Ayatollah Mahdi Hadavi Tehrani
1. Khums should be spent by the guardian of Muslims' affairs (wali amr) directly or by his authorized representative. Therefore, a person can use Khums or dispose of it only if he has permission from the Wali Amr?
2. A qualified Mujtahid who meets all conditions of Taqlid has Wilayah (guardianship). Hence, one can give his Khums dues to him or his representative irrespective of whether he is his Marja' Taqlid or not. Of course, in the case of the establishment of an Islamic government, the precaution is to give the Khums to him or his wakil (representative). If he consents that Khums be give to any qualified jurists, there would be no objection.