Ratio Spreads and Backspreads
A ratio spread sells more contracts than it buys at a different strike. A backspread does the opposite. Both produce asymmetric payoffs — concave or convex — by breaking the 1:1 leg-quantity convention of vertical spreads.
Every multi-leg structure covered so far uses equal contract quantities on each leg (1 long, 1 short, sometimes 2 short at a single strike for butterflies). Ratio spreads and backspreads break that convention — they use unequal quantities on the long and short sides. The result is an asymmetric payoff that doesn't fit the standard vertical-spread, condor, or straddle shapes.
This article covers the 1×2 call ratio spread, the 1×2 call backspread, their put-side variants, when each fits, and how they're typically used on 0DTE.
The ratio spread
A multi-leg structure with unequal quantities of long and short options at different strikes, same expiration, same type. The standard form is the 1×2 ratio spread: long 1 contract at one strike, short 2 contracts at another strike further OTM. Typically opened for a small credit or near-zero net cost. Profits if the underlying ends near the short strikes; loss is uncapped on the side beyond the short strikes because of the extra short leg.
A standard 1×2 call ratio spread at SPX 5000:
- Long 1 × 5000 call ($7 paid)
- Short 2 × 5005 calls ($4 each, $8 collected)
Net credit per share: $8 − $7 = $1, or $100 credit per spread.
- P&L at spot
- $100
- Max profit (range)
- $598
- Max loss (range)
- -$1,400
- Net credit
- $100
Four regions of the payoff:
- Below 5000: all calls OTM. Position keeps the $1 credit per share. P&L = +$100.
- Between 5000 and 5005: long call gains intrinsic, shorts still OTM. P&L rises linearly.
- At 5005 (the short strike): long worth $5 intrinsic (gain $5 against $7 paid = -$2); shorts at strike (gain $8 collected). Total P&L = -$2 + $8 + $1 entry credit... actually combined: P&L = +$6 per share or +$600 per spread. This is the maximum profit.
- Above 5005: the long is ITM and growing, but the two shorts are also ITM and growing twice as fast (two contracts). The position loses ground.
- Above 5011 (upper break-even): the second short leg's losses overwhelm the long's gains. P&L turns negative and grows without bound as the underlying continues higher.
The "extra" short call is what makes the loss uncapped. Below the short strikes the long defends; at the short strikes the position is at maximum profit; above the short strikes one short is fully covered by the long, but the second short is naked.
The backspread
The mirror image of a ratio spread: more contracts long than short. Standard form is the 1×2 backspread: short 1 contract at one strike, long 2 contracts at another strike further OTM. Typically opened for a small credit or small debit. Profits on large moves in the direction of the long legs. Limited loss between the strikes.
A standard 1×2 call backspread at SPX 5000:
- Short 1 × 5000 call ($7 collected)
- Long 2 × 5010 calls ($2.50 each, $5 paid)
Net credit per share: $7 − $5 = $2, or $200 credit per spread.
- P&L at spot
- $200
- Max profit (range)
- $2,200
- Max loss (range)
- -$800
- Net credit
- $200
Four regions:
- Below 5000: all calls OTM. Position keeps the $2 credit per share. P&L = +$200.
- Between 5000 and 5010: short call gains intrinsic against the trader, longs still OTM. P&L declines from credit toward the trough.
- At 5010 (the long strikes): short worth $10 intrinsic (lose $10 against $7 collected = -$3); longs at strike (lose $5 paid). Combined P&L = -$3 + -$5 + entry credit = roughly... actually P&L = -$8 per share = -$800. This is the maximum loss.
- Above 5018 (upper break-even): the two long legs more than offset the single short. P&L turns positive and grows without bound as the underlying continues higher.
The backspread is essentially a long-vol bet with a partial hedge. The short leg gives back some of the cost of the longs, but the second long leg ensures that a large rally pays substantially more than the modest near-strike loss.
