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Stock Option Exercise Income Forecast Estimator

Estimate the income you could realize from a stock-option position over a chosen forecast period. The estimator starts with the number of options, strike price, current share price, expected annual share-price growth, and the share of vested options you expect to exercise and sell each year.

The output helps translate an equity award into a simple gross-value forecast before tax. It is most useful for comparing scenarios such as slower versus faster exercises or conservative versus optimistic price growth. Because option terms and tax rules vary, the model focuses on economic spread and does not assume a particular tax classification.

Inputs

options
USD/share
USD/share
%
%
years
Result
—
Forecast gross option spread
Forecast spread value—
Exercise cost used—
Options exercised—
Ending forecast share price—

1. Enter the option quantity
Use the number of options you want included in this forecast, not necessarily your full grant.

2. Add strike and market prices
Enter the exercise price and current share price on a per-share basis.

3. Set price growth
Choose a yearly share-price change for the scenario. Negative growth is allowed as long as it is greater than -100%.

4. Set the annual exercise pace
Enter the percentage of the original option count you expect to exercise and sell each year.

5. Choose the forecast period
Set the number of years to model and review the cumulative gross spread, exercise cost, and ending forecast price.

Forecast price in year t = current price × (1 + growth rate)^t
Options used in year t = min(remaining options, original options × annual exercise percentage)
Gross spread in year t = options used × max(0, forecast price - strike price)

Where:

  • growth rate = assumed annual share-price change as a decimal
  • strike price = exercise price per share
  • gross spread = market value above exercise cost before taxes and fees

Assumptions: The annual exercise percentage is applied to the original option count until no modeled options remain. The forecast excludes taxes, transaction costs, expiration limits, and vesting constraints.

What the result means

This forecast uses a constant annual share-price growth assumption and excludes tax, vesting, expiration, and trading constraints.

Change one assumption at a time to compare scenarios and understand which input has the largest effect on the result.

Given:

  • 5,000 options
  • Strike price: $20
  • Current share price: $45
  • Annual price growth: 6%
  • Exercise/sale pace: 20% per year
  • Forecast: 5 years

Calculation:
Year 1 forecast price is $47.70, giving a $27.70 spread per exercised option. The calculation repeats each year for 1,000 options, using the higher forecast price for later years.

Result:
All 5,000 options are modeled as exercised across five years, producing a cumulative gross spread above the $100,000 total exercise cost.

Interpretation: This is an economic-value forecast before tax; it does not predict actual stock prices or option availability.

Is the main result the cash I will receive?

Not necessarily. The main result is the cumulative value of the share price above the strike price for the modeled exercises. Cash received also depends on how the exercise is funded, sale mechanics, taxes, fees, and withholding.

Why does the tool use the original option count for the annual percentage?

That creates a steady planned exercise amount each year. If the percentage would use more options than remain, the final modeled year uses only the remaining options.

What if the forecast share price falls below the strike price?

The modeled spread for that year is zero rather than negative. An underwater option may still exist, but exercising it would not create positive intrinsic value at that modeled price.

Can I use this for ISOs and nonstatutory options?

You can use it for a pre-tax economic comparison because it does not hard-code a tax method. Actual after-tax outcomes differ by option type and transaction timing.

Does the estimator account for option expiration or vesting?

No. Only include options you reasonably expect to be available during the forecast, and shorten the forecast if the award expires earlier.