RSU vesting calculator
Model the federal + state tax on an RSU vesting event against what payroll will withhold.
RSU vesting tax calculator
Model the federal + state tax on a single RSU vesting event, and compare to what your employer will actually withhold.
Warning. Your marginal rate (35%) is higher than the 22% supplemental withholding rate. Plan to owe ~$9,272 at filing, or cover it with an estimated payment before the next quarterly deadline.
Educational estimate · 2025 single-filer brackets · Not tax advice · Model includes federal ordinary + state + Medicare · Excludes NIIT on this wage income
How to read the result
Your employer applies federal supplemental withholding at a flat 22% on RSU vests up to $1M in YTD supplemental wages, then 37% above that. If your actual marginal rate is higher than 22%, you owe the difference at filing. This calculator exposes that gap.
This tool is educational. It uses 2025 single-filer federal brackets, a simplified state-tax model, and does not substitute for a CPA review of your specific facts. For a second set of eyes on a meaningful event, match with a fiduciary advisor who routinely works with equity compensation.
Find a fiduciary advisor who understands equity compensation
Short form. We match you with up to three fee-only advisors who routinely work with RSUs, ISOs, and pre-IPO equity.
Plan your next vesting event with confidence
Free PDF checklist. Quarterly tax-planning cadence for RSU holders, AMT tripwires for ISO exercises, and the 10b5-1 calendar our reviewers send clients.