Most tax treaties have a saving clause that preserves the right of each country to tax its own citizens and treaty residents as if no tax treaty were in effect. However, the saving clause generally excepts specified income types from its application, which may allow you to claim certain treaty benefits even if you are a U.S. citizen or resident.
In many cases, U.S. citizens and U.S. treaty residents will not be able to reduce their U.S. tax based on treaty provisions due to the saving clause. However, those who are subject to taxes imposed by a treaty partner country are entitled to certain credits, deductions, exemptions and reductions in the rate of taxes paid to that foreign country. These treaty benefits are generally only available to residents of the United States. Foreign taxing authorities sometimes require certification from the United States that an applicant filed an income tax return as a U.S. resident, as part of the proof of entitlement to the treaty benefits. Form 8802, Application for United States Residency Certification, must be filed to obtain this certification.

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