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Getting Started
6 min readBy The Stocks School Editorial Team

How to Start Investing With Just $100

You don't need thousands to begin. Here's exactly how to start investing with $100 — using fractional shares and low-cost ETFs — and why the habit matters far more than the amount.

"I don't have enough money to invest" is the most common reason people never start — and it is almost always wrong. Thanks to fractional shares, $100 is plenty to begin. What you build at $100 is the habit, and the habit is what makes you wealthy.

$100 is enough — here's why

A single share of some companies costs hundreds of dollars. You do not need a whole share. Fractional shares let you buy a slice of any stock or ETF for as little as $1.

You don't need a whole share — buy a fraction1 share ≈ $230$100= 0.43 of a share$100 can still buy:a slice of any pricey stocka whole low-cost ETF share11 companies at ~$9 each
Fractional shares let $100 buy a slice of even the priciest stocks — the habit matters more than the amount.

So your $100 can buy a piece of an expensive stock, a whole share of a low-cost ETF, or a little of several companies at once.

What to buy with your first $100

For most beginners, the simplest sensible first investment is a broad index ETF — one fund that holds hundreds of companies at once, so you are instantly diversified instead of betting on a single stock. It is low-cost, hands-off, and historically the market has returned about 10% a year over the long run.

The habit beats the amount

Here is the part that matters most: investing $100 once will not change your life — but investing a bit every month will. Putting in a fixed amount on a schedule (called dollar-cost averaging) removes the stress of timing and lets compounding do the work.

$10,000$8.9MThe longer you stay invested, the steeper compounding gets →
Compounding starts slow and ends spectacular — time does the heavy lifting.
  • $100/month at ~10% a year grows to roughly $20,000 in 10 years and ~$76,000 in 20 years.
  • You did not need to be rich. You needed to start and keep going.

Your first $100, step by step

  1. 1Open a brokerage account (most have no minimum and no commissions on stocks/ETFs).
  2. 2Move in your $100.
  3. 3Buy a fractional share of a broad index ETF.
  4. 4Set a small recurring amount — even $20–50 a month.
  5. 5Leave it alone and keep adding. See how to buy your first stock.
Bottom line: The biggest investing mistake is not picking the wrong stock — it is waiting until you "have enough." You already do. Start with $100, automate a little each month, and let time and compounding take over.

This is education, not investment advice.

The Stocks School Editorial Team

Written and reviewed by The Stocks School's editorial team — an independent, education-first stock-research platform. We check every guide for accuracy against primary sources and update it as the data changes. About us · How we research

Educational content only — not investment advice or a recommendation. Always do your own research and consult a licensed professional.