California’s Non-Conformity Creating Nightmare for Taxpayers
The legislature was a game-changer for taxpayers with the introduction of the One Big Beautiful Bill Act (OBBBA), signed into law on July 4, 2025. It reinstated 100 percent bonus depreciation, increased deductions on tips and overtime, and proposed new tax breaks on both businesses and individuals. However, there is a downside to it, as the celebration is unwanted by the people of California.
With the help of the Senate Bill 711 (SB 711), which was signed into law as of October 1, 2025, California revised its date of conformity of its Internal Revenue Code (IRC) to January 1, 2025, one day prior to the OBBBA taking effect.
This is a technicality that makes a nightmare of a two-book federal tax return and a California state tax return that subjects the two to completely different rules. Try to hire experienced tax professionals (like the best tax lawyers) who can help you in a difficult situation.
What is the Conformity Gap?
California shifted its conformity date (the last time was in a decade) to the federal tax provisions passed between 2015 and 2025. But the state intentionally left out all the provisions of the OBBBA by halting the clock on January 1, 2025. This means:
- Federal: 100% bonus depreciation of new equipment.
- California: You receive nothing–you must repay it by instalment.
- Federal: You are deducting qualified overtime and above-the-line tip income.
- California: You remit that income on Schedule CA.
See also: business data analysis review
Learn about Some of The Biggest Headaches
The divergence introduces complexity of compliance in a number of aspects:
a. Bonus Depreciation
The OBBBA permanently reinstated 100 percent bonus depreciation of qualified property. California never policies itself to federal bonus depreciation, and SB 711 does not break the tradition. When your business purchases equipment of $100,000, you are allowed to deduct the entire amount in year one, but you have to depreciate it over 5-7 years in California.
B. What is Section 179?
When the federal limit of Section 179 is over 1 million dollars, California has a much smaller limit of 25,000, which does not even phase out up to 200,000 in total additions to the assets. At the state level, zero Section 179 is normally received by mid-sized businesses.
C. R&D Expenses
OBBBA permits full deductions of expenditure on domestic research and experiment. California has not changed the regulations in the past, which would have amortized in five years.
D. Learn about Overtime and Tip Deductions
New deductions based on overtime and tips: New qualified overtime deductions (up to 12,500) and deductions based on tips (up to 25,000) are all real deductions on taxes. The state of California, however, does not allow such deductions, and therefore, you will have to include the income in your state filing.
Will It Be a Matter for Your Wallet?
The practical impact? The federal taxable income decreases, and California taxable income does not relent. This creates:
1. Estimated Tax Surprises
In case you use your federal forecast to calculate your estimates of the state, you can underpay and pay penalties.
2. Basis Tracking Nightmares
Two sets of books are now required for depreciation assets, one set for federal and one for California.
3. Audit Risk
When the schedule CA is calculated incorrectly in determining the add-back, it can result in FTB investigations.
Tips that Will Help You Survive the Two-Book Trap
To make it through this divide and not lose your head (or your money), do the following:
- Keep Dual Depreciation Schedules: Keep a track of the federal bonus depreciation and the regular MACRS used by California separately, with the help of software or a spreadsheet. This is uncompromising for asset-intensive businesses.
- Run Side-by-Side Projections: Model your federal and California tax impacts before the end of the year. Learn before you go to spend your federal refund on what you will owe Sacramento. Look for a tax expert (like a tax audit attorney) who can help you face any tax-related problems.
- Adjust State and Estimated Payments: With the increase in California taxable income, you might end up paying more. Compute your liabilities in the state of California, not in federal anticipations.
- Following: California snubs OBBBAs: California now complies with the 2017 TCJA regulations on 1031 exchanges (only real property) and alimony treatment. Use these to your advantage.
It is not expected that the OBBBA gap will disappear until at least 2031. It is by the decision of California to freeze conformity as of January 1, 2025, that taxpayers will have to inhabit two universes of taxation.
The key to survival? Planning. Calculate twice, make two sets of books, and never think your federal break is in effect in Sacramento. There is no doubt about non-conformity in the California taxation world.
