The Ruling on Calculating the Hawl for Paying Zakat on Unstable Wealth

Question
A bank account where a monthly salary is deposited, and this amount fluctuates, making it unclear how to calculate the hawl for paying zakat; since it is unstable, how is zakat calculated for this wealth?
Answer
I say, and with God's help: If the money reaches the value of 100 grams of gold, the threshold begins for you. At this time next year, if it is 100 grams or more, you must pay zakat; for a year has passed upon you, and God knows best.
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