Yes...if you are a Single Member LLC, you can just file a Schedule C with your Form 1040.
An LLC is an entity created by state statute. Depending on elections made by the LLC and the number of members, the IRS will treat an LLC either as a corporation, partnership, or as part of the owner’s tax return (a disregarded entity). Specifically, a domestic LLC with at least two members is classified as a partnership for federal income tax purposes unless it files Form 8832 and affirmatively elects to be treated as a corporation. An LLC with only one member is treated as an entity disregarded as separate from its owner for income tax purposes (but as a separate entity for purposes of employment tax and certain excise taxes), unless it files Form 8832 and affirmatively elects to be treated as a corporation.
If the LLC is a corporation, normal corporate tax rules will apply to the LLC and it should file a Form 1120, U.S. Corporation Income Tax Return. The 1120 is the C corporation income tax return, and there are no flow-through items to a 1040 from a C corporation return. However, if a qualifying LLC elected to be an S Corporation, it should file a Form 1120S, U.S. Income Tax Return and S corporation laws apply to the LLC. Each owner reports their pro-rata share of corporate income, credits and deductions on Schedule K-1 (Form 1120S).
For additional information on the kinds of tax returns to file, how to handle employment taxes and possible pitfalls, refer to Publication 3402, Tax Issues for Limited Liability Companies.