Calculators that know about equity
Each tool has equity-specific defaults: supplemental withholding gaps, AMT preference items, QSBS eligibility, trailing state tax. Nothing generic.
One vesting event, federal + state + Medicare, compared to what payroll actually withholds.
Bargain element, Form 6251, federal AMT math for an exercise-and-hold decision.
True after-tax return of a qualified 15% discount ESPP with a 6-month lookback.
Federal LTCG, NIIT, and state tax stacked on an RSU or ISO sale.
$10M-or-10× federal exclusion on five-year C-corp stock, with state conformity flag.
Per-quarter after-tax cash on a scheduled trading plan.
Cash outlay and same-day-sale net for a Non-Qualified Stock Option exercise.
22% vs 37% vs your actual marginal rate on a big RSU event.
Secondary-market / tender offer proceeds net of fees and tax.
How much of a prior-year AMT bill comes back this year via Form 8801.
30-year plan stress-tested against a 50% employer-stock drawdown.