- This is the deadline for filing a 2017 S Corporation or Partnership return or extension.
- S Corps: File a 2017 calendar year income tax return (Form 1120 or Form 1120S) and pay any tax still due. If you want an automatic 6-month extension, file Form 7004 and deposit what you estimate you owe.
- Partnerships: File a 2017 calendar year return (Form 1065) and provide each partner with a copy of Schedule K-1. If you want an automatic 6-month extension to file the return and provide Schedule K-1 or a substitute Schedule K-1, file Form 7004. Then file Form 1065 by September 15.
