Quote from cdcaveman:
there is a cost of carry... but its nothing considering the time your in and out.. and yes.. the sale of the same strike put to the purchase of a call offsets the theta.. covering a long position in a day trade would be to sell a call and buy a put.. conversion is what its called... essentially your short stock in a synthetic options position completely offsetting your long position in the underlying..... you can leave it to expiration if you really wanted.. but if the put is in the money you need to call your broker and make sure you excise your put
The put and call theta are =, yes. The dividend is embedded in the synth, so it may not trade to the penny with shares as the div is not priced in the natural. The forward on the synthetic isn't really an issue at 0.56 in yearly rates.
