How to Establish Paternity in Hawaii
Reviewed by DocDraft Legal Team · Hawaii · Last updated 2026-09-12
In Hawaii, establishing paternity means legally confirming a child's second parent so the child obtains support, custody and visitation, health coverage, inheritance, and benefits. As of January 1, 2026, Hawaii's parentage rules are set by the new Uniform Parentage Act at Hawaii Revised Statutes Chapter 584A, enacted by Act 298, Session Laws of Hawaii 2025, which replaced former Chapter 584. Unmarried parents who agree can sign a voluntary acknowledgment of parentage, filed with the Department of Health, which carries the same effect as a court order and can be rescinded within 60 days of signing. Two Hawaii rules are load-bearing. First, timing: where a child has a presumed parent, a proceeding to challenge that parentage must be commenced within 2 years of the child's birth, subject to a narrow exception where the parents never cohabited during the probable time of conception; where a child has no presumed, acknowledged, or adjudicated parent, a proceeding may be brought until the child turns 21. Second, the genetic-testing threshold: a person is rebuttably identified as a parent when testing shows at least a 99 percent probability of parentage, using a prior probability of 0.50, and a combined paternity index of at least 500 to 1 (HRS 584A-505). A spouse of the person who gives birth is a presumed parent, and that presumption may be rebutted only by clear and convincing evidence (HRS 584A-204). Attorney review of your situation is available through DocDraft.
Find out where you stand in Hawaii
Where are you in establishing paternity?
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How long do I have to establish paternity in Hawaii?
Under Hawaii's Uniform Parentage Act (HRS Chapter 584A), where a child has a presumed parent a proceeding to challenge that parentage must be commenced within 2 years of the child's birth. Where a child has no presumed, acknowledged, or adjudicated parent, a proceeding to adjudicate parentage may be brought until the child turns 21.
What is the marital presumption of paternity in Hawaii?
Under HRS 584A-204, a person is presumed to be a parent if married to the person who gave birth and the child is born during the marriage or within 300 days after it ends. That presumption may be rebutted only by clear and convincing evidence, or by a court decree naming another parent.
What genetic test result establishes paternity in Hawaii?
Under HRS 584A-505, genetic testing rebuttably identifies a person as a parent when the results show at least a 99 percent probability of parentage, using a prior probability of 0.50, together with a combined paternity index of at least 500 to 1. The identification can be rebutted by further genetic testing.
Who handles paternity cases in Hawaii?
The Hawaii Child Support Enforcement Agency helps unmarried parents establish parentage and support. A signed voluntary acknowledgment of parentage is filed with the Department of Health and carries the effect of a court order, while contested parentage is decided by the Family Court, which can order genetic testing.
Hawaii paternity law at a glance
As of January 1, 2026, Hawaii determines parentage under a new Uniform Parentage Act, HRS Chapter 584A, enacted by Act 298 of the 2025 session laws, which replaced former Chapter 584. Unmarried parents who agree establish parentage by signing a voluntary acknowledgment of parentage filed with the Department of Health, with a 60-day right to rescind. The distinctive timing rule sits in the marital presumption: a spouse of the birth parent is a presumed parent (HRS 584A-204), and a proceeding to challenge a presumed parent's parentage must be commenced within 2 years of the child's birth, while a child with no presumed parent can have parentage adjudicated until age 21. Genetic testing rebuttably identifies a parent at a 99 percent probability with a combined paternity index of at least 500 to 1 (HRS 584A-505), and the presumption yields only to clear and convincing evidence.
Establishing Hawaii parentage under the new Chapter 584A
Suppose a child is born in Hawaii in 2026 to a married couple, but another person believes they are the biological parent. Because the spouse is a presumed parent under HRS 584A-204, the challenger must generally act within 2 years of the child's birth to contest that parentage. They ask the Family Court to order genetic testing, and a result showing at least a 99 percent probability of parentage with a combined paternity index of at least 500 to 1 rebuttably identifies a parent (HRS 584A-505). The marital presumption itself yields only to clear and convincing evidence. Had the parents been unmarried and in agreement, they could have signed a voluntary acknowledgment of parentage, filed it with the Department of Health, and either could have rescinded within 60 days of signing. Attorney review is available through DocDraft.
