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"no need to have  multiple columns per payer on a single 1116. The columns are for the scenario of multiple countries, not payers, and your country here is "RIC".

I'm a counter example to your statement: This is precisely what I did with my TD Ameritrade 1099 that resulted eFile being accepted. I had two different funds that were RIC, and I had to enter both of them on my 1116 Wks Column A and B, in Parts 2 and 3, to eFile successfully, even though both funds were in TD Ameritrade. I know this is unnecessary with paper filing, as my CPA returns for the last four  years attest.

 

But a bigger problem here, beyond what I said about different investment houses reporting foreign taxes differently, is that TurboTax keeps issuing updates, without any version control information. Scary that I'm still getting updates weeks after I eFiled my taxes. Hope the changes weren't important for me, but they never tell me that. Today's updates may undo a version of TT that allowed me to eFile, but how do I know that?