Implied Volatility (IV) for Covered Call Sellers

What Is Implied Volatility?

Implied volatility (IV) measures the market's expectation of how much a stock will move over a given period. Higher IV = the market expects bigger price swings = options are more expensive.

For covered call sellers, IV is your best friend because higher IV means higher premiums. You're selling options, so you want to sell expensive options.

IV is expressed as an annualized percentage. An IV of 30% means the market expects the stock to move up or down by roughly 30% over the next year. Daily expected move ≈ IV / √252.

IV Rank and IV Percentile

Raw IV numbers vary by stock (NVDA might have 45% IV while KO has 15%). To compare across stocks, use:

IV Rank: Where current IV falls relative to its 52-week range. • Formula: (Current IV - 52-week Low IV) / (52-week High IV - 52-week Low IV) • IV Rank of 80% means current IV is near its yearly high

IV Percentile: What percentage of days in the past year had lower IV than today. • IV Percentile of 90% means IV is higher today than 90% of the past year

Sell covered calls when IV Rank is above 50% — premiums are inflated relative to recent history. Avoid selling when IV Rank is below 20% — premiums are depressed.

How IV Affects Your Premium

The impact of IV on covered call premiums is dramatic:

Example on a $200 stock, $210 strike, 30 DTE: • IV at 20%: Premium ≈ $1.50 (0.75% monthly yield) • IV at 35%: Premium ≈ $3.50 (1.75% monthly yield) • IV at 50%: Premium ≈ $5.50 (2.75% monthly yield) • IV at 70%: Premium ≈ $8.00 (4.0% monthly yield)

The same trade at different IV levels can yield 2-5x more income. This is why selling covered calls on high-IV stocks (tech, growth) generates more income than low-IV stocks (utilities, consumer staples).

Covered Call Pro ranks opportunities by premium-per-day, automatically prioritizing stocks where IV creates the best income potential.