In most states, once you turn 18 your parents can ask you to leave, even if you’re still finishing high school. At 18 you’re a legal adult, and the general legal duty parents owed you as a minor — housing, food, day-to-day support — ends at the age of majority. There’s one significant exception: if your parents are divorced and a child support order is in place, the paying parent may still owe support until you graduate or hit a set age. Everything else about the situation, from health insurance to school records to finishing senior year, follows from that basic shift.
Why Turning 18 Changes the Relationship
In nearly every state, 18 is the age of majority. A small number of states set it at 19 or 21, but the vast majority draw the line at 18. Crossing that line makes you a legal adult who can sign contracts, consent to your own medical care, and make your own decisions. It also ends your parents’ legal duty to make decisions on your behalf, and in most states it ends their general duty to support you financially.
That’s the piece that catches families off guard. Plenty of 18-year-olds are still sitting in high school classrooms, still living at home, still eating their parents’ food and riding in their parents’ cars. The law doesn’t bridge that gap. Parents who keep providing housing and support through senior year are doing so voluntarily, not because they’re required to. And if they decide they’re done, an 18-year-old has no automatic legal right to demand they continue.
The Child Support Exception
If your parents are divorced and one pays child support, the rules change. Many states extend child support past 18 when the child is still in high school, most commonly until graduation or the child’s 19th birthday, whichever comes first. A few states allow support to continue longer, particularly for a child in higher education.
The details depend heavily on state law and on the specific language of the order. A support order that runs through high school graduation doesn’t disappear just because a parent decides they no longer want the child in their home. If you’re 18, still in high school, and there’s a support order in your family, it’s worth pulling the order and reading exactly what it says about the cutoff. A family law attorney or legal aid office can help interpret it. Parents in intact marriages generally have no equivalent obligation once you turn 18.
What Parents Still Control, and What They Don’t
The support duty ends, but so does much of your parents’ legal authority over you. The trade-off runs in both directions.
On the school side, the Family Educational Rights and Privacy Act transfers control of your education records from your parents to you at 18.1eCFR. 34 CFR 99.5 – What Are the Rights of Students After that, the school needs your permission to share grades, discipline records, or attendance with anyone, parents included. There’s an exception: schools may still share records with parents without your consent if you qualify as a tax dependent under Section 152 of the Internal Revenue Code.2eCFR. 34 CFR 99.31 – Under What Conditions Is Prior Consent Not Required Most 18-year-old seniors are still claimed as dependents, so this exception often applies, but the school has discretion and a student who formally objects can stop it.
You also gain the right to sign your own school documents and to make your own decisions about attendance. An 18-year-old can withdraw from high school without a parent’s signature. An 18-year-old can also refuse to be withdrawn — a parent who wants to pull you out against your will has no legal mechanism to force it.
On the medical side, HIPAA gives you full control of your health information at 18. A doctor or hospital won’t discuss your care with your parents unless you’ve signed a written authorization.3U.S. Department of Health and Human Services. Individuals Right Under HIPAA to Access Their Health Information That’s true even if your parents are still paying the bills and you’re on their insurance.
So the practical picture: your parents no longer have to house you, but they also no longer control your schooling, your medical care, or your records. It’s a genuine adult status, with the losses and the gains that come with it.
Insurance, Taxes, and Being Claimed as a Dependent
Being asked to leave doesn’t automatically knock you off your parents’ health insurance. Under the Affordable Care Act, children can stay on a parent’s health plan until age 26, regardless of student status, marital status, or financial independence. Whether to keep you on the plan is the parent’s choice, not a legal requirement, but the option exists nationwide.
On taxes, an 18-year-old can still be claimed as a qualifying child on a parent’s federal return. The IRS age test requires the child to be under 19 at year’s end, which an 18-year-old meets whether or not they’re in school.4Internal Revenue Service. Dependents The child must also live with the parent for more than half the year and not provide more than half of their own support. If your parents put you out partway through senior year, whether they can still claim you depends on how the year adds up against those tests.
In divorced families, only one parent can claim you. The custodial parent — the one you lived with for more nights during the year — has the default claim. A custodial parent who wants the other parent to claim the child instead has to sign IRS Form 8332 releasing the claim.5Internal Revenue Service. Form 8332 – Release/Revocation of Release of Claim to Exemption for Child by Custodial Parent
Finishing High School If You’ve Been Put Out
You do not need your parents’ consent or cooperation to stay enrolled. Once you’re 18, the school deals with you directly. You can sign your own attendance and activity forms, get your own records, and finish out senior year on your own signature.
The harder problem is often what comes after. If you’re heading to college, the FAFSA does not treat you as independent just because you’re 18 and living on your own. For the 2026–27 school year, you’re a dependent student on the FAFSA unless you were born before January 1, 2003 — you’d need to be at least 24. The narrow exceptions are being married, an active-duty service member or veteran, an orphan or ward of the court, an emancipated minor, or an unaccompanied homeless youth.6Federal Student Aid. Dependency Status Simply moving out and paying your own bills doesn’t count.
That creates a real bind: an adult by state law, with no right to parental support, but treated as a dependent for federal aid and expected to report parental income. Financial aid offices can sometimes use professional judgment to adjust a student’s dependency status in unusual circumstances, but it takes documentation and isn’t guaranteed. If you’re in this situation, talk to the financial aid office at the school you’re applying to as early as possible.
Where to Get Help
If you’re 18, still in high school, and dealing with a parent who wants you out — or a support order that isn’t being followed — legal aid organizations handle exactly these kinds of disputes for people who can’t afford a private attorney. That includes child support modifications, education record disputes, and housing issues. A family law attorney can also clarify the specific rules in your state, especially around whether child support extends past 18 and what any existing order actually requires. Many attorneys offer free or low-cost initial consultations, which is often enough to get straight answers on the questions that matter most.