Clearly communicate timesheet policies and procedures to your employees. This includes explaining what information needs to be recorded, submission deadlines, and how to handle missed punches. Consider providing training on how to properly fill out timesheets. While immediate managers should regularly validate timesheets, conducting occasional random audits of timesheets can help deter time theft or inaccurate entries. Implement a system where timesheets need approval from a supervisor before being submitted for payroll processing. This adds an extra layer of verification.