The salary overpayment resulted because . The majority of employees are considered 'employed at will'.They or their employer can terminate them with or without reason (save for a few protected cases). In the event I leave employment with this agency, I authorize the overpayment balance to be deducted from my final payroll payment or terminal leave cashout. How do I request a refund? A. Fill out the Business Tax Refund Request form to request a refund from the City for an overpayment. Contact the Benefit Overpayment Collection Section at 1-800-676-5737 during normal business hours. We can help you with: Questions about your overpayment. Ombudsman Inquiry Form.