Category: Investing

Index funds are the most widely recommended investment vehicle for individual investors — endorsed by Warren Buffett, backed by decades of academic research, and accessible with as little as $1. If you are new to investing and want to start without needing to understand individual stocks or pick fund managers, index funds are the right starting point.

Related: What Is Net Unrealized Appreciation (NUA)?

What Is an Index Fund?

An index fund is a type of mutual fund or ETF that tracks a market index — a list of securities that represents a portion of the market. The most common example is the S&P 500 index, which includes the 500 largest publicly traded US companies. An S&P 500 index fund simply holds those same 500 stocks in the same proportions as the index, with no active manager trying to pick winners.

Because no one is actively managing the portfolio, costs are low. The average expense ratio for an index fund is around 0.03%–0.10% per year. Actively managed funds charge 0.5%–1.5% or more — and research consistently shows they underperform index funds over long periods after fees.

Why Index Funds Work

The data is consistent: roughly 80%–90% of actively managed funds underperform their benchmark index over 10- and 20-year periods. This is not because fund managers are unskilled — it is because markets are efficient enough that beating them consistently after costs is extremely difficult. Index funds accept market returns rather than trying to beat them, which paradoxically produces better outcomes for most investors over time.

Types of Index Funds to Know

• Total US market index fund: Owns essentially every publicly traded US company, including small- and mid-cap stocks. Broader diversification than S&P 500 alone. (Example: Vanguard Total Stock Market Index — VTI or VTSAX)
• S&P 500 index fund: Tracks the 500 largest US companies. Highly diversified, low-cost, and the most commonly referenced benchmark. (Example: Fidelity ZERO Large Cap Index, Schwab S&P 500 Index Fund)
• International index fund: Holds stocks from companies outside the US. Adds geographic diversification. (Example: Vanguard Total International Stock — VXUS)
• Bond index fund: Tracks a bond market index. Adds stability to a portfolio and reduces volatility. (Example: Vanguard Total Bond Market — BND)
• Target-date fund: A fund-of-funds that automatically shifts from stocks to bonds as you approach a target retirement year. Requires zero management. A reasonable default for most investors.

Where to Open an Account

You need a brokerage account or a retirement account to hold index funds. The main options:

• 401(k) through your employer: If your employer offers this, contribute enough to capture the full match first — it is an instant 50–100% return on that portion.
• Roth IRA: Contribute after-tax dollars; growth and qualified withdrawals are tax-free. 2026 contribution limit: $7,000 ($8,000 if 50+).
• Traditional IRA: Contributions may be tax-deductible; withdrawals taxed in retirement.
• Taxable brokerage account: No contribution limits, full flexibility, but no tax shelter. Use this after maxing tax-advantaged accounts.

Fidelity, Vanguard, and Schwab are the most commonly recommended brokerages — all offer zero-commission trades and zero-expense-ratio index funds of their own.

How to Actually Buy an Index Fund

1. Open a brokerage or IRA account online (takes 10–20 minutes)
2. Fund the account via bank transfer
3. Search for the fund by name or ticker (e.g., “FZROX” for Fidelity ZERO Total Market Index Fund)
4. Buy a dollar amount or a number of shares — most brokerages allow fractional shares now
5. Enable automatic investments to contribute a set amount each month

The Most Common Beginner Mistakes

• Trying to time the market: Waiting for the “right time” to invest consistently underperforms simply investing as soon as funds are available. Time in the market beats timing the market.
• Panic-selling during downturns: Market drops of 20–40% are normal historical events. Selling locks in losses and removes you from the recovery.
• Over-diversifying into too many funds: A total market index fund and a bond index fund is sufficient diversification for most investors. Adding 10 more funds often just creates overlap.
• Ignoring tax-advantaged accounts: Holding index funds in a taxable account before maxing your IRA or 401(k) is leaving money on the table.

Bonds are loans. When you buy a bond, you are lending money to a government, municipality, or corporation. In exchange, the borrower pays you interest (called the coupon) over a set period and returns your principal when the bond matures. Bonds are considered lower-risk than stocks because bondholders are paid before equity shareholders if a company fails — but they also deliver lower long-term returns.

Most investors should hold some bonds, but how much and which type depends on your goals and time horizon.

Why Invest in Bonds

Bonds serve two main purposes in a portfolio:

• Income: Bonds pay regular interest, making them useful for investors who need cash flow — especially retirees.
• Diversification and stability: Bonds often move in the opposite direction of stocks during market downturns. A portfolio with both stocks and bonds typically experiences less volatility than one made entirely of equities.

The classic “60/40 portfolio” — 60% stocks, 40% bonds — is built on this relationship. While the diversification benefit has been less reliable during periods when stocks and bonds fall together (as in 2022), bonds remain a fundamental tool for risk management.

