بسم الله الرحمن الرحيم
(Fatwa: 1051/1064/M=9/1438)
The amount which is deducted forcefully from the salary each month and the same amount is added by the institution and deposited in the fund you may pay this amount to your wife as mahr. It is permissible according to Shariah. The ruling of interest will not be applicable on the additional amount.
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband
