California businesses that skip midyear tax reviews pay more than they should every single year. The One Big Beautiful Bill Act (OBBBA) is now reshaping federal tax law. The window to act on critical elections closes faster than most owners expect.
The OBBBA changed bonus depreciation, NOL carryforwards, SALT caps, and pass-through deductions. California conforms to some of these changes, but not all. That gap creates both serious risks and real savings.
This guide covers six OBBBA elections you must review before September 2026, a mid-year checklist, common mistakes to avoid, and exactly when a California business owner should bring in professional tax planning CPA help.
Why Mid-Year Tax Planning in California Is Critical in 2026
The OBBBA introduced the largest federal tax overhaul since the 2017 Tax Cuts and Jobs Act. California’s partial conformity means businesses now operate in a split-tax environment in which federal and state rules calculate income differently for the same transactions.
Most business owners assume tax planning happens in January. That assumption is expensive. The IRS and the California Franchise Tax Board (FTB) require most elections to be made during the tax year, not after it ends. Miss the window, and the election disappears entirely.
A mid-year tax planning service USA review between May and July gives enough runway to act on elections, correct estimated payments, and reposition expenses before Q4 closes your options.
What Is OBBBA and How Does It Impact California Business Taxes
The One Big Beautiful Bill Act passed the House in May 2025. Key provisions include: 100% federal bonus depreciation restored retroactively to January 1, 2025; the SALT deduction cap raised from $10,000 to $40,000 for individuals; Section 199A pass-through deduction extended and expanded; and several TCJA provisions made permanent.
California uses selective conformity, meaning the state evaluates each federal change separately. The result for 2026:
| Tax Area | Federal (OBBBA) | California |
| Bonus Depreciation | 100% (IRC §168(k)) | Not conformed; follows R&TC §17250 |
| Section 199A Deduction | 20% of QBI | Not recognized |
| SALT Cap | $40,000 (individual) | N/A at the state level |
| NOL Carryforward | 80% income limit (IRC §172) | Separate rules under R&TC §24416 |
| PTE Tax Election | Federally deductible | Available under AB 150 |
| Corporate Tax Rate | 21% (permanent) | 8.84% franchise tax |
This split is exactly why OBBBA tax election consulting is not optional for California businesses operating above $200,000 in net income.
6 Critical OBBBA Tax Elections to Review Before September
The OBBBA triggered new elections and reactivated old ones. Most require affirmative filings during the tax year. California’s partial conformity creates additional decisions that do not exist in other states. Review all six before September 15 to protect your estimated tax position.
Pass-Through Entity (PTE) Election Strategy
California’s PTE tax election (AB 150, Revenue and Taxation Code Section 19900) lets S-corporations, partnerships, and multi-member LLCs pay an elective 9.3% state income tax at the entity level. That payment is fully deductible on the federal return, bypassing the individual SALT cap entirely.
For 2026 calendar-year businesses using the installment method, the first PTE payment is due June 15. Miss that date, and the election is gone for the entire year.
Business owners with pass-through income above $200,000. A tax-planning CPA California business team considers this the single highest-ROI election available for California pass-through entities right now.
Depreciation & Bonus Adjustment Elections
The OBBBA restored 100% federal bonus depreciation for qualifying property placed in service after December 31, 2024. California does not conform. Under Revenue and Taxation Code Sections 17250 and 24356, California uses its own depreciation schedules.
This creates a timing mismatch. A business deducting 100% federally can still owe significant California tax on the same asset.
Elect out of federal bonus depreciation under IRC Section 168(k)(7). This aligns federal and California deductions, reduces the California-federal income difference, and eliminates the risk of FTB penalties from mismatched depreciation claims.
Net Operating Loss (NOL) Planning Decisions
Federal NOL carryforwards remain capped at 80% of taxable income under IRC Section 172. California’s rules differ under Revenue and Taxation Code Section 24416, with separate carry-forward periods and income thresholds.
