With the exception of Section 179 deduction, the items that you mention are all related to the computation of the Qualified Business Income Deduction (QBID). This year, there were changes in the way some of these items were reported on the 1120S K-1.
Below is an overview and also see this IRS publication. But you need to acquire the detailed STMT information from the person who generated the 1120S K-1.
An S-Corporation is required to report to its Shareholder(s) on the Schedule K-1 (Form 1120S) - Shareholder’s Share of Income, Deductions, Credits, etc., the information needed for the shareholder/owner to calculate any QBID. The S-Corporation reports this information on the Schedule K-1 (Form 1120S) in Box 17, Code V through Z. It is this information from Box 17 of the Schedule K-1 (Form 1120S) that should be used by the Shareholder to calculate any 199A Deduction on their individual return. The Box 17 information that is used in the QBID calculation is the following:
Section 199A income –the amount reported is generally defined as the income (or loss) that is related to the corporation's business activities. It should not include investment income, or the reasonable compensation paid to the shareholders for services rendered to the corporation.
Section 199A W-2 Wages – the amount reported is generally the wages paid by the corporation that were reported to the Social Security Administration on a W-2, as well as any elective deferrals and deferred compensation. Rev. Proc. 2019-11 provides additional guidance on how to calculate W-2 wages for purpose of Section 199A.
Section 199A unadjusted basis – the amount reported is the unadjusted basis of qualified property held by the corporation. Qualified property is generally defined as (1) the original cost of assets that were placed in service by the corporation in the past ten years and still used by the corporation and (2) the original cost of assets still being depreciated by the corporation because the recovery period is greater than ten years.
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