OptionsAhoy

Seven deterministic calculators for US equity-compensation planning: ISO/AMT exercise scheduling, NSO sell-vs-hold, RSU sell-vs-hold, QSBS qualification, single-stock concentration analysis, protective put pricing, and selling equity to hit a cash target. Results are computed against the full federal tax code plus all 50 states and DC, so you get verifiable numbers instead of estimates. Free, no account needed. A planning calculator, not tax advice.