(a) For most employees who sustain a traumatic injury, the FECA provides that the employer must continue the employee's regular pay during any periods of resulting disability, up to a maximum of 45 calendar days. This is called continuation of pay, or COP. The employer, not OWCP, pays COP. Unlike wage loss benefits, COP is subject to taxes and all other payroll deductions that are made from regular income.

https://www.ecfr.gov/current/title-20/chapter-I/subchapter-B/part-10/subpart-C