By Kevin Luu, Co-Founder and Chief Learning Officer. Reviewed on 2026-09-30.
No. California does not allow a state tax deduction for 529 plan contributions, whether you use the state’s own ScholarShare 529 or any other state’s plan, and that is still true for 2026. Washington has no deduction either, because it has no wage income tax in 2026. The federal government does not allow a deduction for 529 contributions at all.
What a 529 does give a California or Washington family is tax-free growth: earnings are not taxed while invested, and withdrawals for qualified education expenses are free of federal tax and, for expenses California also treats as qualified, free of California tax. For a household in the top brackets, that can be worth far more than the state deductions families in other states receive. This page explains the rules, shows the numbers for a $1.35 million household, and covers the decisions that actually move the result.
Why California has no 529 deduction in 2026
California does not offer a deduction for 529 contributions. A 2025 bill, SB 529, would have created one starting in 2026. Its status in the Legislature’s records is “Inactive Bill – Died”. If you read elsewhere that ScholarShare contributions now reduce your California taxable income, that information is wrong.
California does follow the core 529 treatment. Earnings grow without California tax, and qualified withdrawals are not taxed by California. Where California parts ways with federal law is on newer expense categories. The FTB’s 2025 Form 540 booklet says California generally does not conform to the 2025 federal tax law (P.L. 119-21), and the new 529 expense categories are among the items it does not follow. A withdrawal that is qualified on your federal return can still be taxable on your California return.
Washington: no deduction now, and a new income tax from 2028
Washington does not currently have an individual income tax, so there is nothing for a 529 contribution to be deducted from. That changes for high earners. The 2026 Legislature enacted a 9.9% tax on individuals and joint filers with AGI over $1,000,000, effective January 1, 2028. The Department of Revenue has not yet published how the income definition works, and nothing published so far creates a 529 deduction. Treat any claim of a future Washington 529 deduction as unconfirmed until DOR guidance says otherwise.
Washington families already face the state’s 7% capital gains tax on long-term gains above the annual standard deduction ($278,000 for 2025, the latest published figure), rising to 9.9% on taxable gains above $1,000,000. That matters when you compare a 529 against a regular brokerage account, because a large sale from the brokerage account to pay tuition can trigger it.
What a 529 does and does not do on your federal return
- No deduction. IRS Publication 970 is explicit that contributions to a qualified tuition program are not deductible. See are 529 contributions pre-tax? for how this compares with a 401(k) or a dependent care FSA.
- Tax-free growth. Earnings are not taxed while they stay in the account, and they are not taxed when withdrawn for qualified education expenses.
- Gift rules apply. A contribution is a gift to the beneficiary. For 2026, each parent can give $19,000 per child without using lifetime exemption, or $38,000 as a couple. The five-year election lets each donor put in up to $95,000 per child at once ($190,000 for a couple) and treat it as spread over five years, reported on Form 709.
- Penalty on the wrong withdrawal. Earnings in a non-qualified withdrawal are taxed as income and, per Publication 970, generally face an additional 10% federal tax. The part of the withdrawal that is your own contributions is not taxed.
Worked example: what tax-free growth is worth at $1.35 million of income
Assumptions (illustrative): a married couple in Palo Alto, one a Genentech scientist and one a physician, with $1.35 million of W-2 income and about $1.2 million of taxable income. Their daughter is one year old. In January 2026 each parent elects five-year treatment and they put $190,000 into a 529 together. We assume a 6% average annual return (hypothetical, not a forecast) for 17 years.
| 529 plan | Taxable brokerage, California | Taxable brokerage, Washington | |
|---|---|---|---|
| Starting amount | $190,000 | $190,000 | $190,000 |
| Value after 17 years at 6% | about $511,600 | about $511,600 before tax | about $511,600 before tax |
| Gain | about $321,600 | about $321,600 | about $321,600 |
| Marginal tax on the gain | 0% if spent on qualified expenses | 36.1% (20% federal + 3.8% NIIT + 12.3% California) | 23.8% federal, plus WA’s 7% if the year’s gains exceed its standard deduction |
| Tax on the gain | $0 | about $116,100 | about $76,500 or more |
How the rates were built: for 2026 the federal 20% long-term capital gains rate applies to joint taxable income above $613,700, and the 3.8% Net Investment Income Tax applies above $250,000 of MAGI. California has no lower rate for capital gains; at $1.2 million of taxable income the couple sits in the 11.3% bracket on the 2025 schedule (the latest published) plus the 1% Behavioral Health Services Tax on income over $1,000,000, so 12.3%. The table is simplified. It assumes all gains are realized in one year and ignores the yearly tax on dividends in a brokerage account, which makes the real gap larger, not smaller.
