Vertical spreads
How does Theta decay interact with an ITM debit spread versus an OTM debit spread?
By Easy Money Scanner · Educational reference · Not investment advice
The short answer
An ITM debit spread tends to experience less dramatic theta decay as a percentage of its value since much of its worth is intrinsic, while an OTM debit spread relies more heavily on extrinsic value, which decays more noticeably as expiration approaches without favorable price movement.
How it works
This means OTM debit spreads require the underlying to move favorably within a shorter window to overcome accelerating decay, while ITM spreads depend less on timing since intrinsic value is already established.
An example
An ITM call debit spread may lose relatively little value from one week of sideways trading, while a similarly priced OTM call debit spread can lose a meaningful portion of its value in the same period.
Risk & limitations
OIC notes ITM debit spreads typically cost more upfront, so lower theta risk is offset by higher initial capital commitment.
Examples are hypothetical, not trade recommendations. US contract and regulatory references do not automatically apply in Canada. Rules, margin requirements and broker policies can change; confirm them with the relevant authority and your broker.