Requests for a 30 day filing extension must be received, in writing, prior to the April 1st filing date. May I ask where are persons hearing an extension is 30 days at a time?You may file Form IT204 or Form IT205 any time before the extension period ends. A renewal request letter from the employer stating reasons for the application, the position and the period of time required. Supporting Documents. After Substantial Completion, if Contractor shall neglect, refuse, or fail to complete the remaining Work within the. Application for Automatic Six-Month Extension of Time to File for Individuals IT-370. Your full Social Security number (SSN).