Are 529 Contributions Tax Deductible in California?

No. California does not allow a state income tax deduction or credit for 529 plan contributions, whether you use California’s own ScholarShare 529 or a plan sponsored by another state.¹ The federal government doesn’t allow a deduction either.² Every dollar going into a 529 in California is contributed with money that’s already been taxed at both levels.

This puts California in a small minority. More than 30 states with income taxes offer some form of deduction or credit for 529 contributions. California offers nothing, so there’s no state tax reason to prefer ScholarShare over any competing state’s plan.

What You Do Get: Tax-Free Growth and Withdrawals

The benefit of a 529 in California is on the back end, not the front. Money inside the account compounds without any annual tax on interest, dividends, or capital gains.³ Over a saving horizon of 10 to 18 years, that sheltered growth is where the real value sits.

When you pull the money out for qualified higher education expenses, both your original contributions and all the accumulated earnings come out free of federal income tax.² California follows the federal treatment on qualified college withdrawals. Qualified expenses include tuition, mandatory fees, books, supplies, room and board for students enrolled at least half-time, computers, and internet access.³

K-12 Withdrawals Are Taxed by California

This is where California families most often get caught. Federal law lets you withdraw 529 funds for K-12 expenses tax-free, and the One Big Beautiful Bill Act signed in July 2025 expanded the list of qualifying K-12 expenses and raised the annual cap from $10,000 to $20,000 per student starting in 2026.⁴ The expanded federal categories now cover:³

Tuition at any public, private, or religious school
Curriculum and instructional materials, including textbooks and online learning resources
Qualified tutoring by unrelated instructors meeting specific credentials
Standardized achievement tests, AP exams, and college admission exam fees
Dual enrollment fees for college courses taken while still in K-12
Occupational, behavioral, physical, and speech-language therapies for students with disabilities

California does not conform to any of these K-12 provisions.⁵ When you use 529 funds for K-12, California treats the earnings portion as a non-qualified distribution. You’ll owe California income tax on those earnings plus a 2.5% state penalty.⁴ A withdrawal that’s fully tax-free on your federal return can still produce a California tax bill. If you’re using a 529 to help pay for private elementary or secondary school, budget for that state hit.

Roth IRA Rollovers Are Also Taxed by California

Federal law since 2024 lets you roll unused 529 funds directly into a Roth IRA for the beneficiary. The federal rules are strict:⁶

The 529 must have been open for at least 15 years
Only contributions made more than five years before the rollover qualify
Each year’s rollover cannot exceed the Roth IRA contribution limit ($7,500 for 2026) and counts against that year’s total IRA contribution allowance⁷
The lifetime total per beneficiary is capped at $35,000³

California does not conform. The Franchise Tax Board treats a 529-to-Roth rollover as a taxable distribution, so the earnings portion is included in your California taxable income and hit with the 2.5% state penalty.⁵ The rollover can still make sense because the money grows tax-free inside the Roth going forward, but factor the upfront California cost into the decision.

What Non-Qualified Withdrawals Cost

Pull money out for anything other than qualified education expenses, and the earnings portion gets taxed twice and penalized twice. Federal treatment: ordinary income tax on the earnings plus a 10% penalty. California adds state income tax on the earnings plus a separate 2.5% California penalty.⁵ Original contributions come back penalty-free since they were taxed on the way in.

California reports the state penalty on Form FTB 3805P. In an account held for many years with significant growth, earnings can make up a large share of the balance, and the combined 12.5% in penalties on top of ordinary income tax at both levels adds up quickly.

How to Pick a 529 Plan With No In-State Incentive

In states that offer a deduction only for the in-state plan, residents feel pressure to use that plan even when fees are high or investment options are weak. California residents don’t have that constraint. You can evaluate any direct-sold state plan on its merits.

California’s ScholarShare 529 caps account balances at $529,000 per beneficiary, though accounts that reach the cap continue to earn investment returns.⁸ Other states set their own limits. When comparing plans, look at expense ratios (direct-sold state plans run roughly from under 0.10% to nearly 1.00%), age-based portfolio quality, minimum contribution requirements, and withdrawal flexibility. Over 18 years of saving, a 0.30% difference in annual fees compounds into thousands of dollars, which in California is worth more than the deduction you’re not getting.

1
State of California Franchise Tax Board. AB 350 Bill Analysis
2
Internal Revenue Service. 529 Plans: Questions and Answers
3
Office of the Law Revision Counsel. 26 U.S. Code 529 – Qualified Tuition Programs
4
ScholarShare 529. Expanded Use of 529 Funds
5
State of California Franchise Tax Board. 2025 Instructions for Form FTB 3805P
6
Internal Revenue Service. Publication 590-A, Contributions to Individual Retirement Arrangements
7
Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026; IRA Limit Increases to $7,500
8
ScholarShare 529. ScholarShare 529 College Savings Plan Frequently Asked Questions