Ivan decides that Dmitry has killed his father , until he visits Smerdyakov again â `` and Smerdyakov openly admits that he killed Fyodor Pavlovich . Smerdyakov also says that he was able to do this because of Ivanâ s ideas that â everything was allowed . Smerdyakov claims that Ivan was complicit in the murder by telling Smerdyakov when he would be leaving Fyodor 's house , and more importantly by instilling in Smerdyakov the belief that in a world without God `` everything is permitted . ''