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The portion of an option premium above its intrinsic value. Also called time value. Reflects time remaining, implied volatility, rates, and dividends.
⚡ KEY TAKEAWAY: Extrinsic value is what premium sellers harvest. It decays to zero at expiration via theta.

Extrinsic value is the only part of premium that theta decays. It's what premium sellers actually harvest. A deep-ITM option with $20 of premium but only $0.50 of extrinsic offers almost no theta income. Extrinsic value is the true measure of an option's 'sellable' premium.
Extrinsic = Premium − Intrinsic. For OTM options, extrinsic = 100% of premium (intrinsic is zero). For ATM options, extrinsic is maximized. For deep-ITM options, extrinsic approaches zero. Extrinsic value is driven by time remaining, implied volatility, interest rates, and dividends.
AAPL at $200. The $195 put (slightly OTM) trades at $4.20 — all extrinsic. The $210 put (deep ITM) trades at $13.50 with $10 intrinsic — only $3.50 extrinsic. Despite the $210 put having 3x the premium, it has less extrinsic (less theta income) than the $195 put.
Selling deep-ITM options thinking you'll collect more theta because the premium is higher. Theta only decays extrinsic value. A $15 deep-ITM option with $1 extrinsic decays slower than a $5 ATM option with $5 extrinsic.
The portion of an option premium above its intrinsic value. Also called time value. Reflects time remaining, implied volatility, rates, and dividends.
Extrinsic value is what premium sellers harvest. It decays to zero at expiration via theta.
Extrinsic = Premium − Intrinsic. For OTM options, extrinsic = 100% of premium (intrinsic is zero). For ATM options, extrinsic is maximized. For deep-ITM options, extrinsic approaches zero. Extrinsic value is driven by time remaining, implied volatility, interest rates, and dividends.
Selling deep-ITM options thinking you'll collect more theta because the premium is higher. Theta only decays extrinsic value. A $15 deep-ITM option with $1 extrinsic decays slower than a $5 ATM option with $5 extrinsic.