what it is looking for are two items -- total interest & other expenses associated with this foreign income -- usually this is zero and binned to USA since your account is in the USA; next it is looking for the total investment you have in these shares that generate the foreign dividend and foreign taxes --- it needs the total and then will allocate the to each of the foreign columns based on income from the underlying shares -- it is not a tax event.
Thus for a foreign income ( dividend total ) of 2500, of which 500 ( underlying invetment of 4000 )came from Japan and 2000 ( underlying investment of 20,000 ) came from China --- you would need to enter investment expenses of zero ( if there was none -- usual case ) and then enter 25,000 for the total investment generating the foreign income. I am assuming here that you actually have paid enough foreign taxes for all this work to be worth it . Generally if the income is from Mutual funds with underlying foreign shares -- you would have to use the funds ownership ratios to compute these factors.
Hope this helps.
If you need , please provide relevant foreign taxes and dividends ( note this is public board and so no personally identifiable items ).
