Every term here links to the idea behind it. When a word trips you up mid-guide, this is the place to land.

Numbers

50/30/20 rule — A simple budget: 50% of take-home pay to needs, 30% to wants, 20% to savings and extra debt payoff. A direction, not a grade.

401(k) — A workplace retirement account, often with an employer match — which is close to free money, so grab it first.

A

APR (Annual Percentage Rate) — The yearly cost of borrowing, including interest and most fees. Lower is better when you borrow.

APY (Annual Percentage Yield) — The yearly return on savings, including the effect of compounding. Higher is better when you save.

B

Budget — A plan for your money before you spend it, usually splitting income into needs, wants, and savings.

C

Capital gain — The profit when you sell an investment for more than you paid. It's taxed when you sell in a regular (taxable) account.

Compound interest — Interest earned on both your original money and the interest it already earned. The engine behind long-term growth.

Credit score — A number lenders use to judge how reliably you repay. Built mostly from on-time payments and low balances.

Credit utilization — How much of your available credit you're using. Under 30% is good; under 10% is excellent.

Credit-builder loan — A starter loan where you "repay" into a locked savings account to build credit, then receive the money at the end.

D

Debt avalanche — Paying off debts highest-interest-rate first. Saves the most money mathematically.

Debt snowball — Paying off debts smallest-balance first. Slightly more interest, but the quick wins keep most people going.

Diversification — Spreading money across many investments so no single one can sink you. Index funds do this automatically.

Dividend — A share of a company's profit paid to shareholders. Can usually be set to reinvest automatically.

Dollar-cost averaging — Investing a fixed amount on a schedule, so you buy more shares when prices are low and fewer when high.

E

Emergency fund — Cash set aside (commonly 3–6 months of expenses) for surprises, kept somewhere easy to access.

ETF (Exchange-Traded Fund) — A fund that trades like a stock throughout the day. Many ETFs are low-cost index funds.

Expense ratio — A fund's annual fee, taken quietly from your returns. Lower is strictly better; under ~0.10% is cheap.

F

Fractional shares — Buying a slice of one share, so you can invest an exact dollar amount even in a pricey stock or fund.

H

High-yield savings account (HYSA) — A savings account paying far more interest than a typical bank, with easy access to your cash.

I

Index fund — A fund that owns a whole market (like the S&P 500) instead of trying to beat it. Low-cost and beginner-friendly.

Interest — The price of borrowing money (you pay it on debt) or the reward for saving it (you earn it on savings).

L

Liquidity — How quickly something can become cash without losing value. A savings account is liquid; a house is not.

M

Minimum payment — The smallest amount that keeps a debt current. Paying only this maximizes the interest you'll pay.

Mutual fund — A pooled investment priced once a day. Index mutual funds are a classic low-cost way to invest.

N

Net worth — Everything you own minus everything you owe. The clearest single snapshot of financial progress.

P

Principal — The original amount you borrowed or invested, before any interest.

R

Roth IRA — A retirement account funded with after-tax money; qualified withdrawals in retirement are tax-free.

T

Take-home pay — What actually lands in your account after taxes and deductions. Budget on this, not your gross salary.

Traditional IRA — A retirement account where contributions may be tax-deductible now, with withdrawals taxed later.

Still stuck on a term? Tell us and we'll add it — and probably write a guide on it.