MONTHLY_SUMMARIES is the month to date summary toggle. If the MTD Summary toggle is checked, the pay close process (UPCLOZ) will create and store month-to-date totals. If the MTD Summary toggle is not checked, no month-to-date totals will be kept.
For Canadian Installations: MTD totals are required in order to store month-to-date totals required for the Canada Custom Revenue Agency (CCRA). All Canadian clients must keep Mtd information in order to retrieve the monthly information needed to do monthly remittance on the RPYEC report.