22 Va. Admin. Code § 40-880-250
A. Either parent may request a review of the child support obligation once every three years. Additional requests may be made earlier by providing documentation that a material change of circumstance has occurred that potentially affects the child support obligation. Such changes shall be limited to the following:
5. A change of at least 25% can be documented by the requesting parent in the following circumstances:
§ 63.2-217 of the Code of Virginia; 42 USC § 651 et seq.
Derived from VR615-70-17 § 4.9, eff. February 28, 1990; amended, Virginia Register Volume 6, Issue 26, eff. October 24, 1990; Volume 7, Issue 15, eff. July 1, 1991; Volume 8, Issue 4, eff. July 1, 1992; Volume 8, Issue 19, eff. July 15, 1992; Volume 18, Issue 14, eff. April 24, 2002; Volume 23, Issue 20, eff. August 1, 2007; Volume 31, Issue 10, eff. February 12, 2015; Volume 41, Issue 19, eff. June 19, 2025.