What Is an Interest Rate? A Guide for U.S. Homebuyers

Introduction

The interest rate is one of the most important numbers on a mortgage. It represents the percentage the lender charges you for borrowing money. Unlike APR (Annual Percentage Rate), the interest rate focuses specifically on the cost of the loan principal — it does not include fees or other finance charges.

Understanding the interest rate helps you compare loan offers and estimate your monthly principal and interest payment. This guide explains what the interest rate is, how it differs from APR, and how it appears on your Loan Estimate and Closing Disclosure.

For a broader view of loan costs that includes fees, see our What Is APR? guide.

What This Means

The interest rate is the annual percentage charged on the loan balance. For a fixed-rate mortgage, it typically stays the same for the life of the loan. For an adjustable-rate mortgage (ARM), it may change after an initial fixed period.

The interest rate directly affects your monthly principal and interest (P&I) payment. A higher rate means a higher payment; a lower rate means a lower payment. The rate does not include property taxes, homeowner's insurance, or mortgage insurance.

Interest Rate vs. APR

Many borrowers confuse the interest rate with APR. The interest rate reflects only the cost of borrowing the principal. APR includes the interest rate plus certain fees (such as origination fees, discount points) required by federal disclosure rules.

APR is designed to help you compare the total cost of different loan offers. When comparing offers, consider both the interest rate and the APR.

How Rates Are Set

Mortgage interest rates are influenced by many factors, including:

• Market conditions and economic indicators
• Your credit score and credit history
• Loan amount and down payment (LTV)
• Loan term (e.g., 15-year vs. 30-year)
• Loan type (fixed vs. adjustable)

Lenders use these factors to price loans. Shopping with multiple lenders can help you find competitive rates.

Frequently Asked Questions

Is the interest rate the same as APR?

No. The interest rate reflects the cost of borrowing the principal. APR includes the interest rate plus certain fees and finance charges, so APR is often higher.

What affects my mortgage interest rate?

Rates are influenced by market conditions, your credit score, loan amount, down payment, loan term, and the type of loan (fixed vs. adjustable).

Where do I see the interest rate on my disclosures?

The interest rate appears on the Loan Estimate and Closing Disclosure, typically in the loan terms section.

What is a good interest rate?

Rates vary over time and by borrower. Comparing offers from multiple lenders and understanding APR can help you evaluate what is competitive for your situation.