Missing tax deadlines can lead to hefty fines. Here are the critical dates for foreign-owned US businesses:
Key Dates
Apr 15
Form 1120 (C-Corps) & Form 5472
Deadline for C-Corporations operating on a calendar year.
Apr 15
Form 1040-NR
Non-resident alien income tax return (if you have US-sourced income).
Jun 15
Form 1040-NR (Extended)
Automatic extension for those living outside the US (must still pay taxes by Apr 15).