Starting with the 2021 tax year, IRS forms K-2 and K-3 are new schedules that may need to be included with 1065 (Partnerships), 1120S (S Corporations), or 8865 (Certain Foreign Partnerships) filings. These are all pass-through entity filings that include Schedule K-1, which reports a partner’s or shareholder’s share of the entity’s profits, losses, deductions, and credits for the year, and the K-2/K-3 schedules are an extension of that.