Q: Is it necessary to inform the person receiving Zakat that it is Zakat?
A: The 4 schools of jurisprudence are in agreement that it is not necessary to inform a recipient they are receiving Zakat when an amount is donated to them. In fact, some of the scholars such as Imam Ahmad Bin Hanbal (ra) disliked it if you tell a poor person the money given to them is Zakat.
And Allah knows best!
Mufti Billal Omarjee