How to Start Investing with $100

$100 is a real starting point, not 'too small'

It's a common myth that investing requires a large sum of money to 'get started properly.' In reality, the vast majority of US online brokers have a $0 account minimum, charge no commission on US stock and ETF trades, and support fractional shares — meaning you can buy a portion of a share for any dollar amount you choose.

This means $100 isn't a token amount you're parking until you have 'real money' — it's a genuine first investment that can begin compounding immediately. The bigger goal at this stage isn't the dollar amount, it's building the account, the habit, and the comfort with how investing actually works.

Step 1: Open a brokerage account

A brokerage account is simply the account that holds your investments — distinct from a bank account. Opening one online typically requires your name, address, Social Security number (for tax reporting), employment information, and a way to fund the account (a linked bank account).

For a first investment, a standard taxable brokerage account is the most flexible choice — you can withdraw money anytime (unlike retirement accounts, which have rules about early withdrawals). If your goal is specifically retirement savings, a Roth IRA is also worth considering from day one, since contributions can be withdrawn without penalty and qualified growth comes out tax-free in retirement.

Step 2: Decide what to buy with fractional shares

Without fractional shares, $100 wouldn't go far — a single share of some well-known companies costs hundreds or even thousands of dollars. Fractional share investing solves this: you specify a dollar amount (say, $100), and the broker allocates you that fraction of a share, down to very small decimals.

For a first investment, many beginners choose a broad-market ETF — a single fund that holds hundreds or thousands of underlying stocks — rather than picking individual companies. This spreads your $100 across a wide slice of the economy instead of betting on one company's outcome.

Step 3: Automate your next contributions

A single $100 investment is a starting point, not a finish line. Setting up an automatic recurring transfer — even something small like $25 or $50 every payday — turns investing into a habit rather than a decision you have to make (and potentially talk yourself out of) every month.

This approach, often called paying yourself first, also naturally implements dollar-cost averaging: you'll buy more shares when prices are lower and fewer when prices are higher, without needing to predict anything.

What to watch out for early on

Two things commonly trip up new investors with small accounts: trading too frequently (reacting to short-term price moves, which can rack up costs and tax complications even with 'free' trades), and keeping cash uninvested for too long out of fear of 'bad timing.'

For a long-term goal, time in the market generally matters more than the exact day you start. A small, simple, automated plan that you actually stick with tends to outperform a more 'sophisticated' plan that gets abandoned after a few weeks.

Frequently Asked Questions