Relevant Laws
HRS 584A-204 (presumption of parentage)
Provides that a person is presumed to be a parent if married to the person who gave birth and the child is born during the marriage or within 300 days after it ends, and that the presumption may be rebutted only by clear and convincing evidence or a court decree naming another parent.
HRS 584A-505 (genetic-testing threshold)
Provides that genetic testing rebuttably identifies a person as a parent when the results show at least a 99 percent probability of parentage, using a prior probability of 0.50, and a combined paternity index of at least 500 to 1.
HRS Chapter 584A (Hawaii Uniform Parentage Act)
Enacted by Act 298, Session Laws of Hawaii 2025, and effective January 1, 2026, replacing former Chapter 584. It sets the time limits to adjudicate parentage, including the 2-year limit to challenge a presumed parent, the effect of a voluntary acknowledgment of parentage, and the 60-day right to rescind.
Hawaii Child Support Enforcement Agency
The Child Support Enforcement Agency helps unmarried parents establish parentage through the voluntary acknowledgment of parentage, which is filed with the Department of Health, and can open a case to establish and enforce support.
Regional Variances
Hawaii paternity rules at a glance
Governing law
Since January 1, 2026, parentage is set by the new Uniform Parentage Act, HRS Chapter 584A, enacted by Act 298 of the 2025 session laws, replacing former Chapter 584.
Voluntary path and where it is filed
Unmarried parents establish parentage by signing a voluntary acknowledgment of parentage filed with the Department of Health, which carries the force of a court order, with help available from the Child Support Enforcement Agency.
Rescission window
Either signer may rescind the acknowledgment within 60 days of signing, or before a judicial or administrative proceeding relating to the child if earlier. After that it can be challenged only for fraud, duress, or material mistake of fact.
Marital presumption and deadline
A spouse of the person who gave birth is a presumed parent (HRS 584A-204); a proceeding to challenge a presumed parent's parentage must be commenced within 2 years of the child's birth.
Deadline where no presumed parent exists
Where a child has no presumed, acknowledged, or adjudicated parent, a proceeding to adjudicate parentage may be brought until the child turns 21.
Genetic-testing threshold
Genetic testing rebuttably identifies a parent at a 99 percent probability of parentage, using a prior probability of 0.50, with a combined paternity index of at least 500 to 1 (HRS 584A-505).
Suggested Compliance Checklist
Confirm whether a presumed parent exists
Before signing or filing anything days after startingDetermine whether the person who gave birth was married when the child was born or within 300 days before, which makes the spouse a presumed parent (HRS 584A-204). If so, a proceeding to challenge that parentage generally must be commenced within 2 years of the child's birth.
Get genetic testing if biological parentage is uncertain
Before signing an acknowledgment days after startingBecause a signed acknowledgment has the force of a judgment, obtain genetic testing first if there is any doubt. Under HRS 584A-505, results of at least a 99 percent probability and a combined paternity index of at least 500 to 1 rebuttably identify a parent.
Sign and file the voluntary acknowledgment of parentage
At the hospital or a local office days after startingUnmarried parents who agree sign the acknowledgment and file it with the Department of Health, where it carries the force of a court order of parentage. Keep a copy. Attorney review of your paternity matter is available through DocDraft.
Track the 60-day rescission window
Within 60 days of signing days after startingIf you need to cancel a signed acknowledgment, rescind within 60 days of signing, or before a judicial or administrative proceeding relating to the child if that is earlier. After 60 days it can be undone only for fraud, duress, or material mistake of fact.
File a parentage action in Family Court if parents disagree
Within the applicable limitation period days after startingIf parents do not agree, ask the Child Support Enforcement Agency to open a case or file a proceeding to adjudicate parentage in the Family Court under HRS Chapter 584A. Where a presumed parent exists, act within 2 years of the child's birth.
