We said that the soundest among the schools regarding the issue of the lunar year is the Hanafi School, which holds that we calculate the Nisab at the beginning and end of the lunar year, and there is no consideration for the in-between periods. This means that if the wealth falls below the Nisab during the lunar year but reaches it by the end of the year, Zakat is due.
Money from a single source, such as a monthly salary, is not subject to a new lunar year every time it is received, as this would result in a new lunar year every week. Instead, it is added to other money from the same source, and Zakat is paid on the total amount, even if it was received before the end of the lunar year. This is our fatwa on the matter.
Fatwa by Dr. Khālid Naṣr