The statute of limitations for paternity in California depends entirely on how parentage was established. You have 60 days to rescind a Voluntary Declaration of Parentage administratively, two years from the child’s birth to challenge the conclusive marital presumption, two years from a declaration’s filing date to challenge a VDOP in court, and two years to set aside a paternity judgment under Family Code section 7646. Miss the applicable window and the legal parentage generally locks in for good, even when DNA later says otherwise.
60 Days to Cancel a Voluntary Declaration of Parentage
The shortest and most forgiving deadline belongs to parents who signed a Voluntary Declaration of Parentage and quickly changed their minds. Either parent can cancel the declaration by submitting a Rescission Form (DCSS 0915) within 60 days of signing.1California Courts. Cancel a Signed Voluntary Declaration of Parentage It is an administrative process, not a court case. No hearing, no judge, no burden of proof beyond filing the form on time.
Two wrinkles matter. If you were a minor when you signed, the 60-day clock does not start until you turn 18 or become emancipated, whichever comes first. And if a court case involving custody or child support already relies on the declaration, the standard rescission form will not work; you have to go through the court instead.
Once 60 days pass, rescission is gone. Your only remaining path is a court action to set aside the declaration, and that comes with a longer deadline but a higher burden of proof.
Two Years to Challenge a VDOP in Court
After the 60-day rescission window closes, a court action to challenge a Voluntary Declaration of Parentage must be filed no later than two years after the declaration’s effective date.2California Legislative Information. California Code FAM 7577 The effective date is when the form was filed with the California Department of Child Support Services, not when the parents signed it.3California Legislative Information. California Code FAM 7573 Weeks or months can pass between the two events, so check the filing date rather than assuming.
Two Years to Challenge the Marital Presumption
Married parents face the strictest rule in California paternity law. 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.4California Legislative Information. California Code FAM 7540 “Conclusive” is close to literal. Only two narrow exceptions let anyone push back: the husband was impotent or sterile at the time of conception, or a motion for genetic testing is filed within two years of the child’s birth.5California Legislative Information. California Code FAM 7541
The husband, a presumed father, or the child through a guardian can bring the motion. After the two-year mark, the door closes. A man who discovers five years into a marriage that the child is not biologically his has no route to undo the presumption. DNA evidence will not reopen the case. The law prioritizes family stability over biological truth here, and courts enforce that strictly.
Two Years to Set Aside a Paternity Judgment
If paternity was established through a court judgment rather than a VDOP or a marital presumption, Family Code section 7646 governs how to undo it. The motion requires genetic testing showing the established father is not the biological father, and it must 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.
Section 7646 does not apply at all when the child is presumed to be a child of a marriage under the conclusive marital presumption.6Justia. California Code FAM 7645-7649.5 – Setting Aside or Vacating Judgment of Paternity Married fathers fall back to the two-years-from-birth deadline in section 7541.
Reasonable Time for Other Presumptions
California 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
The deadline for challenging a section 7611 presumption is not a fixed number of years. A 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, weighing how long the parent-child relationship existed, when the challenger learned the disputed facts, and what the delay cost the child. Waiting years after learning the truth will likely be fatal.
Deadlines Are Not the Only Hurdle
Meeting the statutory deadline gets you through the courthouse door. It does not guarantee you win. Courts weigh the child’s best interests alongside the biological facts when deciding whether to set aside paternity. A judge will consider 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.
In practice, the longer a father-child relationship has existed, the harder it becomes to convince a court that undoing paternity serves anyone. A timely motion backed by DNA results can still fail on equitable grounds. That reality pushes toward acting as soon as you have reason to question paternity, not waiting until the last month of the statutory window.
Genetic Testing and What Refusal Costs You
Nearly every challenge to paternity requires genetic testing. The court can order the mother, the child, and the alleged parent to submit to testing on its own initiative or at any party’s request.9California Legislative Information. California Code FAM 7551 Results producing a paternity index of 100 or higher trigger a rebuttable presumption of parentage.10California Legislative Information. California Code FAM 7555
Refusing a court-ordered test does not stop the case. The court can resolve the parentage question against the refusing party, treat the refusal as admissible evidence, and hold the party in contempt.9California Legislative Information. California Code FAM 7551 Home DNA kits sold online are cheaper than court-admissible tests but generally cannot be used as evidence because they lack the chain-of-custody safeguards courts require.
Establishing Paternity in the First Place
The deadlines above all address challenges to established parentage. California law does not impose the same kind of ticking clock on establishing paternity to begin with. A Voluntary Declaration of Parentage can be signed at the hospital at birth or later at a local child support agency, a county registrar, a Family Law Facilitator’s office, or a welfare office.11California Courts. Voluntary Declaration of Parentage A paternity action in court can be initiated by the mother, the alleged father, the child through a representative, or a government agency. Once filed, child support can be made retroactive to the date the paternity petition was filed, so delay carries its own costs even without a hard deadline.
Which Deadline Applies to You
Working out your deadline starts with how parentage was established:
- Signed a VDOP recently and want out: 60 days from signing to rescind administratively.
- Signed a VDOP more than 60 days ago: two years from the filing date to challenge in court.
- Married to the mother, living together at conception and birth: two years from the child’s birth to move for genetic testing, and no path after that outside impotence or sterility.
- Court judgment established paternity: two years from when you knew or should have known about the judgment or action, under section 7646, unless the marital presumption applies.
- Presumed parent under section 7611 (holding out, attempted marriage, post-birth marriage with additional steps): a “reasonable time” after learning the facts that call the presumption into question.
If your window is measured in weeks rather than years, act now. If it is measured in years, act anyway. Courts weigh delay against you even when the calendar still favors you, and the equitable factors that decide close cases tilt further toward the established parent-child relationship with every month that passes.