A rental self-service (“RSS”) computer system for enabling a policyholder of an automobile insurance policy to initiate an insurance replacement rental reservation after submission of an initial loss claim is provided. The RSS computer system includes a processor in communication with a memory. The processor is programmed to: (i) retrieve policyholder insurance data from an insurance provider database using a claim identifier associated with the initial loss claim submission, and a policyholder identifier associated with the policyholder; (ii) verify that the policyholder is eligible to receive an insurance replacement rental; (iii) cause to be displayed on a user device associated with the policyholder a searchable interface configured to enable the policyholder to search for at least one vendor location; (iv) receive a selected vehicle class inputted by the policyholder; (v) calculate a policyholder cost; (vi) display a cost summary; and (vii) receive confirmation of a rental reservation request.