Most California Business Owners Misunderstand Bonus Depreciation. That Mistake Is Costing Them $30,000 or More.

Here is the hard truth about the bonus depreciation income limitation 2025 California landscape: the federal government just restored 100% bonus depreciation, and California still does not conform. That single disconnect between federal and state law creates a gap that catches business owners off guard every single filing season. The ones who plan for it save tens of thousands. The ones who do not end up writing a check to the Franchise Tax Board they never expected.

The One, Big, Beautiful Bill Act (OBBBA), signed into law on July 4, 2025, permanently reinstated 100% first-year bonus depreciation for qualified property placed in service after December 31, 2024. But California Revenue and Taxation Code Section 17250 still rejects bonus depreciation entirely. If you bought a $200,000 piece of equipment in 2025 and deducted all of it on your federal return, California only allows you to deduct a fraction of that amount using standard MACRS schedules. That gap is not theoretical. It is a real, dollar-for-dollar difference that shows up on your Form 540 or Form 100S.

Quick Answer

Federal law under the OBBBA allows 100% bonus depreciation on qualifying assets placed in service in 2025 and beyond with no taxable income limitation. California does not conform and requires standard MACRS depreciation over the asset’s useful life. The result: a California business owner who deducts $150,000 federally in year one may only deduct $21,435 on their state return, creating a timing difference that increases state taxable income by $128,565 and costs roughly $12,000 to $17,000 in unexpected California taxes.

What the Bonus Depreciation Income Limitation 2025 California Rules Actually Say

At the federal level, bonus depreciation under IRC Section 168(k) has no income limitation. This is the part that trips people up. Unlike the Section 179 deduction, which requires sufficient taxable income to claim the full write-off, bonus depreciation can create or increase a net operating loss (NOL). You could have zero income and still take the full bonus depreciation deduction on your federal return.

Here is how it works in practice. Say you run a consulting firm that earns $90,000 in net profit and you purchase $120,000 in qualifying equipment. Under Section 179, you can only deduct up to $90,000 because the deduction cannot exceed your active business income for the year. Bonus depreciation has no such ceiling. You can deduct the full $120,000, creating a $30,000 federal NOL that carries forward to offset future income.

California rejects this entirely. Under R&TC Section 17250 and R&TC Section 24356, the state does not allow any bonus depreciation. Not 100%. Not 80%. Not 40%. Zero. The state requires you to depreciate qualifying assets using the standard Modified Accelerated Cost Recovery System (MACRS) schedule, which spreads the deduction over 5, 7, 15, or even 39 years depending on the asset class.

The Dual Depreciation Schedule Problem

This nonconformity forces every California business owner who claims bonus depreciation federally to maintain two separate depreciation schedules. One for the IRS. One for the FTB. Your tax preparer (or your software) must track the federal basis, the California basis, and the annual adjustment between the two on Schedule CA (540) or Schedule K-1 (100S).

If you skip this step or your preparer does not understand the adjustment, you will either overpay California taxes or underpay and face penalties later. The FTB audits depreciation mismatches more frequently than most business owners realize. According to FTB audit statistics, depreciation adjustments are among the top five areas of examination for small business returns in California.

For a deep dive into how California business owners can build a comprehensive strategy around these rules, explore our California business owner tax strategy hub.

How OBBBA Changed the Federal Bonus Depreciation Landscape Permanently

Before the OBBBA, bonus depreciation was on a scheduled phase-down. Under the original Tax Cuts and Jobs Act (TCJA) of 2017, the rates were set to decline: 80% for 2023, 60% for 2024, 40% for 2025, 20% for 2026, and 0% from 2027 onward. Many business owners rushed to buy equipment in 2022 to lock in 100% before the phase-down began.

The OBBBA erased that entire phase-down. Effective for property placed in service in tax years beginning after December 31, 2024, 100% bonus depreciation is permanently restored. The word “permanently” matters. This is not a temporary extension. There is no new sunset date. Business owners can plan multi-year capital expenditure strategies around 100% federal write-offs without worrying about legislative expiration.

What Qualifies for 100% Bonus Depreciation Under OBBBA

Qualifying property under IRC Section 168(k) includes:

• MACRS property with a recovery period of 20 years or less (equipment, furniture, vehicles, machinery)
• Qualified improvement property (QIP), which covers interior improvements to nonresidential buildings
• Computer software depreciable under Section 167
• Water utility property
• Certain film, television, and live theatrical productions
• Used property (as long as it is new to you and you did not acquire it from a related party)

The property must be placed in service during the tax year. “Placed in service” means the asset is ready and available for use in your business, not just purchased or ordered. If you buy a $75,000 machine in December 2025 but it does not arrive and become operational until January 2026, it goes on your 2026 return.

