alimony :n.赡养费
corporate tax :企业税
direct tax :直接税
excluding tax :不含税
gift tax :赠与税
income tax :所得税
inheritance tax :遗产税
IRS (Internal Revenue Service) :美国国税局
progressive taxation :累进课税
tax break :减税优惠
tax increase :增税
tax reform :税务改革
tax revenue :税收
taxation :n.课税；征税
taxpayer :n.纳税人