You do not need to file a separate income tax return for the LLC unless you made an election for the LLC to be treated as a corporation for federal income tax purposes (which appears to be highly unlikely based on your question).
Otherwise, your LLC is disregarded for federal income tax purposes and, in essence, is treated the same as a sole proprietorship.
Therefore, you would file a standard Form 1040 with a Schedule C (assuming your LLC is engaged in a trade or business).
