Investing
Stocks, index funds, ETFs, and building long-term wealth through investing.
Most personal investing comes down to a few decisions made well: what tax-advantaged accounts you use, how much of your portfolio is in low-cost index funds, and whether your asset allocation matches your time horizon. The legal and regulatory framework — SEC oversight of public markets, FINRA oversight of brokers, the Investment Company Act for mutual funds — shapes the products available and the disclosures you can rely on.
Key laws
Key agencies and resources
Important deadlines and limits
| IRA / Roth IRA contribution deadline | Tax filing deadline of the following year (typically April 15) |
| 401(k) elective deferral deadline | December 31 (calendar-year plans) |
| Required Minimum Distributions (RMD) start age | 73 (born 1951–1959); 75 (born 1960 or later) under SECURE 2.0 |
| Tax-loss harvesting cutoff | December 31 (settlement date) |
All investing questions (16)
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How do I diversify my investment portfolio?
Diversification means spreading your money across different asset types, sectors, and geographies so that no single investment can wipe out your portfolio. In practice, two or three low-cost index funds covering US stocks, international stocks, and bonds are enough for most investors.
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How do I invest for retirement in my 20s?
In your 20s, your most valuable asset is time — a dollar invested at 22 is worth roughly four times more at retirement than a dollar invested at 42. The playbook is straightforward: capture your 401k employer match, open a Roth IRA, buy low-cost index funds, and invest consistently.
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How do I invest in the stock market for beginners?
Open a brokerage or retirement account, deposit money, and buy a low-cost total market index fund. That's the full strategy for most beginners — everything else is noise.
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How do I pick an index fund?
Start with what index the fund tracks, then check the expense ratio (under 0.10% is the target), and confirm there's no minimum investment or sales load. For most people, one broad US market index fund covers the core of a long-term portfolio.
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How do I rebalance my investment portfolio?
Rebalancing means selling assets that have grown above your target allocation and buying those that have fallen below it, returning the portfolio to its intended risk level. Annual rebalancing is optimal for most investors — more frequent rebalancing costs money without adding meaningful benefit.
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How do I start investing with little money?
You can start investing with as little as $1 — most major brokerages have eliminated minimums and offer fractional shares. The single most important move is to start early, even small amounts, because time in the market matters more than amount.
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What is a backdoor Roth IRA and how does it work?
A backdoor Roth IRA is a two-step strategy for high earners who exceed Roth IRA income limits: contribute to a traditional IRA with after-tax money, then convert it to a Roth IRA. The pro-rata rule creates a tax complication if you have other traditional IRA balances.
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What is a brokerage account?
A brokerage account is an investment account you open with a licensed firm that lets you buy and sell stocks, ETFs, mutual funds, and bonds. Unlike a 401k or IRA, there are no contribution limits and no restrictions on when you can withdraw your money.
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What is a Roth 401(k) and should I use one?
A Roth 401(k) is a workplace retirement account where contributions are made after tax, so withdrawals in retirement are tax-free. Unlike a Roth IRA, there are no income limits — anyone whose employer offers one can contribute regardless of earnings.
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What is a target-date fund?
A target-date fund is a single fund that automatically shifts from aggressive (mostly stocks) to conservative (more bonds) as you approach a chosen retirement year. Pick the fund with the year closest to when you plan to retire and it handles the rest.
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What is an expense ratio and why does it matter?
An expense ratio is the annual fee a fund charges as a percentage of your invested assets — deducted automatically, not billed separately. Even a small difference in expense ratios compounds into thousands of dollars over a long investment horizon.
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What is an index fund and should I invest in one?
An index fund tracks a market index like the S&P 500 — you own a tiny piece of hundreds of companies at once. Low fees and automatic diversification make them the default recommendation for most investors.
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What is compound interest?
Compound interest is earning interest on your interest — your returns generate their own returns, causing money to grow exponentially rather than in a straight line. Over decades, it's the single most powerful force in personal finance.
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What is dollar-cost averaging?
Dollar-cost averaging means investing a fixed dollar amount on a regular schedule regardless of market conditions — you automatically buy more shares when prices are low and fewer when prices are high, removing the pressure of timing the market.
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What is risk tolerance in investing?
Risk tolerance is your ability and willingness to endure investment losses in exchange for the chance of higher returns. It determines how much of your portfolio should be in stocks (higher risk, higher return potential) versus bonds (lower risk, lower return potential).
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What is the difference between an ETF and a mutual fund?
ETFs trade on stock exchanges throughout the day like individual stocks, while mutual funds are priced once daily after market close. Both can hold the same underlying investments — for most investors, a low-cost index ETF and a low-cost index mutual fund are functionally identical.