Board Thread:Theories and Speculation/@comment-2143336-20171001221219/@comment-33352578-20171015212213

If we go by Anime (cause it had a few extra scenes) Naruto is still officially a Genin at the end of the war. Kakashi wishes to grant him the immediate rank of Jonin but said he had to revise and make sure he knew everything first, which'd take a couple of years by his estimate. He could have been promoted to Chunin then and there but it's not stated. By 'the Last' Naruto should officially be a Jonin. Then he is obviously passed on the title of Hokage by Kakashi.