Annualizing a covered call, correctly
Annualized return on a covered call is the premium divided by the capital the position ties up, scaled to a year by the days you hold it. The formula is trivial. Choosing the capital base is not, and that choice is where most published covered call yields quietly become incomparable.
The formula everyone uses:
Annualized return = (premium / capital) x (365 / days held)
On the running example: $0.62 credit, $71.40 stock, 41 days. That is (0.62 / 71.40) x (365 / 41) = 0.868% x 8.90 = 7.73% annualized.
Fine. Now the two things that make that number lie.
Problem 1: which capital
Divide the premium by what, exactly. There are three defensible answers and they produce wildly different numbers.
| Base | Value | Annualized |
|---|---|---|
| Current share price | $71.40 | 7.73% |
| Your cost basis | $62.80 | 8.78% |
| Strike price | $75.00 | 7.35% |
Use the current share price. That is the capital genuinely committed right now, because you could sell the shares today and have that cash. Your cost basis is history and using it flatters every position you are up on. The strike is the most conservative and it understates what you are actually risking.
The point is not that one is right and two are wrong. It is that a screener showing you 8.78% and another showing 7.35% may be describing the identical trade, and neither will tell you which base it used.
Problem 2: 365 times a 41-day return is not a real year
Simple annualization assumes you can do this trade 8.9 times in a row at the same terms. You cannot. Volatility changes, your strike gets hit, the stock moves, and a month arrives where nothing on the chain is worth writing.
Annualizing is a comparison tool, not a forecast. It exists so you can rank a 14-day trade against a 41-day one on the same axis. Treating 7.73% as next year's income is how people end up disappointed by a strategy that worked exactly as designed.
The number that actually matters
Static return and if-called return are different questions and both deserve their own answer, which is why they get a separate page. The short version: the 7.73% above is the static return, meaning the premium alone assuming the stock does not move. If KO gets called at $75 you also collected $3.60 of share appreciation, and the combined return over those 41 days is 5.91 percent, or about 52 percent annualized.
Quoting that 52 percent as your yield would be dishonest, since it depends entirely on the stock cooperating. Quoting only 7.73 percent understates the good case. Report both.
What to subtract before you believe any of it
- Commissions. $0.65 a contract each way is 2 percent of a $0.62 credit. Not nothing.
- The spread you actually crossed. If you filled at $0.55 rather than the $0.62 mid, your real annualized return is 6.86 percent, not 7.73 percent. That is an 11 percent haircut and it never appears in any screener.
- Taxes. Premium on a call you write is generally short-term. Your after-tax yield is materially lower than the headline and depends on your bracket.
Run yours through the annualized return calculator or the covered call calculator, both of which show static and if-called side by side rather than picking the flattering one.
Questions people actually ask
Should I use 365 or 252 days to annualize?
Use 365. You hold the position over calendar days, including weekends, and the option decays over them too. The 252 trading-day count belongs in volatility math, not here.
Why do two screeners show different yields for the same trade?
Almost always a different capital base, or one is quoting if-called and the other static. Occasionally one is using the mid and the other the bid. Check before comparing.
Is a 20 percent annualized covered call good?
It usually means high implied volatility, which means the market expects a big move, which means a real chance of owning a stock that just fell hard. High yield is a description of risk, not a free lunch.
Keep reading
Do the math on your own trade
Every price in this article is an illustrative worked example, not a quote. Read Covered calls for the rest of the series, and the disclaimer before you act on any of it. Selling options carries real risk of loss, and the loss can be far larger than the premium you collected.