Self-ascriptions of one’s current mental states often enjoy a distinctively strong presumption of truth. Some philosophers claim that this ascriptive authority is non-transferable in the sense that it cannot be matched or surpassed by anyone else. In this paper I examine this non-transferability claim in the light of potential extended mentality cases. These cases threaten to show that popular accounts of ascriptive authority do not vindicate its alleged non-transferability. However, I also argue that a less popular account of ascriptive authority can do so.