VEGA FIELD GUIDE · 14 · STRATEGIES
Vertical Spreads: Defined Risk with a Price Target
A vertical spread pairs two options of the same type and expiration at different strikes. The second leg reshapes cost, risk, and upside. It also makes strike selection part of the thesis.
Spread width sets the gross distance between maximum gain and maximum loss.
Debit spreads need the underlying to move through the breakeven; credit spreads earn their best result when the short strike remains safe.
The short leg reduces cost and caps the favorable payoff beyond its strike.
Four common verticals
A bull call spread buys a call and sells a higher-strike call. A bear put spread buys a put and sells a lower-strike put. Both usually open for a debit. Bull put and bear call spreads reverse the ownership of the legs and usually open for a credit.
Every standard vertical has a bounded expiration payoff when both legs remain intact. That tidy diagram can become less tidy if one leg is assigned early or closed by a broker, so position monitoring remains part of the job.
Width, debit, and credit do the arithmetic
For a debit spread, maximum loss is the opening debit. Maximum gain is the strike width minus that debit. For a credit spread, maximum gain is the opening credit and maximum loss is the width minus the credit. Multiply per-share figures by the contract multiplier.
Wider spreads buy a larger payoff range and usually require more capital. Narrower spreads concentrate the outcome around a smaller price interval. Neither choice is universally superior; the expected move and available liquidity should lead.
(short strike - long strike - net debit) x contract multiplierStrike placement expresses the forecast
- Place the long strike near the level where directional exposure should begin.
- Place the short strike near a plausible target where additional upside has less value to the thesis.
- Compare the short strike with the option-implied move and nearby technical levels.
- Check both legs for quoted size, volume, open interest, and spread width.
The payoff diagram is a compact forecast. Its sloped region is the price range where another dollar of movement still changes expiration P&L.
Worked example: 100/110 bull call spread
A stock trades near $100. The 100 call costs $6 and the 110 call can be sold for $2. The net debit is $4, or $400 per spread. The strikes are $10 apart.
Maximum loss is $400. Maximum gain is $600, reached at $110 or higher at expiration. Breakeven is $104. A finish at $107 produces $7 of intrinsic spread value and a $3 net gain per share, or $300.
| Stock at expiration | Spread value | Net P&L |
|---|---|---|
| $98 | $0 | -$400 |
| $104 | $400 | $0 |
| $107 | $700 | +$300 |
| $112 | $1,000 | +$600 |
Check the whole lifecycle
Early assignment risk belongs to the short leg of American-style equity and ETF options. It tends to deserve extra attention when a short call is in the money near an ex-dividend date or when a short option has very little remaining time value.
At expiration, pin risk can leave the stock hovering near a strike while exercise decisions remain uncertain. Closing the spread before expiration can simplify those operational risks, though execution cost may consume part of the remaining value.
Compare strikes and spread widths
Select both legs from the chain and inspect maximum risk, return on risk, and expiration payoff.