When you turn 18, what you can buy expands sharply because the law now treats you as someone who can sign a binding contract. That single change lets you open bank and brokerage accounts, apply for credit cards and loans, sign a lease, title a car, buy rifles and shotguns from a licensed dealer, purchase lottery tickets in most states, get a tattoo without a parent, book a hotel room, and form your own business. Alcohol, tobacco and vaping products, recreational cannabis, and handguns from licensed dealers still wait until 21.
Why 18 Is the Line
Before 18, most agreements you sign can be voided because minors generally lack the legal capacity to be held to them. Once you turn 18, every contract you sign is enforceable: apartment leases, cell phone plans, car financing, gym memberships, credit card agreements, brokerage account paperwork. If you stop paying or break the terms, the other side can take you to court. Nearly every “can I buy this now?” question comes back to that one shift.
What You Can Buy at 18
Rifles and Shotguns
Federal law allows anyone 18 or older to buy rifles and shotguns from a licensed firearms dealer.1Office of the Law Revision Counsel. 18 U.S. Code 922 – Unlawful Acts Handguns from a licensed dealer are a different story: the federal minimum there is 21. State laws can raise either floor further, and several do, so check your state before planning a purchase.
Lottery Tickets
Lottery tickets are available to 18-year-olds in most states. A handful set the bar at 19 or 21. Your state lottery commission’s website is the quickest way to confirm.
Tattoos
Every state requires the person getting tattooed to be at least 18 to consent on their own. Some states let minors get tattooed with parental permission; a few, including California and Arkansas, prohibit tattooing anyone under 18 regardless of consent.
Hotel Rooms
Most hotels will check in anyone 18 or older, since the booking is a contract you can now sign. Some properties in nightlife-heavy destinations set their minimum at 21, and resorts with all-inclusive alcohol packages often do the same. Call ahead if you’re unsure.
What’s Still Off-Limits Until 21
Alcohol is the big one. Every state prohibits selling alcoholic beverages to anyone under 21, and the federal government reinforces this by withholding highway funding from any state that allows it.2Office of the Law Revision Counsel. 23 U.S.C. 158 – National Minimum Drinking Age
Tobacco and vaping products also require you to be 21. Federal law changed in December 2019, raising the minimum purchase age from 18 to 21 for all tobacco products, with no exceptions.3U.S. Food and Drug Administration. Tobacco 21
Recreational cannabis follows the same rule. Every state that has legalized recreational sales sets the minimum purchase age at 21. Medical cannabis is a separate program; some states issue medical cards to patients 18 and older, with qualifying conditions and application steps that vary by state.
Handguns from licensed dealers, as noted above, also stay restricted until 21.1Office of the Law Revision Counsel. 18 U.S. Code 922 – Unlawful Acts
Bank Accounts, Credit Cards, and Investments
At 18, you can open checking and savings accounts at any bank or credit union without a parent’s involvement.
Credit cards come with a catch. Federal law won’t let a card issuer approve you unless you either show independent income to cover the debt or get a cosigner who is at least 21.4Office of the Law Revision Counsel. 15 U.S. Code 1637 – Open End Consumer Credit Plans In practice, that means most 18-year-olds need either a job or a willing cosigner before an issuer will approve them.
Personal loans and auto loans also become available at 18, though lenders will scrutinize your credit history and income. With little of either, a cosigner with established credit often decides whether you’re approved. Federal student loans work on a separate track: there’s no minimum age for federal student aid itself, since eligibility ties to enrollment in an eligible program rather than your birthday.5Federal Student Aid. Adult Students Signing the promissory note is still a contract, though, so you need to be 18 or have a parent sign for it to bind.
Brokerage firms require you to be 18 to open an individual investment account in your own name, because the account agreement is a contract. The same goes for a Roth IRA: you need earned income and you need to be 18 to hold the account yourself. If a parent opened a custodial account for you earlier, control transfers to you once you reach the age of majority.
Cars, Leases, and Homes
You can purchase and title a vehicle in your own name at 18, and you can take out your own auto insurance policy. That policy will be expensive. Full coverage for an 18-year-old on a standalone policy averages roughly $600 per month, a reflection of the higher accident risk insurers assign to young drivers. Staying on a parent’s policy, if that’s an option, is almost always cheaper.
Signing a lease is now fully on you. Landlords can hold you to every term, including rent payments, maintenance responsibilities, and early termination fees. The practical hurdles are income verification and credit history, which most 18-year-olds are still building. A cosigner or guarantor can bridge that gap.
Nothing in the law prevents you from buying a home at 18. The obstacle is financial. Mortgage lenders typically want at least two years of stable income and a solid credit score, and most 18-year-olds haven’t had time to build either. Buying without significant family help or savings is rare at this age.
Rental Cars
Renting a car at 18 is technically possible but comes with real limits. Most major rental companies set their minimum age at 20 or 21, with a few allowing 18-year-olds in select states. Even where you can rent at 18, expect a young-renter fee of $25 to $65 per day on top of the rental rate, and luxury vehicles are typically off-limits until 25.
Starting a Business
Contract capacity at 18 also opens the door to business ownership. You can form an LLC, register a sole proprietorship, or incorporate a company. Several states specifically require the person filing formation documents to be at least 18, and even in states without an explicit age rule, you’ll need to be 18 to serve as a registered agent or sign the operating agreement. State filing fees for forming an LLC range from about $35 to $500, depending on where you file.
Professional licensing follows a similar pattern. Fields like real estate, insurance, and cosmetology typically set 18 as the minimum age to apply for a license, though you’ll still need to complete the required education and pass an exam. You can start the education requirements before 18 and apply for the license itself as soon as you’re eligible.
One thing worth keeping in mind: turning 18 does more than change what you can buy. It also makes you eligible for jury duty, requires Selective Service registration for most men within 30 days of your birthday,6Office of the Law Revision Counsel. 50 U.S.C. 3802 – Registration and means that if you’re charged with a crime, you’ll be prosecuted in adult court in nearly every state.7Office of Juvenile Justice and Delinquency Prevention. Age Boundaries of the Juvenile Justice System The same contract power that lets you sign a lease also lets you be sued for breaking it.