Supporting documents can be emailed to IndianaIRP@dor.in.gov or faxed to (317) 615-7310. Three months before your renewal date, you will receive an extension notice from the Indiana Revenue Department (DOR) containing mileage reports, extension plans, criminal information, etc. The following are required to renew your International Registration Plan (IRP) with LEP. Extensions are sent 60 days before payment expires. Pri renewals must be received by the IRP unit 30 days before payment due in order to prepare the tally. Full Calendar C for processing the following types of transactions: When transactions are processed online, all supporting documents must be sent to the Indiana Department of Revenue (DOR) within 20 days of the date of processing. Below, you`ll find specific IRP transactions and items required by DOR. You can now process extensions and online transactions that will provide you with a 24-hour service so you can process, pay for and print registration information for extensions and transactions without leaving your home or office.