Partnerships – File a 2022 calendar year income tax return (Form 1065). Provide each partner with a copy of their Schedule K-1 (Form 1065-B) or substitute Schedule K-1. To request an automatic 6-month extension of time to file the return, file Form 7004. Then file the return and provide each partner with a copy of their final or amended (if required) Schedule K­1 (Form 1065) by September 15.