There were various forms of zakko, such as Kudarabe, Kudarahe and Shiko who were summoned to serve on a periodic rotating or temporary basis, Zokuko and Kanuchibe who were required to work for government offices in the agricultural off-season, and Hakohe who offered a certain amount of products every year.
その形態には様々な形態があり、百済手部・百済戸・飼戸のように一定期間ごとの交替制あるいは臨時に召役されるもの、雑工戸・鍛戸のように農閑期に官司において労役させられるもの、筥戸のように毎年一定の製品を貢納したものなどの形式があった。