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Delawareworking inWashington
No Income Tax — nothing to file here

Washington

Work State Tax Rate
None on wages. Capital gains tax: 7% on first $1M plus 9.9% total above $1M ($278K deduction). SB 6346 (signed March 30, 2026): new 9.9% income tax on individual income over $1M, effective January 1, 2028; no paycheck withholding — taxpayers pay estimated taxes directly starting July 1, 2029. Subject to legal challenges and a potential voter referendum.
Withholding Starts
N/A (no income tax on wages through 2027; millionaires' tax begins 2028 via self-pay estimated taxes)
Law Last Updated
Mar 30, 2026

Employee Obligations (Which Returns YOU Must File)

Washington has no state income tax. File your Delaware return only. No nonresident return needed in Washington.

Employer Obligations (What Your Employer Must Withhold & Remit)

Register for unemployment, PFML, and WA Cares. Must withhold employee shares of PFML and WA Cares. Workers' comp is a monopolistic state. Unemployment applies to the first $78,200 of wages. PFML employer contribution is approximately 0.323% for employers with 50 or more employees. No employer withholding obligation for the new millionaires' tax.

City & Local Income Taxes (Extra Filings Beyond the State Return)

None for wage earners.

Other Paycheck Deductions (Disability, Paid Leave, Unemployment)

PFML approximately 0.74% plus WA Cares 0.58% (no cap) totaling approximately 1.32% even without income tax.

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Related guides

Employee/Individual Tax Source: https://paidleave.wa.gov/
Employer/Withholding Source: https://paidleave.wa.gov/employers/
Row last reviewed: May 7, 2026Home state credit form: Schedule W

This is general information, not tax or legal advice. Laws change frequently. Always consult a licensed CPA or tax attorney for your specific situation. All information researched as of March 21, 2026.