Q: I have a morgage but used a sum of my savings to pay for the deposit. Would I need to pay zakaat on the deposit used?
A: Any money that was used up before the Islamic year ended (i.e. the 12 Lunar months) is exempted from Zakaat. So you need not pay zakaat on the deposit you paid towards your mortgage, for this is money already used and spent.
And Allah knows best
Mufti Siraj Desai