Coordinate with assignees, mobility tax providers, Payroll, Finance, and Talent and Culture to maintain accurate assignment data, monitor deadlines and deliverables, resolve discrepancies, document approvals and exceptions, and ensure timely completion of tax-related activities. Establish roles, handoffs, escalation paths, documentation requirements, and service expectations; monitor performance and recurring issues; and lead corrective actions to promote consistent service delivery, clear accountability, data integrity, and timely resolution.