How to Choose a Strike Price When Selling Options

The strike price is the single biggest decision in any option-selling trade. It sets how much premium you collect, how likely you are to be assigned, and the price you end up transacting at. This guide is a practical walk through how to pick one for a cash-secured put or a covered call.

What does the strike price decide?#

When you sell an option, the strike is the price at which you have agreed to transact — buy the stock if you sold a put, sell the stock if you sold a call. Three things move together as you slide the strike up or down: the premium you collect, the probability the option finishes in the money, and the price you would be locked into. You cannot maximize all three at once. Choosing a strike is really just choosing where on that trade-off you want to sit.

Start with moneyness#

Moneyness is the strike’s position relative to the current share price.

• An out-of-the-money strike — below the price for a put, above it for a call — collects less premium but is less likely to be assigned. Most option sellers live here.
• An at-the-money strike sits near the current price: the most premium per day, and roughly a coin flip on assignment.
• An in-the-money strike collects the most premium, including real intrinsic value, but is likely to be assigned.

The further out of the money you go, the more you are paying — in forgone premium — for a lower chance of assignment.

How does delta help you pick a strike?#

Every option has a delta, and for an option seller delta carries a handy second meaning: it is a rough estimate of the probability the option finishes in the money. A put with a delta of 0.30 has, very roughly, a 30% chance of being assigned and a 70% chance of expiring worthless.

Many premium sellers pick strikes by delta rather than by dollar distance, commonly somewhere in the 0.15 to 0.30 range. A 0.16-delta strike is conservative — about an 84% chance of expiring worthless, and it sits right around the one-standard-deviation expected move for the expiration. A 0.30-delta strike collects more premium for more assignment risk. Delta is an estimate, not a promise, and it shifts as the stock and its volatility move — but it is a far better guide than eyeballing the dollar gap.

What is probability of profit?#

Probability of profit is close to, but slightly better than, “one minus delta” for a sold option. You keep the whole premium if the option expires worthless, but you are also still profitable if it finishes a little in the money — anywhere within the premium you collected. That premium cushion pushes your real breakeven past the strike. A 0.30-delta cash-secured put might expire worthless about 70% of the time, but the trade is actually profitable a bit more often than that, because the stock can dip slightly below the strike and you still come out ahead.

The premium-versus-safety trade-off#

Every strike choice is the same trade-off in different clothing: a closer strike pays more and risks more, a further strike pays less and risks less. There is no free lunch and no universally correct delta. The richest premiums sit on the strikes — and the stocks — most likely to hurt you. The job is not to find the “best” strike but the one whose risk you are genuinely willing to take.

How do you choose a strike price?#

Put the probability talk aside for a moment and answer one concrete question first.

• For a cash-secured put: at what price would you be genuinely happy to own 100 shares? That price is your strike. Then check its delta — if it implies more assignment risk than you want, move further out.
• For a covered call: at what price would you be genuinely happy to sell your shares? That price is your strike. Sell the call there, ideally at or above your cost basis so an assignment locks in a gain.

Choosing a strike you are comfortable transacting at — and only then tuning it by delta — keeps you clear of the most common mistake: chasing a fat premium at a strike you would hate to be assigned on. It also pays to confirm the strike is actually tradeable - how to tell if an option is liquid covers the quick spread, open-interest and volume checks worth a glance first. Model a few strikes side by side in the Cash-Secured Put Calculator or Covered Call Calculator before you commit.