@alsn
My reading of :
https://personal.vanguard.com/pdf/FASFTCWS_R_012022.pdf
is that foreign source income for a particular fund, for 1116 purposes, is determined by multiplying the % in Column 1 by the dollar amount in box 1a of the 1099-div. The $ amount in box 1b is just a component of the amount in box 1a.
Did I mention I am not an accountant?
