In the IRS Instructions for Form 1040, page 101, the first requirement for claiming the foreign tax credit without Form 1116 is the following.
"All of your foreign source gross income was from interest and dividends and all of that income and the foreign tax paid on it were reported to you on Form 1099-INT, Form 1099-DIV, or Schedule K-3 (or substitute statement)."
If you enter the foreign tax paid on a 1099-INT, 1099-DIV, or Schedule K-1, TurboTax will put it on Schedule 3 line 1. If you paid foreign tax that is not reported on one of those forms, you have to use Form 1116.
Also note that the $600 maximum is for married filing jointly. If you are not filing a joint return the maximum is $300.
