Choosing Strikes and Delta for the Wheel
Delta is a shortcut for assignment odds, not a rulebook. Here's how to use it.
Every wheel trade starts with the same decision: which strike do you sell? Delta is the number most traders reach for first, because it doubles as a rough probability the option finishes in the money. That makes it a fast filter — but only a filter. This guide covers what delta actually measures, why a lot of wheel traders converge on roughly the same range, and the situations where leaning on delta alone gets you into trouble.
What delta is actually telling you
Delta measures how much an option's price moves for a $1 move in the underlying. A put with a delta of -0.30 gains roughly $0.30 for every $1 the stock falls. That's the textbook definition, but the number traders actually use it for is different: as an approximation of the probability the option expires in the money. A -0.30 delta put is, loosely, priced as if there's about a 30% chance the stock finishes below the strike at expiration.
That approximation comes from the option pricing model, not from any guarantee about the future. It reflects what the market currently thinks is priced into the option, based on implied volatility and time to expiration — not a verified forecast. Treat it as the market's current best guess, expressed as a number, and nothing more.
Why 0.20-0.35 delta is the common starting range
Most wheel traders who sell cash-secured puts gravitate to somewhere between 0.20 and 0.35 delta. The logic: below about 0.20, the premium collected relative to the capital tied up usually isn't worth the trade — you're accepting a low probability of assignment for a small return. Above about 0.35, assignment becomes frequent enough that you spend most of your time holding stock and writing covered calls rather than collecting premium on puts, which changes the character of the strategy even if it doesn't necessarily change the expected return.
None of this is a rule. It's a range that balances premium collected against how often you actually want to own the stock. If you're wheeling a company you'd be glad to hold for years, a higher delta (and more frequent assignment) might suit you fine. If you're using the wheel purely for premium income and would rather avoid taking ownership, staying under 0.25 keeps assignment less frequent.
Where the shortcut breaks down
Delta is derived from implied volatility, and implied volatility spikes before binary events — earnings, FDA decisions, litigation outcomes — in ways that inflate the delta's usefulness as a probability estimate. A -0.25 delta put sold two days before earnings is not a 25% assignment odds in any dependable sense; the stock can gap past the strike overnight in a way the model didn't anticipate cleanly. Check the earnings calendar before you sell, not after.
Delta also says nothing about liquidity. A far out-of-the-money strike on a thinly traded name can show a textbook-perfect delta and still have a bid-ask spread wide enough to erase the edge the moment you need to close or roll the position. Pair a delta filter with an open interest and volume check — the options liquidity checker on this site does exactly that pairing.
Finally, delta is a point-in-time snapshot. It moves as the stock moves and as expiration approaches (a change captured by gamma, not delta). A put sold at 0.25 delta can drift to 0.60 delta after a bad week for the stock, well before expiration. Choosing a strike isn't a one-time decision if you plan to manage the position actively.
Key takeaways
- Delta approximates assignment probability; it is not a probability guarantee.
- 0.20-0.35 delta is a common starting range, not a rule — the right number depends on whether you want the stock.
- Check earnings dates and liquidity separately; delta accounts for neither.
- Delta changes as the stock moves, so a strike chosen today won't hold its odds for the life of the contract.
Common questions
Is a lower delta always safer?
Lower delta means a lower probability of assignment, which is often what people mean by safer, but it doesn't mean risk-free. A far out-of-the-money put can still lose money on a sharp drop, and it ties up the same collateral for a smaller premium.
Should I use delta or probability of touch?
Delta approximates the odds of finishing in the money at expiration. Probability of touch — sometimes shown by brokers — approximates the odds the stock crosses the strike at any point before expiration, which is a higher number for the same strike. If you plan to hold to expiration rather than exit early, delta is the more relevant of the two.
Does delta change if I sell a covered call instead of a put?
The mechanics are the same — call delta approximates the odds the call finishes in the money and the shares get called away. The same 0.20-0.35 range is a common starting point on the call side too, balancing premium against how often you want to keep the shares.
Other guides
- Reading IV Rank Before You Sell PremiumThe same 40% implied volatility can be cheap or expensive, depending on where it sits in its own range.
- What Happens When You Get AssignedThe mechanics of assignment on a short put or call, and what the wheel does next.
- Cash-Secured Puts vs. Covered Calls: The Two Halves of the WheelSame underlying trade-off, opposite starting position. Here's where each leg actually earns its keep.
- Annualized Yield Is a Comparison Tool, Not a ForecastA 60% annualized return sounds enormous. Here's what the number actually compresses into one figure — and why it isn't a return you should expect to compound.
- Common Wheel Strategy MistakesMost wheel losses trace back to a handful of repeatable errors, not bad luck.
Stop doing this by hand
Wheel Income screens live option chains for cash-secured puts and covered calls, then tracks every cycle from assignment through called away.
Try the screenerFor information and educational purposes only. Not investment advice. Options carry risk, including loss of the entire position.