Note:
Internal Revenue Manual Part 25. Special Topics · 2026-10-03 edition · updated 2026-10-04 · United States
International taxpayers are those with an address that is not in the 50 states, District of Columbia, or an APO/DPO/FPO address. APO, DPO, and FPO addresses are considered domestic addresses.
In support of the commissioner’s Multilingual Strategy, review the taxpayer’s account for a Mail Filing Requirement (MFR) code and Limited English Proficient (LEP) Indicator before issuing IMF Correspondence.
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