Wow, doing my taxes and I saw that Massachusetts charges 12% tax on short term gains! Holy crap! That's higher than any other state by a considerable margin. tax rates of other states (on the $50,001st dollar): Conn: 5% RI: 7% CA: 9.55% (largest I found after MA, 2 and a half points less!) NJ: 5.525% NY: 6.85% MD: 4.75% FL: 0% TX: 0% PA: 3.07% Looks like traders just get screwed in Taxachusetts!