Glossary
Every term, defined in about 90 seconds.
76 definitions written the way we write everything: the point first, a real number second. Each term links to the guide where the concept gets the full treatment.
76 terms
401(k)
An employer retirement plan funded straight from payroll. The 2026 employee limit is $24,500, and many employers match a slice of what you put in. Contribute at least to the full match before anything else.
50/30/20 rule
A starter budget: 50% of take-home pay to needs, 30% to wants, 20% to savings and debt payoff. The ratios are a diagnostic, and the 20% is the line to defend.
ACH
The batch payment network behind direct deposit and most bank transfers. Free at most banks and settles in 1 to 3 business days. The default rail for anything that is not urgent.
Amortization
The schedule that splits each fixed loan payment between interest and principal. Early payments are mostly interest: in year one of a 30-year mortgage at 6.5%, roughly 85 cents of each dollar is interest.
APR
Annual percentage rate: the yearly cost of borrowing, before compounding. Card issuers divide APR by 365 and charge that daily, so a 24% APR costs about 0.066% per day on whatever you owe.
APY
Annual percentage yield: what a deposit account actually pays over a year, with compounding counted. A 4% APY on $10,000 pays about $400 in year one. Compare savings accounts by APY, never by the flat rate.
Asset allocation
The split of your portfolio across stocks, bonds, and cash. It sets most of your risk and return before you pick a single fund. A common starting point for a 22-year-old is heavy in stocks, since the money has decades to recover from crashes.
Avalanche method
Paying minimums on everything and every spare dollar at the highest-APR debt first. Mathematically the cheapest payoff order. The snowball (smallest balance first) costs a bit more and quits less.
Bitcoin
The first and largest cryptocurrency, capped at 21 million coins by its protocol. Its price routinely rises or falls 50% in a year, so position sizing, keeping it a small slice, is the whole risk plan.
Blockchain
A public ledger of transactions maintained by many computers instead of one company, secured so past entries are effectively unchangeable. It is the bookkeeping under every cryptocurrency.
Bond
A loan you make to a government or company that pays interest and returns the principal at maturity. Bond prices fall when interest rates rise, which surprises people who bought them to be safe.
Brokerage account
The account you buy investments through. A standard taxable brokerage has no contribution limit and no withdrawal rules; retirement accounts like IRAs trade flexibility for tax breaks.
Capital gains
The profit from selling an investment for more than you paid. Hold over a year and the gain is taxed at long-term rates of 0%, 15%, or 20%; sell within a year and it is taxed like salary.
Certificate of deposit (CD)
A deposit locked for a fixed term, from 3 months to 5 years, in exchange for a fixed rate. Withdraw early and you forfeit some interest. A CD ladder staggers maturities so some cash frees up regularly.
Closing costs
The fees to finalize a real estate purchase: lender, title, appraisal, escrow, taxes. Typically 2% to 5% of the price, due in cash at closing, and a main reason buying only pays off if you stay put for years.
Cold storage
Keeping crypto keys on a device that never touches the internet, usually a hardware wallet. Coins on an exchange are an IOU from that exchange; cold storage is actual custody, with you as the single point of failure.
Compound interest
Interest earned on interest you already earned. $1,000 at 7% becomes $1,967 in 10 years and $7,612 in 30, because each year's growth builds on the last. Time in the market is the biggest input.
Credit report
The file of your borrowing history kept by Equifax, Experian, and TransUnion. Scores are computed from it, errors on it are common, and you can pull each bureau's report free every week at annualcreditreport.com.
Credit score
A number, usually FICO 300 to 850, that predicts how likely you are to repay. Payment history (35%) and utilization (30%) drive most of it. Above roughly 740 you get a lender's best rates.
Credit utilization
The share of your credit limits you are using, and 30% of a FICO score. $300 carried on a $1,000 limit is 30% utilization; keeping it under 10% scores best. It resets monthly, so high utilization has no memory once paid down.
Debt-to-income ratio
Monthly debt payments divided by gross monthly income. Mortgage lenders like the total under 36% and get strict above 43%. It is the number that decides how much house a bank thinks you can afford.
Deductible (insurance)
What you pay out of pocket before insurance pays. A $500 to $1,000 deductible against a real emergency fund usually beats paying a fatter premium to insure amounts you could cover yourself.
Diversification
Spreading money across many investments so no single failure sinks you. One stock can go to zero; all 500 S&P companies going to zero at once is a different planet. Index funds buy diversification in one purchase.
Dividend
Cash a company pays shareholders from its profits, usually quarterly. Reinvested dividends are a large share of the stock market's long-run return, and they are taxable in a regular brokerage account even if reinvested.
