Beginner Investing
Index Funds vs Mutual Funds: Which to Pick
A typical broad index fund might charge an expense ratio of about 0.03% to 0.20%, while an actively managed mutual fund often runs from roughly 0.50%...
How to Start Investing with $100 (2026 Guide)
In 2026 a new investor can open a broad index fund with as little as $100, and many brokerages now let you buy fractional shares down to $1. That means the old excuse of needing thousands to get started no longer holds water, though fees and behavior still matter far more than the size of your first deposit.
The honest truth is that starting with a small amount builds the habit that actually compounds. A person who invests $100 a month for years tends to learn more from the routine than from a single large lump sum dropped in on a lucky day.
Start with a single fund, not a wish list
The simplest path is a single broad index fund that tracks a large portion of the market. Instead of picking a dozen stocks, you own a slice of hundreds of companies through one purchase. This keeps your costs low and your decisions simple, which is exactly what a small account needs.
A common mistake is spreading $100 across ten different funds, which creates tiny positions that are hard to track and often duplicate each other. One well-chosen fund usually covers more ground than a messy collection.
Pick a tax-advantaged account before a taxable one
If you have earned income, a retirement account often makes sense as the first home for your money. The tax treatment varies, but the general idea is that growth inside these accounts is sheltered from annual taxes, which helps small balances grow faster over time.
Compare the two common flavors: a traditional account gives you a possible tax break now and taxes withdrawals later, while a post-tax account gives you no break upfront but typically lets withdrawals come out tax-free in retirement. One favors people who expect to be in a higher bracket later; the other favors those who want certainty about future taxes.
Automate the first $100 and forget the timing
Set up a recurring transfer so the money leaves your checking account before you can spend it. Behavior beats brilliance here: a steady habit of small buys outperforms a clever plan you abandon after two months.
- Open an account at a low-cost provider that accepts small opening balances.
- Choose one broad index fund with an expense ratio near the low end of the typical range.
- Schedule a monthly transfer of an amount you will not miss.
- Leave the account alone except to add more.
Why the low-cost route usually wins
Expense ratios often run from about 0.03% to over 1%, and on a small balance the difference is real money over a decade. Paying roughly 1% a year means giving up a meaningful slice of your return, while a near-zero fee keeps almost everything working for you.
The catch
Small accounts can still get eaten by account fees, and some providers charge a flat monthly fee that hurts a $100 balance far more than a $10,000 one. Watch the fine print for minimums, inactivity charges, and trading costs that quietly undo your head start.
Another trap is chasing last year's hot fund. A product that doubled recently can just as easily stall, and moving in and out racks up taxes and emotions. The boring fund you hold for years is usually the better teacher.
Keep your hands off the laptop
Once the plan runs, the biggest risk is tinkering. Checking the balance daily tends to invite panic selling during a normal dip. A quarterly glance is plenty for most small investors, and the boredom is a sign the strategy is working.
