Covered call writing calculations include initial and final computations. Since our trades incorporate both long stock and short option positions, it can become confusing when determining final capital gains (losses). In July 2019, Ralph shared with me a covered call trade he executed with Guidewire Software, Inc. (NYSE: GWRE). He sold an out-of-the-money (OTM) strike and was evaluating final outcomes under various circumstances.
*** Calculations do not include trading commissions
Ralph’s trade with GWRE
- 7/22/2019: Buy GWRE at $102.22
- 7/22/2019: Sell 1 x $105.00 8/16/2019 call at $1.13
Ralph astutely calculated his final returns as $391.00 if share price moved up to or beyond the $105.00 strike. This included the $113.00 for the option sale and $$278.00 from share appreciation up to the strike price. This represents a 3.8% 1-month return (1.1% + 2.7%). Let’s confirm this by using the multiple tab of the Ellman Calculator:

GWRP Initial Calculations
Final results if share price moves above the $105.00 strike and shares are sold at expiration
In this case, the final returns are the maximum return as established in the initial trade set-up, 3.8% as shown in the screenshot above. Since the stock shares are sold, this return is realized.
Final results if share price moves up to $104.00 and the option expires worthless at expiration
Realized profit on the option side is $113.00. Unrealized profit on the stock side is $178.00. If shares are sold, the stock profit would also be realized.
What if share value moves below the $102.22 purchase price?
The spreadsheet shows the breakeven at $101.09. Overall profit or loss will depend on that threshold.
Discussion
Covered call writing calculations have several components. There are initial and final calculations as well as realized versus unrealized capital gains (losses). The initial trade set-up must incorporate our initial time-value return goal range (2% – 4%, in my case). From there, our positions are managed to ensure the highest possible returns.
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