Types of Bonds

U.S. Treasury Bonds

Issued by the federal government. Considered the safest bonds available since they are backed by the U.S. government. Treasury bills (T-bills) mature in under a year; Treasury notes mature in 2–10 years; Treasury bonds mature in 20–30 years. Interest is exempt from state and local taxes.

Municipal Bonds (Munis)

Issued by state and local governments to fund infrastructure, schools, and public projects. Interest is typically exempt from federal income tax and often exempt from state taxes in the issuing state. Most useful for investors in high tax brackets — the tax advantage increases the effective yield relative to comparable taxable bonds.

Corporate Bonds

Issued by companies to raise capital. Higher yields than Treasuries because corporations carry more credit risk. Rated by agencies like Moody’s and S&P — investment-grade bonds (BBB/Baa or above) are considered relatively safe; high-yield or “junk” bonds (below BBB/Baa) offer higher yields in exchange for higher default risk.

I Bonds and TIPS

Treasury bonds linked to inflation. I bonds are purchased directly from TreasuryDirect.gov; TIPS trade on the secondary market. Both protect purchasing power during inflationary periods.

The Relationship Between Bond Prices and Interest Rates

This is the most important concept for bond investors to understand: bond prices move inversely to interest rates.

When interest rates rise, existing bond prices fall. When rates fall, bond prices rise. Here is why: if you hold a bond paying 3% and new bonds are issued at 5%, your 3% bond is less attractive — so its market price drops until its effective yield matches the new market rate.

This relationship is amplified by duration. Long-term bonds are more sensitive to rate changes than short-term bonds. In 2022, long-term Treasury bond funds lost 20–30% as rates rose sharply — a reminder that “safe” bonds can still lose significant value in rising-rate environments.

How to Invest in Bonds

Bond ETFs and Mutual Funds

For most investors, the simplest approach is buying bond ETFs or mutual funds through a brokerage or retirement account. These funds hold diversified portfolios of bonds and trade like stocks.

Popular options:

• BND (Vanguard Total Bond Market ETF): Broad exposure to U.S. investment-grade bonds. Expense ratio 0.03%.
• AGG (iShares Core U.S. Aggregate Bond ETF): Similar broad exposure. Expense ratio 0.03%.
• VGSH / SHY: Short-term Treasury ETFs for lower interest-rate sensitivity.
• VTIP / SCHP: TIPS ETFs for inflation protection.
• MUB (iShares National Muni Bond ETF): Municipal bonds for tax-exempt income.

Buying Individual Bonds

You can purchase individual Treasury bonds directly from TreasuryDirect.gov with no fees. For corporate and municipal bonds, you buy through a brokerage — note that the bid-ask spreads on individual bonds can be wide, especially for smaller purchases.

Building a “bond ladder” — purchasing individual bonds with staggered maturities (e.g., 1-year, 2-year, 3-year, 4-year, 5-year) — provides predictable cash flows and reduces reinvestment risk. As each bond matures, you reinvest at the current rate.

Treasury Direct for U.S. Treasuries and I Bonds

For direct Treasury purchases without brokerage fees, use TreasuryDirect.gov. You can buy T-bills, notes, bonds, and I bonds here. I bonds in particular can only be purchased through TreasuryDirect (electronic) or via your tax refund (paper).

Bonds in a Retirement Account vs. Taxable Account

Tax efficiency matters for bond placement:

• Taxable brokerage account: Municipal bonds are often more efficient here because their tax-exempt interest is most valuable to investors who would otherwise owe tax on it. TIPS can be tax-inefficient in taxable accounts because you owe tax on inflation adjustments even before you receive them.
• Tax-advantaged accounts (IRA, 401(k)): Taxable bonds (Treasuries, corporate bonds) are often better held here, where the interest income is sheltered from annual taxes.

How Much of Your Portfolio Should Be Bonds

A simple rule of thumb: subtract your age from 110 to get your stock allocation; the remainder goes to bonds. A 40-year-old would hold 70% stocks and 30% bonds by this formula.

More precise guidance depends on your risk tolerance, time horizon, and income needs. Target-date retirement funds automatically shift toward higher bond allocations as the target date approaches — a useful default if you do not want to manage the allocation manually.

The Bottom Line

Bonds provide income, reduce portfolio volatility, and offer diversification from equities. For most individual investors, bond ETFs are the simplest and most cost-effective way to access them. The key risk to understand is interest-rate sensitivity: longer-duration bonds lose more value when rates rise. Match your bond duration to your time horizon, and hold bonds primarily in tax-advantaged accounts when possible.

Related: How to Open a Roth IRA: Step-by-Step Guide

A brokerage account is an investment account that lets you buy and sell stocks, bonds, mutual funds, ETFs, and other securities. Unlike a 401(k) or IRA, a brokerage account has no contribution limits, no tax advantages, and no restrictions on when you can withdraw your money.

