Ref. No. 995 Alif
In the name of Allah the Most Gracious the Most Merciful
The answer to your question is as follows:
Among husband and wife, whoever is the owner of Nisab i.e. 87.479 gram of gold or 612.360 gram of silver or cash equivalant to 612.36, Zakat becomes obligatory upon his / her wealth. If your wife owns the nisab then zakat is wajib on her and she must pay it. It is not husband’s duty to pay zakat of wife’s wealth. Nevertheless if husband, with wife’s permission, pays the zakat on behalf of his wife, it will suffice.
(And Allah knows best)
Darul Uloom Waqf Deoband