DocsStrategies

Long Put Calendar

Sell a near-term put, buy the same-strike put further out. Time-decay play using puts.

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A long put calendar is the mirror image of the call calendar: sell a near-term put and buy the same-strike put in a later expiration. You profit from the front-month put decaying faster than the back-month put. Functionally similar to its call counterpart, the put calendar earns its place when put skew, liquidity, or your directional lean makes the put side the better vehicle.

Outlook
Neutral to mildly bearish. Stock near the strike at front expiration.
Legs
2 (short near-term put, long further-dated put)
Max loss
Defined: net debit paid
Max profit
Defined: peaks when stock is at strike at front expiration
IV preference
Moderate to High. Benefits from front-month IV crush.
Best regime
Stable markets, no catalyst before front expiration.

The structure

Both legs share the same strike but live in different expirations. You sell the near-term put (fast theta decay) and buy the further-dated put (slow theta decay). The trade is entered for a net debit.

  • Short leg: sell one put at strike K in the near-term expiration (14-30 DTE typical).
  • Long leg: buy one put at the same strike K in the further-dated expiration (45-90 DTE typical).

The maximum profit occurs when the stock finishes at exactly the strike price at front-month expiration. The short put expires worthless while the long put retains substantial time value.

Worked example

AMZN is at $185. You expect range-bound trading for the next three weeks. The put calendar:

  • Sell the 21 DTE $185 put for $4.50
  • Buy the 56 DTE $185 put for $8.00
  • Net debit: $3.50 ($350 per spread)
  • Max loss: $350 (the debit paid)
  • Max profit: occurs if AMZN is at $185 at front expiration
  • Approximate max profit: $300-$500 depending on back-month IV

If AMZN stays at $185 through front expiration, the short put is worthless and the back-month put is worth roughly $6-$8. Net position value: $6-$8 minus the $3.50 you paid. If AMZN moves sharply in either direction, both puts converge in value and the spread narrows toward zero.

When to use it

  • Put skew favors the calendar. Equity puts tend to carry higher IV than calls (the volatility skew). When this skew is steep and front-month puts are especially rich, the put calendar captures more premium on the short leg relative to the cost of the long leg.
  • Neutral to mildly bearish lean. If you think the stock drifts slightly lower toward the strike, the put calendar benefits. The stock approaching the strike from above is the ideal path.
  • Same conditions as the call calendar. Stable markets, no near-term catalyst, and a front/back IV differential that favors selling the front month. Choose between the call and put version based on where liquidity and skew are most favorable.

How Tradient ranks them

The put calendar scanner mirrors the call calendar scanner. It walks each strike, finds the optimal front/back expiration pair, and prices the spread. Tradient additionally checks the put skew ratio — when front-month put IV is elevated relative to back-month, the scanner flags the calendar as a higher-conviction setup.

Scoring weights are identical to the call calendar: theta differential, bid-ask tightness, and debit relative to back-month value. The put calendar gets a small bonus when put open interest exceeds call open interest at the target strike, since that indicates institutional flow on the put side.

Managing the trade

Close at front expiration

Buy back the short put (if it has residual value) and sell the long put. This locks in the time-value differential. Clean and simple.

Roll the front month

If the stock is near the strike and the setup still looks good, let the front put expire worthless and sell the next cycle’s put at the same strike. Each cycle reduces your net cost in the back-month put.

Target profit: 25-50% of debit

Like the call calendar, take profits when the spread has expanded meaningfully. Don’t hold for the theoretical maximum — it requires the stock to pin exactly at the strike, which rarely happens.

Short put assignment risk
If the stock drops below the strike and the short put goes ITM, you may be assigned 100 shares. Unlike call assignment (which costs shares you might not own), put assignment requires cash to buy the shares. Make sure you have the capital or a plan to exercise the long put to cover. Monitor ITM short puts closely in the final days before expiration.

Common mistakes

  • Assignment risk on the short put. When the short put goes ITM, early assignment is possible at any time. This is less common than call assignment near dividends, but it happens — especially deep ITM near expiration. Have a plan.
  • Choosing puts when calls are more liquid. At-the-money calls and puts usually have similar liquidity, but away from ATM, one side often dominates. Check open interest and bid-ask spreads on both sides before deciding which calendar to trade.
  • Expecting directional profit from a move lower. A big drop is not your friend. If the stock crashes, both puts go deep ITM and converge — the spread collapses. The sweet spot is the stock sitting still at the strike.
  • Overpaying for the spread. Same rule as the call calendar: if the debit exceeds 60% of the back-month put value, the risk/reward is unfavorable.

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