(g) Broadcasting Board of Governors will waive the collection of interest on the debt or any portion of the debt that is paid within 30 days after the date on which interest began to accrue. Broadcasting Board of Governors may extend this 30-day period, on a case-by-case basis, if it reasonably determines such action is appropriate. Broadcasting Board of Governors may also waive in whole or in part the collection of interest, penalties, and administrative costs assessed under this section per the criteria specified in part 103 of the Federal Claims Collection Standards (4 CFR part 103) relating to the compromise of claims or if the Board determines that collection of these charges is not in the best interest of the United States. Waiver under the first sentence of this paragraph is mandatory. Under the second and third sentences, it may be exercised under the following circumstances:

1. (1) Waiver of interest pending consideration of a request for reconsideration, administrative review, or waiver of the underlying debt under a permissive statute, and
2. (2) Waiver of interest where Broadcasting Board of Governors has accepted an installment plan under § 512.12, there is no indication of fault or lack of good faith on the part of the debtor and the amount of the interest is large enough, in relation to the size of the installments that the debtor can reasonably afford to pay, that the debt will never be repaid.