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Definition

The interest rate is the annual percentage charged by a lender for borrowing money, expressed as a percentage of the loan balance. It determines how much you pay in interest each year on top of repaying the principal.

Example

On a $280,000 mortgage at 6.5% interest, you owe roughly $18,200 in interest in the first year alone. As you pay down the balance, the dollar amount of interest you pay each month gradually decreases.

How It's Calculated

Monthly Interest = Loan Balance × (Annual Rate ÷ 12)

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The interest rate on a loan is one of the most important numbers in personal finance. Even a small difference — say 6.5% versus 7.0% — can mean tens of thousands of dollars over the life of a 30-year mortgage. Always compare APR when shopping for loans to get the true cost of borrowing.