It's too late to file an extension for a partnership/multi-member LLC (Form 1065).
- Due Dates for Form 1065 are: March 15, 2019 (September 16, 2019 with extension) for 2018 tax returns.
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What is the penalty for filing a Form 1065 late? The penalty is $200 for each month or part of a month (for a maximum of 12 months) the failure continues, multiplied by the total number of persons who were partners in the partnership during any part of the partnership's tax year for which the return is due.