IRS說：
Students, Apprentices, Trainees, Teachers, Professors, and Researchers Who Became Resident Aliens
Generally, you must be a nonresident alien student, apprentice, trainee, teacher, professor, or researcher in order to claim a tax treaty exemption for remittances from abroad for study and maintenance in the United States, for scholarship, fellowship, and research grants, and for wages or other personal service compensation. Once you become a resident alien, you generally can no longer claim a tax treaty exemption for this income.
However, if you entered the United States as a nonresident alien, but you are now a resident alien for U.S. tax purposes, the treaty exemption will continue to apply if the tax treaty's saving clause (explained later) provides an exception for it and you otherwise meet the requirements for the treaty exemption (including any time limit, explained later). This is true even if you are a nonresident alien electing to file a joint return as explained in chapter 1.
Some exceptions to the saving clause apply to all resident aliens (for example, under the U.S.-People's Republic of China treaty); others apply only to resident aliens who are not lawful permanent residents of the United States (green card holders).
If you qualify under an exception to the treaty's saving clause, you can avoid income tax withholding by giving the payor a Form W-9 with the statement required by the Form W-9 instructions.
Saving clause. Most tax treaties have a saving clause. A saving clause preserves or “saves” the right of each country to tax its own residents as if no tax treaty were in effect. Thus, once you become a resident alien of the United States, you generally lose any tax treaty benefits that relate to your income. However, many tax treaties have exceptions to the saving clause, which may allow you to continue to claim certain treaty benefits when you become a resident alien. Read the treaty to find out if it has a saving clause and an exception to it.
Time limit for claiming treaty exemptions. Many treaties limit the number of years you can claim a treaty exemption. For students, apprentices, and trainees, the limit is usually 4–5 years; for teachers, professors, and researchers, the limit is usually 2–3 years. Once you reach this limit, you can no longer claim the treaty exemption. See the treaty or Publication 901 for the time limits that apply.
www.irs.gov/publications/p519/ch09.html
Students, Apprentices, Trainees, Teachers, Professors, and Researchers Who Became Resident Aliens
Generally, you must be a nonresident alien student, apprentice, trainee, teacher, professor, or researcher in order to claim a tax treaty exemption for remittances from abroad for study and maintenance in the United States, for scholarship, fellowship, and research grants, and for wages or other personal service compensation. Once you become a resident alien, you generally can no longer claim a tax treaty exemption for this income.
However, if you entered the United States as a nonresident alien, but you are now a resident alien for U.S. tax purposes, the treaty exemption will continue to apply if the tax treaty's saving clause (explained later) provides an exception for it and you otherwise meet the requirements for the treaty exemption (including any time limit, explained later). This is true even if you are a nonresident alien electing to file a joint return as explained in chapter 1.
Some exceptions to the saving clause apply to all resident aliens (for example, under the U.S.-People's Republic of China treaty); others apply only to resident aliens who are not lawful permanent residents of the United States (green card holders).
If you qualify under an exception to the treaty's saving clause, you can avoid income tax withholding by giving the payor a Form W-9 with the statement required by the Form W-9 instructions.
Saving clause. Most tax treaties have a saving clause. A saving clause preserves or “saves” the right of each country to tax its own residents as if no tax treaty were in effect. Thus, once you become a resident alien of the United States, you generally lose any tax treaty benefits that relate to your income. However, many tax treaties have exceptions to the saving clause, which may allow you to continue to claim certain treaty benefits when you become a resident alien. Read the treaty to find out if it has a saving clause and an exception to it.
Time limit for claiming treaty exemptions. Many treaties limit the number of years you can claim a treaty exemption. For students, apprentices, and trainees, the limit is usually 4–5 years; for teachers, professors, and researchers, the limit is usually 2–3 years. Once you reach this limit, you can no longer claim the treaty exemption. See the treaty or Publication 901 for the time limits that apply.
www.irs.gov/publications/p519/ch09.html
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