How is line 10 on 1040 computed when I have no businesses and the total of line 5 on my dividends does not equal the number on fthe form that feeds it?

Line 10 of Form 1040 is Qualified Business Income deduction, which is calculated on Form 8995 or Form 8995-A. 

 

In addition to a traditional business, QBI is also:

1. Qualified REIT dividends.
2. Qualified PTP income or loss.
3. Income from K-1 forms.
4. Rental income, if certain requirements are met.

 

Since you also mentioned line 5 of 1099-DIV, if you have a figure there, that is what is triggering the QBI deduction. To see how it was calculated, just take a look at Form 8995 or 8995-A, 

 

Agree i had a test number in my dividends and deleted when got actual data. The total does not equal the parts.. Think there is a software flaw