In the USA there are relief organizations which collect zakat funds. They usually keep behind 10-12%
  • "In principle, the prerequiste for discharging zakaat is tamleek (making the needy owners of the zakaat). (Hidaayah)

    If a person hands over his zakat to the organization and the zakat gets used in the operating costs without making a needy person the owner his /her zakat will not be considered as discharged. Therefore people should be extremely cautious as to whom they hand over their zakat. And Allah Ta'ala Knows Best.
    The answer has been taken from various sources of scholars, academics and muslim inspire research team – and we do not verify its accuracy And Allah knows best."