Alms Tax: Giving Zakat Without Disclosing It
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 1950
If a person gives something to a poor person with the intention of zakat, it is not necessary for him to tell him it is zakat. In fact, if the poor person is ashamed by taking zakat, it is recommended (mustaḥabb) that he give it to him with the intention of zakat but without disclosing to him that it is zakat.
-Ayatullah Sistani, Practical Laws of Islam, Alms Tax (Zakat)