Rekimyo are different from family registers in that they record the amount of choyo (taxes in tribute and labor under the ritsuryo system) to be borne by each household and probably the amount of choyo for the whole ri, and they provide detailed information on a comparison of household members from the previous year.
各戸ごとに負担すべき調庸額が記録され、おそらく里全体の調庸額も記録され、前年との戸口の異同が詳細に示されていた点が戸籍と異なる。