Things You Can Legally Do at 18
Short answer
At 18, you legally become an adult in the United States and gain many new rights, freedoms, and responsibilities. You can vote, sign contracts, join the military, serve on a jury, make your own healthcare decisions, and more. This list of legal actions marks your transition into full legal independence.
What Are the Key Things You Can Legally Do When You Turn 18?
Turning 18 grants you a wide range of legal rights that were previously limited or unavailable. Here is a clear list you can reference immediately upon your 18th birthday:
- Vote in elections: Register and vote in local, state, and federal elections.
- Sign contracts: Enter legally binding agreements like rental leases, credit card applications, and employment contracts.
- Join the military: Enlist without parental consent.
- Serve on a jury: Be summoned and serve as a juror in court.
- Make healthcare decisions: Consent to medical or mental health treatments without a guardian.
- Marry without parental approval: Legally marry without needing parental permission.
- Apply for credit and loans: Open credit cards, take out loans, and build credit independently.
- Get a tattoo or piercing: Consent to body modifications.
- Register for Selective Service: If male, register for the draft within 30 days of turning 18.
- Buy tobacco products: Depending on state law (some states set this age higher).
- Open bank accounts: Without needing a co-signer.
- Be tried as an adult: In criminal cases, the court treats you as an adult.
For example, after turning 18, you can walk into a bank and say, “I would like to open a checking account in my name,” and do so without a parent present or co-signing. This highlights your legal independence.
How Do You Register to Vote and Why Does It Matter?
Voting is a fundamental right gained at 18. To register:
- Visit your state or local election office’s website or use the national voter registration portal.
- Provide your full name, date of birth, residential address, and a form of ID like a driver’s license number.
- Submit the registration before your state’s deadline—often 15–30 days before an election.
For example, you might say, “I’m registering to vote for the first time now that I’m 18.” Once registered, you can vote in the next election by showing your ID at the polling station.
Voting matters because it gives you a voice in choosing leaders and shaping laws that affect your daily life, such as education, jobs, and public safety. Not participating means missing out on influencing those decisions.
What Does Signing Contracts at 18 Entail?
Once you turn 18, you can legally enter contracts without needing a guardian’s consent. Common contracts include:
- Rental agreements for apartments or homes.
- Employment contracts or agreements for freelance work.
- Credit agreements for credit cards or loans.
- Mobile phone service contracts or subscriptions.
It is crucial to read every contract carefully before signing. For example, if renting an apartment, the landlord might say, “You will be responsible for paying $1,000 per month, with a security deposit of $1,000.” You can respond, “I understand and agree to these terms and will sign the lease today.” Remember, once signed, you are legally obligated to follow the contract terms.
If unclear, ask for clarification or consult a trusted adult or legal aid before signing.
How Does Military Enlistment Work at 18?
At 18, you can enlist in the U.S. military without parental permission. To do this:
- Contact a military recruiter from branches like the Army, Navy, Air Force, Marine Corps, or Coast Guard.
- Complete testing such as the Armed Services Vocational Aptitude Battery (ASVAB).
- Undergo physical and background screenings.
- Sign enlistment paperwork, which is a legal contract binding you to service terms.
For example, you might say, “I want to enlist now that I’m 18 and can sign the contract myself.” Military service obligations vary by branch and contract length, so ask recruiters detailed questions.
This right gives you the opportunity to serve your country, receive training, education benefits, and career skills.
What Healthcare Decisions Can You Make at 18?
At 18, you can make your own healthcare decisions, including consenting to treatments, surgeries, mental health services, and medications. You can also control who has access to your medical records.
If visiting a doctor after your 18th birthday, you can say, “I consent to this treatment and request that my medical information remain confidential.” Providers must respect your privacy unless there is a risk of harm to yourself or others.
This legal right means you no longer need a parent or guardian to approve or attend medical appointments. It’s important to understand your health insurance coverage and billing responsibilities as well.
What Does Jury Duty Mean at 18?
Turning 18 qualifies you to be called for jury duty. This means you might be summoned to:
- Participate in jury selection to serve on trial juries.
- Hear evidence and testimony in a court case.
- Deliberate and reach a verdict based on the law and facts presented.
For example, if you receive a jury summons, you should respond as instructed. You might say, “I received my summons and will appear as required.” Ignoring a jury summons can result in legal penalties.
Serving on a jury is a civic duty and an opportunity to participate directly in the justice system.
What Are the Limits and Exceptions After Turning 18?
Although you gain many rights, some legal restrictions remain:
- Drinking alcohol: The legal age is 21 nationwide.
- Renting a car: Many companies require renters to be at least 21 or 25.
- Purchasing firearms: Federal and state laws regulate firearm purchases with age and background checks.
- Driving laws: Some states have graduated driver's licenses with restrictions for new drivers under 18.
- Tobacco: The federal minimum age for tobacco products is 21, but some state laws differ.
For example, even though you are 18, if you ask a liquor store clerk, “Can I buy beer today?” they will have to say no unless you are 21.
Understanding these exceptions avoids legal trouble and confusion.
What Legal Documents Should You Update at 18?
Once you turn 18, update or obtain the following documents:
| Document Type | What to Do | Why It Matters |
|---|---|---|
| State-issued ID or Driver’s License | Apply or renew with your current address | Proof of identity for contracts and voting |
| Voter Registration | Register or update your registration | Enables voting |
| Bank Accounts | Open or update to remove parental access | Financial independence |
| Health Insurance | Review coverage and privacy rights | Control over medical decisions |
| Selective Service | Register if you are male within 30 days | Legal requirement for draft eligibility |
| Social Security Info | Ensure you know your number and keep it safe | Important for employment and taxes |
For example, after turning 18, you might say at the DMV, “I’m here to get a state ID as an adult.” This helps ensure your documents reflect your adult status.
Frequently asked questions
Can I legally drink alcohol at 18?
No. The legal drinking age in the U.S. is 21 nationwide. You cannot buy or consume alcohol legally until you reach 21.
Am I required to register for the Selective Service at 18?
Yes. Male U.S. citizens and immigrants aged 18 to 25 must register for the Selective Service within 30 days of their 18th birthday.
Can I get a tattoo without parental consent once I’m 18?
Yes. At 18, you can legally consent to tattoos and piercings without needing parental permission.
Can I rent a car at 18?
Usually not. Most car rental companies require renters to be at least 21 or 25 years old. Check with the rental company for their policy.
How do I register to vote after turning 18?
Visit your state’s election website or local election office, complete the voter registration form with your ID details, and submit it before your state’s deadline.
Are there rights I lose when I turn 18?
Yes. For example, parents no longer have automatic access to your medical or school records. You are fully responsible for your legal and financial decisions.