The 20% QBI deduction will not be calculated or reflected on your 1120S return. It is an individual income tax deduction on the 1040 form. Since you have the QBI amounts (required for the deduction calculation) on your K-1 form, enter the K-1 form into your personal tax return (1040) and then the 20% QBI will be calculated and reflected on line 9 of the 1040 form.
