Washington Supplemental Tax Regulations for Apple RSUs
Washington imposes 0% personal state income tax on W-2 wage income and RSU vests. However, when you subsequently sell shares that have appreciated post-vest, long-term capital gains exceeding $262,000 are subject to the 7% WA Capital Gains Excise Tax.
Washington Safe Harbor & Underpayment Penalties
No state wage safe-harbor required. Only federal 1040-ES applies.
Employer Stock Plan Specifics: E*TRADE by Morgan Stanley
Apple vests typically occur in April and October. Employees receiving six-figure vests through E*TRADE will notice that statutory withholding leaves a 10%–15% federal gap when combined with base salary. Knowing exactly how many shares to sell prevents unexpected liquidation during market dips.
When vesting at Apple, E*TRADE by Morgan Stanley calculates automatic sell-to-cover withholding using Washington's statutory supplemental rate of 0.00% combined with the federal supplemental rate (22% on up to $1M). Because top earners in Washington reach marginal brackets exceeding these rates, you will face an incremental shortfall on April 15.
Localized CPA & Advisory Referral
Advisor Guidance: Work with a Washington State fiduciary advisor to navigate the 7% WA Capital Gains Excise Tax on secondary share sales.