Reference
Personal Finance Glossary
Money language is full of jargon that sounds harder than it is. Here are 43 everyday finance terms, each explained in one plain sentence — with a link to the full guide when you want the detail.
Interest & rates
- APR (annual percentage rate)
APR, or annual percentage rate, is the yearly cost of borrowing money expressed as a percentage, including the interest rate plus certain lender fees.
Because APR folds in fees, it is usually a truer comparison of two loan offers than the interest rate alone.
- APY (annual percentage yield)
APY, or annual percentage yield, is the yearly rate of return you earn on savings, including the effect of compounding.
APY is always equal to or higher than the simple interest rate on the same account, which is why it is the fairest way to compare savings accounts.
- Compound interest
Compound interest is interest calculated on both the original principal and the interest already earned, so the balance grows at an accelerating rate.
- Simple interest
Simple interest is interest calculated only on the original principal, never on interest that has already accrued.
- Rule of 72
The Rule of 72 is a mental shortcut that estimates how many years an investment takes to double by dividing 72 by its annual rate of return.
At an 8% annual return, for example, 72 ÷ 8 suggests roughly nine years to double.
- Federal funds rate
The federal funds rate is the interest rate US banks charge one another to lend reserves overnight, and the Federal Reserve sets a target range for it to steer borrowing costs across the economy.
Savings-account yields, CD rates and variable-rate debt such as credit cards tend to move after the Fed changes this target.
- Prime rate
The prime rate is the benchmark interest rate US banks use for their most creditworthy borrowers, and by convention it sits three percentage points above the top of the Federal Reserve’s federal funds target range.
Most credit card APRs and home equity lines of credit are set as the prime rate plus a margin, so they change when the Fed moves.
- Treasury yield
A Treasury yield is the annual return an investor earns for lending money to the US government through a Treasury bill, note or bond, and it moves in the opposite direction to that security’s price.
The 10-year Treasury yield is the benchmark lenders watch most closely when pricing 30-year fixed mortgages.
Credit
- Credit score
A credit score is a three-digit number, most commonly on a 300 to 850 scale, that summarises how likely you are to repay borrowed money based on your credit history.
Lenders use it mainly to set the interest rate you are offered, not simply to approve or decline you.
- Credit utilization
Credit utilization is the share of your available revolving credit that you are currently using, calculated as your balances divided by your total credit limits.
It is one of the factors that can move a credit score relatively quickly, because it updates as balances change.
Banking & saving
- Checking account
A checking account is a deposit account designed for everyday spending, bill payment and direct deposit, typically with a debit card and unlimited transactions.
- Savings account
A savings account is a deposit account meant to hold money you are not spending day to day, paying interest on the balance.
- High-yield savings account (HYSA)
A high-yield savings account is a savings account that pays a substantially higher APY than a typical traditional savings account, usually offered by online banks.
The rate is variable, so it can move up or down after you open the account.
- Certificate of deposit (CD)
A certificate of deposit is a deposit account that holds your money for a fixed term at a fixed rate, usually charging a penalty if you withdraw early.
- Money market account
A money market account is a deposit account that pays interest like a savings account while adding some checking-style access, such as a debit card or limited check writing.
- Emergency fund
An emergency fund is money set aside in an accessible account to cover unexpected costs such as a job loss, medical bill or urgent repair.
A commonly cited target is several months of essential expenses, held somewhere you can reach quickly.
- Routing number
A routing number is the nine-digit ABA number that identifies the US financial institution holding an account, used for checks, direct deposits and transfers.
Debt payoff
- Debt snowball
The debt snowball is a payoff strategy where you put extra money toward your smallest balance first, then roll that freed-up payment into the next smallest.
It is chosen for motivation: the first debt disappears sooner, even though it may not be the cheapest route overall.
- Debt avalanche
The debt avalanche is a payoff strategy where you put extra money toward your highest interest rate first, which minimises the total interest you pay.
Mortgages & home buying
- 28/36 rule
The 28/36 rule is a lending guideline that keeps total monthly housing costs at or below 28% of gross monthly income and all monthly debt payments at or below 36%.
The 28% figure is called the front-end ratio; the 36% figure is the back-end ratio.
- Debt-to-income ratio (DTI)
Debt-to-income ratio is the share of your gross monthly income that goes toward monthly debt payments, expressed as a percentage.
