Spread vs single leg: when to use which

The closing question of the chapter

You've learned four vertical spreads, their math, their breakevens, when to use each, and how to defend them. The final question of this chapter: when should you skip the spread entirely and just trade a single option? Singles and spreads each have a place. Picking the wrong tool for a setup is one of the more expensive habits a new options trader picks up.

Single long call or long put — the unhedged trade. You pay full premium. If the stock moves your way HARD, your upside is uncapped. If it stalls or reverses, you lose the full premium. High convexity, high cost, high time-decay exposure. Best for high-conviction directional moves with significant expected magnitude — earnings surprises, breakout catalysts, momentum continuations where you genuinely expect a 10%+ move in days.

Vertical spread — the capped, cheaper trade. You pay less (or even collect credit). Your upside is capped at the spread width minus debit (or the credit itself). Your downside is also capped. Lower cost means lower time decay AND lower volatility exposure — the short leg offsets the long leg's Greeks. Best for moderate directional views, range-bound expectations, or when you want defined risk regardless of how badly you might be wrong.

The simple decision rule: how big do you expect the move? If you expect a tail event — a giant rip — go single leg, accept the higher cost, and capture the unlimited upside. If you expect a normal move, go spread, save the premium, and accept the cap. The mistake to avoid: using a single leg because 'unlimited upside sounds better' when you actually only expect a 3% move. You're paying for upside you won't get.

Recap: single leg = uncapped upside, full premium, best for tail events. Vertical spread = capped upside, lower cost, defined risk, best for normal moves and small accounts. Match the tool to the move you actually expect.