DissoMaster was software used in California family law to calculate guideline child support and temporary spousal support. Published by Thomson Reuters under the CFLR name, it appeared in support calculations prepared by attorneys and courts for many years.

DissoMaster is discontinued

Thomson Reuters discontinued DissoMaster and the DissoMaster Suite effective March 31, 2025. The California Lawyers Association’s transition guide explains that the program would not be recertified beyond that date. Older case files may still contain DissoMaster printouts, but a historical printout should not be mistaken for a current support calculation.

The law behind the calculation

Family Code section 4055 sets out California’s statewide guideline child support formula. It uses the parents’ net disposable income and their respective parenting time, with adjustments specified in the statute. The software assists with applying that framework; the information entered and the governing law still matter.

Family Code section 3830 requires software used by courts to conform to Judicial Council standards. California Rules of Court, rule 5.275 supplies those standards, including calculation requirements, certification, renewal, and required information in the results.

Current alternatives

XSpouse is one current alternative. As checked October 23, 2026, the Judicial Council also lists Cal Support and CalSupport Pro, the California Child Support Guideline Calculator (DCSS), Family Law Software, and FamilySoft SupportCalc. Its current certification table identifies which programs are certified and when that certification expires.

In non-Title IV-D cases, the court, parties, and attorneys may use any Judicial Council-certified support calculator. Cases involving the local child support agency have a separate requirement: rule 5.275(j) generally requires the DCSS calculator, with the exceptions stated in the rule. A software name on an old worksheet is therefore not enough to establish that it is the appropriate calculator for a current proceeding.