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OPTIONS STRATEGIES·BULLISH·2 LEGS

Diagonal spread

Combines a vertical and a calendar spread. Buy a long-dated option at one strike, sell a shorter-dated option at a different strike. Common in poor-man's covered call setups.

INPUTS
Underlying price
$
Centers the payoff chart and computes P&L at this price.
LEGS
Short near-term
Type
Side
Strike
$
Qty
Premium
$
Long far-term
Type
Side
Strike
$
Qty
Premium
$
RESULT
spot $100.00
$60.002 strikes$140.00
P&L at current spot (expiry)
−$250
Net debit−$250
Max profitUnlimited
Max loss−$250
Note: Profit zone depends on stock position at near-term expiration.
RISK PROFILE
Max profit
Variable — depends on stock at near-term expiry
Max loss
Net debit paid (for debit diagonals)
Breakeven
Complex — depends on time and IV
HOW IT WORKS

How a diagonal spread works

A diagonal spread buys a longer-dated option at one strike and sells a shorter-dated option at a different strike. It combines the time-decay edge of a calendar spread with a directional lean from the strike difference — hence "diagonal" rather than vertical or horizontal.

The most common construction buys a longer-dated call closer to the money and sells a shorter-dated call further out. The long leg gives you upside exposure with more time to be right; the short leg reduces the cost and decays faster. If the stock drifts up toward the short strike, both effects work together.

Many traders run it as a repeatable structure: hold the long-dated option and sell a new short-dated one against it each cycle, in the manner of a covered call but with an option standing in for the shares. It requires less capital than owning stock, at the cost of an expiry date on the whole position.

WORKED EXAMPLE

A worked example

XYZ trades at $100 and you are mildly bullish over the next couple of months. You buy the 60-day $100 call for $4.50 per share and sell the 30-day $105 call for $1.50.

Net debit
$4.50 − $1.50 = $3.00 × 100 = $300
Best case at day 30
XYZ just below $105 — short expires worthless, long is deep in the money
If XYZ = $105 at day 30
Short expires at $0; the 30-day $100 call is worth roughly $6.50 → about +$350
If XYZ = $100 at day 30
Short expires worthless; long worth about $3.00 → roughly breakeven
If XYZ ≤ $95 at day 30
Long leg has lost most of its value → approaching −$300

The ideal outcome is a stock that climbs to just below the short strike and stops. A move well past $105 still profits but is capped by the short call until it is rolled — the upside is not open-ended while that leg is live.

FIT

When a diagonal spread fits — and when it doesn't

Consider it when
  • You are mildly bullish over a multi-month horizon and want to reduce the cost of a long call.
  • Short-dated implied volatility is elevated relative to longer-dated, so the leg you sell is the expensive one.
  • You intend to sell against the long leg repeatedly rather than treat it as a single trade.
Think twice when
  • You expect a sharp move up. The short call caps you exactly when the position is working.
  • You cannot monitor it. Diagonals need managing at each short expiry, unlike a single-leg position.
  • Either expiry is illiquid — two legs across two expiries means four crossings and a lot of slippage.
FAQ

Common questions

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

A calendar uses the same strike in both expiries and is a pure time trade. A diagonal uses different strikes, adding a directional view to the time-decay edge.

What is a poor man's covered call?

A diagonal where the long leg is a deep in-the-money, long-dated call standing in for 100 shares, against which you sell shorter-dated calls. It mimics a covered call for far less capital, but the long leg expires and the shares never do.

What is the maximum loss?

Approximately the net debit paid, if the stock falls far enough that the long leg loses most of its value. Unlike a vertical spread the exact figure depends on where the stock sits at the short expiry and on implied volatility.

What happens if the short leg is assigned?

You are short 100 shares, with the long call covering the position. Most traders close or roll the short leg before expiry rather than take assignment, particularly around ex-dividend dates.

RELATED STRATEGIES
Calendar spread
Time decay play · Profits from differential theta.
Bull call spread
Bullish · Debit spread, defined risk and reward.
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