How can I predict what I will pay in taxes in 2019 if I plan to exercise ISOs this year?

[KiaraE]

You can utilize the link below, however it is needed to be noted that with ISOs, your taxes depend on the dates of the transactions (that is, when you exercise the options to buy the stock and when you sell the stock). The price break between the grant price you pay and the fair market value on the day you exercise the options to buy the stock is known as the bargain element.

https://turbotax.intuit.com/tax-tools/calculators/taxcaster/