State Income Tax Limits Charitable Deductions in WA

The 9.9% tax includes a $100,000 deduction cap, prompting concerns about future non-profit funding.

Updated on Oct. 21, 2026 in Philanthropy

Bold flat-color editorial illustration of a metal donation box on a pedestal, representing the impact of tax policy on non-profit funding. — Washington’s new 9.9% income tax includes a $100,000 deduction cap, triggering concerns from organizations like Seattle Children's Hospital about future funding. AI Illustration. Upload story photo >

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Do you support tax policies that limit deductions for charitable donations to local non-profit organizations?

Seattle Children's Hospital leadership warns that a new state income tax could hinder charitable giving due to a $100,000 cap on charitable deductions. As Washington voters prepare to weigh in on a repeal initiative, hospital administrators fear the tax structure will discourage the high-impact donations necessary to fund uncompensated care.

Why it matters

The tax structure introduces a new financial disincentive for large-scale philanthropy, threatening the supplemental funding models hospitals rely on to bridge gaps in Medicaid reimbursements and research costs. This shift forces organizations to potentially reevaluate donor outreach strategies ahead of the tax's implementation.

Seattle Children's Hospital received $253 million in total donations in 2025, though only 15% of gifts exceeded $100. The proposed 9.9% income tax includes a $100,000 cap on charitable deductions, complicating the fundraising landscape for non-profits.

The players

Seattle Children's Hospital

A major regional healthcare provider that recorded over 600,000 patient visits in 2025.

The details

The 9.9% tax, which takes effect in 2028, features a $1 million standard deduction and a $100,000 cap on charitable giving offsets. By limiting how much a donor can deduct, the policy raises the effective cost of large-scale contributions, leading some tax advisers to suggest that high-net-worth residents consider moving to avoid the tax burden. The hospital notes that these major gifts are essential, as current public funding and insurance reimbursements often fall short of actual operational expenses for patient care and research.

2025: Donors contributed $23 million to the hospital for uncompensated care.
Nov. 3, 2026: Voters will decide on Initiative 645, which would repeal the state income tax.
Jan. 1, 2028: The 9.9% state income tax is scheduled to begin.
2029: Initial income tax payments and returns begin for taxpayers.

Market Landscape

The debate is centered on Initiative 645, a ballot measure that would repeal the state's new income tax and ban future iterations. This vote marks a pivotal point for institutional fundraising models in Washington, contrasting with broader regional trends regarding non-profit revenue sustainability.

Business owners and potential major donors should consult tax counsel regarding the $100,000 charitable deduction cap and the potential lowering of tax thresholds to $250,000. Organizations dependent on high-impact gifts must assess how this cost-shifting may alter donor behavior heading into the 2028 fiscal year.

The takeaway

The proposed tax cap creates a tangible hurdle for non-profits that rely on large-sum donations to subsidize essential services. Operators should monitor the November 3 election results closely, as the outcome will dictate the long-term feasibility of existing capital fundraising strategies.