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# Vertical vs Calendar Spreads: When Each One Fits
- URL: https://www.constellationstocks.com/blog/vertical-vs-calendar-spread/
- Published: 2026-10-22T22:51:49.000Z
- Updated: 2026-11-07T05:06:38.000Z
- Description: A vertical fits a slow move to a target. A calendar lowers the rent on a long option. Two real trades, TMUS and MMM, show when each one fits.
- Author: Iskan Rakhmatov
- Tags: Options, Structures

A vertical spread and a calendar spread both pair a long option with a short one. A vertical uses two strikes in the same expiration. A calendar uses one strike in two expirations. Pick the vertical when you expect the stock to reach your target slowly, close to expiration. Pick the calendar to lower the rent on a long option, the time value it loses every day: the short, near-term option decays faster and pays part of that rent, whether the move comes fast or slow.

*New to options? Start with* [*Options Trading for Beginners: The Complete Guide*](https://www.constellationstocks.com/blog/options-trading-for-beginners/)*.*

## Key takeaways

- **Vertical:** same expiration, two strikes. Cheaper than a single option, but the profit is capped at the short strike. Best when the stock moves to the target slowly.
- **Calendar:** same strike, two expirations. The near-term short option pays part of the rent on the long one, so time decay works for you.
- **Contracts per leg:** a vertical has the same number on both legs. A calendar has 2 to 3 times fewer short options than long ones, depending on conviction.
- **Speed matters for the vertical.** If the stock reaches the target fast, the short option still holds time value, and the full payoff only comes near expiration. A calendar with a small short leg works at either speed.
- **You can switch.** My TMUS trade started as a calendar and ended as a vertical. Both short legs paid; the long put alone lost money.
- **Cover only part of the position.** On MMM, a short leg on 12 of 44 calls cost me $4.75 a share on those 12, or $5,711\. Covering all 44 would have taken about three quarters of the profit.

## Vertical vs calendar spread: the difference

I use both only for directional trades: a bet that the stock goes up or down.

|                | Vertical spread                                                               | Calendar spread                                                    |
| -------------- | ----------------------------------------------------------------------------- | ------------------------------------------------------------------ |
| Strikes        | Two different strikes                                                         | One strike                                                         |
| Expirations    | One expiration                                                                | Two: short near-term, long further out                             |
| Main bet       | The stock reaches the target by expiration, ideally slowly                    | The stock moves your way while the short leg pays the rent         |
| Best case      | Stock reaches the short strike near expiration                                | Short option expires worthless, then the stock moves               |
| Maximum profit | Width between strikes, minus the cost                                         | Not fixed; depends on what the long option is worth later          |
| Maximum loss   | The net cost                                                                  | The net cost                                                       |
| Time decay     | Mostly cancels out between the legs                                           | Lowers your rent: the short leg decays faster                      |
| Contracts      | Same number on both legs                                                      | Fewer short than long, typically 2 to 3 times fewer                |
| Biggest risk   | Wrong direction, or a fast move that leaves the payoff waiting for expiration | Wrong direction; a sharp early move makes the short leg cost money |

Both are debit spreads when you open them this way: you pay to enter, and the most you can lose is what you paid. For how the strike and expiration choices fit into a full trade plan, see [How to Structure an Options Trade](https://www.constellationstocks.com/blog/how-to-structure-an-options-trade/).

## How I choose between them

The choice mostly depends on my view of how the stock price will change. Three inputs shape that view:

- **Target price:** where I expect the stock to go. It sets the strikes.
- **Catalyst horizon:** when the event that should move the stock is due. It sets the expirations.
- **Current stock price:** how far the stock is from the target. It shows how big a move the trade needs, and what each structure costs.

For how I set the target and the catalyst, see [How to Analyze a Stock for Options](https://www.constellationstocks.com/blog/how-to-analyze-a-stock-for-options/).

## When a vertical spread fits

A vertical fits when you have a price target and expect the stock to get there slowly, close to expiration. You buy an option at one strike and sell another option further out, in the same expiration, with the same number of contracts on both legs. The short option lowers the cost. In exchange, you give up any gain past the short strike.

The rule I use: put the short strike at or beyond the price target. If the stock goes where you think it will, the cap costs you nothing.

Speed matters here. If the stock reaches the target fast, the delta of the long option rises sharply, but the short option still holds time value. The spread's value stays below its maximum, and the full payoff is locked in until expiration, when the time value of both legs is gone. Until then, closing early means taking less.

## When a calendar spread fits

A calendar fits when you want to hold a long option and lower its rent: the time value it loses every day. You buy an option with a later expiration and sell fewer options with an earlier expiration, at the same strike. The short options decay faster and pay part of that rent. If the stock moves slowly, they expire worthless and you keep the premium. If it moves fast, the long leg is bigger than the short leg, so the position still gains.

A fast move still has a cost. The short options gain value at the same time as the long ones and take part of the profit. That is why I do not sell a short option against every long one. For a meaningful payoff, the short leg typically has 2 to 3 times fewer contracts than the long leg. The exact ratio depends on my conviction.

## Real trade 1: TMUS, a calendar that became a vertical

**The thesis.** I was bearish on T-Mobile, with a price target of $155\. I expected fewer new postpaid accounts in 2026 than in 2025, higher churn, and falling prepaid revenue. Competitors push fiber internet, which is faster than T-Mobile's 5G home internet. The stock traded at a premium to the other two operators, Verizon and AT&T, about 18 times forward earnings and twice Verizon's multiple. In my opinion that premium was not justified, given lower margins and slowing growth. The whole industry was also under pressure after SpaceX started buying spectrum for its own carrier service.