Keep records of the acknowledgment, testing, and orders
Ongoing days after startingSave copies of the signed acknowledgment, any genetic-test results, and court papers, and calendar the 60-day rescission window and any 2-year presumed-parent deadline so you do not miss a right-forfeiting date.
| Task | Description | Document | Days after starting |
|---|---|---|---|
| Confirm whether a presumed parent exists | Determine whether the person who gave birth was married when the child was born or within 300 days before, which makes the spouse a presumed parent (HRS 584A-204). If so, a proceeding to challenge that parentage generally must be commenced within 2 years of the child's birth. | - | Before signing or filing anything |
| Get genetic testing if biological parentage is uncertain | Because a signed acknowledgment has the force of a judgment, obtain genetic testing first if there is any doubt. Under HRS 584A-505, results of at least a 99 percent probability and a combined paternity index of at least 500 to 1 rebuttably identify a parent. | - | Before signing an acknowledgment |
| Sign and file the voluntary acknowledgment of parentage | Unmarried parents who agree sign the acknowledgment and file it with the Department of Health, where it carries the force of a court order of parentage. Keep a copy. Attorney review of your paternity matter is available through DocDraft. | - | At the hospital or a local office |
| Track the 60-day rescission window | If you need to cancel a signed acknowledgment, rescind within 60 days of signing, or before a judicial or administrative proceeding relating to the child if that is earlier. After 60 days it can be undone only for fraud, duress, or material mistake of fact. | - | Within 60 days of signing |
| File a parentage action in Family Court if parents disagree | If parents do not agree, ask the Child Support Enforcement Agency to open a case or file a proceeding to adjudicate parentage in the Family Court under HRS Chapter 584A. Where a presumed parent exists, act within 2 years of the child's birth. | - | Within the applicable limitation period |
| Keep records of the acknowledgment, testing, and orders | Save copies of the signed acknowledgment, any genetic-test results, and court papers, and calendar the 60-day rescission window and any 2-year presumed-parent deadline so you do not miss a right-forfeiting date. | - | Ongoing |
Frequently Asked Questions
Establishing paternity in Hawaii means legally confirming a child's second parent so the child obtains support, custody and visitation, health coverage, inheritance, and benefits. Under Hawaii's Uniform Parentage Act (HRS Chapter 584A) it is done by signing a voluntary acknowledgment of parentage or through a Family Court proceeding that adjudicates parentage.
Unmarried parents who agree sign a voluntary acknowledgment of parentage and file it with the Department of Health, where it carries the effect of a court order. If parents disagree, the Family Court adjudicates parentage under HRS Chapter 584A, usually after ordering genetic testing, and the Child Support Enforcement Agency can help.
It is a form that unmarried parents sign to establish a legal parent-child relationship without going to court. Once filed with the Department of Health it has the same effect as a court order of parentage. The Child Support Enforcement Agency can help parents complete and file it.
Where a child has a presumed parent, a proceeding to challenge that parentage generally must be commenced within 2 years of birth. Missing that window can lock in the presumed parent, except in narrow cases where the court finds the parents never cohabited during the probable time of conception.
A spouse of the person who gave birth is a presumed parent under HRS 584A-204. That presumption may be rebutted only by clear and convincing evidence, or by a court decree naming another parent, and any challenge to a presumed parent generally must be brought within 2 years of the child's birth.
Yes, within a limited window. Either signer may rescind the voluntary acknowledgment of parentage by filing within 60 days of signing, or before a judicial or administrative proceeding relating to the child if that is earlier. After 60 days it can be set aside only for fraud, duress, or material mistake of fact.
Not by itself. Under HRS 584A-505, testing showing at least a 99 percent probability of parentage and a combined paternity index of at least 500 to 1 rebuttably identifies a parent, but parentage is finalized by a signed acknowledgment or a Family Court judgment, not the lab report alone.
Since January 1, 2026, Hawaii's parentage rules are set by the new Uniform Parentage Act at HRS Chapter 584A, enacted by Act 298 of the 2025 session laws, which replaced former Chapter 584. It covers presumptions of parentage, voluntary acknowledgments, genetic testing, and court proceedings to adjudicate parentage.
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