The bad debt write-off policy will affect unpaid invoices once they become 270 days old. In Short, invoices become eligible for bad debt write-off 9 months from the original invoice date. Therefore, to ensure that your invoices are not written off to bad debt expense, local units should be reviewing the status of their accounts on a regular basis. If prior to the write off, a local unit believes that an invoice will be collect in the near future, the local unit may request than an invoice remain open for an additional thirty days. These requests must be submitted to and approved by the Central AR office. Under no circumstances should local billing units re-bill an invoice previously charged to bad debt.