Interest Rate

Your mortgage interest rate is the cost of borrowing money, expressed as a percentage per year. If you borrow $300,000 at a 7% interest rate, you're paying 7% of the outstanding balance per year in interest, though that's spread across your monthly payments and calculated on the declining balance over time.

The interest rate directly determines most of your monthly payment amount. A lower rate means a lower payment and less interest paid over the life of the loan. A higher rate means the opposite.

Interest rates change constantly based on economic conditions, Federal Reserve policy, and the bond market. The rate you get also depends on your credit score, loan type, down payment, and the lender you choose.

Even a small difference in interest rate has a significant impact over the life of a 30-year mortgage. The difference between a 6.5% and a 7.0% rate on a $300,000 loan is roughly $100 per month, and around $36,000 over 30 years.

Shopping multiple lenders and comparing rates (not just the advertised rate, but the APR) is worth the effort. A lender's rate often reflects their fees and overall competitiveness.

Two buyers purchase identical $320,000 homes with 10% down, borrowing $288,000 each. Buyer A locks in at 6.75% and pays $1,868/month in principal and interest. Buyer B locks in at 7.25% and pays $1,965/month. Over 30 years, Buyer A pays $34,920 less in interest, a substantial difference from a single percentage point.

"The interest rate is all I need to compare loan offers."

The interest rate is important, but it doesn't tell the full story. The APR includes the rate plus lender fees, giving you a better apples-to-apples comparison of loan costs. A low interest rate with high fees can be more expensive overall than a slightly higher rate with no fees.