The Fine Print of Turning 18
Contracts, credit cards, leases, HIPAA, doxing, FICA, and jury duty
Turning 18 is part yay, freedom, and part yikes, why did no one ever tell me this? I’m here to help you turn the ”yikes” into ”okay, I get it now.”
Quick disclaimer before we dive in: I'm a lawyer, but I'm not your lawyer. Laws vary state to state, and this is general education, not a substitute for legal advice for your specific situation.
Contracts Run Adult Life
Before you turned 18, the law gave you legal training wheels.
Up until now, if you signed something, you had a little escape hatch that said, "Okay, we'll cut you some slack while you're a minor.”
At 18, that escape hatch closes. Now, when you sign your name, the law assumes three things:
You understood what you were agreeing to.
You meant to agree.
You're responsible for what happens next.
So, let’s talk about some of the do’s and don’ts of signing one. Because you sign contracts way more often than you think you do. Apartment leases, credit card applications, and even those "click here to agree" boxes on your computer screen.
All of those are contracts.
The Good News:
Contracts are not just traps; they’re also one of the biggest ways the law protects you.
A good contract locks in what you're getting, spells out what happens if the other side flakes, gives you leverage if a company tries to change the deal or doesn't deliver, and gives you proof of what was promised.
And you’re allowed to say, “Can I see that in writing? Can I take this home and read it? Can you explain this part to me?” Those questions aren’t rude or embarrassing; they’re adult.
Handle Contracts Like a Boss
When someone hands you a contract and says, "Just sign here," ask yourself:
How long am I locked in? (What's the term?)
What am I getting?
What am I paying, and how often do I have to pay it?
How do I cancel if I need to?
What does it cost me if I want out early?
If the answer to one of those is "I have no idea," that's your sign to slow down.
You can literally say, "I'm not signing anything today; I'd like to read this first." If the person suddenly gets huffy or says the deal is only good if you sign right now, that is your BRIGHT red flag.
And remember, screenshots are your friend. Take a picture of that gym contract. Save a PDF of the lease on your phone.
Money, Credit, and the Interest Meter
If contracts are the promises, money is the part that makes those promises either sting or work for you.
At 18, you join what is dramatically called the “financial system.”
This means that all of a sudden, banks, credit card companies, and lenders find out you exist. (And they’re very, very interested in you.)
Glossy envelopes start arriving in the mail, addressed to you! (How adult!) All of them spell excitement and freedom, saying you’re "pre-approved,” you can get 0% interest for 12 months, and you can start earning rewards.
And none of those things are technically evil.
But it's incomplete because here’s what they don’t display on that shiny, official-looking envelope: interest.
So, if you put $500 on a credit card and don’t pay it off in full by the due date, the credit card company starts charging you a percentage. If your interest rate is 25% (not unusual), and you make minimum payments, that $500 iPad can turn into $625 or $700 over time.
“That zero interest for twelve months — if you don’t pay it off in time, a lot of those deals hit you with all the interest that would have been paid during the year, in one big chunk. Bastards.”
RULE OF THUMB:
Credit cards are a great tool only if you pay them off in full every month.
If you can’t, that interest meter starts running in the background while you’re none the wiser.
And the interest isn’t the only risk… This is just the sort of thing that wrecks young adults’ credit scores before they’ve even had the chance to need it. And your credit score is like your adult GPA, aka your financial reputation in one number.
Insurance, Tickets, and Cars
INSURANCE:
Every state requires some type of auto insurance.
But here’s the catch:
State minimums are usually really low. So, if your policy covers $25,000 in damage and you cause $80,000 worth of damage, the other driver can sue you personally for the extra $55,000.
That’s your money, your future wages, your stuff.
The cheapest possible insurance isn’t necessarily the best option.
Sometimes just an extra $10-$20/month buys way more protection.
TICKETS:
Tickets are now attached to your name.
So, if you blow it off, that's on you. And unpaid tickets can turn into warrants, as in, for your arrest.
“Just ask my sister, who got picked up on her way home from UT going to El Paso for Christmas, because a bounced check she wrote had turned into a warrant. My dad had to drive to Sierra Blanca, Texas to get her out of the clink. It was bad. Christmas was a little awkward that year.”
Your insurance company calls your moving violations, fender benders, and suspended licenses "points.” And in this game, points aren’t good.
Because the more points you have, the higher your insurance costs.
Keep the cost down by being safe on the road, not being in a hurry, certainly not drinking and driving, and taking care of tickets when they happen.
BUYING YOUR CAR:
Say you're buying a car from a stranger on Facebook Marketplace. You still don't own the car just because you have the keys and have paid for it.
Without the signed title, you don't really own the car in the eyes of the state.
SELLING YOUR CAR:
If you’re the one selling, here’s how you can protect yourself:
Take your plates off
File a transfer notice or release of liability with the DMV
Otherwise the system may still think you own that car, and when the next owner collects 20 toll tickets, guess whose mailbox they're coming to.
DRIVING FOR A DELIVERY OR RIDESHARE APP:
Your personal car insurance often does not cover you while you're on the clock unless you've added a special rider to your policy.
Your First Lease
Can you decide halfway through your lease that you're done? Your landlord may actually still charge rent until the lease ends or they find a new tenant.
You don't just get to ghost a lease.
What if you’re sharing a lease?
If your lease lists you and two roommates and you each plan to pay 1/3 of the lease, your landlord may collect 100% of the lease from whoever is easiest to get money from, unless your lease says otherwise.
So if one roommate quits paying and vanishes, and the second is broke, and you have a steady job, guess who the landlord is going to charge?
