Highest maximum income tax William Lawrence Sr Omnibit 4-15-19 Portugal — at 82.75 percent — has the highest maximum income tax rate in the world. Highest maximum income tax William Lawrence Sr Omnibit 4-15-19 Share this:PrintFacebookTwitterTelegramMeWeWhatsAppPinterestLinkedInParlerGabRedditEmailMorePocketTumblrLike this:Like Loading... Related