When your child turns 18, the legal documents to put in place are a HIPAA authorization, a FERPA consent form, a healthcare power of attorney with an advance directive, and a durable financial power of attorney. Federal and state law treats an 18-year-old as a fully independent adult the moment the birthday arrives, which means you lose automatic access to their medical records, school records, bank accounts, and medical decision-making — even if they live at home and you pay every bill. Signing a short stack of papers before or just after the birthday keeps you able to help in a crisis.
Why Your Authority Ends on the Birthday
At 18, your child can sign binding contracts, consent to their own medical care, control their own financial accounts, and keep their records private from you. Hospitals, colleges, and banks will treat them as the only person with authority over their own information and decisions. None of that changes because you are still the parent, still claim them as a dependent, or still pay the tuition.
The practical fix is paperwork. Each document below closes one specific gap the birthday opens.
HIPAA Authorization for Medical Records
Once your child turns 18, healthcare providers cannot share test results, diagnoses, prescriptions, or treatment plans with you unless your child has given written permission. The HIPAA Privacy Rule treats your child as the sole person who controls access to their health information, and being on your insurance plan does not change that.1U.S. Department of Health and Human Services. When Your Child, Teenager, or Adult Son or Daughter Has a Mental Health Condition
A valid HIPAA authorization has to include specific elements under federal regulations: a description of the information to be shared, the names of the people authorized to receive it, the purpose of the disclosure, an expiration date or triggering event, and your child’s signature and date.2GovInfo. 45 CFR 164.508 – Uses and Disclosures for Which an Authorization Is Required Your child can revoke it in writing at any time.
There are narrow exceptions. If your child is incapacitated or facing a medical emergency, providers can use professional judgment to share information with family involved in their care. If your child is present and does not object, a provider can also discuss treatment with you informally.1U.S. Department of Health and Human Services. When Your Child, Teenager, or Adult Son or Daughter Has a Mental Health Condition In routine situations, though, the signed authorization is the only reliable way in.
FERPA Consent for Education Records
The Family Educational Rights and Privacy Act transfers control of education records to your child the moment they turn 18 or enroll in a postsecondary institution, whichever comes first. Grades, disciplinary files, and financial aid details then belong to the student alone.3Office of the Law Revision Counsel. 20 USC 1232g – Family Educational and Privacy Rights
Your child grants you access by signing a FERPA consent form, usually available through the college registrar’s office. The form should spell out which records you can see — transcripts, billing statements, financial aid packages — and name the people authorized to receive the information.
There is one exception many parents overlook. Schools may share education records with parents without the student’s consent if the student qualifies as a dependent for federal tax purposes.4U.S. Department of Education. Must Postsecondary Institutions Provide a Parent With Access to an Eligible Student’s Education Records Not every school applies that exception the same way, so a signed consent form on file is still the most reliable approach.
Healthcare Power of Attorney and Advance Directive
A healthcare power of attorney (sometimes called a healthcare proxy) lets your child name someone, typically a parent, to make medical decisions if they cannot communicate. An advance directive, often combined with the healthcare power of attorney in a single document, records your child’s wishes about specific treatments like life support, resuscitation, and organ donation.
Requirements for a valid advance directive vary by state. Most states require the document to be witnessed by one or two adults, notarized, or both. Common restrictions prevent the named agent, healthcare providers, or facility employees from serving as witnesses. Your child has to be mentally competent at the time they sign.
Durable Financial Power of Attorney
A durable financial power of attorney lets your child name an agent to handle money matters if they become incapacitated: paying bills, accessing bank accounts, filing taxes, managing investments. The word “durable” is the key. A standard power of attorney expires the moment the person becomes unable to make decisions, which is exactly when you need it most. A durable version stays in force through incapacity and remains effective until your child revokes it or passes away.
The scope can be broad or limited to specific transactions. State formalities vary, but most states require a notarized signature at a minimum.
What Happens Without These Documents
Without a healthcare power of attorney, decisions about your child’s medical care could fall to a hospital ethics committee or the treating physician rather than to you. Without a financial power of attorney, you cannot access your child’s bank account to pay their rent or manage their student loans, even in a genuine emergency.1U.S. Department of Health and Human Services. When Your Child, Teenager, or Adult Son or Daughter Has a Mental Health Condition
Your only recourse at that point is to petition a court for guardianship. That is a slow, expensive process that strips your child of most decision-making rights and can take weeks or months. The documents above cost very little to prepare and prevent that situation entirely.
Other Things to Handle Around the 18th Birthday
Selective Service Registration
Federal law requires every male U.S. citizen and male immigrant residing in the United States to register with the Selective Service System between the ages of 18 and 26.5Office of the Law Revision Counsel. 50 USC Chapter 49 – Military Selective Service The registration window opens 30 days before the 18th birthday and closes 30 days after, a 60-day period in total. As of 2026, the requirement applies only to males; proposals to extend it to all citizens have not been enacted.
The easiest way to register is online at sss.gov. Someone without a Social Security number can register at a U.S. Post Office or by mailing a printed form.6Selective Service System. Register Failing to register by age 26 permanently bars a person from federal student financial aid, federal job training programs, and most federal employment.7Office of the Law Revision Counsel. 50 USC 3811 – Offenses and Penalties Knowingly failing to register is also a federal crime punishable by up to five years in prison, a fine of up to $10,000, or both, though criminal prosecutions are rare.
Custodial Accounts (UTMA/UGMA)
If you set up a savings or investment account for your child under the Uniform Transfers to Minors Act or the older Uniform Gifts to Minors Act, the custodianship ends at the age specified by your state’s law. In roughly a dozen states that age is 18. In most states the default is 21, and a few states allow the custodianship to extend longer, up to age 25 in some cases. Some states also let the original donor pick a later termination age when the account is opened.
Once the custodianship terminates, your child gains full, unrestricted control. You can no longer withdraw funds, redirect investments, or approve transactions. The financial institution will typically require a government-issued ID or birth certificate to verify age, along with paperwork to convert the account into a standard individual account.
Tax responsibility shifts, too. The federal “kiddie tax” may still apply at 18: if your child’s unearned income (dividends, interest, capital gains) exceeds $2,700 in 2026 and their earned income does not cover more than half their own support, that investment income is taxed at the parent’s rate rather than the child’s.8Office of the Law Revision Counsel. 26 USC 1 – Tax Imposed If your child earns enough to cover more than half their own support, the kiddie tax no longer applies.
Credit Freeze and First Credit Check
Federal law gives every consumer, including a newly 18-year-old, the right to place a free security freeze on their credit reports to prevent unauthorized accounts from being opened. They can also request an initial fraud alert lasting at least one year if they suspect identity theft.9Office of the Law Revision Counsel. 15 USC 1681c-1 – Identity Theft Prevention; Fraud Alerts and Active Duty Alerts Identity theft against minors often goes undetected for years, so pulling your child’s credit report shortly after they turn 18 is a sensible first check.
One guardrail on new debt is worth knowing: under the Truth in Lending Act, a credit card issuer cannot open an account for anyone under 21 unless the applicant can show an independent ability to make the minimum payments or provides a cosigner who is at least 21.10Office of the Law Revision Counsel. 15 USC 1637 – Open End Consumer Credit Plans An 18-year-old with no income generally cannot get a credit card alone. Other debt, including car loans and private student loans, carries no similar age restriction, and cosigning makes you equally liable.
Getting the four core documents signed, filing the Selective Service registration on time, and spending a few minutes on the custodial account and credit report will cover the ground that matters most. If any of the documents need to reflect specific state formalities, an estate planning attorney can prepare the full set in a single short appointment.