15 C.F.R. § 15.25
(a) Service of notice.
(1) An authorized person shall send to the designated official a signed notice that includes:
(iv) Sufficient information identifying the officer to enable processing by the designated official. The following information is requested:
(5) Upon receipt of effective notice of delinquent support payments, together with all required supplementary documents and information, the designated official shall identify the officer from whom moneys are due and payable. The allotment shall be established in the amount necessary to comply with the support order and to liquidate arrearages if provided by a support order when the maximum amount to be allotted under this provision, together with any other moneys withheld for support from the officer, does not exceed:
(i) 50 percent of the officer's disposable earnings for any month where the officer asserts by affidavit or other acceptable evidence, that he/she is supporting a spouse and/or dependent child, other than a party in the support order. When the officer submits evidence, copies shall be sent to the authorized person, together with notification that the officer's support claim will be honored.
If the support claim is contested by the authorized person, that authorized person may refer this matter to the appropriate court or other authority for resolution.
(b) Disposable earnings. The following moneys are subject to inclusion in computation of the officer's disposable earnings:
(c) Exclusions. In determining the amount of any moneys due from or payable by the United States to any individual, there shall be excluded amounts which are:
(2) Required by law to be deducted from the remuneration or other payment involved, including, but not limited to:
(d) Officer notification.
(1) As soon as possible, but not later than 15 calendar days after the date of receipt of notice, the designated official shall send to the officer, at his/her duty station or last known address, written notice:
(2) The officer shall be provided with the following:
(4) If, within 30 days of the date of the notice, the officer has furnished the designated official affidavits or other documentation showing the information in the notice to be in error, the designated official shall consider the officer's response. The designated official may return to the authorized person, without action, the notice for a statutorily required support allotment together with the member's affidavit and other documentation, if the member submits substantial proof of error, such as:
(e) Absence of funds.
(f) Allotment of funds.