What's the risk of running two payroll systems in parallel during an HRIS migration, and how is it managed?

A parallel run, processing payroll in both the old and new systems for at least one cycle before cutover, is a standard part of any complete HRIS migration. It's how you confirm the new system produces matching payroll output before it takes over as the system of record. Omni HR includes this validation step along with data auditing and a set go-live date, with rollback procedures available if something doesn't match before the first live payroll run.