A child marriage bill is legislation that sets a firm minimum marriage age of 18 and removes the exceptions — parental consent, judicial approval, pregnancy, and emancipation — that currently let younger teenagers marry in most states. Between 2000 and 2018, roughly 297,000 minors were legally married in the United States, about 96 percent of them 16 or 17 years old and roughly 78 percent girls married to adult men.1Journal of Adolescent Health. Child Marriage in the United States: Prevalence and Implications Reform bills have moved through statehouses steadily since 2018, and a federal bill introduced in 2024 now offers states money to fall in line. More than half the states still allow some form of minor marriage.
What a Child Marriage Bill Actually Changes
Reform bills vary in wording from state to state, but they tend to do the same four things.
A Flat Minimum Age of 18
The centerpiece is simple: no marriage license for anyone under 18. Parental consent stops working. Judicial approval stops working. Pregnancy stops mattering. Emancipation is no longer a workaround. Every earlier attempt to fix the system with procedural safeguards — better judicial standards, waiting periods, age-gap limits — proved easy to circumvent. A clean age floor removes the discretion that let abuses continue, and the administrative simplicity is itself part of the protection: clerks do not weigh consent forms, and judges do not evaluate ambiguous factors.
Voiding or Annulling Existing Underage Marriages
Bills address what happens to marriages already entered into by minors. Some states declare those marriages void from the start, with no legal effect. Others treat them as voidable, meaning the marriage stands unless the former minor asks a court to undo it, typically within a set window after turning 18. Voidable status gives the person the option to walk away without a full divorce.
Penalties for Officials Who Issue Illegal Licenses
Reform bills often add enforcement teeth aimed at county clerks and other officials who issue marriage licenses in violation of the age rule. Without them, a paper prohibition can be quietly undermined by a local office that skips age verification. Specific penalties differ, but the provision signals that the age floor is meant to be enforced rather than aspirational.
Closing the Marital Exception to Sex Offense Laws
This is the most uncomfortable piece. A majority of jurisdictions have historically allowed marriage as either a defense to statutory rape charges or as an exception that decriminalizes sexual acts between spouses that would otherwise be crimes based on the minor’s age. A Department of Justice review found 36 jurisdictions with one of those provisions on the books; twenty jurisdictions already had neither.2U.S. Department of Justice. Conflicts between State Marriage Age and Age-Based Sex Offense Laws Reform bills in the remaining states make clear that a marriage certificate cannot override criminal law protecting minors from sexual exploitation.
Why Closing the Exceptions Matters
The case for banning underage marriage outright is not only about preventing the ceremony. Once a minor is married, they land in a legal gap where they carry adult obligations but lack adult rights. In many jurisdictions a married minor cannot independently file for divorce, because the law still treats them as a person under legal disability who must act through a parent or guardian. That parent may be the one who arranged the marriage. Hiring an attorney is difficult because contracts signed by minors are generally voidable, and domestic violence shelters often cannot accept unaccompanied minors. School dropout rates among married minors compound the isolation.
Legislators have concluded that these downstream problems cannot be patched with better procedures at the marriage-license window. Removing the exceptions is the reform, because the exceptions are what created the trap.
Where States Stand in 2025
Marriage law is set state by state, so reform has advanced one legislature at a time. As of 2025, at least 16 states plus the District of Columbia have set the minimum marriage age at 18 with no exceptions at all. The first full bans passed in 2018, and the most recent additions include Maine, Missouri, and Oregon, all of which enacted 18-no-exceptions laws in 2025.
Other states have taken partial steps. Some raised the floor to 16 or 17 but kept judicial approval on top. Five states allow only court-emancipated 16- or 17-year-olds to marry, which puts them close to a full ban without quite closing it.
The gap between a full ban and a partial reform is not just symbolic. A 16-year-old exception with judicial approval leaves the same problems the reform movement is trying to address: a parent pressuring a child, a judge with insufficient guidance, and a minor without independent legal representation. A bright-line rule is what removes the room for a well-meaning exception to be misused.
The Federal Child Marriage Prevention Act
Because marriage law belongs to the states, federal legislation cannot directly ban child marriage nationwide. The Child Marriage Prevention Act of 2024 works through funding instead. States that prohibit marriage for anyone under 18 (or under the state’s age of majority, whichever is higher) become eligible for a boost of up to 10 percent of their average recent funding under two existing grant programs: the STOP Violence Against Women Formula Grant Program and the Sexual Assault Services Program. The bump lasts two years and can be renewed up to four times. Congress authorized $5 million a year for fiscal years 2027 through 2032 to pay for the incentives.3Congress.gov. S.4990 – Child Marriage Prevention Act of 2024
The Act also creates a National Commission to Combat Child Marriage in the United States to study the problem and produce recommendations. The grant funding is conditioned on the Commission delivering its interim report. The bill’s findings acknowledge the cross-state evasion problem directly, noting that the patchwork of state laws lets children be taken across state lines to jurisdictions with weaker protections.3Congress.gov. S.4990 – Child Marriage Prevention Act of 2024
The Cross-State Evasion Problem
An adult and a minor — or a parent and an adult partner — can travel from a state that bans child marriage to one that permits it, marry there, and return home. The longstanding default rule is that a marriage valid where it was performed is recognized elsewhere. That place-of-celebration rule means a marriage lawful in a permissive state can carry legal weight in a state that has banned child marriage.
Two things push back. Some states have marriage-evasion statutes that refuse to recognize out-of-state marriages entered into to dodge local law. And every state retains a public policy exception allowing courts to refuse recognition when an out-of-state marriage seriously violates state policy. That exception has historically been read narrowly, mostly reserved for cases like incestuous marriages, so it is not a reliable shield. The practical fix is universal: get every state to 18 so there is nowhere to evade to.
Immigration Consequences for Marriages Involving Minors
One consequence worth knowing about, because it is easy to miss: marriages involving minors face heightened scrutiny in the immigration system, even when they were legal where performed. When a spousal petition involves a spouse who was under 18 at the time of the marriage, USCIS evaluates whether the marriage was lawful in the place of celebration, whether it is consistent with the public policy of the state where the couple lives, whether the marriage is genuine, and whether the minor gave full, free, and informed consent.4U.S. Citizenship and Immigration Services. Chapter 6 – Spouses
Certain cases require an in-person interview: any petition where either spouse was under 16 at the marriage, or where one was 16 or 17 and the other was at least 10 years older.5U.S. Citizenship and Immigration Services. Adjudication of Family-Based Petitions If the place of celebration allowed the marriage only under conditions like parental consent, a court order, emancipation, or pregnancy, USCIS asks for evidence those conditions were actually met. A marriage that was technically legal where it was performed can still be denied recognition for immigration purposes if it conflicts with the public policy of the couple’s home state.6U.S. Citizenship and Immigration Services. Chapter 2 – Marriage and Marital Union for Naturalization As more states move to 18-no-exceptions, that public policy filter has more teeth.