You may be mixed up.
A form 1040 is just your regular tax return that you always file.
If you formed a single member LLC, that is considered a "disregarded entity". You report your income and expenses on schedule C, which is attached to your regular tax return. Schedule C calculates your taxable income or loss, and that information flows to the rest of your tax return (form 1040) where it is combined with any other income, and your personal deductions and credits, to calculate your final tax.
However, if the LLC has more than one member, you must file a form 1065 partnership return. This is a different tax return and requires a different business tax program. The 1065 lists income and expenses, and the profit or loss is passed on to each partner using a K-1 statement, that is added to each partner's personal tax return. (There are special rules if the only other member is your spouse and you live in a community property state.)
