Yes, $100 Is Enough

The biggest myth in investing is that you need thousands of dollars to start. That hasn't been true for years. With fractional shares and zero-commission trading, you can own pieces of companies like Amazon, Microsoft, and Berkshire Hathaway starting with as little as $1.

What matters isn't how much you start with — it's that you start. Building the habit of regular investing will do more for your wealth than waiting for the "perfect" amount.

Step 1: Pick Your Broker

For beginners, the best broker is one with zero commissions, no account minimums, and a clean interface. Here are the standout options:

Fidelity — Best overall for beginners. Fractional shares, excellent research, no fees. Great customer service.
Charles Schwab — Similar to Fidelity. Strong research tools, fractional shares through Stock Slices.
Robinhood — Simplest interface, best mobile app. Great for visual learners. Fractional shares supported.
Vanguard — Best for long-term ETF investors. Owned by its fund shareholders, which aligns incentives.

Any of these will serve you well. Open an account in about 10 minutes — you'll need your SSN, a photo ID, and your bank account info for funding.

Step 2: Understand Fractional Shares

A single share of Amazon costs around $200. Without fractional shares, that would be out of reach for someone starting with $100. But with fractional shares, you can buy $20 worth of Amazon — owning 0.1 shares — and it works exactly the same way. If Amazon goes up 10%, your $20 becomes $22.

This is a game-changer. It means you can build a diversified portfolio with any amount of money.

Step 3: Your First $100 Portfolio

With $100, the best approach is to keep it simple. Here's a sensible allocation:

$70 in VTI (Vanguard Total Stock Market ETF) — Gives you exposure to essentially every US public company. Instant diversification across ~3,700 stocks.
$20 in VXUS (Vanguard Total International ETF) — Adds global diversification outside the US. Important because US stocks don't always outperform.
$10 in BND (Vanguard Total Bond Market ETF) — Small bond allocation for stability. Not exciting, but it smooths out the ride.

This three-fund portfolio is what many professional investors recommend as a starting point. You own thousands of companies across dozens of countries with just three ETFs.

Step 4: Automate and Forget

The most important step is the one you'll do forever: set up automatic investments. Most brokers let you schedule recurring transfers from your bank account on a weekly or monthly basis.

If you invest $100/month starting at age 25, earning 8% annually, you'll have roughly $350,000 by age 65. Wait until age 35 to start, and that drops to about $150,000. The early years matter enormously.

Common Mistakes to Avoid

Chasing hot stocks — The stocks everyone is talking about are usually the ones that have already gone up. You're buying high and hoping to sell higher. That's gambling, not investing.
Checking your portfolio daily — Watching your $100 fluctuate by $2 will drive you crazy. Check quarterly at most.
Waiting for the "right time" — There is no perfect time. The best time to start was 10 years ago. The second best is today.

Key Takeaways

$100 is more than enough to start — fractional shares eliminate the barrier.
A simple three-fund ETF portfolio (VTI + VXUS + BND) gives you global diversification.
Automate your contributions and stop looking at your balance. The habit matters more than the amount.