VEGA FIELD GUIDE · 03 · FOUNDATIONS
Moneyness and the anatomy of option premium
Option prices have a useful split personality. One part reflects immediate exercise value. The other part pays for time, uncertainty, and possibility. Learning the split makes strike comparisons much easier.
A call is in the money when spot is above the strike; a put is in the money when spot is below the strike.
Intrinsic value is the immediate exercise value. Extrinsic value is the premium remaining after intrinsic value.
Extrinsic value responds to time, implied volatility, rates, dividends, and the relationship between spot and strike.
In, at, and out of the money
Moneyness describes the relationship between the underlying price and the strike. A call is in the money when the underlying trades above its strike. A put is in the money when the underlying trades below its strike. A strike close to spot is described as at the money.
Moneyness moves with the underlying. Today's out-of-the-money call can become tomorrow's in-the-money call after a rally. Delta and intrinsic value change along the way.
| Underlying at $100 | Call status | Put status |
|---|---|---|
| $90 strike | In the money | Out of the money |
| $100 strike | At the money | At the money |
| $110 strike | Out of the money | In the money |
Intrinsic value is the sturdy part
A call's intrinsic value is the amount spot exceeds the strike, floored at zero. A put's intrinsic value is the amount the strike exceeds spot, also floored at zero. Intrinsic value cannot be negative.
With XYZ at $108, a 100 call has $8 of intrinsic value. If the call trades at $9.30, the remaining $1.30 is extrinsic value. A 110 call has zero intrinsic value at that moment, so its full premium is extrinsic.
call: max(spot - strike, 0) | put: max(strike - spot, 0)Extrinsic value pays for possibility
Extrinsic value reflects the outcomes that can still arrive before expiration. Additional time generally supports additional extrinsic value because the underlying has longer to move. Higher implied volatility also tends to lift option premiums because a wider distribution places greater weight on large outcomes.
At-the-money options often carry the greatest extrinsic value in dollar terms for a given expiration. Deep in-the-money and far out-of-the-money options tend to carry less. At expiration, extrinsic value reaches zero.
The midpoint between bid and ask can be useful for analysis. Executable prices depend on the live market, order size, order type, and available liquidity.
Break-even is tied to a date
A long 100 call purchased for $4 has an expiration break-even of $104. A long 100 put purchased for $4 has an expiration break-even of $96. Those figures apply at expiration, when extrinsic value has disappeared.
Before expiration, the call can show a profit with the stock below $104 if enough time value or implied volatility remains. The same call can lose value after a favorable stock move if implied volatility falls sharply or time passes. The calculator helps keep these moving pieces on one grid.
long call: strike + premium | long put: strike - premiumCompare strikes with a consistent checklist
- Start with the contract's intrinsic and extrinsic value per share.
- Compare implied volatility across nearby strikes in the same expiration.
- Review delta to understand current directional sensitivity.
- Measure the bid-ask spread as a percentage of the option mid price.
- Model the expected holding date and the expiration date separately.
- Include commissions, contract fees, and a realistic execution assumption.
Compare strikes in the calculator
Select nearby strikes and inspect intrinsic value, break-even, payoff, and pre-expiration behavior.