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Calendar spread vs iron condor: which one for a quiet stock?

Both trades want a quiet stock. Pick the iron condor if you expect implied volatility to fall and want a wide range. Pick the calendar if you expect IV to hold or rise and the stock to sit right on one price.

Comparison · 7-minute read · Updated 2026-11-09

The short answer

Both trades are bets that a stock stays quiet. They disagree about one thing: implied volatility, the market's guess of how much the stock will move.

• An Iron condor sells options. It gains when implied volatility falls. It keeps its full credit across a wide range of prices.
• A calendar spread buys a later option and sells a nearer one. It gains when implied volatility rises or holds. It pays most only in a narrow tent around one price.

So pick the condor when IV looks high and likely to drop. Pick the calendar when IV looks low and the stock should sit right on a strike.

Side by side

One quiet stock, both trades (hypothetical)

Pine Hollow Foods, a made-up stock, trades at $50. Implied volatility is 34%. Both trades are opened the same day.

The iron condor (30 days). Sell the $45 put and the $55 call. Buy the $41 put and the $59 call for protection. Net credit: $0.65, so $65. Max loss: $4 wings × 100 = $400, minus $65 = $335. Break-evens: $44.35 and $55.65.

The calendar (30 and 60 days). Buy the 60-day $50 call for $2.90. Sell the 30-day $50 call for $2.00. Debit: $0.90, so $90. That debit is about the most it can lose.

All values below come from the Black-Scholes model with a 4% interest rate. The calendar's back-month call is priced at whatever IV the row says.

One week in, the stock hasn't moved

That is the vega flip. Same stock, same week, no price move. One trade wins and the other loses, depending only on what IV did. The condor is short Vega. The calendar is long vega.

At the 30-day expiry, IV back at 34%

Look at the $46 and $54 rows. An 8% move is inside the condor's band, so it keeps the full $65. The same move is outside the calendar's tent, which runs from about $47.30 to $53.30, so the calendar loses.

The calendar only beats the condor near $50. It wins that row by a lot, +$112 against +$65.

Then the crash row. A 20% drop takes the condor to its full −$335 loss. The calendar loses about its $90 debit. A small, known loss is the calendar's quiet advantage. The condor risks five times its credit.

Why the vega flip happens

The condor's legs are all short-dated and it is net short options. When IV rises, every option it sold gets pricier to buy back. That's a loss on paper.

The calendar owns a 60-day option and is short a 30-day one. The longer option has more time value, so it reacts more to IV. When IV rises, the call you own gains more than the call you sold. When IV falls, the reverse happens.

This is why opening a calendar right before earnings is a trap. IV is high and about to drop. IV crush vs theta decay shows that drop in dollars.

Which one for your quiet stock?

Both are multi-leg trades, so most brokers require a higher options permission level. In Canada, many brokers don't allow spreads in a TFSA or RRSP at all, so check first.

The iron condor calculator runs your own condor numbers. The calendar spread guide covers the calendar on its own. For every strategy in one table, see the options strategy comparison chart. If four legs feel like too much, the wheel strategy sells one option at a time.

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