Pennsylvania REV-1647 -- Schedule M — Future Interest Compromise (or “Schedule M”) is a form used by taxpayers in the state of Pennsylvania to compromise future interest owed on delinquent state taxes. This form is used when the taxpayer is unable to pay the full amount of interest due on the delinquent taxes and wishes to negotiate a lower amount with the Department of Revenue. This form is also used to waive or reduce fines and penalties. There are two types of Schedule M: “Regular” and “Automatic”. The “Regular” version requires the taxpayer to go through the normal application process, while the “Automatic” version can be used by taxpayers who meet certain criteria and do not need to submit an application.