Is Zakat obligatory on a property purchased for investment purposes, the full price of which has not yet been paid?

Zakat is obligatory on real estate designated for trade if its value reaches the nisab and a full year has passed over it. As for real estate designated for rent, Zakat is not obligatory on its value, but rather on its revenue (rent) if it reaches theab and a full year has passed over it. Regarding debt related to real estate, it is deducted from the current value of the real estate when calculating Zakat.