It depends.
If the LLC is taxed as a partnership, then you do not have to file form 1065, if the LLC does not have any income or expenses in 2016.
If the LLC has elected to be taxed as a corporation by filing form 8832, then you need to file form 1120 (or 1120S) even if the LLC has no income or expense in 2016.
Please refer to this IRS document for more information:
https://www.irs.gov/help-resources/tools-faqs/faqs-for-individuals/frequently-asked-tax-questions-an...
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