Child support retroactivity: serve obligor within 90 days after filing to preserve retroactivity to filing date

90 days after date the petition, complaint, or other initial pleading was filed, under Cal. Fam. Code 4009.

Rule text

An original order for child support may be made retroactive to the date of filing the petition, complaint, or other initial pleading. If the parent ordered to pay support was not served with the petition, complaint, or other initial pleading within 90 days after filing and the court finds that the parent was not intentionally evading service, the child support order shall be effective no earlier than the date of service.

Cal. Fam. Code 4009, official source

Calculate this deadline

Deadline
Thursday, February 4, 2027
  1. Trigger (Date the petition, complaint, or other initial pleading was filed): Friday, November 6, 2026.
  2. Exclude the trigger day and count 90 calendar days: Thursday, February 4, 2027.
Rules applied
Cal. Fam. Code 4009
An original order for child support may be made retroactive to the date of filing the petition, complaint, or other initial pleading. If the parent ordered to pay support was not served with the petition, complaint, or other initial pleading within 90 days after filing and the court finds that the parent was not intentionally evading service, the child support order shall be effective no earlier than the date of service.
Official source
Cal. Code Civ. Proc. 12, 12a, 10; Cal. Rules of Court, rule 1.10 (applied in family law by Fam. Code 210)
CCP 12: "The time in which any act provided by law is to be done is computed by excluding the first day, and including the last, unless the last day is a holiday, and then it is also excluded." CCP 12a: "(a) If the last day for the performance of any act provided or required by law to be performed within a specified period of time is a holiday, then that period is hereby extended to and including the next day that is not a holiday. For purposes of this section, “holiday” means all day on Saturdays, all holidays specified in Section 135 and, to the extent provided in Section 12b, all days that by terms of Section 12b are required to be considered as holidays.(b) This section applies to Sections 659, 659a, and 921, and to all other provisions of law providing or requiring an act to be performed on a particular day or within a specified period of time, whether expressed in this or any other code or statute, ordinance, rule, or regulation." CCP 10: "Holidays within the meaning of this code are every Sunday and any other days that are specified or provided for as judicial holidays in Section 135." CRC 1.10(a): "The time in which any act provided by these rules is to be performed is computed by excluding the first day and including the last, unless the last day is a Saturday, Sunday, or other legal holiday, and then it is also excluded." CRC 1.10(b): "Unless otherwise provided by law, if the last day for the performance of any act that is required by these rules to be performed within a specific period of time falls on a Saturday, Sunday, or other legal holiday, the period is extended to and includes the next day that is not a holiday." Fam. Code 210: "Except to the extent that any other statute or rules adopted by the Judicial Council provide applicable rules, the rules of practice and procedure applicable to civil actions generally, including the provisions of Title 3a (commencing with Section 391) of Part 2 of the Code of Civil Procedure, apply to, and constitute the rules of practice and procedure in, proceedings under this code."
Official source
  • Not a dismissal deadline: if service is later, an original child support order runs only from the date of service (unless the obligor intentionally evaded service). roll none: conservative.
  • If the clerk's office is closed or inaccessible on the last day (weather, emergency or local closure orders), the deadline may be extended. Check local orders.

This calculator applies the cited rules to the dates you enter. It is not legal advice. Court orders, local rules, and case-specific facts can change a deadline; verify before relying on it. Rule set pending attorney review.

Worked example

Date the petition, complaint, or other initial pleading was filed on Monday, March 15, 2027, personal service: due Sunday, June 13, 2027.

  1. Trigger (Date the petition, complaint, or other initial pleading was filed): Monday, March 15, 2027.
  2. Exclude the trigger day and count 90 calendar days: Sunday, June 13, 2027.
  3. That day is a Sunday, but this date is fixed by the rule and does not move: Sunday, June 13, 2027.

Notes

Not a dismissal deadline: if service is later, an original child support order runs only from the date of service (unless the obligor intentionally evaded service). roll none: conservative.

Related deadlines

All California family law deadlines

Local rules by county

County local rules and courtroom procedures can add to or change this deadline. Pick a county to calculate with them applied.

Rules current as of 2026-10-23. Confirm against the official source and any local rule or court order before relying on a date. Rules changelog.