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Thanks  @DaveF1006 .  Line 16 is checked indicated K3 is attached on my K1 form.  However, the mail said Schedule K3 will be available in August 2022.  Line 20 on my K1 form has these values: A 9 and AG 37.  Do I need to file K3 for year 2021?  I already e-file my tax.  Do I need to amend it?  Thanks!