A stop-gap endorsement is an endorsement that is primarily used to provide employers liability coverage for work-related injuries arising out of exposures in monopolistic fund states (fund workers compensation policies do not provide employers liability coverage).
If the employer has operations in nonmonopolistic states, the endorsement is attached to the workers compensation policy providing coverage in those states. For employers operating exclusively in a monopolistic fund state, the endorsement is attached to the employer's general liability policy.