An Instrument Proficiency Check (IPC) is required to act as Pilot in Command (PIC) under Instrument Flight Rules (IFR) if, within the preceding 12 calendar months, you have not performed, in simulated or actual instrument conditions:
six instrument approaches
holding procedures and tasks
intercepting and tracking courses through the use of navigational electronic systems
FAA Training Requirements
There are no specific training requirements outlined in FAR Part 61. However, a pilot seeking an IPC must perform a prescribed set of tasks to the standards outlined in the FAA Instrument Rating Airman Certification Standards (ACS).