Use the carryforward now against 2026 income, or hold it for a projected higher-income year. A mid-year tax planning service USA review should include a side-by-side federal vs. state NOL model based on your Q1-Q2 actuals and Q3-Q4 projections.
SALT Deduction Optimization Strategy
The OBBBA raised the individual SALT deduction cap to $40,000, phasing out above $500,000 AGI. Business owners now rely on the expanded individual SALT deduction or use the PTE election at the entity level.
You cannot run both strategies simultaneously on the same income. The decision depends on entity type, owner income, and pass-through amounts.
OBBBA tax election consulting runs both scenarios and shows the lower combined federal-plus-California effective tax rate. For most S-Corp owners above $300,000 in income, the PTE election still outperforms the expanded SALT cap.
Entity Structure Election (LLC vs S-Corp vs C-Corp)
The OBBBA made the 21% federal corporate rate permanent. It also extended the Section 199A 20% pass-through deduction, but California still does not recognize it. A California LLC taxed as an S-Corp pays the 1.5% California franchise tax plus California individual rates on pass-through income, with zero Section 199A benefit at the state level.
For businesses with net income above $400,000, a C-Corp conversion may reduce the combined federal-California effective rate. This is not a suggestion for everyone. It requires a projection model. A tax planning firm for California businesses should run this comparison before Q3.
Multi-State Nexus & Apportionment Elections
If your California business has employees, customers, or inventory in other states, you have multi-state tax exposure. California uses a single-sales-factor apportionment formula for corporations under Revenue and Taxation Code Section 25128.7.
The OBBBA’s bonus depreciation changes create wide federal-California income gaps. Those gaps also affect how income gets apportioned across states. A nexus and apportionment audit done now prevents overpaying in one state and underpaying in another, which triggers penalties in both.
Mid-Year Tax Planning Checklist for California Businesses
Here is a brief checklist with the most important aspects to review during mid-year to avoid any surprises at the year-end.
Revenue & Profit Projection Review
Pull actual Q1 and Q2 income and expense numbers. Build a Q3-Q4 projection. Check whether you are approaching thresholds that affect PTE eligibility ($1 million net income phase-out), NOL deduction limits, or safe harbor estimated tax calculations. Adjust quarterly payments if your 2026 income is tracking above 2025 actuals.
Expense Timing Strategy
Equipment purchases placed in service before December 31 qualify for 100% federal bonus depreciation. If that creates a California mismatch, elect out before filing. Prepaying deductible expenses like business insurance or rent can reduce Q4 taxable income without changing your cash position significantly.
Payroll & Estimated Tax Adjustments
California requires quarterly estimated payments: April 15, June 15, September 15, and January 15. If Q1-Q2 revenue exceeded your projections, the Q3 payment due September 15 needs to reflect updated income. Use the annualized income installment method (Form 2210 federally, FTB 5805 for California) to avoid an underpayment penalty.
Common Mid-Year Tax Planning Mistakes to Avoid
- Missing the PTE June 15 installment: This single mistake eliminates the California PTE election for the entire year. There is no extension and no retroactive filing.
- Applying federal bonus depreciation to California returns without adjustment: California does not conform. Copying the federal schedule to your state return triggers an FTB audit.
- Ignoring estimated tax safe harbors: The federal safe harbor is 100% of prior year tax, or 110% if AGI exceeded $150,000. California applies the same percentages but calculates them separately on its own return.
- Assuming entity type cannot change mid-year: New businesses and restructured entities can still make elections mid-year with proper IRS and FTB filings. Most owners never ask.
How a California Tax Planning Consultant Helps You Save More
A California tax planning consultant builds multi-scenario projections using your actual income data. They identify which OBBBA elections apply to your entity type, income level, and ownership structure. They also coordinate federal and state elections so one decision does not create a penalty on the other return.
