AngularJS ng-include

HTML

<div ng-app ng-controller="Ctrl">
    <div ng-include src="'template.html'"></div>
</div>

<script type="text/ng-template" id="template.html">
    <input type="checkbox" ng-model="$parent.billing_is_shipping" ng-change="checked()"/>
</script>

JavaScript

function Ctrl($scope) {
    $scope.billing_is_shipping = true;
    
    $scope.checked = function(){
        console.log($scope.billing_is_shipping)
    }
}