Index Funds and ETFs Explained: What You Actually Own
What an index fund or ETF share really represents, how the two structures are bought, priced and taxed, and what to check in any fund before you own it.
Investing, explained with the receipts
Understand what you own, what it costs and how it's taxed.
Plain-language guides to index funds, ETFs, fees, diversification and the accounts that hold them, with every rule cited to its official source and every example worked out in full. No stock picks, no predictions.
A useful place to begin
Build a low-cost foundation
Expense Ratios: What a Fund's Fee Costs You Over 30 Years
What an expense ratio pays for, how it comes out of your balance without a bill, and a worked 30-year example showing what different fee levels cost.
IRA, Roth IRA, Taxable or HSA: Which Account Does What
How a traditional IRA, a Roth IRA, a taxable brokerage account and an HSA each treat contributions, growth and withdrawals, with the IRS's 2026 limits.
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Explore the topics
- Investing basicsStocks, bonds, funds and how a brokerage account works, for your first steps.
- Funds and ETFsIndex funds, ETFs and mutual funds: how they work and how to read one before you buy.
- FeesExpense ratios, loads and advisory fees, and the arithmetic of what they cost you over time.
- DiversificationAsset classes, asset allocation and rebalancing, explained without forecasts.
- Investment taxesHow capital gains, dividends and interest are taxed, and the rules that trip people up.
- AccountsIRA, Roth IRA, taxable brokerage and HSA: the rules, the limits and what each is for.
Keep exploring
More guides
Asset Allocation by Time Horizon: A Method, Not a Model Portfolio
How time horizon and risk tolerance shape an asset allocation, the questions regulators suggest asking, and why there is no single mix that fits every goal.
Asset Location: Which Investments to Hold in Which Account
Asset location is the idea of choosing which account holds which investment, based on how each kind of income is taxed. Here are the federal tax rules behind it and the trade-offs people weigh.
Backdoor Roth and Pro-Rata Rule: What the IRS Forms Actually Say
A backdoor Roth is a nondeductible IRA contribution followed by a conversion; Form 8606 decides how much is taxed, and other IRA balances change the answer.
Cost Basis and Form 1099-B: Tracking What You Paid
What cost basis is, how the IRS lets you match shares sold to shares bought, what changes your basis over time, and how to read the boxes on Form 1099-B, including covered and noncovered securities.
Diversification and Asset Classes: Why Not Everything Moves Together
What asset classes are, why spreading money across and within them reduces some risks but not all, and how to check whether a portfolio is as diversified as it looks.
Dividends Explained: Qualified, Ordinary and Reinvested
How the IRS taxes dividends in a taxable account: what makes a dividend qualified, the 61-day holding period, why reinvested dividends are still income, and how to read Form 1099-DIV.