When a client transfers an ignition interlock device from one vehicle to another vehicle, will that client have to pay the ADOT fee again?

The IISP will collect a fee ($20) for each new device and replacement device installed and will transmit those fees to ADOT on a monthly basis.  When the device is removed from one vehicle and installed in another vehicle, this is exactly how it should be reported (a removal and an install). Since the manufacturer would be reporting an install, the department will collect the ADOT fee.

Will the Service Arizona website show us a removal date since there is no interlock insignia on the license?

At this time the department is not making any updates to the current Service Arizona portal.   The current manufacturer Service Arizona website portal does not provide a removal date.  A Motor Vehicle Record (MVR) is accessible to the customer on the servicearizona.com website.  The MVR displays the ignition interlock requirement end date.  When validating a removal date from an MVR, ensure you are reviewing the most current document.  Any new violations reported to the department may have extended the original ignition interlock requirement.