俺的理解哈，下手砸轻点。
首先，给大家提个醒，IRS是米国最友善的部门了，有问题，打电话，发email去问，有问必答，态度巨和善。
至于你那具体的问题吧，你去www.irs.gov download publication 519 U.S. Tax Guide for Aliens. Page 51 讲 Treaty Income: students, apprenties, Trainees, Teachers, Professors and Researchs who became resident alients.
Some exceptions to the saving clause apply to all resident aliens (for example, under the US-China treaty).......
人还给了个example:
Mr. Yu a citizer of People's republic of china, entered the US as a nonresident alien student on Jan.1,2002. He remained a nonresidnet alien
through 2006 and was able to exclude his scholarship from US tax in those years under Article 20 of the US China treaty. On Jan,1,2007, he became a resient alien because his stay in US exceeded 5 years. Even though Mr. Yu is now residnet alien, the provisions of Article 20 still apply because of the exception to the saving clause in the protocol to US-china treaty dated April 30,1984.
按俺的理解吧，只要是你是F-1,这5000块treaty一值有效。
小色，小高同学在吗？就冲俺瞧那条约这么长，不给俺置顶，俺跟你急。