California conformity
California does not automatically follow the new federal tax law
California updated its general federal conformity date to January 1, 2025, but the One Big Beautiful Bill Act was enacted later and is not automatically part of California law.
A deduction available on the federal return may be reduced, delayed, or unavailable on the California return. Businesses should build the state adjustment at the same time as the federal work rather than treating California as a copy of the federal calculation.
The timing creates the difference
Senate Bill 711 moved California's general specified conformity date to January 1, 2025. The federal law commonly called the One Big Beautiful Bill Act was enacted after that date, so its provisions require separate California legislation before they apply to the state return.
One transaction can produce two tax results
Federal changes involving depreciation, research costs, interest, individual deductions, and other items may create California modifications. Those differences can continue into future years through basis, depreciation, losses, or carryforwards.
The state adjustment needs its own workpaper
Keep a schedule that starts with the federal amount, identifies the controlling California rule, calculates the current-year modification, and tracks any future reversal. That schedule should reconcile to the California return.
Estimated taxes may also differ
A federal deduction can lower the federal estimate without lowering California taxable income by the same amount. Forecast both liabilities before changing payments.
For every new federal benefit, ask a second question: does California conform? Track the answer and any continuing basis or timing difference in a permanent state workpaper.
Apply the guidance to your facts
Discuss the accounting and tax decisions behind the form.
We begin with the records, entity structure, timing, and decisions that apply to your situation.
Schedule a complimentary callThis article provides general educational information and is not individualized accounting, legal, investment, or tax advice. Tax rules and forms change; confirm the current requirements for your facts before acting.