**Stage 1, July 24: the calendar.**

- Bought 12 October $170 puts at $6.90.
- Sold 6 September $170 puts at $5.30.

The long puts cost $8,280 and the short puts brought in $3,180, for a net cost of $5,100\. That cut the cost of each October put from $6.90 to $4.25\. I sold only 6, against 12 long puts, on purpose. If TMUS fell fast before September expiry, the short puts would gain value too and cap my profit. With half the position uncovered, a fast drop still paid in full on 6 puts.

The stock did not fall fast. On September 2 the September puts were nearly worthless and I bought them back at $0.30\. I kept $5.00 of the $5.30 premium.

**Stage 2, September 17: the vertical.**

- Sold 12 October $155 puts at about $1.57.

The first short leg had done its job. The stock had not reached my target yet, so I collected a second premium while waiting. The short strike, $155, sat at my target, so a drop all the way to the target would not be capped.

**The close, September 28.** I sold the October $170 puts at about $6.17 and bought the $155 puts back at about $0.89.

| Leg                | Contracts | Opened | Closed | Result per share | Result after fees |
| ------------------ | --------- | ------ | ------ | ---------------- | ----------------- |
| Long Oct $170 put  | 12        | $6.90  | $6.17  | −$0.73           | −$881             |
| Short Sep $170 put | 6         | $5.30  | $0.30  | +$5.00           | +$2,994           |
| Short Oct $155 put | 12        | $1.57  | $0.89  | +$0.68           | +$806             |
| **Total**          |           |        |        |                  | **+$2,919**       |

The trade made $2,919 after fees, about $2.45 a share per long put. On the $5,100 net cost that is a gain of about 57%, in nine weeks.

The honest part: the long put lost money. The stock had not reached my target. All of the profit came from the two short legs. Without them, the same thesis would have closed at a loss.

## Real trade 2: MMM, a calendar on a fast move

**The thesis.** I was bullish on 3M as a turnaround, with a price target of $210\. Every segment was growing, organic growth sped up in 2025, guidance went up on every line, margins were rising, and new product launches were ahead of plan.

**The trade.**

- January 22: bought 24 April $165 calls at $4.40 and sold 12 February $165 calls at $1.25\. A calendar with 1 short call for every 2 long ones.
- February 3: bought 10 more April calls at $3.60, without a short leg.
- February 4: bought 10 more at $6.25, also without a short leg.

That made 44 long calls at an average of about $4.64, against 12 short calls, about 4 to 1\. The long calls cost $20,430 and the short calls brought in $1,494, for a net cost of $18,936\. That cut the average cost of each long call to about $4.30.

This time the stock moved fast. On February 9, less than three weeks after opening and before the February calls expired, I closed everything:

- Sold the April calls at about $10.58: a gain of $5.94 a share on 44 calls, or $26,103.
- Bought the February calls back at $6.00: a loss of $4.75 a share on 12 calls, or $5,711.

The trade made $20,392 after fees, about 108% on the net cost. The short leg cost me money, but only on 12 calls. If I had sold 44 February calls, one against each long call, the short leg would have lost $4.75 on all 44, and the loss on that leg would have been about $20,900 instead of $5,711\. The profit would have been about $5,200 instead of $20,392.

## What the two trades show

- **A calendar works at either speed.** On TMUS the stock moved slowly and the short leg paid in full. On MMM it moved fast. The short leg cost money, but the bigger long leg still more than doubled the net cost.
- **Partial coverage is the protection.** Selling short options on part of the position keeps most of the upside if the move comes early.
- **A calendar can turn into a vertical.** Once the near-term premium is collected and the target is still ahead, a further-out short strike adds a second premium without capping the target.
- **Short legs can carry a trade.** On TMUS the thesis had not played out by the close, and the premiums still made it a winner.

## FAQ

### Is a calendar spread better than a vertical spread?

Neither is better in general. The choice depends on your target price, the catalyst horizon and the current stock price. A vertical fits a slow move to a price target, close to expiration. A calendar lowers the cost of holding a long option and works whether the move is fast or slow, as long as the short leg is smaller than the long one.

### What is the max loss on a calendar spread?

For a long calendar, the net premium you paid. With the same number of contracts on both legs, you lose most of it if the stock moves far from the strike in either direction, because the two options end up worth about the same. With fewer short options than long ones, as I trade it, a big move in your direction makes money on the extra long options. The loss then comes only from a move the wrong way.

### What is the difference between a calendar and a diagonal spread?

A calendar uses the same strike in both expirations. A diagonal uses different strikes and different expirations. I used a diagonal on ODFL in August: long October $200 puts, short September $190 puts. I cover diagonals with real trades in [How to Match an Options Structure to a Catalyst](https://www.constellationstocks.com/blog/diagonal-spread/).

### What happens to a calendar spread at the short expiration?

If the short option expires out of the money, it disappears and you keep the premium, and the long option stays open. If it is in the money, close or roll it before expiry to avoid assignment. See [What Happens When an Option Expires](https://www.constellationstocks.com/blog/what-happens-when-an-option-expires/).

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If you want to see how I choose the stock, the structure and the strike for a trade like this, [book a free walkthrough of the Method](https://www.constellationstocks.com/consultation/).

*This post is educational and is not investment advice. Options involve substantial risk and are not suitable for every investor.*