between your federal and California taxable income could easily exceed $200,000, generating $20,000 or more in unexpected California state tax — at California’s corporate or personal income tax rates, which can reach 8.84% for corporations and 13.3% for individuals.

This is not a hypothetical. This is the planning trap thousands of California small businesses are walking into right now.

5 Action Steps for California Small Business Owners Navigating OBBBA Conformity in 2026

Frequently Asked Questions About California OBBBA Conformity 2026

The Bottom Line: Don’t Let Federal Good News Create a California Tax Surprise

The One Big Beautiful Bill Act delivers real, meaningful tax savings for small businesses at the federal level — and that’s genuinely good news. But California OBBBA conformity in 2026 remains a significant, largely unsolved problem for small business owners in the state. The provisions that matter most — bonus depreciation, the QBI deduction, R&D expensing, tips and overtime deductions — either do not apply in California or require careful separate analysis.

For small business owners in Moreno Valley, Riverside, San Bernardino, and throughout the Inland Empire, this means your federal and California tax situations are operating under fundamentally different rules in 2026. The planning opportunities and pitfalls are real, and the time to address them is now — before estimated payment deadlines pass and before your 2025 California return is filed with incorrect assumptions baked in. Visit the California Franchise Tax Board website for the latest official conformity updates, or rely on your California CPA to track these changes for you.