does LLC's have to file federal taxes?

They do.

Single member LLC is treated as a sole proprietorship (1040 schedule C).

Multi member LLC is treated as a partnership (1065, schedule k-1).

If an election is made to be taxed as a corporation, then forms 1120 or 1120s are used.

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Of course.

The LLC does file as do he owners

Not unless you elected to be taxed as an ss-corp, or are a partnership. Most LLCs' income and expenses are filed on the owner's return, on schedule C.

NA has a great answer.

Yes