Stocks represent partial ownership in a company, and buying even a single share makes you a shareholder with a claim on that company’s future profits. Before you invest, you need to understand what you’re actually buying, how the costs and taxes work, how to place trades, and how to manage the risk of losing money. Here’s what matters most.
What You’re Actually Buying
When you buy stock, you’re purchasing a small piece of a business. If the company grows and becomes more profitable, your shares typically become more valuable. If the company struggles, your shares lose value. That direct connection between company performance and your returns is the core of stock investing.
Most individual investors buy common stock, which comes with voting rights (usually one vote per share) on major corporate decisions like electing the board of directors. Common shareholders may also receive dividends, which are periodic cash payments from company profits, though companies aren’t required to pay them.
Preferred stock works differently. Preferred shareholders get paid dividends before common shareholders and have a higher claim on the company’s assets if it goes bankrupt. The tradeoff is that preferred stock usually carries no voting rights, and its price tends to move less dramatically, behaving more like a bond than a traditional stock. Most beginners will be buying common stock through a brokerage account.
How You Make (and Lose) Money
Stock returns come from two sources: price appreciation and dividends. If you buy a share at $50 and sell it at $70, that $20 gain is your capital appreciation. If the company also paid you $2 in dividends while you held it, your total return is $22 per share.
Losses work the same way in reverse. If you buy at $50 and the price drops to $35, you’ve lost $15 per share on paper. That loss only becomes real when you sell. This is the distinction between an “unrealized” loss (you still hold the stock) and a “realized” loss (you’ve sold). Stock prices can swing significantly in short periods, so you should only invest money you won’t need for several years.
What It Costs to Invest
The barrier to entry is lower than most people expect. Major brokerages like Fidelity and Charles Schwab have eliminated trade commissions, meaning you can buy and sell stocks and exchange-traded funds (ETFs) for $0 per trade. That doesn’t mean investing is completely free, though.
If you buy ETFs or mutual funds instead of individual stocks, you’ll pay an expense ratio. This is an annual fee expressed as a percentage of your investment, deducted automatically from the fund’s returns. A broad stock market index ETF might charge 0.03% to 0.10% per year, which works out to $3 to $10 annually on a $10,000 investment. Actively managed funds charge more, often 0.50% to 1.00% or higher. Over decades, even small differences in expense ratios compound into thousands of dollars, so this number is worth paying attention to.
Some brokerages also charge fees for account transfers, paper statements, or access to certain research tools. Read the fee schedule before opening an account.
How Stock Trades Work
When you’re ready to buy, you’ll place an order through your brokerage. The three most common order types work quite differently.
- Market order: This buys or sells immediately at whatever the current price is. It guarantees your trade goes through but not the exact price you’ll pay. For heavily traded stocks, the price you get will usually be very close to what you see on screen. For thinly traded stocks, you might pay more than expected.
- Limit order: This lets you set the maximum price you’re willing to pay (when buying) or the minimum you’ll accept (when selling). A buy limit order at $45 will only execute if the stock drops to $45 or lower. The trade might never happen if the price doesn’t reach your limit, but you won’t overpay.
- Stop-loss order: This triggers a sale once a stock falls to a price you specify. If you own a stock trading at $60 and set a stop-loss at $50, your shares will automatically be sold if the price hits $50. Once triggered, a stop-loss becomes a market order, so the final sale price could be slightly below your stop price in a fast-moving market.
For most beginners buying well-known stocks or ETFs, market orders work fine during regular trading hours. Limit orders give you more control and are worth using when you have a specific price in mind or when buying less liquid investments.
Taxes on Your Gains
The IRS taxes stock profits differently depending on how long you held the investment. This distinction between short-term and long-term capital gains has a meaningful impact on your actual returns.
If you sell a stock less than one year after buying it, your profit is a short-term capital gain and gets taxed at your ordinary income tax rate, the same rate applied to your salary. Depending on your income, that could be anywhere from 10% to 37%.
If you hold for more than one year before selling, your profit qualifies as a long-term capital gain, which is taxed at preferential rates. For the 2025 tax year, long-term capital gains rates are 0%, 15%, or 20% based on your taxable income. Single filers with taxable income up to $48,350 pay 0% on long-term gains. The 15% rate applies for income up to $533,400, and the 20% rate kicks in above that threshold. Married couples filing jointly get higher cutoffs: 0% up to $96,700 and 15% up to $600,050.
This tax structure creates a strong incentive to hold investments for at least a year. A $5,000 gain taxed at 15% costs you $750, while the same gain taxed at 24% (a common ordinary income bracket) costs you $1,200.
Dividends have their own tax rules. “Qualified” dividends from most U.S. companies are taxed at the same favorable long-term capital gains rates, while “nonqualified” dividends are taxed as ordinary income. Your brokerage will report which type you received at tax time.
Why Diversification Matters
Putting all your money into a single stock means your entire investment rises or falls with one company’s fortunes. Even well-run companies can lose significant value due to industry shifts, lawsuits, management failures, or broader economic downturns. Diversification, spreading your money across many stocks and ideally across different industries, reduces the damage any single company can do to your portfolio.
One way to measure a stock’s risk is its beta, which compares a stock’s price swings to the overall market. The market (represented by an index like the S&P 500) has a beta of 1.0. A stock with a beta of 1.5 tends to move 50% more than the market in either direction. A stock with a beta of 0.7 is less volatile. Beta won’t tell you whether a stock will go up or down, but it gives you a sense of how bumpy the ride will be.
The simplest way to diversify is through index funds or ETFs that hold hundreds or thousands of stocks in a single investment. A total stock market index fund, for example, gives you exposure to large, mid, and small companies across every sector of the economy. Many investors build their entire portfolio around a few broad index funds rather than picking individual stocks.
How Much You Need to Start
Most major brokerages have no minimum account balance, and many offer fractional shares, letting you buy a portion of a stock for as little as $1 or $5. You don’t need to wait until you can afford a full share of a company trading at $200. This makes it possible to start investing with whatever amount you can set aside from your regular income.
Starting small is fine, but consistency matters more than the initial amount. Setting up automatic recurring investments, sometimes called dollar-cost averaging, means you buy at a range of prices over time rather than trying to guess the best moment to invest a lump sum. This smooths out the impact of short-term price swings and removes the temptation to time the market.
Choosing a Brokerage Account
You’ll need a brokerage account to buy stocks. The two main types are taxable brokerage accounts and retirement accounts like IRAs. In a taxable account, you owe taxes on gains and dividends each year. In a traditional IRA, your investments grow tax-deferred until you withdraw the money in retirement. In a Roth IRA, you invest after-tax dollars but pay no taxes on qualified withdrawals later.
If your employer offers a 401(k) with matching contributions, that’s typically the best place to start since the match is essentially free money. After that, an IRA gives you more investment choices. A taxable brokerage account offers the most flexibility, with no contribution limits or withdrawal restrictions, but no tax advantages either.
When comparing brokerages, look at commission-free trading options, the range of available investments, the quality of the mobile app and research tools, and any account fees. The largest brokerages are broadly similar on cost, so usability and customer support often become the deciding factors.