When does LLC must file its income tax return

LLC filing deadlines depend on the entity election to be treated as corporation or disregarded entity and the number of owners. LLC elected to be treated as corporation. Form 1120 or Form 7004 (Application for Automatic Extension of Time To File form 1120).   These forms are due on the 15th day of the 3rd month after the end of the LLC's tax year.  Form 7004 is used to request an extension of time to file Form 1120 . Timely filed form 7004 allows the LLC to file its annual tax return by the 15th of the 9th month after the end of the LLC's tax year. Estimated tax payments are due on the 15th day of the 4th, 6th, 9th, and 12th months of the LLC's tax year. Single Member LLC. Single-member LLC that does not elect to be treated as a corporation is a “disregarded entity,” and the LLC’s activities should be reflected on its owner’s federal tax return - Form 1040 or 1040NR (if the owner is a non US resident).  This form is due on the 15th day of the 4th month after the end of your tax year. Form 4868 is used to request an extension of time to file Form 1040. Timely filed form 4868 extends the filing deadline by 6 months. Estimated tax payments (Form 1040-ES). Payments are due on the 15th day of the 4th, 6th, and 9th months of your tax year and on the 15th day of the 1st month after your tax year ends.

If the single-member LLC is owned by a corporation or partnership, the LLC should be reflected on its owner’s federal tax return as a division of the corporation or partnership

Multi Member LLC. Form 1065.   This form is due on the 15th day of the 4th month after the end of the partnership's tax year. Provide each partner with a copy of Schedule K-1 (Form 1065) or a substitute Schedule K-1. Timely filed form 7004 allows the LLC to file its annual tax return by the 15th of the 9th month after the end of the LLC's tax year.