The three column approach didn't work for me, when I had an AMT carryover from previous years. That's why I followed the suggestion to not use the simplified calculation, which did work (and kept a large carryover from previous years intact). Not worrying too much about getting a letter from the IRS if you switched calculation methods may be a different cost-benefit analysis if you're a person filing your own return vs. a preparer doing many returns. I decided to go with the solution outlined several pages above and to take the small risk the IRS might not be happy with a country being added on the 1116AMT by changing the calculation method. For a preparer, you might reasonably wait to see if TurboTax can fix the problem.
