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Early Exercise / Assignment Estimator
Screen time value, dividends and interest incentives for an American-style option.
Research ex-dividend dates
Use your model as a starting point, then explore ex-dividend dates on Market Chameleon. Your calculator inputs stay here.
Full screening features may require a paid subscription. Market data is delayed.
About this calculator
How to use this tool
This is a qualitative incentive screen, not a numerical probability of assignment. A short American option can be assigned on any exercise day. Exercise decisions and allocation cannot be predicted from these inputs alone.
An ITM call near an ex-dividend date may attract exercise when the dividend exceeds remaining time value, but financing and other factors also matter. A deep ITM put with little time value can have an interest incentive to exercise.
A flag is not an instruction to exercise. Price minus intrinsic can be unreliable when quotes are stale or wide; use the exercise-versus-sale comparison and your broker’s contract deadlines.
Worked example
An ITM call with $0.20 time value ahead of a $1 dividend triggers a dividend-incentive flag. It does not imply a specific assignment percentage.
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Model references and conventions
365 calendar days per year. Continuous rates for theoretical pricing. All examples are illustrative.
