Washington Supplemental Tax Regulations for Google (Alphabet) 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: Charles Schwab / Morgan Stanley
Google utilizes a frontloaded monthly vesting schedule (33% across years 1 and 2). Because monthly vests are treated as supplemental wage distributions, Schwab withholds federal tax at flat 22%. Googlers with total comp above $350k find that each monthly tranche underwithholds by 10% to 15%, compounding silently over 12 months.
When vesting at Google (Alphabet), Charles Schwab / 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.