You don’t have to be scared of roommates, but you do need to choose carefully.
Decide in advance what happens if somebody wants to leave early. Roommate agreements help too, even simple ones that say, "If I bail early, I'll keep paying my share until we find someone else."
That's better than the awkward silence that usually comes from those situations.
The move-in move that saves you real money
Take photos and video of your place on move-in day (walls, floor, ceiling, fridge, stove, broken blinds, weird stains), all of it. Do it again when you move out, after your stuff is gone.
When it's time to get your security deposit back and the landlord claims you’ve damaged the apartment, your photos prove what was and wasn’t your fault.
Your Medical Privacy Is Now Yours
One of the most shocking "welcome to adulthood" moments for parents is this:
Once you're 18, your health information belongs to you. And that means it’s illegal for the hospital to share information about your medical situation (even with your parents) without your permission.
So how do you respect your privacy and give people you trust the ability to help you?
TWO SIMPLE DOCUMENTS:
A HIPAA release. This says who is allowed to get information about your medical condition. (Parents, a partner, a sibling, a trusted friend, whoever.)
A medical power of attorney. This says that if you’re too sick or injured to make your own healthcare decisions, this person or these people can decide for you. (Surgery, treatment options, end-of-life decisions, the big stuff.)
These forms are usually very simple. In many states you can get them for free or super low cost online from reputable sources. You don't need a lawyer to do the basic versions.
Your bonus document: a durable power of attorney.
A durable power of attorney lets someone you trust handle bills, accounts, your assets, your property, your life, and your business if you can't handle it. They can pay your rent, move money to cover expenses, and talk to your bank. Without it, your parents might have to go to court and ask a judge for guardianship over you, which is slow, stressful, and very expensive.
Remember: the Internet Never Forgets
Let me say it like a lawyer auntie who loves you: the internet never forgets.
Everything you do online: post, comment, DM, share, becomes something you are legally, personally, and morally responsible for.
Here are ways people get into legal trouble online:
Posting lies about someone that damage their reputation (that's defamation)
Harassing someone repeatedly with messages or threats (that can be criminal)
Sharing someone's private photos or intimate messages without consent (not only uncool, but is now a felony in many states)
Doxing, aka posting someone's address or private information to stir up harassment (also super illegal, even if the person was "just joking." The law doesn't think it's so funny)
There can be really serious consequences at worst; at best, there are practical consequences too.
Colleges look at your social media, employers Google you, and scholarship committees search your name.
“Here’s the golden rule I tell every teenager I love: would I be okay with this being read out loud to my grandmother, a judge, and my future boss? And if the answer is absolutely not — maybe keep it in the group chat. And even then, remember, screenshots are forever.”
Your First Paycheck (And Who the Heck is FICA?)
On your first day at a real job, you fill out forms, you might get a badge and a name tag, and eventually your first paycheck hits, and you think, who is FICA, and why did they take my money?
Among the forms you filled out was a W-4 (AKA: the "how much do I pay in taxes" form). It tells your employer how much federal income tax to withhold from every paycheck and pay to the IRS on your behalf.
On your pay stub, you'll see federal income tax, state income tax (unless you're in a no-tax state like Texas), and FICA taxes (FICA is technically two taxes in one: Social Security and Medicare).
Happy adulthood.
W-2 VS. 1099
When tax season rolls around, you'll get one of two forms. A W-2 means you're an employee. It shows how much you earned and how much tax was withheld, which functions as your tax cheat sheet for filing.
A 1099 is for gig workers, DoorDash, Uber Eats, Instacart, influencers, and freelancers.
If you get a 1099, no taxes were withheld. You're responsible for both halves of FICA, which together is actually called self-employment tax, roughly 15.3% of your income.
A tip if you’re earning 1099 income: set aside 20-30% of your income and don’t touch it until it’s time to pay.
Voting and Jury Duty
REGISTER TO VOTE:
Go to vote.gov.
It tells you how to register, how to check if you're already registered, where to vote, who's up for vote, and it has a whole section for newly minted 18-year-olds.
Your name, address, driver's license (or the last four of your social), and your birthday.
After you register, check your registration on your state's voter lookup page. It takes 10 seconds.
Voting is literally how you choose the people who decide the rules you'll have to follow. If the people making the rules don't look like you, don't listen to you, or don't understand your life, that's when things stop making sense.
JURY DUTY:
You get that jury summons in the mail. (And yes, you do have to reply.)
You may be dreading it, but guess what? Jury duty is the only time you get to directly decide how the law is applied to someone.
Judges interpret the law, lawyers argue the facts, but the jurors decide how the law and the facts intersect to produce a result. The jury is the guardrail between ordinary people and the power of the government, and it's not filled with legal experts on purpose.
“Every courtroom is a place where someone’s worst day is unfolding. When you serve on a jury, you’re stepping into a moment that matters. It may not be glamorous, but it is meaningful. Voting decides the game. Jury duty keeps the game fair. And both only work if people like you show up.”
Here Are a Few Non-Legal Adulting Tips
Try not to show up to someone else's house empty-handed for a dinner party
RSVP when you're invited to things.
If you borrow something, return it right after you use it, in better condition than when you found it.
Learn how to make one decent meal.
Small habits make a big difference.
🎙️ Listen to this episode of Life Is Legal wherever you get your podcasts. If you found it helpful, leave a review, subscribe, and share it with someone who needs to know this stuff.
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This post is for educational purposes only and does not constitute legal advice. Laws vary by state and situation. For advice specific to your circumstances, consult a licensed attorney in your area.
