999 Baker Way Suite 400 San Mateo, CA 94404
+1 (650) 262-6670

Iso Exercise Calculator

Iso Exercise Calculator

How To Understand An ISO Exercise Calculator

If the words “ISO exercise calculator” are enough to make your eyes start to glaze over, you are not alone and we are here to help you simplify matters. Let's say that your employer has provided you with incentive stock options and you wish to make a purchase through the plan that has been provided.

Not only are you going to have pay money to the company that offers the options in the first place, you are also likely to be subjected to alternative minimum taxes. These taxes are determined by the difference between market price when the option is exercised and the original strike price.

What Do You Need To Know To Use an ISO Exercise Calculator?

    The ISO exercise calculator is used to successfully determine the number of stocks that you are going to sell once you have purchase the incentive stock options in question. This is the best way to steer clear of out of pocket expenses. Alternative minimum taxes and regular taxes on these sales are also avoided. Let's say that an employee has decided to purchase stocks through their incentive stock option. There is no income tax owed on the difference between the market price that is set on the day of the actual purchase and the original strike price. This is designed to make the purchasing process much easier for employees who seek opportunities to bolster their income. When it comes to the aforementioned spread, the difference between the two will be used in order to calculate any alternative minimum tax that you may owe. This difference is considered income for these purposes and this is a crucial factor in determining your taxation rate. The rules that are currently in place make it so that any purchase of a reasonable size that is made through an incentive stock option is likely to trigger alternative minimum taxes. If the stocks are sold during the same year in which they are originally purchased, then they will be taxed as normal income and you will not be subjected to any sort of additional taxes that cause alternative minimum tax related consequences. The ISO exercise calculator is not going to be able to calculate your alternative minimum taxes and should not ever be used for such purposes. The calculator has already assumed that you are going to be paying the alternative minimum tax that is placed on the spread of all stock options that you have kept. For the vast majority of tax payers, this assumption is overly pessimistic.

Last, but certainly not least, a closer look at the glossary terms involved with these calculations….

Important Glossary Terms

AMT Tax Rate

This is the current rate that is being used to calculate alternative minimum tax.

Strike Price

When the stock is sold after the conclusion of the holding period.

Market Price

The price of the stock on the open market on the exact day in which it is purchased and the price at which it ends up being sold.

Options Purchased

The number of shares that the employee is purchasing.

Regular Tax Rate

The rate at which your income is typically taxed.


Iso Exercise Calculator
Employee Stock Option Fund
(650) 262-6670
999 Baker Way Suite 400, San Mateo, CA 94404

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