Is there any additional fee one would have to pay for the zakat they missed in past years?

There is no fee. One is recommended to make repentance and simply pay the Zakat on missed years, according to what was supposed to be paid. One must go back and calculate their Zakat based on their previous wealth, gold/silver prices, and applicable Nisab values. National Zakat Foundation provides a one-on-one service in this area.

Email zakat@nzfcanada.com to set up an appointment for missed Zakat calculations.