State laws differ as to fault and to negligence but in general you are likely to be found at fault since you backed into the vehicle. When a motorist backs or reverses into anther vehicle that driver is normally found at fault for not giving proper lookout.
To find out how the insurance companies involved will find fault, since in some states it can be divided up by each person’s perceived negligence i.e. 60/40, contact your insurance agent to place a claim.
If this accident or the claims resulting from it cause your rates to rise, start comparison shopping for new auto insurance here with us.