A new crop of day traders are learning they have to think fast about buying, selling and holding stock — and they might need to think quickly about tax planning strategies for next season as well. July 15 isn’t just the deadline to file federal income taxes. It’s the deadline when people trying to make a living off their stock market savvy need to tell the Internal Revenue Service how they want the tax agency to tabulate their gains and losses for the upcoming tax season. There’s no one-size answer on whether to go for the “mark-to-market election,” experts say. It can result in big time deductions for some, but big ... (full story)