The statute of limitations for paternity in California depends entirely on how parentage was established in the first place. The shortest clock is 60 days to rescind a Voluntary Declaration of Parentage. The longest commonly used clock is two years, which applies to challenging the marital presumption, challenging a voluntary declaration in court, and setting aside a paternity judgment. Miss the window that applies to your situation and the legal parent-child relationship becomes permanent, even against DNA evidence.
60 Days to Rescind a Voluntary Declaration of Parentage
If you signed a Voluntary Declaration of Parentage (VDOP) and want to undo it, you have 60 days from the date you signed to submit a Rescission Form (DCSS 0915).1California Courts. Cancel a Signed Voluntary Declaration of Parentage This is an administrative process that doesn’t require a court hearing. If you were a minor when you signed, the 60-day clock doesn’t start until you turn 18 or become emancipated, whichever comes first.
One exception shuts this door early: if a court case involving custody or child support already relies on the VDOP, the standard rescission form will not work and you have to go through the court instead. Once 60 days pass, rescission is gone. Your only remaining option is a court action to set aside the declaration, which has its own longer deadline and a heavier burden.
Two Years to Challenge the Marital Presumption
When spouses were living together at the time of both conception and birth, the child is conclusively presumed to be a child of the marriage.2California Legislative Information. California Code FAM 7540 “Conclusive” is close to what it sounds like. The presumption can only be rebutted in two narrow situations: the husband was impotent or sterile at the time of conception, or a party files a motion for genetic testing within two years of the child’s date of birth.3California Legislative Information. California Code FAM 7541
The husband, a presumed father, or the child acting through a guardian can bring the motion. After the second birthday, the door closes. A man who discovers five years into a marriage that the child is not biologically his has no path to undo the presumption. DNA evidence won’t reopen it. California law prioritizes the stability of the marital family over biological truth in this specific context, and courts enforce that strictly.
Two Years to Challenge a VDOP in Court
Once the 60-day rescission window has passed, challenging a Voluntary Declaration of Parentage requires a court action, and that action must be filed no later than two years after the declaration’s effective date.4California Legislative Information. California Code FAM 7577
Pay attention to which date starts the clock. The effective date is the date the form was filed with the California Department of Child Support Services, not the date the parents signed it.5California Legislative Information. California Code FAM 7573 Weeks or months can pass between signing at a hospital and the form actually being filed. If you are counting your deadline from the day you signed, you may be miscounting it.
Two Years to Set Aside a Paternity Judgment
If paternity was established through a court judgment, Family Code section 7646 controls. A motion to set aside the judgment requires genetic testing showing the established father is not the biological father, and it has to be filed within one of these windows:
- Two years from when the established father knew or should have known about the judgment establishing him as the father, or from when he knew or should have known about the paternity action, whichever came first.
- Two years from the child’s date of birth, if paternity was originally established through a Voluntary Declaration of Parentage that later became the basis for a judgment.
Section 7646 does not apply at all when the child is covered by the conclusive marital presumption.6Justia. California Code FAM 7645-7649.5 – Setting Aside or Vacating Judgment of Paternity Married fathers in that situation are stuck with the stricter two-years-from-birth deadline under section 7541, and the broader “knew or should have known” rule is not available to them.
“Reasonable Time” for Other Presumptions
California also recognizes several non-marital presumptions of parentage under Family Code section 7611, including the “holding out” presumption that arises when someone receives a child into their home and openly treats the child as their own.7California Legislative Information. California Code FAM 7611 These presumptions are rebuttable with clear and convincing evidence.8California Legislative Information. California Code FAM 7612
There is no numeric deadline for challenging a section 7611 presumption. Instead, the challenge must be brought within a “reasonable time” after the person learns facts that call the presumption into question. Courts evaluate reasonableness case by case, and waiting years after learning the truth will likely be fatal to the claim.
Meeting the Deadline Isn’t Always Enough
Filing on time gets you into court; it doesn’t guarantee the outcome. On a motion to set aside paternity, a judge weighs the child’s best interests alongside the biological facts. Relevant factors include the stability of the child’s existing relationship with the established father, whether the child would lose financial support or other benefits, and the emotional impact of severing the legal parent-child bond.
The longer a father-child relationship has existed, the harder it becomes to convince a court that undoing paternity serves anyone’s interests. A timely motion backed by conclusive DNA evidence can still be denied if the court concludes that the child’s welfare is better served by leaving the legal relationship intact.
What Happens When the Clock Runs Out
Once the applicable deadline passes, the legal parent-child relationship is locked in. The father retains the right to seek custody and visitation and remains obligated to pay child support. The child keeps access to the father’s health insurance, inheritance rights, and Social Security or veterans’ benefits that flow from the father’s status.
Child support obligations are not retroactive only to the date of the court’s order. They can reach back to the date the paternity petition was originally filed. A father who ignores a paternity action and later misses the window to challenge it can end up owing months or years of back support from the moment the case was initiated, with no way to reopen the question of whether he is actually the biological father.
If you are inside one of these windows and considering a challenge, the practical steps are the same across the different deadlines: confirm which method established paternity, identify which date starts your clock, arrange court-admissible genetic testing rather than a home DNA kit, and file before the window closes. A paternity index of 100 or greater from court-ordered testing creates a rebuttable presumption of parentage,9California Legislative Information. California Code FAM 7555 and refusing a court-ordered test allows the court to resolve the question against the refusing party.10California Legislative Information. California Code FAM 7551 After the deadline, none of that evidence matters.