Income tax treaties
(5) Income tax treaties. A nonresident alien individual who has a permanent establishment or fixed base, as defined in an income tax treaty between the United States and the country of residence of the nonresident alien individual, in the United States is subject to the filing deadlines as set forth in paragraph (b)(1) of this section. (6) Protective return. If a nonresident alien individual conducts limited activities in the United States in a taxable year which the nonresident alien individual determines does not give rise to gross income which is effectively connected with the conduct of a trade or business within the United States as defined in sections 871(b) and 864 (b) and (c) and the regulations under those sections, the nonresident alien individual may nonetheless file a return for that taxable year on a timely basis under paragraph (b)(1) of this section and thereby protect the right to receive the benefit of the deductions and credits attributable to that gross income if it is later determined, after the return was filed, that the original determination was incorrect. On that timely filed return, the nonresident alien individual is not required to report any gross income as effectively connected with a United States trade or business or any deductions or credits but should attach a statement indicating that the return is being filed for the reason set forth in this paragraph (b)(4). If the nonresident alien individual determines that part of the activities which he or she conducts in the United States in a taxable year gives rise to gross income which is effectively connected with the conduct of a trade or business and part does not, the nonresident alien individual must timely file a return for that taxable year to report the gross income determined to be effectively connected, or treated as effectively connected, with the conduct of that trade or business within the United States and the deductions and credits attributable to the gross income. In addition, the nonresident alien individual should attach to that return the statement described in this paragraph (b)(4) with regard to the other activities. The nonresident alien individual may follow the same procedure if the nonresident alien individual determines initially that he or she has no United States tax liability under the provisions of an applicable income tax treaty. In the event the nonresident alien individual relies on the provisions of an income tax treaty to reduce or eliminate the income subject to taxation, or to reduce the rate of tax to which that income is subject, disclosure may be required pursuant to section 6114.