Options Greeks: theta: Answer Guide 2027
Theta measures an option's time decay — how much value the option loses each day as expiration approaches, all else equal. Option buyers pay theta; option sellers collect it. In an options Greeks theta interview question, explain the decay mechanics, when it accelerates, and the theta-gamma trade-off.
Theta Interview Questions: What They Test
The core logic: options are wasting assets — every passing day removes one day of opportunity for the option to finish in the money, so time value erodes. Theta is typically quoted as a negative number for long positions (daily loss) and positive for shorts. Decay accelerates near expiration, especially for at-the-money options where time value is concentrated.
Interviewers want the theta-gamma trade-off, the central economics of options: long gamma (benefiting from moves) costs theta (bleeding daily), while short gamma earns theta but suffers on realized volatility. The interview-ready line: "you pay theta to own gamma." Weekend and holiday decay — time passing without trading — is the classic follow-up detail.
How to Answer a Theta Interview Question
- Define it. "Theta is daily time decay — the value an option loses per day as expiry approaches."
- Say who pays and who earns. "Buyers pay theta; sellers collect it — time decay is the seller's edge."
- Explain the acceleration. "Decay speeds up near expiry, fastest for at-the-money options holding the most time value."
- State the trade-off. "Long gamma costs theta; the question is always whether realized moves pay for the daily bleed."
Common Mistakes in Theta Interview Answers
- Treating decay as linear. Time decay accelerates — straight-lining it to expiry understates near-term bleed.
- Forgetting weekends. Time passes on non-trading days too — theta accrues over weekends and holidays.
- Ignoring the gamma link. Theta in isolation is trivia; the theta-versus-gamma economics is the interview point.
Theta is the cost of optionality made concrete — define it, price the trade-off, and you are done.
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FAQ
Q: What is theta in options? A: The Greek measuring the daily decline in an option's value due to the passage of time, holding other factors constant.
Q: Do option buyers or sellers benefit from theta? A: Sellers collect it and buyers pay it — time decay transfers value from long to short option positions.
Q: When is time decay fastest? A: In the final weeks before expiration, particularly for at-the-money options where time value is largest.
Q: What is the theta-gamma trade-off? A: Owning gamma (benefiting from price moves) requires paying theta (daily decay) — the central cost-benefit of long option positions.
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