@pk Thank you for persisting! Yes, I agree, and I did try working through the 8615 with the instructions while answering the TT questions, but at entry 8 on the 8615 the two stopped corresponding, and it was impossible for me to figure out the correspondence, and why e.g. there were two sets of questions in TT about sibling passive income, when I entered all the info on the first set (it was the second set of questions that asked about schedule D etc). I left that set empty in the end and filed (leaving it to the IRS to figure out if I did something incorrectly), but I would love to figure this out for next time. I don't think the complication is anything specific to Croatia, just the fact that, because we're filing 2555s, the way we figure out our taxes is the exception to the rule, and as you correctly said, the TT questions became abstruse.
