Is Zakat obligatory immediately upon receiving the advanced dowry (Mahr al-Mu'ajjal) if it reaches the nisab, or after a full year has passed on the remaining amount, and is the nisab for gold 85 grams of 24-karat?

The remaining deferred Mahr (dowry) is subject to Zakat if a year has passed while it is in one's possession and it reaches the Nisab (minimum threshold). The Nisab for currency is determined by the value of 85 grams of pure gold. Therefore, whoever possesses the equivalent of this value or more, and a year has passed while it is in their possession, Zakat becomes obligatory upon them. Whoever possesses less than that is not obligated to pay Zakat, unless they have trade goods that complete the Nisab.