邮寄的时候需要附上8833吗,看irs网站8833表不是必须邮寄的。不知道理解对不对。 You do not have to file Form 8833 for any of the following situations: You claim a treaty exemption that reduces or modifies the taxation of income from dependent personal services, pensions, annuities, social security and other public pensions, or income of artists, athletes, students , trainees, or teachers. This includes taxable scholarship and fellowship grants.