@Carl I fiddled around long enough and got it all back to where it was: The correct 40 years for Residential real Estate abroad with ALT/MM settings. All good. The key is in using FORM view and entering everything directly there (including the generation of new forms needed) versus using step-by-step, which handles it wrong. That happens quite frequently in T, I noticed. Also the case for Forms 1116 if you have to cover more than 3 countries or have one 1099 provider giving you multiple country codes. Or Form 8615 (that only asks for the parent's income but not if they have a sibling or if the parents had qualified dividend payments, etc., which all influence the tax calculation).
The result is that the tax calculation when using step-by-step is not possible (former case/form) or wrong (latter case/form). To get it right you HAVE to use the FORM view and make sure you fill out all relevant fields there.
