Stock Option Tax Calculator

Incentive Stock Options (ISOs) and Non-Qualified Stock Options (NSOs) are taxed very differently. NSOs create ordinary income at exercise; ISOs defer tax until sale but may trigger AMT. This calculator walks through both scenarios so you can plan your exercise timing and avoid surprise tax bills.

Option Type

Shares to Exercise

Grant / Strike Price ($)

Current FMV / 409A ($)

Sale Price (if selling now) ($)

Your Marginal Income Tax Rate (%)

Holding Period (after exercise)

Regular Income (for AMT check) ($)

Shares × FMV (market value)

Exercise Cost (shares × strike)

Bargain Element (spread)

Ordinary Income at Exercise

Capital Gain/Loss on Sale

AMT Preference Item (ISO)

Total Estimated Tax

Net After Tax