Sec. 1.6081-5 Extensions of time in the case of certain partnerships, corporations and U.S. citizens and residents.

(1) Partnerships, which are required under section 6072(b) to file returns on the fifteenth day of the third month following the close of the taxable year of the partnership, that keep their records and books of account outside the United States and Puerto Rico;

(2) Domestic corporations which transact their business and keep their records and books of account outside the United States and Puerto Rico;

(3) Foreign corporations which maintain an office or place of business within the United States;

(4) Domestic corporations whose principal income is from sources within the possessions of the United States;

(5) United States citizens or residents whose tax homes and abodes, in a real and substantial sense, are outside the United States and Puerto Rico; and

(6) United States citizens and residents in military or naval service on duty, including non-permanent or short term duty, outside the United States and Puerto Rico.

(1) A statement must be attached to the return showing that the person for whom the return is made is a person described in paragraph (a) of this section; or

(2) If a person described in paragraph (a) of this section requests additional time to file, the person must request the extension on or before the fifteenth day of the sixth month following the close of the taxable year and check the appropriate box on Form 4868, “Application for Automatic Extension of Time To File a U.S. Individual Income Tax Return,” or Form 7004, “Application for Automatic Extension of Time to File Certain Business Income Tax, Information, and Other Returns,” whichever is applicable, or in any other manner prescribed by the Commissioner.