Many brokerages will have a detail sheet that tells you the percentage invested in each area. You can multiply your investment times the percentage listed for the basis.
The instructions for Form 1116 state:
Line 4b Other interest expense includes investment interest, interest incurred in a trade or business, and passive activity interest. If you are a U.S. citizen, resident alien, or a domestic estate, and your gross foreign source income (including any income excluded on Form 2555) doesn't exceed $5,000, you can allocate all of your interest expense to U.S. source income. Otherwise, each type of interest expense is apportioned separately using an “asset method.” See Pub. 514 for more information. Example. You have investment interest expense of $2,000. Your assets of $100,000 consist of stock generating U.S. source income (adjusted basis, $40,000) and stock generating foreign source income (adjusted basis, $60,000). You apportion 40% ($40,000/$100,000) of $2,000, or $800, of your investment interest to U.S. source income and 60% ($60,000/$100,000) of $2,000, or $1,200, to foreign source income. In this example, you will enter the $1,200 apportioned to foreign source income on line 4b. You wouldn't enter the $800 apportioned to U.S. source income on any line of Part I of Form 1116.
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