Guys - the way I see it is this.
osho67 has bought 100 shares of MSFT @ $28.50 for an outlay of $2850. Against these he/she has sold a single January 2004 $30 call contract and taken in premium of $125. He/she keeps this in all circumstances. Assuming that the share price of MSFT stays unchanged (or stays below $30), this call will expire worthless and osho67 keeps the $125 and repeats the process for April or July (MSFT options have series for Jan, April, Jul and Oct). The return applicable to the option premium in isolation is therefore (125/2850) x 100 = 4.39%. This has been achieved in 4 months, so the annualised return will be 4.39 x (12/4) = 13.17% per annum.
The return for the strategy as a whole will depend on what happens to the price of MSFT. The maximum profit possible will be if the price reaches $30. There will then be a gain in MSFT of $1.5 x 100 = $150. The percentage gain is therefore (150/2850) x 100 = 5.26% gained in 4 months. Annualised this is 5.26 x (12/4) = 15.79%.
Therefore the maximum annualised profit for the strategy is 13.17% (option premium) + 15.79% (share price increase) = 28.96%. In addition to this will be any dividends paid ( b***** all in the case of MSFT).
The attraction of this strategy is that even if the share price stagnates there is still 13.17% annual profit to had from the call
premium, the downside being that in the event of the price of MSFT running up thru $30 osho67 will not participate in any additional benefit because the shares will be called away at $30. If the share price falls $1.25 to $27.25 osho67 still breaks even because he/she keeps the option premium of $125 in all cases.
If the price of MSFT falls early on in the strategy then there is a decision to be made. If the shares are sold at a stoploss, then the calls are no longer covered. In the event of a runaway rally above $30 there would be a loss per share equal to the amount by which the price exceeds $30. Why? Because if the price went (say) to $36, osho67 would have to buy the shares at $36 in the market and hand them to the buyer of his option at $30, so creating a loss of $6 per share. Therefore if the shares are sold before expiry of the option, you need to decide whether to buy the calls back, which you should be able to do for a profit because the share price has fallen, plus time decay has worked in your favour, or hang on to them and carry the risk of the price rising above the strike price, in this case $30. You choose!
HTH