OH, the other problem w/ being assigned early, is you may miss a dividend.
Example:
Stock is at 100, you do your 100/105 spread (long 100, short 105).
Stock shoots up to 200, you think, great, gaurenteed $5 on expiration day.
Tommorow there's a $2 dividend, the 105 call gets assigned to you, you're now long 1 contract of a 100 call, and short 100 shares of stock with a cost basis of 105.
But now, you're paying the $2 dividend, which means you're now $200 in the hole already, when you exercise your calls to sell at 100, you now only get a net of $300 back, instead of the $500 you were seeking (and should've received if you did the right thing and exercised your long calls).
Of course, this is an extreme example, but it doesn't take a stock to double before calls will be exercised to pick up a divvie.
Example:
Stock is at 100, you do your 100/105 spread (long 100, short 105).
Stock shoots up to 200, you think, great, gaurenteed $5 on expiration day.
Tommorow there's a $2 dividend, the 105 call gets assigned to you, you're now long 1 contract of a 100 call, and short 100 shares of stock with a cost basis of 105.
But now, you're paying the $2 dividend, which means you're now $200 in the hole already, when you exercise your calls to sell at 100, you now only get a net of $300 back, instead of the $500 you were seeking (and should've received if you did the right thing and exercised your long calls).
Of course, this is an extreme example, but it doesn't take a stock to double before calls will be exercised to pick up a divvie.
