Quote from gaj:
good cpa for traders = hard to find. i know green does it (you'll see his name mentioned on ET), there are others.
oh! forgot one cool rule, which i think is what might be the "safe harbor" rule. roughly...
if you make, let's say, 50k in 2009.
and the next year, you make 200k...
you do NOT get penalized if you're "late" (ie. pay in 2011 for 2010 estimated taxes) on any amount more than 110% of that 50k. the next year, your number would be 200k * 110%.
i'm fairly certain it's 110%. again, check the IRS stuff, because it's in there.