Essential Functions: Ensures full compliance with U.S. federal, state, and local payroll tax regulations and Canadian federal/provincial payroll tax requirements, including oversight of withholding, calculation, and remittance for all tax types (FIT, SIT, FICA, FUTA, SUI, EHT, CPP, EI, QPP, etc.). Maintains and reconciles General Ledger payroll tax accounts and manages state, local, and Canadian provincial tax registrations, tax IDs, power-of-attorney documents, and agency account credentials.