Reminder California: Senate Bill 711 Income Tax Conformity Update

What Happened?

As a reminder for employers in California, Governor Gavin Newsom signed Senate Bill 711 (SB 711) into law, updating California’s Internal Revenue Code (IRC) conformity date from January 1, 2015 to January 1, 2025, operative for taxable years beginning on or after January  1, 2025, except as otherwise provided.

This change is relevant for any organization that calculates or communicates California taxable wages or income, including employers, payroll teams, and HR professionals. If you process California payroll, support year‑end reporting, or field employee tax questions, this conformity change affects how federal updates interact (or do not interact) with California law. Because California continues its selective conformity approach, federal changes made after the new cutoff date (and many within it) may not automatically carry over.

Overview

• What SB 711 does: Updates California’s IRC “specified date” conformity to January 1, 2025, while keeping California’s long-standing selective conformity approach (California still adopts some federal provisions and rejects others).

• Effective timing: Signed October 1, 2025; generally applies to tax years beginning on/after January 1, 2025.

• What it means in plain terms: California is closer to federal tax rules than before, but California and federal taxable income can still differ in major ways.

Why this matters:

• Employers should not assume federal tax changes automatically apply in California: California uses a conformity “as of” date and then selectively adopts or rejects federal provisions.

• Payroll and employee questions: If employees expect certain federal deductions to reduce California taxable wages, SB 711’s conformity cut-off means California may not follow later federal changes unless California passes separate legislation.

• Tax and planning impacts: Differences can affect tax provisioning, mobility planning, and year-end reporting where California income calculations diverge from federal.
  
  • Note: Many employers assume federal updates automatically apply to California, but the state’s selective conformity means year‑end calculations may still require California‑specific adjustments (e.g., depreciation, R&E costs, NOL rules). Adding these adjustments early helps avoid year‑end surprises and prevents misalignment between federal and California reporting.

Key Risks for Employers

• Incorrect state withholding/reporting assumptions if teams rely on federal rules without checking California conformity.

• Employee confusion and complaints if communications imply California tax treatment changed when it did not.

• Misstated California taxable income if corporate or individual reporting fails to reflect California-specific decoupling areas (e.g., depreciation, R&E)

Additional Details

• Research credit method update: California allows the Alternative Simplified Credit (ASC) (with California-specific lower rates), and the Alternative Incremental Research Credit (AIRC) is no longer available.

• Research & Experimental (R&E) costs: California continues to apply rules based on IRC §174 as of January 1, 2015, meaning California treatment can differ from current federal treatment for R&E capitalization/amortization.

Bottom Line: California’s updated IRC conformity date reduces some differences with federal tax law but still leaves many California‑specific rules in place. Employers should continue verifying whether federal tax changes apply in California, clearly communicate when California treatment differs, and maintain California‑specific adjustments (especially for depreciation and R&E) to ensure accurate reporting.

Source References

• California – SB 711 – Taxation: federal conformity
• California – Bill Analysis – Bill Number SB 711
• California – Franchise Tax Board – Senate Bill (SB) 711 Federal Conformity Bill – Impact to Reporting Alimony Payments

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