Comparing payoff shapes
The two structures are mirror images in payoff shape:
- Ratio spread: concave payoff. Profits build to a peak near the short strikes, then collapse and grow into uncapped losses beyond. The position's gamma flips sign — long gamma at and below the long strike, short gamma above the short strikes.
- Backspread: convex payoff. Small profit zone below the short strike, a trough of maximum loss near the long strikes, then unbounded profit on continued moves in the long-leg direction.
The ratio spread benefits from a modest favorable move (toward the short strikes) but suffers from large moves beyond. The backspread loses on modest moves but pays off big on large moves. They're tools for very different views of how the underlying will move.
Put-side variants
The same structures work on the put side. A 1×2 put ratio spread:
- Long 1 × 5000 put + short 2 × 4995 puts
Profits if SPX ends near 4995. Uncapped loss on a large drop (the extra short put is naked on the downside).
A 1×2 put backspread:
- Short 1 × 5000 put + long 2 × 4990 puts
Profits on large drops (the extra long put). Small loss zone between the strikes.
The choice of call-side vs put-side is about directional bias — the ratio spread expresses "I think the move will be modestly in this direction"; the backspread expresses "I think the move could be sharply in this direction."
When ratio spreads fit
Ratio spreads have a specific risk profile that fits limited situations:
Pinning views with directional bias. A call ratio spread profits maximally if the underlying lands near the short strikes — similar to a butterfly but with a different payoff geometry. If the trader has a strong view that the underlying will close near a particular level but not move past it, the ratio spread can collect more credit than a butterfly while taking on uncapped risk on the unfavorable side.
Skewed range bets. If the trader is confident the underlying will stay below (or above) a particular level — and is willing to take uncapped risk on the side they think is unlikely — a ratio spread collects more premium than a credit spread with bounded risk.
Volatility-selling with directional bias. A ratio spread is essentially a credit spread plus a naked short option at the same strike as the spread's short leg. It's a more aggressive premium-selling structure that combines defined-risk and naked-risk elements.
When backspreads fit
Backspreads also have a specific use case:
Large-move bets with partial hedge. A trader who expects a sharp move in a particular direction but wants to reduce the cost of long premium can use a backspread: the short leg subsidizes the cost of the longs. The trade is less expensive than buying two naked long options outright.
Vol-expansion bets with directional bias. Long extra option exposure benefits from IV expansion. Combined with a directional view, the backspread captures both delta and vega exposure on the favorable side.
Asymmetric tail bets. When the trader expects a meaningfully larger move than IV is pricing — and specifically expects it in one direction — the backspread concentrates the exposure on the rare-but-large outcome side, with limited downside from a routine quiet day.
0DTE considerations
Both structures are tradeable on 0DTE, but with caveats. Ratio spreads on 0DTE have the same gamma-trap exposure as any uncapped-loss structure — the extra short leg becomes increasingly dangerous as expiration approaches if the underlying moves toward the short strikes. Backspreads on 0DTE pay off only on large intraday moves, which are possible on catalyst days but unlikely on routine sessions.
For most retail traders, these structures are less common on 0DTE than the symmetric-quantity ones. Ratio spreads see use among traders comfortable with naked short exposure who want more credit than a defined-risk structure offers. Backspreads see use as cheap directional bets when the trader thinks a sharp move is coming but doesn't want to pay full long-premium prices.
Key takeaways
- A ratio spread uses unequal quantities — typically 1×2: long 1 contract, short 2 contracts at a different strike. Profits if the underlying ends near the short strikes; uncapped loss beyond the short strikes from the extra short leg.
- A backspread is the mirror: short 1, long 2. Profits on large moves toward the long strikes; small max loss between the strikes.
- The two structures have opposite payoff shapes — ratio spread is concave (peak then collapse), backspread is convex (trough then unbounded gain).
- Put-side variants work the same way mirrored to the downside. Choose call-side or put-side based on directional bias.
- For SPX 0DTE specifically, both structures see less retail use than symmetric-quantity ones. Ratio spreads have naked-short tail risk; backspreads need a large intraday move to pay off. Both have legitimate uses for traders with specific asymmetric views.