One comment on this - Paying Quarterly for you taxes is not always the best method. Most traders pay only the 4th quarter payment due in January because income/loss can vary wildly throughout the year. You can follow the "Safe Harbor" rules on this to avoid penalties. I don't recall the exact specifics but it's something like you can pay 90% of last years tax by January 10 or 110% of what you expect to owe. It sure helps if you have losses at some point to provide some working capital.
