How everyday finance actually works — pay, prices, interest and the systems behind them.
Average net worth by age from the Federal Reserve's 2025 Survey of Consumer Finances: the median U.S. family net worth is $215,900 and the mean is $1,241,500 — but the median is the honest benchmark. Both figures for every age group, under 35 to 75 and older, with source, survey year and methodology stated for every number.
A 401(k) is an employer retirement plan that takes money from your paycheck before or after tax. The 2026 limits ($24,500, plus catch-ups), how the employer match and vesting work, traditional vs Roth, loans, the 59½ penalty, RMDs and your options when you leave a job.
Compound interest is interest earned on your interest as well as your money. The formula A = P(1 + r/n)^nt explained piece by piece, worked examples with and without monthly contributions, the Rule of 72, APY, and how the same maths compounds credit-card debt against you.
Credit union vs bank comes down to ownership: members own a not-for-profit credit union, shareholders own a for-profit bank. FDIC vs NCUA insurance (both $250,000), what NCUA average-rate data actually shows, membership rules, branch and app trade-offs, and how to join.
Capital gains tax explained in plain English: what a capital gain is, how it is calculated, short-term vs long-term rates, the IRS thresholds for the 0%, 15% and 20% bands in tax year 2027, the 3.8% net investment income tax, losses, and the main-home exclusion.
How does Social Security work? Today's workers pay a 12.4% payroll tax that funds today's retirees, you qualify with 40 credits, and your benefit comes from your best 35 years — the full system, with the SSA's current 2026 figures.
ETF vs index fund is really a choice between two wrappers for the same strategy: intraday trading and no minimum against once-a-day pricing and exact-dollar automatic investing. The full comparison, and which account each one suits.
Net worth is calculated with one subtraction: total assets minus total liabilities. Here is what counts as an asset, what counts as a debt, a worked example with round numbers, the mistakes that distort the result — and how net worth differs from income and from a credit score.
How to build credit from scratch: open one account that reports to the three bureaus — a secured card, a credit-builder loan or authorized-user status — pay on time every time, keep balances well under your limit, and expect your first FICO Score after about six months.
Where do you stand? Net worth percentile thresholds by age from the Federal Reserve's 2025 Survey of Consumer Finances — the 50th, 75th, 90th and 95th percentiles and a dedicated top 1% (99th percentile) table for every age group, with each figure's source and methodology stated.
What is a dividend? A share of a company's profits paid to its shareholders, usually in cash every quarter — the four dates that decide who gets paid, how dividend yield works, why the price drops on the ex-date, and how the IRS taxes the payment.
A HELOC is a revolving credit line secured by your home's equity: borrow, repay and borrow again in the draw period, then repay in full afterwards. Variable rates, how lenders size the line with CLTV, requirements, the payment jump, foreclosure risk and HELOC vs home equity loan.
Adjusted gross income (AGI) is your total income minus a specific list of adjustments — it lands on line 11 of Form 1040. How AGI is calculated, the adjustments that lower it, where to find last year's AGI, and how AGI differs from taxable income and MAGI.
What is an emergency fund? Cash set aside only for unplanned expenses and loss of income. The starter goal, the 3 to 6 months of essential expenses guideline — and why the CFPB sets no fixed number — where to keep it, what counts as an emergency, and how to build one on a tight income.
An insurance deductible is the amount you pay yourself before the insurer starts paying: an annual total in health insurance, a per-claim amount in auto and home insurance. Worked examples for all three, dollar vs percentage deductibles, the trade-off against your premium, and how a deductible differs from a copay, coinsurance and the out-of-pocket maximum.
What is an ETF? A fund that holds a basket of stocks or bonds and trades on an exchange like a single share — how creation and redemption keep its price near its value, what it costs, the main types, and how to buy one.
APR is the total yearly cost of borrowing — interest plus certain lender fees — as a percentage. How it differs from the interest rate and from APY, a worked example where a $300 fee lifts an 8% rate to about 10.1% APR, APR on cards, mortgages and loans, fixed vs variable, and the 0% APR and deferred-interest traps.
An escrow account collects a slice of your mortgage payment each month to pay property taxes and homeowners insurance. Here is how the amount is set, what the cushion is, and why an escrow shortage makes your payment jump.
What is a good credit score? It starts at 670 on the FICO scale and at 661 on VantageScore's scale — and the two models draw their bands in different places. Here are both sets of ranges exactly as the companies publish them, the five factors that build a FICO Score, and how to check yours for free.
An HSA is a tax-exempt account paired with a high-deductible health plan that lets you pay medical costs with untaxed money. Who qualifies, the triple tax advantage, and the IRS limits for 2025 ($4,300 self-only, $8,550 family) and 2026 ($4,400, $8,750).