The Section 163(j) Interest Limitation Connection

The OBBBA also modified the business interest limitation under IRC Section 163(j). For tax years beginning after January 1, 2025, depreciation, amortization, and depletion are added back into the adjusted taxable income (ATI) calculation. This is significant because it means businesses with heavy depreciation deductions can now deduct more of their business interest expense. The IRS issued Revenue Procedure 2026-17 to allow businesses to withdraw prior elections made under the old rules, opening the door to retroactive savings. If you previously elected out of bonus depreciation under Section 168(k)(7), you may be able to reverse that election and take the full 100% write-off.

Our tax planning services help California business owners navigate these layered deduction strategies to maximize both federal and state savings.

The California Nonconformity Trap: Real Numbers That Show the Damage

Let us walk through a concrete example. Marcus owns a general contracting business in Riverside. In 2025, he purchases $300,000 in qualifying equipment: an excavator, a skid steer, and a fleet of work trucks.

Federal Return:

• Bonus depreciation: $300,000 (100% write-off in year one)
• Federal tax savings at 24% bracket: $72,000
• Additional QBI deduction (20% of remaining business income): varies by total income

California Return:

• Bonus depreciation allowed: $0
• MACRS depreciation (5-year property, 200% declining balance): approximately $60,000 in year one
• California taxable income increase vs. federal: $240,000
• Additional California tax at 9.3% bracket: approximately $22,320

Marcus expected a massive tax break across the board. Instead, his California tax bill jumped by over $22,000 because the state forced him to spread $240,000 of deductions across the remaining four years of the MACRS schedule. He gets those deductions eventually, but not when he needs the cash flow most.

Want to estimate how your equipment purchases affect your total tax picture? Plug your business profit into this small business tax calculator to see the numbers before you file.

The Timing Difference vs. Permanent Difference Distinction

California’s bonus depreciation rejection is a timing difference, not a permanent one. You will eventually deduct the full cost of the asset on your state return through regular MACRS depreciation. Over the life of the asset, the total state deduction equals the total federal deduction. But timing matters enormously for cash flow. A $22,000 state tax bill today hurts more than the same amount spread across refunds or reduced liabilities over the next four years.

Smart planning accounts for this. If you know California will add back your bonus depreciation, you can set aside state tax reserves, accelerate estimated payments, or time equipment purchases to align with years where your California income is naturally lower.

Five Strategies to Minimize the Bonus Depreciation Income Limitation 2025 California Gap

Strategy 1: Stack Section 179 Where California Conforms

California partially conforms to Section 179 expensing, allowing up to $25,000 per year (compared to the federal limit of $2,500,000 under OBBBA). While $25,000 is far less than the federal ceiling, it gives you an immediate California deduction that does not require the multi-year MACRS schedule. Use Section 179 for your first $25,000 of qualifying assets on the California return, then apply bonus depreciation to the remainder on the federal return. This reduces the state add-back by $25,000.

Strategy 2: Time Major Purchases for Maximum Cash Flow Impact

If you are planning a $500,000 equipment purchase, consider splitting the acquisition across two tax years. Buy $250,000 in December 2025 and $250,000 in January 2026. You get 100% bonus depreciation federally in both years, but you spread the California MACRS deductions across two staggered depreciation schedules, smoothing out your state tax liability.

Strategy 3: Use the S Corp and AB 150 PTE Election to Offset the State Gap

California’s AB 150 pass-through entity (PTE) elective tax lets S Corps and partnerships pay a 9.3% tax at the entity level and receive a corresponding federal tax credit. This effectively converts your California state tax payment into a federal deduction, bypassing the $40,000 SALT cap under OBBBA. For a business owner with $300,000 in California taxable income, the PTE election can generate $8,000 to $15,000 in additional federal savings that partially offset the lost bonus depreciation at the state level.

Strategy 4: Elect Out of Bonus Depreciation on Specific Assets

Under IRC Section 168(k)(7), you can elect out of bonus depreciation on a class-by-class basis. If the California add-back creates an unmanageable state tax hit, you may choose to forgo bonus depreciation on certain asset classes (for example, 7-year property) and use regular MACRS on both returns. This eliminates the state adjustment for those assets. You lose the accelerated federal deduction, but you gain simplicity and avoid the California cash flow trap. This strategy makes sense when your federal marginal rate is low but your California marginal rate is high.

