I am working on an individual tax return. In calculating Qualified Business Income for an S-corporation in my worksheets I have 3 lines. Business Income XXX comes from the QBI page of the K-1, then Loss disallowed due to basis, at-risk or passive rules (this is a positive add back), third line if Charitable Contributions not included in taxable income (this is a positive add back). These three figures equal the amount going to Line 1c on the Form 8995. I have looked and calculated every number combination I can come up with. I have spent hours on the phone with Lacerte over the past 5 days. I can not determine how the Loss disallowed due to basis, at-risk or passive rules is calculated to get this add back. Lacerte can not provide any details for formulas for the calculation either. Anyone else run into this issue with a client or do you know what does into this calculation?