Dollar-cost averaging
Investing a fixed amount on a schedule regardless of price, like $200 every payday. It removes timing decisions and buys more shares when prices are low. With a lump sum, investing immediately beats averaging in about 67% of the time.
Down payment
The cash you put toward a home purchase up front. 20% avoids PMI, but many first-time buyers put down 3% to 10% and pay PMI as the price of starting sooner. Closing costs add 2% to 5% on top.
Effective tax rate
Total tax divided by total income: the rate you actually paid across all brackets. It always sits below the marginal rate, which is why 'I'm in the 22% bracket' overstates most tax bills.
Emergency fund
Cash for genuine surprises, parked in high-yield savings. A common target is 3 to 6 months of expenses; even a starter $1,000 keeps a car repair off a 24% APR credit card.
Employer match
Free retirement money: an employer adds to your 401(k) when you contribute, commonly 50 cents per dollar up to 6% of salary. Skipping the match is turning down part of your pay.
Equity
What you own free and clear: the asset's value minus what you owe on it. A $300,000 home with a $240,000 mortgage is $60,000 of equity. It grows from paying principal and from the price rising.
Escrow
A neutral third-party account that holds money mid-transaction, and, after closing, the account your lender uses to collect and pay property taxes and insurance inside the monthly payment.
ETF
Exchange-traded fund: a basket of investments that trades on an exchange like a single stock. Most beginner-friendly ETFs are index funds in ETF form, with expense ratios as low as 0.03%.
Expense ratio
The yearly fee a fund charges, taken silently out of the balance. The difference between 0.04% and 1% sounds tiny and costs a six-figure sum over a 40-year career, because the fee compounds against you.
FDIC insurance
Federal insurance that repays bank deposits if the bank fails, up to $250,000 per depositor, per bank, per ownership category. It has never lost an insured depositor a dollar since 1933. Credit unions have the same deal through the NCUA.
Federal funds rate
The overnight rate the Federal Reserve targets, reset roughly every six weeks. It anchors most other rates: when it moves, savings APYs, card APRs, and mortgage rates follow.
FICA
The payroll tax funding Social Security and Medicare: 7.65% out of your check, matched by your employer. It applies from the first dollar, which is why a first paycheck is smaller than the hourly math promised.
Fiduciary
An advisor legally required to put your interests first. Many financial salespeople are not fiduciaries and only owe you a 'suitable' product. Ask the question directly and get the answer in writing.
FIRE
Financial independence, retire early: saving aggressively until about 25 times annual spending is invested, at which point a 4% withdrawal rate can cover life. The useful part for most people is the math, not the retirement date.
Hard inquiry
The credit check that happens when you apply for new credit. One costs a few score points for under a year. Rate-shopping several mortgage or auto lenders within about 45 days counts as a single inquiry.
High-yield savings account
An FDIC-insured savings account, usually at an online bank, paying roughly 4% APY in mid-2026 while big-bank accounts pay about 0.01%. Same insurance, same access, about $400 more per year on $10,000.
HSA
Health savings account, available with a high-deductible health plan. The only triple tax break in the code: deductible going in, tax-free growth, tax-free out for medical costs. Invested and left alone, it moonlights as a retirement account.
Index fund
A fund that buys every stock in a list, like all 500 companies in the S&P 500, instead of paying a manager to pick. The result is average market performance at a rock-bottom fee, which beats most professionals over decades.
Inflation
The rate at which prices rise and cash loses buying power. At 3% a year, today's $100 buys about $74 worth in 10 years. It is the reason long-term money belongs in assets, and cash under a mattress quietly shrinks.
Lifestyle creep
Spending that rises to meet every raise, leaving the savings rate flat. The countermove is automatic: route a fixed slice of each raise to savings before it reaches checking.
Liquidity
How fast something converts to spendable cash without losing value. Savings are liquid same-day; a house can take months and 6% in fees. Emergencies need liquid money, which is why the emergency fund is not invested.
Marginal tax rate
The rate on your next dollar of income, set by your top bracket. A raise into a higher bracket only taxes the dollars above the line, so a raise never lowers take-home pay.
Market cap
A company's share price times its share count: the market's price tag for the whole business. It is why a $900 stock can be a smaller company than a $150 one, and why price alone tells you almost nothing.
Minimum payment
The smallest card payment that avoids a late fee, typically 1% to 2% of the balance plus interest. Paying only minimums on $3,000 at 24% APR takes over a decade to clear. The minimum is a floor, never a plan.
Money market account
A savings account variant that may add check-writing or a debit card, with rates similar to high-yield savings. Distinct from money market funds at a brokerage, which are investments, not FDIC-insured deposits.
