A calendar spread (or time spread) sells a near-dated option and buys a longer-dated option at the same strike. Because the near option decays faster (theta accelerates near expiration), the position profits as the short option loses value quicker than the long one — if the underlying stays near the strike.
How it profits
The ideal outcome: the stock sits near the strike as the near-dated option expires worthless, while your longer-dated option retains most of its value. You pocket the difference in decay. It's a bet on low movement combined with the passage of time — a neutral strategy that wants price to stay put.
Why volatility is the key variable
Calendars are long vega — the longer-dated option you own is sensitive to implied volatility. Rising IV helps the position; falling IV (or an IV crush) hurts it. So you're really making two bets: price stays near the strike, and volatility doesn't collapse. Get the IV read wrong and a "neutral" calendar loses even if price behaves.
A calendar spread is a bet on stillness — in price and in volatility. Both have to cooperate.
The honest view
Calendars are more complex than verticals — you're managing decay and vega across two expirations, with a profit tent that's widest at the strike and loses if price runs either way. Powerful for a specific neutral-with-a-vol-view thesis; easy to misjudge if you ignore the volatility side.
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NoVo is a software tool for market analysis, not financial advice. This article is general education, not investment advice. Options trading involves substantial risk of loss, up to and including your entire capital. NoVo makes no guarantee of profit, win rate, or performance, and past results do not predict future outcomes. You are responsible for your own broker account, configuration, and trading decisions.
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