Strategy 5: Fund Retirement Accounts to Absorb the State Income Spike

The California add-back increases your state adjusted gross income, which can push you into a higher California bracket. Counter this by maximizing retirement contributions that reduce California AGI. A Solo 401(k) allows up to $69,000 in combined contributions for 2025 (or $76,500 if you are 50 or older). A SEP-IRA allows up to 25% of net self-employment income. Both deductions are recognized by California, reducing the sting of the bonus depreciation add-back.

KDA Case Study: Inland Empire Contractor Saves $34,800 Through Dual Depreciation Planning

Rafael, a 48-year-old general contractor based in Ontario, California, purchased $420,000 in equipment for his growing commercial construction business in 2025. His CPA at a national chain took the full 100% bonus depreciation on the federal return but did not properly adjust the California return. When KDA reviewed his draft returns, we found three problems.

First, his California return did not include the required add-back of $420,000 in bonus depreciation, which would have triggered FTB penalties and interest once caught. Second, he had not claimed the California Section 179 deduction of $25,000 that he was entitled to. Third, his S Corp had not made the AB 150 PTE election, leaving roughly $11,000 in federal savings on the table.

KDA restructured his filing strategy. We corrected the California depreciation schedules, claimed the $25,000 Section 179 deduction on the state return, filed the AB 150 PTE election generating $11,400 in federal tax credits, and set up a Solo 401(k) that allowed Rafael to contribute an additional $48,000, reducing his California AGI and dropping him from the 9.3% bracket to the 8% bracket on the marginal dollars above the bonus depreciation add-back.

Total first-year tax savings: $34,800. KDA fee: $4,800. That is a 7.3x return on investment in year one alone, with ongoing savings from the corrected depreciation schedules for the next four years.

Ready to see how we can help you? Explore more success stories on our case studies page to discover proven strategies that have saved our clients thousands in taxes.

The Five Costliest Mistakes California Business Owners Make With Bonus Depreciation

Mistake 1: Assuming California Follows Federal Depreciation Rules

This is the most common and most expensive error. California has never conformed to bonus depreciation under Section 168(k). Not under the TCJA. Not under the CARES Act. Not under the OBBBA. Every year, business owners file returns assuming the federal and state deductions match, and every year the FTB catches the discrepancy. Penalties for underpayment of estimated tax in California start at 7% annually, and the FTB charges interest on top of that.

Mistake 2: Failing to Maintain Dual Depreciation Schedules

Your federal depreciation schedule and your California depreciation schedule must be tracked separately for every asset that received bonus depreciation. If you use QuickBooks or a similar platform, the default setting may only generate one depreciation schedule. You need a manual override or a tax-specific depreciation module to produce the California-conforming schedule. Skipping this step creates compounding errors that grow worse every year as assets are added, disposed of, or fully depreciated on one return but not the other.

Mistake 3: Ignoring the Section 179 California Limit

Many business owners skip Section 179 on the California return because the $25,000 cap seems insignificant compared to the federal limit of $2,500,000. That is $25,000 in immediate California deductions you are leaving on the table every year. Over five years, that is $125,000 in additional state deductions that could have reduced your California tax bill by $11,625 or more.

Mistake 4: Not Adjusting Estimated Tax Payments for the State Add-Back

If your bonus depreciation creates a large federal deduction but California adds it back, your state taxable income could be significantly higher than expected. Business owners who base their California estimated payments on their federal numbers end up underpaying and facing a penalty when they file. Recalculate your quarterly estimated payments using the California-adjusted figures, not the federal ones.

Mistake 5: Missing the AB 150 PTE Election Deadline

The PTE election must be made on an original, timely filed return. You cannot amend to add it later. For calendar-year S Corps, that means the election must be included on the Form 100S filed by the March 15 deadline (or the extended deadline if you file an extension). Missing this deadline means losing a year of federal savings that could have offset your California bonus depreciation gap. As referenced in IRS Publication 946, understanding the interplay between federal depreciation methods and state adjustments is critical for accurate reporting.

Does Bonus Depreciation Create an Audit Risk?

Taking 100% bonus depreciation on your federal return is not inherently risky. The IRS expects businesses to claim it when eligible. The audit risk comes from sloppy documentation, inconsistent schedules, and unreasonable asset classifications.

