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@DianeW777  Thank you for your response, but the calculation you've described (the same as @RobertB4444 ) does not make sense to me. Let's take this example:

 

Let's say that the number in box 1a is $1,000 and that I own shares of Vanguard's Total International Index and Total International Bond II Index funds. According to Vanguard's table of foreign source income percentages , the percentages for the Total International Index and Total International Bond II Index funds respectively are 90.34% and 59.8%. 

 

Following the calculation you described, the total foreign dividends I received last year is:

0.9034 * 1000 + 0.598 * 1000 = $1501.4

 

That's more than the $1000 in total dividends I received for the year. 

 

The response from @SteamTrain is in line with how I thought I should be calculating the total foreign dividends. Am I misunderstanding you and @RobertB4444's  answers?