Nonresident aliens and foreign corporations in the United States must file their tax returns by the due date to avoid late penalties and interest. In addition, if their returns are still not filed within certain time limits after the due date, they risk losing certain tax deductions and credits.

Foreign corporations required to file a Form 1120F, "U.S. Income Tax Return of a Foreign Corporation," for the first time either this year or last year must file within 18 months after the due date of their current Form 1120F to avoid losing tax deductions or credits.

Foreign corporations not filing for the first time either this year or last year have an additional time factor to consider. They must file their returns by the earlier of 18 months after the current year tax due date, or by the date the IRS notifies them that their return has not been filed. Otherwise, the credits and deductions may not be claimed.

Nonresident alien individuals who must file Form 1040NR, "U.S. Nonresident Alien Income Tax Return," have the same basic criteria except they have only 16 months to file their return before losing tax deductions or credits.

Additional information is available by writing to the IRS, Assistant Commissioner (International), OP:IN:D:CS:HQ, 950 L'Enfant Plaza South, S.W., Washington, DC 20024, USA.

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