Keep these records for every asset you claim bonus depreciation on:

• Purchase invoice or sales contract showing the acquisition date and cost
• Evidence of the “placed in service” date (delivery receipt, installation confirmation, first-use log)
• Business use percentage documentation (mileage logs for vehicles, usage records for mixed-use assets)
• The asset’s MACRS class life determination (5-year, 7-year, 15-year, etc.)
• Both federal and California depreciation schedules maintained side by side

The FTB is more aggressive than the IRS on depreciation audits for California businesses. If your federal and state returns show wildly different depreciation figures without a clear Schedule CA adjustment, expect a letter. The fix is simple: document everything and make the adjustment correctly every year.

What If I Already Filed Without the California Adjustment?

If you claimed bonus depreciation on your California return for 2025 without adding back the nonconforming amount, you have two options. First, file an amended California return (Form 540X or amended Form 100S) before the FTB catches the error. This avoids the negligence penalty and limits your exposure to interest on the underpayment. Second, wait for the FTB to issue a notice, which will include both the additional tax and a penalty that typically ranges from 5% to 25% of the underpayment depending on the circumstances.

Filing an amended return proactively is almost always the better move. It shows good faith, eliminates the penalty risk, and gives you the opportunity to claim any deductions you may have missed on the original filing, including the $25,000 Section 179 California deduction.

How Do I Calculate My California Depreciation vs. Federal Depreciation?

Start with the asset’s federal cost basis. For bonus depreciation purposes, the full cost is deducted in year one on the federal return. On the California return, apply the standard MACRS percentage for the asset’s recovery period.

For 5-year property using the 200% declining balance method and the half-year convention:

• Year 1: 20.00%
• Year 2: 32.00%
• Year 3: 19.20%
• Year 4: 11.52%
• Year 5: 11.52%
• Year 6: 5.76%

So a $100,000 asset deducted 100% federally in year one would only yield a $20,000 California deduction in year one. The remaining $80,000 is spread across years two through six. Your Schedule CA must reflect this difference every year until the asset is fully depreciated on both returns.

For 7-year property, the year-one percentage drops to 14.29%. For 15-year property (like qualified improvement property), the year-one rate is just 5.00%. The longer the recovery period, the wider the gap between your federal and California deductions in year one.

Frequently Asked Questions

Is There a Taxable Income Limitation on Bonus Depreciation at the Federal Level?

No. Unlike Section 179, which requires sufficient active business income to claim the deduction, bonus depreciation under IRC Section 168(k) has no income limitation. You can use bonus depreciation to create or increase a net operating loss. This makes it one of the most powerful deductions available to business owners who make large capital investments.

Will California Ever Conform to Bonus Depreciation?

There is no pending legislation or credible indication that California will conform to federal bonus depreciation rules. The state has rejected every version of bonus depreciation since its introduction in 2001. Business owners should plan as though California nonconformity is permanent.

Can I Use Bonus Depreciation on Used Equipment?

Yes, under the OBBBA rules. The property must be new to you, meaning you have not previously used or depreciated it. You cannot acquire it from a related party (as defined under IRC Section 179(d)(2)). Used equipment purchased from an unrelated seller at arm’s length qualifies for 100% bonus depreciation federally. California still does not allow it regardless.

What About Qualified Improvement Property?

Qualified improvement property (QIP) is any improvement to the interior of a nonresidential building placed in service after the building was originally placed in service. QIP has a 15-year MACRS recovery period and qualifies for 100% bonus depreciation federally. On the California return, you must depreciate QIP over 15 years using the standard MACRS schedule. The year-one California deduction on a $200,000 QIP project is just $10,000, compared to $200,000 federally.

How Does the SALT Cap Interact With Bonus Depreciation Adjustments?

Under the OBBBA, the state and local tax (SALT) deduction is capped at $40,000 for both single and joint filers. If your California bonus depreciation add-back increases your state tax liability, that additional state tax may not be fully deductible on your federal return due to the cap. The AB 150 PTE election is the primary workaround, converting your California tax payment into an entity-level deduction that bypasses the SALT cap entirely.

This information is current as of 3/28/2026. Tax laws change frequently. Verify updates with the IRS or FTB if reading this later.

Book Your Bonus Depreciation Strategy Session

If you purchased equipment, vehicles, or made interior improvements to your business property in 2025 and you are not sure whether your California return properly accounts for the bonus depreciation add-back, you are likely leaving money on the table or facing a surprise tax bill. Our team builds dual depreciation strategies that maximize your federal write-off while keeping you compliant with the FTB and minimizing your California cash flow hit. Click here to book your consultation now.

“The IRS gives you 100% depreciation. California gives you a fraction. The business owners who plan for both are the ones who keep the most.”