Put next to that, a state deduction is small. Even at California’s 12.3% marginal rate, a deduction on the full $190,000 would have been worth about $23,400 once. The tax-free growth is worth about five times that, and California families get it without any deduction.
The decisions that matter more than a deduction
1. Choose the plan on cost and investments, not residency
Because California gives no in-state benefit, a California family can use ScholarShare or any other state’s plan with no tax difference. Compare total annual cost, the age-based portfolio design, and how easy it is to change owner and successor owner. For the paperwork side, see our notes on transferring 529 ownership.
2. Decide whether to front-load
Money that goes in at age one has 17 years to compound tax-free; money that goes in at age 12 has six. The five-year election is the main lever for a family with cash from RSU vests or a bonus. The trade-off: after electing the full $95,000, those parents cannot make further annual-exclusion gifts to that child for five years without using lifetime exemption. Superfunding versus yearly contributions covers the timing in more detail.
3. Coordinate with grandparents
A grandparent who lives in a state with a 529 deduction may be able to claim their own state’s deduction on what they contribute, sometimes only if they own the account or use their home state’s plan. That deduction belongs to the grandparent’s state return, not yours. Ask them to check their state’s rules before opening an account, and agree in writing who owns it and who the successor owner is.
4. Size it against other options
A 529 is the right tool for education money. It is the wrong tool for money you might want to give a child for a first home or a business. A custodial account or a trust covers those goals, with different rules on control: a custodial account typically passes to the child somewhere between 18 and 25, depending on the state and how it was set up. See 529 plans versus custodial accounts.
Common mistakes we see in California and Washington
- Opening ScholarShare because of an expected state deduction that does not exist.
- Assuming every federally qualified withdrawal is also tax-free in California. Check each expense category against California rules before withdrawing.
- Electing five-year treatment and then also giving the same child annual-exclusion gifts in the same window.
- Forgetting to file Form 709 for the five-year election. The election is made on the return.
- Naming no successor owner, so the account may have to pass through the parent’s estate if that parent dies.
What to write down for your children
The account is the easy part. What children rarely inherit is the reasoning: why you funded education and not something else, what you expect them to contribute, and what happens to money that is left over. A one-page note kept with the account (who owns it, who takes over, and what the money is for) lets the next owner make the same decision you would. This is the kind of record we build into the FamilyKnowledge® Library through Age Five Wealth Education.
Frequently asked questions
Can a California resident get another state’s 529 deduction by using that state’s plan?
No. A state 529 deduction reduces that state’s income tax, so it generally only helps people who owe income tax to that state. A California resident who opens another state’s plan gets the same treatment as one who uses ScholarShare: no deduction, tax-free growth, and California-tax-free qualified withdrawals. Choose the plan on cost and investment options.
Are 529 contributions deductible on my federal return in 2026?
No. IRS Publication 970 states that contributions to a 529 plan are not deductible. The federal benefit comes later: earnings grow untaxed and qualified withdrawals are free of federal income tax. For a family paying 23.8% on investment gains, that benefit can be large over 15 or more years of compounding.
Will Washington’s 2028 income tax include a 529 deduction?
Nothing published by the Washington Department of Revenue says so. The new 9.9% tax on AGI over $1,000,000 starts January 1, 2028, and DOR guidance on the income definition is still pending. Plan on no deduction, and revisit when DOR publishes details.
Next step
If you have a child under five and have not funded a 529, the useful question is how much to put in this year and from which source (cash, RSU proceeds or a bonus), not which state to pick. Our Tax & Wealth Assessment runs that calculation against your full tax picture. This article is general education, and the right move depends on the family’s full picture.
Kevin has advised high-income W-2 tech and biotech families since 2015, and leads the education-first Age Five Family Office from Brea, California.
Connect on LinkedIn → · About KevinThis is part of how we approach Age Five Wealth Education for high-income W-2 families at Bright Advisers.
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