The IRS just announced that filing for business tax returns for the tax year 2022 will be on Thursday, January 12th. This will include forms 1120, 1120S, 1065, and 990 (corporate, s-corp, partnership, non-profit). The 990-T (non-profits un-related business income) and 4720 (Excise taxes) are still in the development testing phases and will be available very soon.