Mutual fund
A pooled fund you buy directly from the fund company, priced once a day after the market closes. Index mutual funds and index ETFs do the same job; fees matter far more than the wrapper.
Net worth
Everything you own minus everything you owe: the single number that tracks financial progress. Income is not it; a high earner with higher spending can be worth less than a careful student.
Opportunity cost
What money could have earned in its best alternative use. $100 a month of takeout is also roughly $120,000 of index-fund balance after 30 years at 7%. Neither answer is wrong; the lens is the point.
Overdraft
Spending more than your available checking balance. Banks that still charge for it take $25 to $35 per overdraft. Turn off overdraft coverage and a card simply declines instead, which is free.
PITI
Principal, interest, taxes, insurance: the real monthly cost of owning a home. Taxes and insurance commonly add 25% or more on top of the loan payment, and maintenance rides on top of that.
PMI
Private mortgage insurance, charged when a down payment is under 20%. It protects the lender, costs roughly 0.5% to 1.5% of the loan per year, and can be removed once you reach about 20% equity.
Premium (insurance)
The recurring price of an insurance policy, monthly or yearly. Raising your deductible lowers the premium; the right trade depends on the size of your emergency fund.
Principal
The amount you actually borrowed, as opposed to the interest charged on it. Every debt payment splits between the two; extra payments that hit principal directly are what shorten a loan.
Refinancing
Replacing a loan with a new one at a better rate or term. Worth checking when rates drop about a point below what you pay, after counting the closing costs of the new loan.
Robo-advisor
Software that builds and rebalances an index portfolio for a fee, usually about 0.25% a year on top of fund fees. It buys convenience; a target-date fund does most of the same job for less.
Roth IRA
A retirement account funded with money you already paid tax on. Growth and qualified withdrawals are tax-free, and you can withdraw contributions (never earnings) anytime without penalty. The 2026 contribution limit is $7,500.
Rule of 72
A shortcut for doubling time: divide 72 by the annual return. At 8%, money doubles in about 9 years; at 3%, about 24. It also works in reverse for inflation eating your cash.
Savings rate
The share of income you keep. It matters more than returns early on, and it drives the whole financial-independence math: save 10% and work about 50 years, save 50% and about 17.
Secured credit card
A starter credit card backed by a refundable deposit, usually $200 to $500, which becomes the limit. The standard first rung for building credit from zero; use it lightly, pay in full, upgrade in a year.
Sinking fund
Saving monthly for a known future expense, like $50 a month toward $600 holiday spending. It turns predictable lump sums into a budget line so they stop being 'emergencies.'
Snowball method
Paying the smallest debt first for the quick win, then rolling its payment into the next one. It costs somewhat more interest than the avalanche and keeps more people on the plan, which is the point.
Stablecoin
A crypto token designed to hold a fixed value, usually $1, backed by reserves. Useful as crypto's cash drawer, but it pays no interest by default and is only as good as the issuer's reserves.
Standard deduction
Income the IRS ignores before brackets apply, with no receipts needed. Around nine in ten filers take it instead of itemizing. It is why a first part-time job often owes no federal income tax at all.
Target-date fund
A single fund that holds a full portfolio and shifts from stocks toward bonds as a retirement year approaches. A one-decision option: pick the year, keep contributing, ignore the news.
Tax-loss harvesting
Selling a losing investment to book the loss against gains or up to $3,000 of income, then buying something similar (waiting 31 days if it is 'substantially identical' to dodge the wash-sale rule).
Term life insurance
Pure life coverage for a fixed period, like $500,000 for 20 years, at a fraction of whole-life's price. If no one depends on your income, you likely do not need life insurance at all yet.
Traditional IRA
A retirement account funded with pre-tax money: contributions may reduce this year's tax bill, and withdrawals in retirement are taxed as income. The Roth-vs-traditional call comes down to your tax rate now vs later.
Vesting
The schedule on which employer contributions become truly yours. A three-year vest means leaving after two forfeits some or all of the match. Your own contributions are always 100% yours.
Volatility
How violently a price swings. The S&P 500 drops 10% about once a year on average and still compounds near 10% annually over decades; crypto routinely halves. Volatility is the toll for long-run returns.
Wire transfer
A same-day, effectively irreversible bank transfer costing about $15 to $35. Required for real estate closings; overkill for nearly everything else. Wire fraud works because wires do not come back.
Withholding
Tax your employer sends the IRS from each paycheck, steered by your W-4. A big refund means you over-withheld and lent the government money at 0% all year. Adjust the W-4, keep the difference monthly.
Yield
The income an investment pays as a percentage of its price. A bond bought at $1,000 paying $45 a year yields 4.5%. Chasing the highest yield usually means buying the most risk.