You can use a 529 plan for private school in California, but the state will tax you for it. Federal law lets you pull up to $20,000 per student per year from a 529 to pay K-12 tuition with no federal tax and no federal penalty. California has refused to go along. The state treats every K-12 withdrawal as a non-qualified distribution, taxes the earnings portion as ordinary income, and tacks on an extra 2.5% penalty on those same earnings.1Franchise Tax Board. 2025 Instructions for Schedule CA (540)
Why California Taxes K-12 Withdrawals
The Tax Cuts and Jobs Act of 2017 opened 529 plans up to K-12 tuition at the federal level, and Congress later raised the annual cap to $20,000 per beneficiary. California declined to conform. The Franchise Tax Board says so plainly in its Schedule CA instructions: “California law does not conform to federal law regarding the IRC Section 529 account funding for elementary and secondary education or to the maximum distribution amount.”1Franchise Tax Board. 2025 Instructions for Schedule CA (540)
For California, the only qualified 529 expenses are those tied to college and other post-secondary education. Anything you pull for elementary or secondary tuition is non-qualified at the state level, no matter how the IRS treats it.
Your original contributions come back tax-free because you already paid California income tax on that money before you deposited it. The investment growth is what the state goes after. On top of ordinary income tax on those earnings, California charges an additional 2.5% penalty on the earnings portion of any non-qualified 529 distribution.2Franchise Tax Board. 2025 Instructions for Form FTB 3805P Additional Taxes on Qualified Plans (Including IRAs) and Other Tax-Favored Accounts California’s marginal income tax rates run from 1% to 12.3%, so a family in the 9.3% bracket pays a combined 11.8% on 529 earnings used for K-12 tuition. Years of tax-free growth can get chewed up in a single withdrawal.
What the Tax Bill Looks Like
Say you take $15,000 out of your child’s 529 to pay private school tuition. Of that, $10,000 is money you originally contributed and $5,000 is investment growth. The numbers work out like this:
- Federal tax: $0. The withdrawal is a qualified K-12 distribution under federal law.3Internal Revenue Service. 529 Plans – Questions and Answers
- California income tax on the $5,000 in earnings at a 9.3% marginal rate: $465.
- California 2.5% penalty on the $5,000: $125.
- Total California cost on a $15,000 withdrawal: $590.
The damage scales with how much of the account is growth. An account you funded a decade ago and invested aggressively will have a much higher ratio of earnings to contributions than one you opened last year, and every withdrawal carries that ratio with it. Some California families deliberately open a second 529 for near-term K-12 tuition and keep it in conservative investments, so the taxable earnings portion stays small.
The $20,000 Federal Limit and How It Aggregates
Federally, the cap is $20,000 per beneficiary per year across all 529 accounts held for the same student.4Office of the Law Revision Counsel. 26 U.S.C. 529 – Qualified Tuition Programs If grandparents keep a separate 529 for the same child, their withdrawals count against the same $20,000 ceiling. Coordinate before either account writes a tuition check. Anything above $20,000 becomes a non-qualified distribution at the federal level too, which brings in a 10% federal penalty on the excess earnings on top of everything California already charges.
How to Report a K-12 Withdrawal in California
Your 529 administrator will send you Form 1099-Q after any year you take a distribution. Box 1 shows the gross distribution, Box 2 the earnings, and Box 3 the basis.5Internal Revenue Service. Instructions for Form 1099-Q (04/2025) The Box 2 earnings figure is what California cares about.
Because the federal return excludes qualified K-12 earnings from adjusted gross income, they don’t flow onto your California return automatically. You add them back on line 8z of Schedule CA (540) as an income adjustment.1Franchise Tax Board. 2025 Instructions for Schedule CA (540) Then you calculate the 2.5% penalty on Form FTB 3805P, Part II.2Franchise Tax Board. 2025 Instructions for Form FTB 3805P Additional Taxes on Qualified Plans (Including IRAs) and Other Tax-Favored Accounts Both amounts carry over to Form 540.
Skipping either step doesn’t save money. The FTB can reach back four years, and interest accrues on what you should have paid. Keep tuition invoices, payment receipts, and your annual 529 statements so you can prove both the amount of tuition and the contribution history behind the withdrawal.
No California Deduction on the Way In, Either
Roughly 30 states give residents a state income tax deduction or credit for 529 contributions. California is not one of them. There is no state tax benefit for putting money into ScholarShare 529 or any other 529 plan.6ScholarShare 529. How Does A 529 Plan Work In California? Federal law offers no deduction either. So Californians get no state break going in, and face a tax and a penalty coming out if they use the funds for K-12.
One small silver lining: because California doesn’t reward you for staying in-state, there’s no cost to picking an out-of-state 529 with lower fees or better investment choices. The playing field is level.
When Using a 529 for Private School Still Makes Sense
The state tax hit doesn’t automatically kill the strategy. It depends on your numbers.
The math works best when the account is relatively new and most of the balance is still contributions, which keeps the taxable earnings portion small. It also helps when your California marginal rate is at the lower end of the bracket range. Families with large 529 balances they don’t expect to spend on college sometimes prefer paying California’s income tax plus 2.5% on K-12 tuition over taking a fully non-qualified withdrawal later, which brings a 10% federal penalty on top of federal and state income tax on the earnings.
Before you write the tuition check from the 529, run the withdrawal both ways: 529 now versus paying cash and preserving the 529 for college. The earnings-to-contribution ratio in your account and your marginal state rate will decide which one wins.
Coverdell ESAs as a Supplement
Coverdell Education Savings Accounts have covered K-12 expenses since well before the 2017 federal 529 expansion, and California doesn’t treat Coverdell K-12 withdrawals the way it treats 529 K-12 withdrawals. Coverdells also cover a broader slice of K-12 costs, including books, supplies, uniforms, and tutoring.
The limits are the problem. Total contributions to all Coverdells for one beneficiary cannot exceed $2,000 a year.7Internal Revenue Service. Topic no. 310, Coverdell Education Savings Accounts Contribution eligibility phases out between $95,000 and $110,000 of modified AGI for single filers, and between $190,000 and $220,000 for married couples filing jointly. Many California families paying private school tuition earn above those cutoffs.
If you qualify, one workable structure is to use the Coverdell for K-12 books and supplies and hold the 529 for college, sidestepping the California penalty entirely.