By Benjamin Roure L'Hermitte
Investing means putting money into an asset, such as shares of a company, bonds, real estate or a fund, in the hope that it will grow in value or pay an income over time, while accepting the risk of losing part of it. Saving keeps money safe and available; investing puts it to work. In the United States, 56% of families owned stocks in 2025 according to the Federal Reserve. This guide explains what investing means, how investments make money, the risks they carry and what counts as investment income.
- Investing is buying an asset you expect to rise in value or pay income, accepting that it can fall.
- 56% of US families held stocks in 2025, directly or through funds and retirement accounts, according to the Fed's Survey of Consumer Finances.
- 3.7%: inflation over the year to September 2026 according to the BLS. Money that earns less loses purchasing power.
- No deposit insurance: stocks, bonds, mutual funds and crypto assets are not FDIC insured, even when bought at a bank.
The word covers very different things, from buying an index fund every month for retirement to buying a rental property. What they share: you give up the use of money today in the hope of having more tomorrow, and that extra is never guaranteed.
The figures and rules quoted here are American: the Federal Reserve, the Bureau of Labor Statistics, the FDIC and the IRS. For concrete options, our guide on where to invest money compares the main choices.
TL;DRInvesting means buying an asset, a stock, a bond, a fund or real estate, in the hope that it gains value or pays income, with a risk of loss. Saving protects your capital and keeps it available; investing aims for a higher return over several years. An investment pays in two ways: income (interest, dividends, rent) and capital gains. In the US, investment income is taxed differently from wages and can face a 3.8% tax above $200,000 of income.
What does investing mean?
To invest is to commit money today in the expectation of a future gain. The asset can be a share of a company (a stock), a loan to a government or a company (a bond), a basket of securities (a mutual fund or an ETF), real estate, or a so-called alternative asset such as gold. What they have in common is risk: the price can fall and the income may not come.
Investing differs from saving, whose goal is to preserve capital, and from speculation or trading, which seek to profit from short-term price moves. An investor thinks in years, looks at what the asset produces and accepts declines along the way.
| Saving | Investing | |
|---|---|---|
| Goal | Keep money safe and available | Grow it over several years |
| Time horizon | Short term, emergencies, near-term plans | Usually five years or more |
| Examples | Savings account, money market account, CD | Stocks, bonds, mutual funds, ETFs, real estate |
| Risk of loss | Very low, deposits are insured | Real, the capital can fall |
| FDIC insurance | Yes, up to $250,000 per depositor and per bank | No |
How investments make money
An investment pays in two ways. Income: interest from a bond, dividends from a stock, rent from a property. Capital gains: the difference between the selling price and the purchase price. When income is reinvested, it earns income in turn: that is compounding, and it grows stronger the longer you hold.
Example: $200 a month for 30 years
| Assumed annual return | Value after 30 years | Of which contributions |
|---|---|---|
| 0.38% (FDIC national average savings rate) | $76,252 | $72,000 |
| 4% | $138,810 | $72,000 |
| 6% | $200,903 | $72,000 |
Returns chosen for illustration, monthly compounding, before taxes and fees: these are not forecasts, and a stock investment can lose value several years in a row. The compound interest calculator lets you run the numbers with your own figures.
The main types of investments
- Stocks: a share of a company's capital, entitled to dividends and tracking the company's value. The highest expected return, and the largest swings.
- Bonds: a loan to a government or a company that pays interest and returns the capital at maturity, unless the borrower defaults.
- Mutual funds and ETFs: baskets of securities managed on behalf of investors, which diversify in a single purchase. See what is an ETF and index funds vs ETFs vs mutual funds.
- Cash equivalents: money market funds and Treasury bills, close to saving, covered in our guide to money market accounts and funds.
- Real estate: a rental property, or shares in real estate companies and funds.
- Alternatives: gold, private equity, crypto assets, riskier or less liquid.
Risk and return
There is no high return without risk. The main ones are market risk (prices fall), inflation risk (the return does not keep up with prices), liquidity risk (you cannot sell quickly at a fair price) and concentration risk (betting everything on one security). Diversification, spreading money across many securities and several asset classes, and time are the two protections an individual investor has.
Legal protection is not the same as for a deposit. According to the FDIC, stocks, bonds, mutual funds, crypto assets, life insurance, annuities and municipal securities are not covered by deposit insurance, even when bought at an insured bank. SIPC protects the customers of a failed brokerage firm up to $500,000, including $250,000 in cash, but not against market losses.
Why invest: inflation
Keeping all your money in a savings account has a hidden cost. In the US, consumer prices rose 3.7% over the year to September 2026 according to the BLS, while the national average savings rate was 0.38% according to the FDIC. $10,000 saved becomes $10,038 after a year, but buys only what $9,680 bought before: about $320 of purchasing power lost. Savings remain essential for emergencies; money you will not need for years is better invested.
What is investment income?
Investment income means interest, dividends, capital gains, rents and royalties, as opposed to earned income from work. In the US, interest and ordinary dividends are taxed like wages; qualified dividends and gains on assets held more than a year are taxed at 0%, 15% or 20% depending on income (IRS, Topic 409).
On top of that comes the 3.8% Net Investment Income Tax (IRS, Topic 559) when modified adjusted gross income exceeds a threshold. It applies to the smaller of two amounts: net investment income, or the income above the threshold. Example: a single filer with $230,000 of income, of which $40,000 is investment income, pays 3.8% on $30,000, or $1,140.
| Filing status | Threshold for the 3.8% tax |
|---|---|
| Single or head of household | $200,000 |
| Married filing jointly | $250,000 |
| Married filing separately | $125,000 |
How to start investing
- Build an emergency fund of three to six months of expenses in an account you can access.
- Pay off high-interest debt such as credit cards: no investment reliably earns as much.
- Use tax-advantaged accounts first, such as an employer 401(k) and an IRA, and for a child a Trump account.
- Pick a simple, diversified investment, for example a low-cost index fund.
- Invest at regular intervals and stay the course through declines.
Our guide on how to start investing in stocks walks through the first steps, from opening an account to placing a first order.
Frequently asked questions
What is investing, in one sentence?
Putting money into an asset, a stock, bond, fund or property, in the hope that it gains value or pays income, while accepting the risk of loss.
What is the difference between saving and investing?
Saving keeps money safe and available, with a low return. Investing aims for a higher return over several years, in exchange for the risk of declines.
Is investing the same as speculating?
No. An investor buys for what the asset will produce over years. A speculator or trader tries to profit from short-term price moves.
What is investment income?
Interest, dividends, capital gains, rents and royalties. In the US, it can face a 3.8% tax above $200,000 of income for a single filer.
Can you lose money investing?
Yes. Stocks, bonds and funds are not insured like bank deposits and can lose value. Diversification and a long time horizon reduce that risk without removing it.
How much money do you need to start investing?
There is no legal minimum: many brokers accept small amounts and fractional shares. What matters is having an emergency fund first.