fivecents
I understand, if you start producing over a number of trades a year, your accountant will change his rate structure. Charging by the trade. I never hit that number, so can't help more. Taxes the same as any trade under 30 days, I think, but much more paper work!
I don't play much attention, all I know is every time I make over $500 profit on one trade during the month, I write a 20% monthly check for all that month, to a special money market saving account and pay the tax & accountant from there. Usually enough.