Most people think you need thousands of dollars to start investing. You don't. $100 is enough to begin building real wealth, and thanks to fractional shares and zero-minimum brokerages, there has never been an easier time to get started.

In this guide, we'll walk you through exactly where to put your first $100, which account to use, and what to actually buy. Plain English, no finance degree required.

Can you really start investing with just $100?

Short answer: yes, absolutely. A decade ago, most brokerages required $1,000 or more just to open an account. Today, Fidelity, Schwab, and others let you start with $0. And fractional shares mean you can buy a slice of almost any stock or fund, even if a single share costs $500.

Roughly 37% of 25-year-olds now use investment accounts, up from just 6% a decade ago. Many of them started with less than $500. The barrier to entry isn't money. It's knowing where to start.

Step 1: Get your finances ready first

Before you invest a single dollar, make sure your financial foundation is solid. Investing with money you can't afford to lose is one of the most common beginner mistakes.

Do you have an emergency fund?

Before investing, make sure you have at least 1–3 months of living expenses sitting in a savings account. This protects you from having to sell your investments at a bad moment, like during a market dip, just to cover an unexpected bill.

Pay off high-interest debt first

Credit card debt at 20% APR is a guaranteed "investment" with a 20% return, simply by paying it off. Any debt above roughly 7–8% interest should be paid down before you invest. No stock market return reliably beats that.

Once you've checked both boxes, your $100 is genuinely ready to invest.

• Emergency fund in place (1–3 months of expenses)
• High-interest debt (above ~8%) paid down
• $100 available that you won't need in the next 3+ years

Step 2: Choose the right account for your $100

Where you invest matters almost as much as what you invest in. The right account type can save you thousands in taxes over the long run.

Roth IRA: the best account for most beginners

A Roth IRA is a retirement account where your money grows completely tax-free. You contribute after-tax dollars, and when you withdraw in retirement, you pay zero tax, not even on the gains. Fidelity and Schwab both offer Roth IRAs with no minimum balance. If you're under 50 and your income is below the limit (~$161,000 for single filers in 2026), this is your first stop.

Taxable brokerage account: most flexible

A regular brokerage account has no contribution limits and no withdrawal restrictions. Use this if you want access to your money before retirement age, or if you've already maxed out your Roth IRA for the year ($7,000 limit in 2026).

401(k): if your employer offers a match

If your employer matches 401(k) contributions, always contribute enough to get the full match before doing anything else. That match is an instant 50–100% return on your money. Nothing else comes close.

Step 3: Decide what to invest your $100 in

Now for the part everyone wants to know. Here's what actually makes sense when you're starting with $100.

Index funds and ETFs: the beginner default

An index fund or ETF is a single investment that holds dozens or hundreds of stocks at once. Instead of betting on one company, you own a tiny slice of the whole market. The S&P 500 tracks the 500 largest US companies and has returned an average of roughly 10% per year over the last century. Funds like VOO (Vanguard), FXAIX (Fidelity), or SPY (State Street) track it for next to nothing in fees.

Fractional shares: how to own big stocks with $10

Fractional shares let you buy a portion of a stock or ETF rather than a whole share. If a share of a company costs $400 and you only have $100, you can still buy a quarter share. Fidelity, Schwab, and Robinhood all support this. It's a great way to start building a portfolio without needing hundreds per share.

Robo-advisors: let the algorithm handle it

Services like Betterment and Wealthfront automatically invest your money, rebalance your portfolio, and optimize for taxes. They charge around 0.25% per year. On $100, that's 25 cents. A good option if you want to truly set it and forget it.

What to avoid with $100

Be honest with yourself about these: individual stocks (too risky when you're just starting), cryptocurrency (high volatility, not a beginner-appropriate first investment), and penny stocks (almost always a trap). Build your foundation first.

Step 4: Open your account and make your first investment

This is the step most people put off indefinitely. Don't. The whole process takes about 10 minutes.

1. 1
   Choose a broker Fidelity or Schwab for a Roth IRA; Robinhood or Webull for a simple brokerage account. All have no minimums and support fractional shares.
2. 2
   Create your account Takes about 5 minutes. You'll need your Social Security number and a government-issued ID.
3. 3
   Link your bank account Most brokers connect instantly via Plaid or similar. It takes 1–3 business days for the transfer to settle.
4. 4
   Transfer your $100 Initiate the transfer from within the brokerage app. It'll land in your account in 1–3 days.
5. 5
   Search for your fund Type the ticker symbol (VOO, FXAIX, or SPY for an S&P 500 index fund) in the search bar.
6. 6
   Place a market order For your first purchase, a market order is fine. Set the dollar amount to $100, confirm, and you're an investor.

Step 5: What to do after you invest your first $100

Set up automatic contributions

The most powerful thing you can do after your first investment is automate the next ones. Even $25 or $50 per month on autopilot adds up dramatically over time. Most brokers let you schedule recurring investments in seconds.

Don't check your portfolio every day

This is harder than it sounds. Markets move up and down constantly, and checking daily will make you anxious and tempted to sell when things dip. Set a reminder to review your portfolio once a month, and otherwise leave it alone.

Keep learning as you go

You don't need to understand everything before you start. Begin with the basics: what a stock is, how ETFs work, what risk tolerance means. Then build from there. Investing is a skill, and you get better over time.

How much could $100 grow over time?

Numbers make this real. Here's what $100 invested once and $100 invested monthly could look like at a 7% average annual return (a conservative estimate for an S&P 500 index fund):

The one-time $100 grows nearly 8× in 30 years. But $100 every month for 30 years becomes over $121,000. That's the power of consistency, not the size of your starting investment.

Common mistakes beginners make with their first $100

Frequently asked questions

Disclaimer: The Papermates is for educational purposes only and does not constitute financial advice. Some links on this page are affiliate links. We may earn a commission if you open an account through them, at no cost to you. We only recommend products we believe are genuinely useful for beginners.