The First 5 Things You Should Do Financially When You Turn 18

Turning 18 unlocks a bunch of financial doors that were closed to you as a minor. You can open your own bank accounts, sign contracts, build credit in your own name, and invest without needing a parent's signature on everything. Most 18-year-olds walk through none of these doors because nobody tells them they're open.

I'm 17 and I've been planning for this. Here's the exact financial checklist I'm working through — in order of priority — and why each one matters.

1. Open your own bank accounts

As a minor, your bank accounts were probably custodial — a parent's name on everything. At 18, you can open accounts entirely in your own name, and you should.

Checking account: Your daily spending account. Pick a bank with no monthly fees, no minimum balance, and a good app. Most online banks and credit unions fit this. If your current teen account works fine, you can keep it — just make sure it converts to an adult account without fees.

High-yield savings account: If you don't have one already, open one now. Marcus, Ally, Capital One 360, Discover — any of them. This is where your emergency fund and short-term savings live, earning 4-5% instead of the 0.01% your regular bank pays.

The reason this is step one: every other step on this list requires having bank accounts in your own name. Get this done first so the rest is smooth.

2. Open a Roth IRA

This is the single most valuable financial account for a young person, and at 18 you can open one without a parent. If you have any earned income from a job, you're eligible.

Open one at Fidelity (easiest for beginners, no minimums, great app) or Schwab. Deposit whatever you can — even $50. Buy a total market index fund like FXAIX or VTI. Set up automatic monthly contributions.

I've written an entire post about Roth IRAs, but here's the one-line version: you pay taxes now while they're low, your money grows tax-free for decades, and you never pay taxes on the growth. Starting at 18 instead of 28 could mean hundreds of thousands of extra dollars by retirement. The math is not subtle.

If you had a custodial Roth IRA, it should automatically convert to a regular Roth IRA at 18 (or 21 depending on your state). Confirm with your brokerage that this happened and that the account is now in your name alone.

3. Get your first credit card

Your credit score starts building the moment you open your first credit account. The earlier you start, the longer your credit history — which is 15% of your score and the one factor you literally cannot speed up.

Best options at 18 with no credit history:

A secured credit card — you put down a deposit ($200-$500) that becomes your credit limit. After 6-12 months of good behavior, most banks upgrade you to a regular card and return your deposit.

A student credit card — if you're heading to college, cards like the Discover It Student are designed for people with no credit history. No deposit needed, and they often have cash back rewards.

The rules are non-negotiable:

• Use it for one or two small purchases per month

• Pay the full balance every month, always

• Set up autopay for the full statement balance

• Keep usage under 30% of your limit

• Never carry a balance

Do this for one year and your score will be in the 700s. Two years and you'll likely be above 730. By the time you need to rent an apartment or finance a car, your credit will be solid.

If you were an authorized user on a parent's card, keep that account open — the history stays on your file and adds to your credit age. Just add your own card on top of it.

4. Start building your emergency fund

If you don't already have one, start now. The goal for a young adult just starting out: $1,000 minimum, ideally working toward $2,000-3,000 as your expenses grow.

This money goes in your high-yield savings account (from step 1) and exists for one purpose: catching you when something unexpected happens. Car repair, medical bill, sudden expense, job loss. Without it, every unexpected cost becomes either debt or a drained investment account — both of which set you back.

At $50/week, you hit $1,000 in five months. At $100/week, ten weeks. Set up an automatic transfer on payday and let it build in the background.

This might seem less exciting than investing, but it's actually what protects your investments. Without an emergency fund, a $800 car repair means selling investments (possibly at a loss) or putting it on a credit card at 25% interest. With an emergency fund, it's an inconvenience, not a crisis.

5. File your taxes (and learn the basics)

If you had a job at any point during the year, you should file a tax return. Even if you earned under the standard deduction and technically don't "have to" file, you should because you'll likely get money back — any federal and state taxes withheld from your paychecks that you didn't actually owe.

Most teenagers and young adults with simple tax situations can file for free using IRS Free File, FreeTaxUSA, or Cash App Taxes. It takes 30-45 minutes and you need your W-2 (your employer sends this in January).

Beyond just filing, understand the basics: what gross vs net pay means, what FICA taxes are, what the standard deduction does, and why your Roth IRA contributions are so tax-efficient at your current low income. I've written full posts on all of this — understanding taxes early prevents expensive mistakes later and helps you keep more of what you earn.

The bonus moves (do these when the first five are solid)

Learn to cook. Not a financial account, but easily the biggest money-saving skill for a young adult. The gap between eating out and cooking is $200-400/month for most people. That's $2,400-4,800/year — or a maxed-out Roth IRA funded entirely by food savings.

Get renter's insurance. When you move into your own place, renter's insurance costs $10-20/month and covers your belongings if they're stolen or destroyed. Absurdly cheap for what it protects.

Register to vote. Not a financial move, but policies around taxes, student loans, minimum wage, and social programs directly affect your money. Having a voice in those decisions matters.

Look into a Health Savings Account (HSA) if applicable. If you end up on a high-deductible health plan (common for young adults), an HSA is a triple-tax-advantaged account — contributions are tax-deductible, growth is tax-free, and withdrawals for medical expenses are tax-free. It's the most tax-efficient account that exists.

Why the order matters

These five steps are sequenced deliberately:

Bank accounts first because everything else connects to them. Roth IRA second because the earlier it's open and funded, the more time compounds in your favor. Credit card third because it starts the credit-building clock. Emergency fund fourth because it protects everything you're building. Taxes fifth because it's annual and you need the others in place to maximize your tax position.

You don't have to do all five in one week. But doing all five within your first few months of being 18 puts you in a financial position that most people don't reach until their mid-twenties. That head start is worth more than any single investment you'll ever make.

The real birthday gift

Turning 18 isn't just about being a legal adult. It's the moment you get full control of your financial life — the ability to open accounts, build credit, invest, and make financial decisions entirely on your own.

Most 18-year-olds waste this moment because nobody tells them what's now available to them. You're not going to be one of them. Five steps, a few hours of setup, and you're building a financial foundation that your 25-year-old self will thank you for every single day.

Happy birthday. Now go open a Roth IRA.

More posts: [What Is a Roth IRA?], [How to Build Credit as a Teenager], [Emergency Funds for Teenagers], [How Taxes Work for Teenagers], and [High-Yield Savings Accounts]. Subscribe for a new post every week.