Shinzei is originally denso (rice field tax) collected from Jinko (the administrative households that was considered as belonging to deities) of specific shrines, stored and used for religious services and repair of the shrine under the ritsuryo system of ancient Japan.
神税（しんぜい）とは、古代日本の律令制において、特定の神社の神戸から徴収された田租を貯蓄して保管し、神社の祭祀・修繕に用いるために充てられた稲穀。