The minimum karoku (hereditary stipend) of roju (member of shogun's council of elders) was 25,000 koku (1 koku = approximately 180.39 liters) rice crop yields, and, if a daimyo whose position was close to roju, but was receiving less, he was treated as rojukaku; likewise a mujo daimyo (a daimyo without a castle) was treated as joshukaku daimyo.
老中の最低家禄が2万5,000石であり、これに満たない場合は老中格となり、無城大名は城主格大名とされた