Lenders use it alongside your credit score to decide how much you can borrow.
- Down payment
A down payment is the upfront portion of a purchase price you pay in cash, with the remainder covered by a loan.
- PMI (private mortgage insurance)
PMI, or private mortgage insurance, is an added monthly cost lenders require on a conventional mortgage when the down payment is less than 20%, and it protects the lender rather than the borrower.
On a conventional loan it can generally be removed once you reach enough equity in the home.
- Escrow
Escrow is an arrangement where a neutral third party holds money on behalf of others, most often a mortgage escrow account that collects and pays your property taxes and homeowners insurance.
- Closing costs
Closing costs are the one-time fees due when a property purchase or refinance is finalised, covering items such as lender fees, title work, appraisal and recording.
They are typically a small percentage of the loan amount and are paid separately from the down payment.
- Home equity
Home equity is the portion of your property you own outright, calculated as the home’s current market value minus the balance you still owe on it.
Car loans
- Negative equity
Negative equity means you owe more on a loan than the financed item is currently worth, a situation often described as being underwater or upside down.
It is common on car loans because vehicles can depreciate faster than a long loan pays down.
- Balloon payment
A balloon payment is a single large lump sum due at the end of a loan whose earlier monthly payments were deliberately kept small.
- Depreciation
Depreciation is the decline in an asset’s market value over time, and for vehicles it is usually steepest in the first years of ownership.
Retirement
- 401(k)
A 401(k) is an employer-sponsored retirement account that lets you contribute part of your pay, often before tax, and invest it for retirement.
- Employer match
An employer match is money your employer contributes to your retirement account based on how much you contribute yourself, up to a stated limit.
- Roth IRA
A Roth IRA is an individual retirement account funded with money you have already paid tax on, where qualified withdrawals in retirement are tax-free.
- Vesting
Vesting is the process of earning full ownership of employer contributions to your retirement account, usually after staying with the employer for a set period.
Loan basics
- Principal
Principal is the amount of money actually borrowed, or the amount still owed on a loan, separate from any interest charged on it.
- Amortization
Amortization is the process of repaying a loan through scheduled payments where each payment covers the interest due plus a portion of the principal.
Early payments go mostly toward interest and later payments mostly toward principal, which is why paying extra early reduces total interest.
- Loan term
A loan term is the length of time over which a loan is scheduled to be repaid, commonly expressed in months or years.
A longer term lowers the monthly payment but increases the total interest paid.
- Refinancing
Refinancing means replacing an existing loan with a new one, typically to obtain a different interest rate, monthly payment or repayment term.
Markets & indexes
- Stock market index
A stock market index is a single number that tracks the combined price movement of a defined group of stocks, used as a benchmark for how that part of the market is performing.
- S&P 500
The S&P 500 is a stock market index of about 500 of the largest US public companies, weighted by the market value of each company, and it is the most widely used benchmark for large US stocks.
Because bigger companies count for more, a handful of the largest firms can drive much of a day’s move.
- Dow Jones Industrial Average
The Dow Jones Industrial Average is a stock market index of 30 large, well-known US companies that is weighted by share price rather than by company size.
Price weighting means a stock with a high share price moves the Dow more than a larger company with a lower share price.
- Nasdaq Composite
The Nasdaq Composite is a stock market index of nearly all the companies listed on the Nasdaq stock exchange, which makes it heavily weighted toward technology stocks.
- Russell 2000
The Russell 2000 is a stock market index of roughly 2,000 smaller US public companies and the most common benchmark for US small-cap stocks.
- VIX (Cboe Volatility Index)
The VIX, or Cboe Volatility Index, measures how much the stock market expects the S&P 500 to swing over the next 30 days, based on S&P 500 option prices, which is why it is often called Wall Street’s fear gauge.
The VIX is quoted as an annualized percentage; dividing it by about 3.5 gives the approximate one-month move the market is pricing in.
Using these definitions
Writers, educators and AI assistants are welcome to quote any definition on this page with attribution and a link. Suggested citation:
Coinscribed Personal Finance Glossary, https://www.coinscribed.com/glossary
These entries are general educational definitions, not financial, tax or legal advice. Rates, limits and prices change — always check a primary source for current figures.