Stock options and equity compensation are common in California, especially in the technology sector. Restricted Stock Units (RSUs), Incentive Stock Options (ISOs), and Non-Qualified Stock Options (NQSOs) each carry different tax consequences at the federal and California state level. Finding a tax professional who understands equity compensation is essential for employees at startups, publicly traded companies, or those who received options as part of an acquisition.
Why Equity Compensation Is Complicated
- ISOs and the Alternative Minimum Tax (AMT): Exercising Incentive Stock Options does not trigger regular income tax, but it can trigger federal Alternative Minimum Tax. California does not recognize ISO tax treatment — California taxes ISO exercises as ordinary income in the year of exercise.
- RSU taxation: Federally, RSUs are taxed as ordinary income when they vest. California generally conforms to federal RSU treatment, but California-source income rules apply to RSUs granted while you were a California resident, even if you have since moved.
- NQSOs: The spread between exercise price and fair market value at exercise is ordinary income for both federal and California purposes.
California-Specific Complications
California tracks RSU and option income apportionment across years of service in and outside California. If you received options over multiple years and some were earned while working in another state, the calculation of California-source income requires careful analysis. This is a common area for FTB audits.
What to Look for in a Professional
- Experience with ISO/NQSO/RSU taxation for both federal and California returns
- Familiarity with California AMT (which differs from federal AMT)
- Understanding of equity apportionment for multi-state workers
- Experience advising on timing strategies for option exercises
Questions to Ask
- Have you worked with clients who have both ISOs and RSUs from the same employer?
- How do you approach California’s non-conformity to federal ISO treatment?
- Do you have experience with equity grants from pre-IPO companies?
Finding and Verifying Help
Look for CPAs or EAs who specialize in technology sector clients or high-income W-2 employees. Verify CPA credentials at dca.ca.gov/cba and Enrolled Agent status at irs.gov. The CalCPA referral directory allows filtering by specialty area.
Official sources referenced: IRS.gov, California Board of Accountancy (dca.ca.gov/cba), California Franchise Tax Board (ftb.ca.gov). Not reviewed by a credentialed tax professional.