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I believe that I imported the 1099-B by inputting the brokerage EIN or whatever it asked for, but apparently only one 1099-B was imported into the form 8949. No I do not understand why the 3731 ended up on line 13 since I had no long term cap gains. I was using the online version. There were no amended 1099s.

Here is the summation of the  two 1099s. As can be seen neither shows any LTCG.

How would a taxable income of 38,900 and a LTCG of 3731 lead to a tax due reduction of $324?