Is zakat obligatory on an amount of 600 Kuwaiti Dinars deposited in the bank since June 2006, knowing that a portion of it will be spent later, and how is zakat calculated on the remaining amount? And what is the nisab of gold upon which zakat becomes obligatory, and is zakat obligatory on gold that has not been used for more than a year, but the wife will use it during an upcoming holiday?

Zakat (definition) is not obligatory on saved money unless it reaches the nisab (definition) (minimum threshold) and a hawl (full lunar year) passes over it. The hawl is calculated from the time the money reaches the nisab (85 grams of gold or 595 grams of silver). It is stipulated that the amount must not decrease during the hawl. As for the wife's jewelry, there is no Zakat on it if it is less than the nisab (80 grams). If it reaches the nisab and is used for adornment, it is more prudent to pay Zakat on it, though it is not obligatory according to the more preponderant opinion.