The below are the Important points
1. Install SQL Server 2012 featured installation with SharePoint Integrated mode (Install only)
If App server and WFE server is in a single box, then follow the steps 2 and 3
2. Install SQL Server 2012 SP1 featured installation option in "App server"
3. Choose the shared features "Reporting Services - SharePoint" and "Reporting Services Add-in for SharePoint products"
If App server and WFE server are in different box 4 to 6
4. Install SQL Server 2013 SP1 featured installation option in "App server"
5. Choose the shared features "Reporting Services - SharePoint" in "App server"
6. Choose the shared features "Reporting Services Add-in for SharePoint Products" in WFE server.
7. In app server (where we installed SSRS) you have to run the below power shell scripts
Install-SPRSService
Install-SPRSServiceProxy
get-spserviceinstance -all |where {$_.TypeName -like “SQL Server Reporting*”} | Start-SPServiceInstance
Note : SSRS in integrated mode (now as a service application) needs to be installed on the SharePoint server, not the SQL
Server.Also, with 2012, you should be installing the SP1 update in order to integrate with SharePoint 2013.








