Bulugh al-Maram #714

Ali (RAA) narrated that the Messenger of Allah (ﷺ) said: “When you possess two hundred Dirhams at the end of the year (if you still have all of them), five Dirhams are levied on them as Zakah. There is nothing upon you (to be paid) in gold, until it reaches (the value of) twenty Dinars. When you possess twenty Dinars, at the end of the year, then there is half a Dinar levied on it (as Zakah). Any additional amount will be calculated in the same manner. No Zakah is to be paid on monetary holdings, until they have been owned for one year.” Related by Abu Dawud, who rendered it Hasan.