# Ratio Put Spread: Low-Cost Decline Exposure with Deep-Downside Risk

Understand a 1-by-2 ratio put spread, calculate its peak profit and lower breakeven, and manage severe downside, margin, assignment, and execution risk.

Canonical: https://wiki.fcontext.com/options/ratio-put-spread/
Fact checked: 2026-07-22

> For educational purposes only; not investment advice.

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## Direct answer

This article defines a **1-by-2 ratio put spread** as buying one put at higher strike `K_H` and selling two puts at lower strike `K_L`, with one expiration and `K_H > K_L`. The long put offsets only one short put. Below `K_L`, the package retains the downside economics of one net short put.

The second sale can reduce the debit or create an entry credit. In exchange, the strategy targets a moderate decline toward `K_L`, not a crash. Profit peaks at the lower strike and then falls as the underlying declines further. For an ordinary equity bounded by zero, the loss is large but finite.

Ratio-spread names vary. The opposite quantity relationship, usually called a put ratio backspread, has a very different downside tail. Signed quantities matter more than the label.

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## Piecewise expiration payoff

Let `C` be net credit per share; use negative `C` for a debit. Expiration profit per share is:

`Π(S_T) = max(K_H−S_T,0) − 2max(K_L−S_T,0) + C`

- `S_T ≥ K_H`: every put expires worthless; profit is `C`.
- `K_L ≤ S_T < K_H`: only the long put has intrinsic value; profit rises as price falls, reaching `K_H − K_L + C`.
- `S_T < K_L`: profit is `K_H − 2K_L + S_T + C`; every further dollar of decline reduces profit by one dollar.
- The lower breakeven is `2K_L − K_H − C`.

Maximum expiration profit occurs at `K_L`. If the underlying cannot fall below zero, maximum loss at zero is `2K_L − K_H − C` per share when this value is positive. Before expiration, net Greeks depend on spot and volatility skew; after the price crosses the short strike, the position can become positive Delta and negative Gamma, losing from further decline.

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## A 100/95 one-by-two ratio spread

With the stock near `100`, buy one `100` put, sell two `95` puts, and receive a `1.00` net credit. With a 100-share multiplier and before fees:

| Stock at expiration | Option payoff per share | Profit/loss per share | Position profit/loss |
| ---: | ---: | ---: | ---: |
| `105` or `100` | `0` | `1` | `+$100` |
| `96` | `4` | `5` | `+$500` |
| `95` | `5` | `6` | `+$600` |
| `90` | `0` | `1` | `+$100` |
| `89` | `−1` | `0` | `$0` |
| `80` | `−10` | `−9` | `−$900` |
| `0` | `−90` | `−89` | `−$8,900` |

Maximum profit is `$600` at `95`, and the lower breakeven is `89`. Below `89`, every further `$1` decline creates another `$100` loss for the package. At zero, maximum loss is `$8,900`. The `$100` entry credit is therefore not a measure of economic risk.

For a debit entry, substitute negative `C`: profit above `K_H` becomes the debit loss, peak profit falls, the lower breakeven moves higher, and zero-price loss increases. Use the actual combination fill.

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## Risk and implementation checklist

- Verify `+1/−2` quantities, one expiration, multiplier, and debit or credit. Reversing the ratio reverses the crash tail.
- Calculate the lower breakeven and zero-price loss; do not stop the risk graph at the short strike.
- Reserve buying power and cash for one or both short puts. Margin is collateral policy, not maximum loss.
- Use a multi-leg limit order. Partial fills can leave two uncovered short puts or another unintended position.
- American-style short puts can be assigned before expiration, creating stock even while the long put remains open.
- Assignment of one leg does not automatically exercise the long put or close the other short. Manage each resulting position explicitly.
- Plan pin and expiration risk at `K_L`, where either, both, or neither short may be assigned depending on exercise decisions.
- Buying another lower-strike put can cap the deep-downside loss, but creates a different four-leg structure and changes premium and breakevens.

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## Common misconceptions

- “One long put covers two short puts.” It offsets only one; one net short put remains below `K_L`.
- “A credit entry means no loss.” A deep decline can consume far more than the initial credit.
- “It benefits from any decline.” Profit peaks at `K_L`; a larger decline eventually creates a loss.
- “Maximum loss is the strike width.” That describes a 1:1 vertical, not this 1:2 ratio.
- “The short strike is the breakeven.” It is the peak-profit point; the breakeven is lower and depends on premium.
- “The downside loss is unlimited.” For ordinary stock it is bounded by zero, though still potentially severe.
- “It is the same as a put ratio backspread.” A backspread normally owns more puts than it sells and has the opposite crash exposure.

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## Related topics

- [Bear Put Spread](/options/bear-put-spread/)
- [Put Ratio Backspread](/options/put-ratio-backspread/)
- [Put Ladder](/options/put-ladder/)
- [Assignment Risk](/options/assignment-risk/)

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## Authoritative sources

- [Characteristics and Risks of Standardized Options](https://www.theocc.com/company-information/documents-and-archives/options-disclosure-document) - Options Clearing Corporation
- [Regulatory Notice 22-08: Complex Products and Options](https://www.finra.org/rules-guidance/notices/22-08) - FINRA
- [Trading Options: Understanding Assignment](https://www.finra.org/investors/insights/trading-options-understanding-assignment) - FINRA
- [Spread Strategies](https://www.cboe.com/optionsinstitute/courses/spread-strategies/) - Cboe Options Institute