45 CFR § 303.4 - Establishment of support obligations.
(a) When necessary, establish paternity pursuant to the standards of § 303.5;
(1) Taking reasonable steps to develop a sufficient factual basis for the support obligation, through such means as investigations, case conferencing, interviews with both parties, appear and disclose procedures, parent questionnaires, testimony, and electronic data sources;
(2) Gathering information regarding the earnings and income of the noncustodial parent and, when earnings and income information is unavailable or insufficient in a case gathering available information about the specific circumstances of the noncustodial parent, including such factors as those listed under § 302.56(c)(1)(iii) of this chapter;
(3) Basing the support obligation or recommended support obligation amount on the earnings and income of the noncustodial parent whenever available. If evidence of earnings and income is unavailable or insufficient to use as the measure of the noncustodial parent's ability to pay, then the support obligation or recommended support obligation amount should be based on available information about the specific circumstances of the noncustodial parent, including such factors as those listed in § 302.56(c)(1)(iii) of this chapter.
(4) Documenting the factual basis for the support obligation or the recommended support obligation in the case record.
(c) Periodically review and adjust child support orders, as appropriate, in accordance with § 303.8.
(d) Within 90 calendar days of locating the alleged father or noncustodial parent, regardless of whether paternity has been established, establish an order for support or complete service of process necessary to commence proceedings to establish a support order and, if necessary, paternity (or document unsuccessful attempts to serve process, in accordance with the State's guidelines defining diligent efforts under § 303.3(c)).
(e) If the court or administrative authority dismisses a petition for a support order without prejudice, the IV-D agency must, at the time of dismissal, examine the reasons for dismissal and determine when it would be appropriate to seek an order in the future, and seek a support order at that time.
(f) Seek a support order based on a voluntary acknowledgment in accordance with § 302.70(a)(5)(vii).