Common Loan Terms Defined: A Plain-Language Reference

Principal

The original amount of money you borrow — before any interest is added. If you take out a $10,000 loan, $10,000 is your principal. Your monthly payments reduce the principal over time.

Interest Rate

The cost of borrowing money, expressed as a percentage of the principal per year. A 7% interest rate means you pay 7 cents annually for every dollar borrowed, before fees are factored in.

APR (Annual Percentage Rate)

A broader measure of borrowing cost that includes the interest rate plus most lender fees, expressed as a yearly percentage. APR gives you a more complete picture of what a loan actually costs than the interest rate alone.

Amortization

The process of paying off a loan through scheduled, equal payments over time. Early payments go mostly toward interest; later payments shift toward reducing the principal. A standard 30-year mortgage is a common example of an amortizing loan.

Loan Term

The length of time you have to repay a loan in full. Shorter terms generally mean higher monthly payments but less total interest paid. Longer terms lower your monthly payment but increase what you pay overall.

Origination Fee

A one-time upfront fee some lenders charge to process and fund a loan. It's usually expressed as a percentage of the loan amount and may be deducted from your loan proceeds or rolled into the balance.

Prepayment Penalty

A fee charged by some lenders if you pay off your loan early. Not all loans carry this penalty, but it's worth checking before you sign — paying off debt ahead of schedule can otherwise save you money in interest.

Collateral

An asset — such as a car or home — you pledge to a lender as security for a loan. If you default, the lender can seize the collateral. Loans backed by collateral are called secured loans. For more on how this distinction works, see our article on secured vs. unsecured loans.

Default

Failing to repay a loan according to its agreed terms, usually after a series of missed payments. Defaulting can seriously damage your credit score, trigger collections, and — for secured loans — result in the loss of collateral.

Grace Period

A window of time after a payment due date during which you can pay without incurring a late fee or being reported as delinquent. Not all loans offer a grace period, and the length varies.

Debt-to-Income Ratio (DTI)

A measure lenders use to assess how much of your gross monthly income goes toward debt payments. It's calculated by dividing total monthly debt payments by gross monthly income. A lower DTI generally improves your chances of loan approval.

Fixed vs. Variable Rate

A fixed rate stays the same for the life of the loan, making payments predictable. A variable rate can change over time based on a benchmark index, which means your payment could rise or fall. Variable rates often start lower but carry more risk.