What Strike Price and Expiration Should I Use for the Wheel?
You have picked your stock. You have decided to sell a put. Now comes the part where most beginners either overthink it or just pick a random number and hope for the best.
There is a better way.
Two numbers drive most of the decision: delta (how far out of the money your strike is) and DTE (how many days until the option expires). Get a feel for these and choosing a strike stops feeling like guessing.
Delta: your probability shortcut
Delta on a put option gives you a rough probability that the option expires in the money. A 30 delta put has roughly a 30% chance of ending up ITM, meaning you have about a 70% chance of it expiring worthless and keeping the full premium.
Most experienced wheel traders target around 30 delta for their puts. That is not a rule carved in stone. It is a reasonable balance between collecting meaningful premium and keeping the odds in your favor.
Go lower delta (further OTM) and you are safer but collecting less. Go higher delta (closer to the money) and you are collecting more but more likely to get assigned.
Strike comparison: SPY at $512, 35 DTE
Here is a realistic look at how premium and probability shift as you move between strikes. All figures assume SPY trading at $512 with 35 days to expiration:
| Strike | Distance from Price | Delta | Premium (per share) | Premium (per contract) | Probability OTM |
|---|---|---|---|---|---|
| $505 | 1.4% OTM | 0.37 | $5.60 | $560 | ~63% |
| $500 | 2.3% OTM | 0.28 | $3.75 | $375 | ~72% |
| $495 | 3.3% OTM | 0.20 | $2.30 | $230 | ~80% |
| $488 | 4.7% OTM | 0.12 | $1.20 | $120 | ~88% |
The $500 strike at 0.28 delta is closest to the 30 delta sweet spot. You collect $375 per contract and the market is giving you roughly 72% odds of keeping all of it. The $505 strike pays more but you are accepting a much higher chance of assignment. The $488 strike is very safe but $120 in premium per contract may not be worth tying up $48,800 in buying power for 35 days.
DTE: where theta decay does its best work
Options lose their time value as expiration approaches. That is theta decay, and as the seller of the put, it is working for you. The question is which part of the timeline decays fastest.
The answer is the last 30 to 45 days. Options in the 30 to 45 DTE window experience the sharpest theta decay relative to the time remaining. That is why most wheel traders sell puts with roughly 30 to 45 days until expiration.
Beyond 45 DTE, you are collecting premium but theta is moving slowly. Under 30 DTE, you are getting faster decay but you have less time to react if the stock moves against you. The 30 to 45 day range is where most traders settle in and stay.
One thing to keep in mind
These are guidelines, not formulas. High IV environments mean richer premiums even at lower delta. Low IV environments might push you closer to the money just to collect anything worthwhile.
Watch the actual dollar premium you are collecting and make sure it justifies the buying power you are tying up for the duration of the trade.