The audit revealed just how costly this OT tab has become: The annual bill for overtime charged by postal employees grew 35% from $3.7 billion in 2014 to $5 billion last year. Over the course of those five years, workers charged for an average of more than 100 million OT hours per year, the report said. Overtime, according to the IG, now accounts for between 13% and 16% of USPS’ total costs.
