Board Thread:Naruto Discussions/@comment-26508646-20150704031517/@comment-5936871-20150710015307

@Rage It should also be noted that in order to undo Infinite Tsukuyomi, you need the chakra of all the beasts and Rinnegan. Even after their fight, together, both Naruto and Sasuke undid the seal. Therefore, Naruto still has their chakra, it's quite obvious that it would just regenerate afterwards.

Also, in The Last, Naruto manifested Kurama outside of his body to battle the Hamura Statue. So it's possible that he couldn't use SPSM since the larger portion of his power was used to manifest Kurama, while he could only maintain NTSCM at the time. But regardless, Gaiden confirms he still has SPSM.