Washington Supplemental Tax Regulations for Stripe 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: Carta / Morgan Stanley at Work
Stripe employees with settled RSUs or participating in internal secondary tender offers face tax withholding at 22% statutory rates. Because shares are illiquid outside tender windows, underwithholding is hazardous: you cannot easily sell additional shares later to satisfy your April IRS obligation.
When vesting at Stripe, Carta / Morgan Stanley at Work 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.