diff --git a/server/app/cronjobs/aws-cost-aggregation/AWSResourceCostsAggregation.js b/server/app/cronjobs/aws-cost-aggregation/AWSResourceCostsAggregation.js
index 257661091..8fe204bc3 100644
--- a/server/app/cronjobs/aws-cost-aggregation/AWSResourceCostsAggregation.js
+++ b/server/app/cronjobs/aws-cost-aggregation/AWSResourceCostsAggregation.js
@@ -50,6 +50,7 @@ AWSResourceCostsAggregation.aggregateEntityCostsByOrg = aggregateEntityCostsByOr
 AWSResourceCostsAggregation.aggregateEntityCostsByProvider = aggregateEntityCostsByProvider
 AWSResourceCostsAggregation.aggregateEntityCostTrendByOrg = aggregateEntityCostTrendByOrg
 AWSResourceCostsAggregation.aggregateEntityCostTrendByProvider = aggregateEntityCostTrendByProvider
+AWSResourceCostsAggregation.aggregateResourceCostsForAllPeriods = aggregateResourceCostsForAllPeriods
 
 // AWSResourceCostsAggregation.execute()
 
@@ -206,8 +207,7 @@ function updateResourceCosts(provider, downloadedCSVPath, callback) {
             resourceService.getAllResourcesForProvider(provider, next)
         },
         function(resources, next) {
-            resourceService.updateAWSResourceCostsFromCSV(provider, resources, downloadedCSVPath,
-                AWSResourceCostsAggregation.currentCronRunTime, next)
+            AWSResourceCostsAggregation.aggregateResourceCostsForAllPeriods(provider, resources, next)
         },
         function(next) {
             AWSProvider.updateLastBillUpdateTime(provider._id,
@@ -223,6 +223,13 @@ function updateResourceCosts(provider, downloadedCSVPath, callback) {
     })
 }
 
+// Only aggregates monthly cost as of now and updates resource/instance collections
+// @TODO To be aggregated for all periods
+function aggregateResourceCostsForAllPeriods(provider, resources, callback) {
+    resourceService.aggregateResourceCostsForPeriod(provider, resources, 'month',
+        AWSResourceCostsAggregation.currentCronRunTime, callback)
+}
+
 function aggregateEntityCostsByOrg(orgs, callback) {
     // var catalystEntityHierarchy = appConfig.catalystEntityHierarchy
     var costAggregationPeriods = appConfig.costAggregationPeriods
diff --git a/server/app/model/resource-costs/resource-costs.js b/server/app/model/resource-costs/resource-costs.js
index 9a0761fd4..2c8f9a306 100644
--- a/server/app/model/resource-costs/resource-costs.js
+++ b/server/app/model/resource-costs/resource-costs.js
@@ -77,7 +77,7 @@ var ResourceCostsSchema = new Schema({
     },
     billLineItemId: {
         type: Number,
-        required: true,
+        required: false,
         trim: true
     },
     platformDetails: {
@@ -137,8 +137,6 @@ var ResourceCostsSchema = new Schema({
 })
 
 ResourceCostsSchema.index({'platformDetails.serviceId' : 1})
-ResourceCostsSchema.index({'organizationId': 1, 'providerId': 1, 'startTime': 1,
-    'billIntervalId': 1, 'billLineItemId': 1,  'interval': 1}, {'unique': true})
 
 ResourceCostsSchema.statics.save = function save(resourceCostData, callback) {
     var resourceCosts = new ResourceCosts(resourceCostData)
diff --git a/server/app/services/resourceService.js b/server/app/services/resourceService.js
index 20a38dafe..e9a54edc6 100644
--- a/server/app/services/resourceService.js
+++ b/server/app/services/resourceService.js
@@ -47,6 +47,7 @@ resourceService.getEC2InstancesInfo=getEC2InstancesInfo;
 resourceService.getAllResourcesForProvider =  getAllResourcesForProvider;
 resourceService.updateAWSResourceCostsFromCSV = updateAWSResourceCostsFromCSV
 resourceService.updateDomainNameForInstance = updateDomainNameForInstance
+resourceService.aggregateResourceCostsForPeriod = aggregateResourceCostsForPeriod
 
 // @TODO To be cached if needed. In memory data will not exceed 200MB for upto 2000 instances.
 function getAllResourcesForProvider(provider, next) {
@@ -193,10 +194,56 @@ function updateAWSResourceCostsFromCSV(provider, resources, downlaodedCSVPath, u
         if(err) {
             callback(err)
         } else {
-            callback()
+            callback(null, resources)
         }
     })
+}
+
+function aggregateResourceCostsForPeriod(provider, resources, period, endTime, callback) {
+    var catalystEntityHierarchy = appConfig.catalystEntityHierarchy
+    var date = new Date()
+    var billIntervalId = date.getFullYear() + '-' + (date.getMonth() + 1)
+
+    var offset = (new Date()).getTimezoneOffset()*60000
+    var startTime = dateUtil.getStartOfPeriod(period, endTime)
 
+    var query = { 'providerId': provider._id.toString() }
+    query.startTime = {$gte: Date.parse(startTime) + offset}
+    query.endTime = {$lte: Date.parse(endTime) + offset}
+
+    async.waterfall([
+        function(next) {
+            resourceCost.aggregate([
+                {$match: query},
+                {$group: {_id: "$" + catalystEntityHierarchy['resource'].key,
+                    totalCost: {$sum: "$cost"}}}
+            ],next)
+        },
+        function(resourceCosts, next) {
+            async.forEach(resourceCosts, function(resourceCost, next1) {
+                if(resourceCost._id in resources) {
+                    resources[resourceCost._id].cost = {
+                        aggregateInstanceCost: Math.round(resourceCost.totalCost * 100) / 100,
+                        currency:'USD',
+                        symbol:"$"
+                    }
+                    resources[resourceCost._id].save(next1)
+                }
+            }, function(err) {
+                if(err) {
+                    next(err)
+                } else {
+                    next()
+                }
+            })
+        }
+    ], function(err) {
+        if(err) {
+            callback(err)
+        } else {
+            callback()
+        }
+    })
 }
 
 function getCostForServices_deprecated(provider,callback) {
diff --git a/server/install.js b/server/install.js
index 06b7d6b7b..4e15ebef8 100755
--- a/server/install.js
+++ b/server/install.js
@@ -471,7 +471,7 @@ function getDefaultsConfig() {
                 key: 'platformDetails.region'
             },
             resource: {
-                key: 'resourceId'
+                key: 'platformDetails.instanceId'
             }
         },
         costAggregationPeriods: {