Retirement Plan & Payroll Specialist; Part-Time, Onsite - Arlington, VA

The Retirement Plan & Payroll Specialist provides expert support for all aspects of retirement plan administration while ensuring accurate, compliant payroll processing. The incumbent will serve as the subject matter expert on 401(k), 457(b), 457(f), and Pension plans and will support payroll operations for salaried and hourly staff. This role requires strong knowledge of federal regulations, payroll processing, and retirement plan administration.

• Manage daily operations of 401(k), 457(b), 457(f), and Pension plans.
• Ensure compliance with ERISA, IRS, and other regulatory requirements.
• Coordinate plan audits, annual testing, filings (e.g., Form 5500), and employee communications.
• Serve as liaison with plan vendors, internal HR teams, and other stakeholders.
• Develop and maintain plan documentation and employee education materials.
• Support bi-weekly payroll processing, including verification of payroll data, benefit deductions, and tax with holdings.
• Prepare payroll reports and assist with audits or adjustments as needed.
• Communicate with tax agencies and vendors to resolve compliance issues.
• Triage and assign incoming HR tickets.
• Respond to retirement-related employee inquiries promptly and professionally.
• Deliver high-quality HR service while upholding organizational standards.