If you want to invest beyond what your retirement accounts allow — or you want access to your money before age 59½ — a brokerage account is the next step.

How a Brokerage Account Works

You open a brokerage account with a brokerage firm (like Fidelity, Charles Schwab, or an online broker like Robinhood). You deposit cash, then use that cash to buy investments. When you sell investments for a profit, you owe capital gains taxes on the gain.

The brokerage firm acts as the custodian — they hold your securities and execute your trades. You own the underlying assets; the brokerage just facilitates the transactions.

Taxable vs. Tax-Advantaged: The Key Difference

Brokerage accounts are often called “taxable accounts” because investment gains are not sheltered from taxes the way they are inside a 401(k) or IRA.

Here is how the tax treatment works in a brokerage account:

• Dividends: Taxed in the year you receive them, even if you reinvest them automatically.
• Short-term capital gains: If you sell an investment held less than one year for a profit, the gain is taxed at your ordinary income tax rate.
• Long-term capital gains: If you hold an investment for more than one year before selling, the gain is taxed at the lower long-term capital gains rate (0%, 15%, or 20% depending on your income).
• Interest income: Taxed as ordinary income in the year received.

This tax treatment is why most financial planners recommend maxing out tax-advantaged accounts (401(k), IRA, HSA) before contributing to a brokerage account. But once those accounts are maxed, a brokerage account is the logical next vehicle.

Types of Brokerage Accounts

Individual Brokerage Account

Owned by one person. You control the account and are responsible for all taxes on gains and income.

Joint Brokerage Account

Shared between two people, usually spouses or domestic partners. Both owners have full access to the account. Common ownership structures include “joint tenants with rights of survivorship” (JTWROS), where the surviving owner inherits the account automatically.

Custodial Account (UGMA/UTMA)

An account opened by an adult for a minor child. The adult manages the account until the child reaches adulthood (usually 18 or 21 depending on the state), at which point the child gains full control. Used for gifting money to children outside of a 529 plan.

What You Can Invest In

A standard brokerage account gives you access to:

• Individual stocks
• Exchange-traded funds (ETFs)
• Mutual funds
• Bonds (corporate, municipal, Treasury)
• Options contracts
• REITs (real estate investment trusts)
• Certificates of deposit (CDs)

Some brokerages also offer access to IPOs, alternative investments, and fractional shares (where you can buy a portion of a high-priced stock like Amazon or Google).

How to Choose a Brokerage

Most major brokerages now charge $0 commission for stock and ETF trades. The differences come down to:

• Investment selection: Does the brokerage offer the specific funds or ETFs you want?
• Fractional shares: Some brokerages (Fidelity, Schwab) let you invest in fractional shares; others do not.
• Research tools: Active investors benefit from robust screeners and analysis tools.
• Interface: Some platforms are built for beginners; others are designed for active traders.
• Customer service: If you prefer phone support or in-person branches, that narrows your options.

For most people starting out, Fidelity or Charles Schwab offers a strong combination of $0 commissions, no account minimums, fractional shares, and robust customer service.

Margin Accounts vs. Cash Accounts

When you open a brokerage account, you will typically choose between a cash account and a margin account.

In a cash account, you can only invest money you actually have. You deposit $5,000, you can invest up to $5,000.

In a margin account, the brokerage extends you a line of credit to buy more securities than your cash balance would allow. This amplifies both gains and losses, and you pay interest on the borrowed amount. Margin accounts are suitable for experienced investors who understand the risks — not recommended for beginners.

Opening a Brokerage Account

The process takes about 10 minutes online. You will need:

• Your Social Security number
• A government-issued ID
• Your bank account information (for funding the account)
• Your employment information

Most brokerages have no minimum deposit to open an account, though some mutual funds require a minimum initial investment (often $1,000 or more).

Brokerage Account vs. Retirement Accounts

A brokerage account is not a replacement for retirement accounts — it is a complement to them. The typical order of operations for investing:

1. Contribute enough to your 401(k) to get the full employer match
2. Max out an HSA (if you have a high-deductible health plan)
3. Max out a Roth or traditional IRA ($7,000 in 2024)
4. Continue contributing to your 401(k) up to the $23,000 limit
5. Invest additional savings in a brokerage account

The brokerage account sits at the end of that list not because it is bad, but because the tax advantages of retirement accounts are genuinely valuable and should be captured first.

The Bottom Line

A brokerage account is one of the most flexible investment tools available — no contribution limits, no withdrawal penalties, and access to virtually any publicly traded security. The trade-off is that gains are taxable in the year they occur. For investors who have already maxed their tax-advantaged accounts, or who want access to their money before retirement age, a brokerage account is the right next step.

Related: How to Open a Roth IRA: Step-by-Step Guide