What is theta decay in options?

    Short answer

    Theta decay is the steady loss of an option’s time value as expiration approaches. It is slow when expiry is months away and speeds up sharply in the last 30 days, so option buyers fight the clock while option sellers collect it.

    How decay speeds up

    • Long-dated options lose little value per day.
    • Inside 30–45 days, daily decay grows noticeably.
    • In the final week, at-the-money options can lose a large share of their remaining value each day.

    Managing theta (examples, not advice)

    • Buyers often choose 60+ days to expiry so a thesis has time to play out.
    • Sellers often open 30–45 days out and close early once most of the premium is captured.
    • Weekends count: options decay over calendar days, not only trading days.

    Common questions

    Does theta decay happen on weekends?

    Yes. Pricing models use calendar time, so Friday-to-Monday decay is usually priced in by Friday’s close.

    Which options decay fastest?

    At-the-money options close to expiration.

    Can theta be positive?

    For the seller of an option, yes — they gain as time value disappears.

    Go deeper with Rebel Intel

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    Educational only, not investment advice. Options involve risk and are not suitable for all investors. See how Intel is reviewed.