Security flaps for use with cash trays and cash trays including such security flaps are disclosed. An apparatus including a security flap, including: a first panel; a second panel; and a hinge, the first panel coupled to the second panel via the hinge, the second panel to be coupled to a cash tray, a spring to move the first panel between a first position where the first panel extends over and covers compartments of the cash tray and a second position where the first panel is spaced from the compartments of the cash tray, in either of the first position or the second position, the security flap is structured to deter a criminal act from occurring associated with an unauthorized individual accessing the compartments of the cash tray.