Microsoft RSU Taxes in Washington (2026)

2026 Microsoft Compensation Benchmarks in Washington

Below is the 2026 tax withholding and April shortfall breakdown across sample Microsoft engineering levels for a Single filer in Washington (at a reference share price of $420/share via Fidelity Investments (NetBenefits)):

Washington Supplemental Tax Regulations for Microsoft RSUs

Washington State levies 0% personal income tax on W-2 wages and ordinary income recognized at RSU vest. However, Washington enforces a 0.58% WA Cares Fund (Long-Term Services and Supports Trust Program) uncapped payroll premium on all W-2 wages and RSU vests unless you hold an approved exemption, plus a 7% Washington Capital Gains Excise Tax on post-vest capital gains exceeding the annual statutory standard deduction.

Washington Bracket Architecture: 0.00% personal wage income tax; 0.58% uncapped WA Cares payroll assessment (unless exempt); 7.0% excise tax on net long-term capital gains above the statutory threshold (~$270,000).

Washington Safe Harbor & Estimated Tax Vouchers (None for wage vests (Federal Form 1040-ES only; WA DOR My DOR portal for 7% Capital Gains Excise Tax))

No Washington state income tax quarterly estimated vouchers are required at vest; however, federal Form 1040-ES quarterly payments remain mandatory to cover the 13%–15% federal supplemental spread.

Multi-State Relocation & Nonresident Sourcing Rules in Washington

Relocating to Washington prior to an RSU vest eliminates state tax on post-relocation service periods, but former residents of California, New York, or Massachusetts remain liable to their departure state for the prorated workday fraction earned prior to establishing Washington domicile.

Employer Stock Plan Specifics: Microsoft (Fidelity Investments (NetBenefits))

Microsoft combines a 4-year on-hire stock award schedule with 5-year quarterly vesting on annual stock refreshers awarded each August/September. Because annual refreshers stack across five overlapping grant years, long-tenured L63–L67 engineers experience steady, high-volume quarterly vests in February, May, August, and November—where Fidelity’s default 22% federal withholding falls 10% to 15% short of their true marginal tax bracket.

Withholding Election Guidance: Inside Fidelity NetBenefits (or Microsoft’s payroll portal), employees can either adjust their federal W-4 Step 4(c) "Extra Withholding" per paycheck or, where enabled for specific stock plan tranches, adjust supplemental withholding percentages in Fidelity prior to the quarterly record date. Adjusting W-4 withholding is often preferred because payroll withholdings are treated by the IRS as paid evenly across all four quarters.

2026 Statutory Parameters Quick Reference