5 CFR §630.501

1. (a)When an employee transfers between positions under subchapter I of chapter 63 of title 5, United States Code, the agency from which he transfers shall certify his annual leave account to the employing agency for credit or charge.
2. (b)When annual leave is transferred between different leave systems under section 6308 of title 5, United States Code, or is recredited under a different leave system as the result of a refund under section 6306 of that title, 7 calendar days of annual leave are deemed equal to 5 workdays of annual leave.