Board Thread:Versus Debates/@comment-26005711-20160614093346/@comment-26537507-20160614170537

In regards to Sasuke deactivating his Rinnegan, this is a direct quote from his page with the reference coming from The Last.

After first obtaining it, Sasuke was unable to deactivate his Rinnegan, forcing him to close it if he used too much chakra to control it properly. Sometime during the first two years of his travels, he mastered it enough to deactivate it at will.