The difference between reactive return preparation and a proactive business tax strategy advisor is typically $15,000 to $80,000 in annual tax savings for California businesses earning $400,000 to $2 million in net income. That range reflects actual outcomes from PTE election implementation, depreciation timing decisions, and NOL optimization plans.
When Should You Hire a Business Tax Strategy Advisor?
Hire a business tax strategy advisor before your business crosses $200,000 in annual net income. Below that level, standard return preparation usually covers the basics adequately. Above it, OBBBA elections, PTE deadlines, NOL decisions, and multi-state nexus create complexity that the return software does not handle.
For 2026 specifically, if you have not had a mid-year review by July 1, you are already behind the September 15 Q3 deadline and the OBBBA election windows running parallel to it.
Federal vs California Tax Differences You Must Consider
California and federal tax law are not the same document. Several OBBBA provisions that lower federal tax liability have no California equivalent. Planning based on federal rules alone, and applying that plan to California returns, creates overpayments, mismatches, and audit risk.
The six areas where California diverges most from OBBBA federal rules are: bonus depreciation, Section 199A, SALT cap treatment, NOL rules, PTE mechanics, and corporate vs. franchise tax rate structures. Every California business earning above $200,000 needs a dual-track federal-state analysis before filing 2026 returns.
Why DIY Tax Planning Fails for Growing Businesses
Tax software files only the events. It does not make elections. TurboTax does not alert you that your California PTE installment was due June 15. QuickBooks does not flag that federal bonus depreciation is creating a California depreciation mismatch that triggers penalties.
A professional tax planning firm builds year-round strategies using actual income projections. The benefit of access to election mechanics, deadline calendars, and dual-state modeling that software products do not offer.
Work With a Tax Planning CPA in California
The 2026 tax year has more elections, more deadlines, and more California-federal divergence than any year since 2017. The OBBBA changed federal law. California’s partial conformity created a second layer of decisions on top of every federal one.
Focus CPA Firm helps you with structured, proactive tax planning built around election timing, not year-end cleanup. We model PTE elections, depreciation strategies, and entity structures using your real financials, so decisions reduce combined federal and California taxes.
We track every deadline, align elections across jurisdictions, and adjust your strategy before penalties or missed opportunities hit. Contact us, and Focus CPA Firm fixes it before it’s too late.
Frequently Asked Questions
Mid-year tax planning is a structured review of your income, elections, and estimated payments done between April and September. It lets you act on time-sensitive elections like California's PTE, adjust Q3 estimated payments before penalties hit, and reposition expenses before year-end options close. Waiting until January means every major 2026 election has already expired.
You lose that election permanently for the tax year, no exceptions. Missing California's June 15 PTE installment eliminates the entire election for 2026. The IRS does not grant retroactive elections for timing-sensitive decisions like IRC Section 168(k) opt-outs or PTE filings under Revenue and Taxation Code Section 19900.
California does not conform to 100% federal bonus depreciation, Section 199A pass-through deductions, or the OBBBA's expanded $40,000 SALT cap. California uses its own NOL rules under R&TC §24416, its own depreciation schedules, and its own PTE structure under AB 150. The same income produces two different taxable amounts on two different returns.
Yes, once net income crosses $200,000. A tax-planning CPA California business team handles OBBBA elections, California-federal mismatches, and multi-state exposure that tax software skips entirely. For most California S-Corp owners above $300,000 in income, one missed PTE election costs more than an entire year of CPA fees.
A PTE election lets your California S-Corp, partnership, or LLC pay 9.3% state income tax at the entity level. That payment is fully deductible on your federal return, bypassing the individual SALT cap. For owners with pass-through income above $200,000, the federal deduction from the PTE election almost always exceeds the election cost.
Start by June 1, 2026. The California PTE installment deadline is June 15. The federal and California Q3 estimated tax deadline is September 15. Both require updated income projections and election decisions made before those dates. Starting in October is too late to act on the highest-value elections available to California businesses this year.
