The standard answer is "use 0.20-0.30 delta." It's not wrong. It's also not enough.
The right delta for a covered call depends on the stock's volatility profile, your tolerance for assignment, your time horizon on the underlying, and what other positions are in your portfolio. A 0.25 delta call on MSFT is a fundamentally different trade from a 0.25 delta call on TSLA — same delta, different actual risk.
This post is how I think about delta selection across the actual stocks in my portfolio. The framework is more useful than any single number.
Quick Refresher: What Delta Means for a Short Call
Delta is the option pricing model's estimate of how much the option's price will change for a $1 move in the underlying. For practitioners, the more useful interpretation is probability the option finishes in the money — a 0.20 delta call has roughly a 20% chance of expiring ITM (and therefore being assigned).
So a 0.20 delta call has roughly an 80% probability of expiring worthless. A 0.30 delta call has roughly a 70% probability of expiring worthless. The lower the delta, the lower the assignment probability — and the lower the premium you collect.
That's the tradeoff in one sentence: lower delta means less premium and less assignment risk; higher delta means more premium and more assignment risk.
The interesting question is where on that curve to operate, and the answer is "it depends."
The Three Delta Regimes
I think of CC delta selection as three regimes, mapped to stock IV profile.
Regime 1: High-IV stocks (TSLA, NVDA, COIN, AI/biotech): 0.10-0.15 delta
For high-IV stocks, the premium at 0.10 delta is already meaningful — often 0.5%-1.5% of cost basis for a 30 DTE contract. You don't need to push higher delta to get good income. Pushing higher delta on a high-IV stock means accepting a much higher probability that the stock makes a 10%+ move and assigns you out.
Specific example: TSLA at $300 with elevated IV. A 0.10 delta 30 DTE call might be at $360 strike with $4 premium ($400 per contract). That's 1.3% on $30K of cost basis. Pushing to 0.20 delta puts the strike at maybe $335 with $9 premium — better income but you're now at meaningful risk of assignment any time TSLA has a normal weekly move.
The right play on high-IV names is to harvest the rich premium at low delta and accept that you'll get assigned occasionally when TSLA does what TSLA does.
Regime 2: Blue chips with moderate IV (AAPL, MSFT, GOOGL, AMZN, JNJ, KO): 0.20-0.25 delta
For stable large-caps, 0.20 delta often pays so little that the trade isn't worth doing. IV is moderate, the stock doesn't move much, and a 0.10 delta call on AAPL might be $50-$80 in premium for a 30 DTE — barely enough to bother with after fees and effort.
For these names, 0.20-0.25 delta is the right range. You collect $200-$500 in premium per contract, the underlying moves 2-4% in a typical month, and you get assigned occasionally — which is fine because these stocks tend to grind upward over time and assignment at your strike is a clean outcome.
I run most of my MSFT, AAPL, GOOGL, and AMZN positions at 0.22-0.25 delta on 30-45 DTE contracts.
Regime 3: Dividend-heavy names (KO, PG, JNJ, T, VZ): 0.15-0.20 delta, OTM-only
For dividend stocks, the early assignment risk around ex-dividend is the dominant factor. If your call has less extrinsic value than the next dividend, the call can be exercised early to capture the dividend — and you lose the dividend you were counting on.
Strategy: stay further OTM than you would on a non-dividend name. 0.15-0.20 delta gives meaningful distance between strike and current price, which preserves enough extrinsic value to make early assignment unprofitable for the call holder.
For more on this dynamic, see Covered Calls on Dividend Stocks.
The Tradeoff Curve, Visualized
Here's the actual data from my portfolio on a typical month, at 30 DTE:
| Delta | Avg Monthly Premium Yield | Assignment Rate (per contract) | |---|---|---| | 0.10 | 0.4% | ~10% | | 0.15 | 0.6% | ~15% | | 0.20 | 0.9% | ~22% | | 0.25 | 1.1% | ~28% | | 0.30 | 1.4% | ~33% | | 0.40 | 1.9% | ~42% |
A few things to notice. First, the assignment rate roughly tracks delta (as expected). Second, premium yield doesn't scale linearly — going from 0.20 to 0.30 delta gets you ~50% more premium but doubles the rate at which you'll be assigned out. For most names you want to be in the 0.20-0.25 zone where the marginal premium is decent and the assignment rate is manageable.
Important caveat: assignment rate isn't the same as profitability. Sometimes assignment is the best outcome (you sold a call at $200 strike, stock ran to $215, you sold at $200 plus the premium — that's a winning trade). The "right" delta depends on whether you'd be happy to sell at the strike if assigned.
What Option Alpha Found
Option Alpha published a multi-year study on covered call delta selection across thousands of simulated trades. Their headline finding: 30 delta produced the best risk-adjusted returns across the full sample.
This is a useful data point but it's a single number across an aggregate sample. Their study lumped together stocks with very different IV profiles. If you separate by IV regime, the optimal delta shifts: high-IV stocks favor lower deltas (because absolute premium is already high), and low-IV stocks favor slightly higher deltas (because you need delta to extract any premium at all).
The way I read their study: 30 delta is a defensible default if you want one number across your whole book. But you'll do better with a regime-aware approach — lower delta on high-IV names, higher delta on low-IV names, and a careful ex-div strategy for dividend payers.
When to Deviate
Three situations where the "default delta for the regime" isn't the right answer:
You actively want to be assigned. If you've been holding a stock for a long-term gain and you're ready to exit at a target price, sell a higher-delta call at that target price. You're using the covered call as an exit mechanism with a premium kicker. 0.40-0.50 delta is fine here.
The position is over-weight in your portfolio. If a single position has run to be 25% of your portfolio and you'd like to trim, sell 0.30-0.40 delta calls. The likely assignment is the goal, not a bug.
You'd be uncomfortable owning the stock at any lower price. If you've changed your view on a holding but don't want to sell outright (tax reasons, or just dithering), sell aggressive 0.40+ delta calls. You're effectively trying to get assigned out at a price near the current market.
The general principle: delta selection should reflect your actual relationship with the underlying. If you love the stock and want to keep holding, stay 0.15-0.20 delta. If you'd be fine selling at the strike, run 0.25-0.30 delta. If you actively want to exit, run higher delta.
DTE Interaction
Delta is one variable. DTE is the other. They interact.
A 0.20 delta call at 7 DTE is mostly all extrinsic value (very high theta, decays fast). A 0.20 delta call at 60 DTE has more extrinsic value in absolute terms but lower theta — it's worth more but decays slower.
I prefer 30-45 DTE for most positions. Theta is meaningful, the strike has reasonable distance from current price, and there's room to manage the position before expiration. 7-14 DTE is fine on high-IV names where you want to harvest premium fast and avoid earnings exposure. 60+ DTE pays more in absolute terms but ties up the position too long for active management.
The Tooling Angle
Once you've picked a delta target, the work shifts to finding contracts at that delta across your whole portfolio. This is where screeners earn their keep — manually pulling up each chain to find a 0.22 delta strike on each of 15 positions takes 30+ minutes. A screener that filters by delta range across all positions takes 30 seconds. Myron's screen is built around this exact use case: pick your delta range and DTE range once, see candidates across your entire portfolio.
For more on the management side, see When to Roll a Covered Call. For ticker-specific delta guidance, see AAPL Covered Calls, NVDA Covered Calls, and TSLA Covered Calls.