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RSU Tax Gap Calculator
Estimate whether flat supplemental withholding is likely to trail your real marginal tax rate.
Use this for
- RSU vest weeks
- high-income W-2 employees
- cash set-aside planning
Quick facts
Keep the estimate grounded.
RSU income is usually treated as wage income at vest.
Federal supplemental withholding often starts at 22%.
State tax can turn a small gap into a large cash need.