Instructions for Form 1065-X›(Rev. October 2025)›Specific Instructions
Name and Identifying Number
1025 Inst 1065-X (PDF) · 2026-10-03 edition · updated 2026-10-04 · United States
Enter the legal name of the entity and identifying number on the appropriate lines. Include the suite, room, or other unit number after the street address. If the post office doesn’t deliver mail to the street address and the entity has a P.O. box, show the box number instead.
If the entity receives its mail in care of a third party (such as an accountant or attorney), enter on the street address line “C/O” followed by the third party’s name and street address or P.O. box.
If the entity’s address is outside the United States or its territories, enter the information on the lines for “City or town,” “State,” and “ZIP code” in the following order: city, province or state, and foreign country. Follow the foreign country’s practice in placing the postal code in the address. Don’t abbreviate the country name.
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