That depends.
If you have a single-member LLC and had no income or expenses, you do not need to file a Schedule C for the LLC.
If you have an LLC with an election to be treated as a S or C corporation, then you would be required to file an 1120-S or 1120.
If you have a multi-member LLC (treated as a partnership by default) with no income or expenses, then you do not need to file a Form 1065.
