Equity Tax Calculator
See the real tax hit on RSUs, NSOs, and ISOs. Find the gap your employer's withholding leaves behind.
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How RSU Vesting Tax Works
The vest: When RSUs vest, the full share value at that moment is added to your W-2 as ordinary income.
The withholding gap: Most employers withhold federal tax at the flat 22% supplemental rate. If your real marginal rate is 24%, 32%, or higher, the difference is what you'll owe in April.
Plus FICA (7.65%) and state tax always apply on top.
Why Equity Comp Surprises People at Tax Time
The grant number on your offer letter is gross. Between vesting, supplemental withholding, FICA, state tax, and (for ISOs) AMT, the effective rate on equity income often runs 30 to 45% once everything settles. Use TurboTax or talk to a CPA before any large exercise to model the cash flow.