The IPA provides a standard, unambiguous way of writing the pronunciation of words, which can be quite helpful when learning a language like English, which has very irregular spelling (with respect to pronunciation).
But when learning a language which has regular, phonetic spelling, are there advantages to using the IPA?
When I learned Spanish, I wasn't even aware of the IPA. I became aware of the IPA later, when I was learning Portuguese (which also has regular/phonetic spelling). Now I'm learning French, which is also phonetic, but with more complex spelling rules. How might the IPA be beneficial with these languages, or any other language spelled phonetically?