How to choose a covered call strike
Last updated: May 30, 2026 · Covered Calls series
Strike selection is the single most important decision you make as a covered-call seller. It controls three things at once: how much premium you collect, how likely you are to be called away, and how much upside you give up if the stock rallies. Get this right and the strategy works. Get it wrong and you'll either earn nothing or constantly lose your shares at bad prices.
After twenty years of doing this, I can tell you that everyone overcomplicates strike selection. There's really only one heuristic you need: delta. Pick your delta first, then look at which strike that maps to. The rest is just refinement.
Delta in 60 seconds
Delta is a number between 0 and 1 (for calls). It tells you two things at once:
- How much the option price moves when the stock moves $1. A 0.30 delta call gains $0.30 if the stock rises $1.
- Roughly the probability the option expires in-the-money. A 0.30 delta call has about a 30% chance of being ITM at expiration.
For covered-call sellers, the second meaning is what matters. If you sell a 0.30 delta call, there's roughly a 30% chance the stock closes above your strike at expiration and your shares are called away. Or said the other way: there's a 70% chance the call expires worthless and you keep the premium plus the shares.
The three covered-call profiles
I sort every covered call I sell into one of three buckets:
Conservative — 0.15 to 0.20 delta
You really don't want to be called away. The premium is small (maybe 0.5–1% of the underlying), but the call has ~80%+ probability of expiring worthless. Use this when you have a long-term position you intend to hold, and you're just trying to add a little income without disrupting the holding.
SPY at $756. You sell a 30-DTE $785 call (about 0.18 delta) for $4.20. Annualized yield: about 6.7%. If SPY ends below $785 at expiration (very likely), you keep SPY and the $420.
Balanced — 0.25 to 0.35 delta
This is the sweet spot for most income sellers. Premium is meaningful (1.5–3% per 30-day cycle). Assignment probability is 25–35% — high enough to take seriously, low enough that most cycles end with you keeping the shares.
AAPL at $190. You sell a 30-DTE $195 call (about 0.30 delta) for $3.20. Annualized yield: ~20.5%. About a 70% chance the trade ends with you keeping AAPL and the $320; about a 30% chance your shares are called away at $195 and you also keep the premium.
Aggressive — 0.40+ delta
You'd be happy to exit at the strike. Premium is rich (3–5%+ per cycle) but you'll be called away on roughly half of trades. Use this when you want to wind down a position gradually, or when you're confident the stock is range-bound.
NVDA at $212. You sell a 30-DTE $215 call (about 0.45 delta) for $7.50. Annualized yield: ~43%. About a 45% chance of being called away — but in that case you sell at $215 and collected $750 premium, which is a perfectly fine outcome.
How to actually pick the delta
Two questions decide it:
1. Do you want to keep the shares?
- Yes — strongly: 0.15–0.20 delta.
- Yes, but I'd accept being called away at a small profit: 0.25–0.35 delta.
- I'd be happy either way: 0.35–0.45 delta.
2. What's your view of the stock over the next 30 days?
- Mildly bullish or neutral: 0.25–0.30 delta. Standard income setup.
- Bullish: lower delta (0.15–0.20). Don't cap your upside.
- Bearish or expecting a pullback: don't sell a covered call — the premium won't compensate you for the underlying loss.
I almost always default to 0.25–0.30 delta when I don't have a strong view either way. Roughly 70% of those trades end with the call expiring worthless, which is exactly the rhythm I want for a steady income strategy.
What about the expiration?
Strike and expiration interact. For the same delta, a shorter-dated option has a higher strike than a longer-dated one. The trade-off:
- 7-DTE weekly calls: highest theta per day, but high gamma. A small move against you can blow through your strike fast.
- 21–35 DTE monthly calls: the income-seller sweet spot. Good theta, manageable gamma.
- 45+ DTE: lower theta per day but fewer decisions to make. Tax-friendly for some traders.
If you're starting out, default to monthly (the third Friday of the next month) at 0.30 delta. That's the standard institutional buy-write setup for a reason — it works.
FAQ
What's the safest covered call strike?
Far out-of-the-money strikes (delta below 0.20) have the lowest assignment probability. The trade-off is much smaller premium. If safety is your top priority, target 0.15–0.20 delta.
Should I always sell the same delta every time?
Most experienced sellers default to one delta (often 0.30) for consistency, then adjust based on their view of the underlying. A consistent delta makes performance comparable across months.
What if there's no strike at exactly the delta I want?
Pick the closest available. Most US-listed options have strike intervals of $1, $2.50, or $5. The delta gradient is gradual, so picking the next-closest strike rarely matters more than a few basis points of premium.
Does a higher strike mean a safer trade?
For the same expiration, yes — a higher strike has lower delta and lower assignment probability. But it also has less premium. The 'safest' strike isn't useful if it doesn't pay you enough to be worth the trade.
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