Updated October 4, 2026. Quick answer: No state deduction, because there is no individual income tax to reduce. The Department of Revenue says “Washington does not currently have an individual income tax”.
What Washington allows for 529 contributions
| Item | What the documents say |
|---|---|
| Treatment | Not applicable: no individual income tax |
| Limit | None |
| Source | Washington Department of Revenue |
A $10,000 contribution by a married couple
A married couple who put $10,000 into a 529 account for one child deducts $0 on a Washington return, because there is no Washington individual income tax return to deduct it on.
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A tax that starts in 2028
The Department also says “a new 9.9% income tax will apply to individuals” and “The new income tax takes effect Jan. 1, 2028”. The page does not say how 529 contributions would be treated under it.
What changes in 2026
No change for 2026. The Department’s page says the new income tax takes effect in 2028.
Federal rules
A state break sits beside the federal rules for 529 plans: the statute is 26 U.S.C. 529 and the IRS explains it in Publication 970, Tax Benefits for Education.
Common mistakes
- Looking for a Washington deduction form; there is none for 2026.
Related: how Washington taxes retirement income, whether Washington taxes pensions, the five questions behind any 529 state tax break, and the state-by-state table of 529 deductions.
Sources
- Income tax: https://dor.wa.gov/taxes-rates/income-tax
Sources: the primary documents linked above, read on October 4, 2026. General information, not tax advice. Your own facts decide the outcome, and a preparer, the plan administrator or the agency itself is the right place to confirm anything consequential.