Interest Rate
The interest rate is the cost of borrowing money. Explore fixed and variable rates and how they influence monthly mortgage payments.
Definition
The interest rate is the percentage charged by a lender for the use of money. In mortgage lending, it represents the annual cost of borrowing expressed as a percentage of the loan amount. Interest rates may be fixed (unchanging for the life of the loan) or variable, fluctuating with market indices. Rates are influenced by economic factors such as inflation, monetary policy, credit risk, and market competition. Even small rate changes can significantly affect monthly payments and total interest paid over the loan term. Comparing interest rates and terms across lenders helps borrowers choose the most cost‑effective loan.
Why It Matters
A rate quote is not a rate. What you actually pay depends on your credit tier, loan-to-value, property type, and whether points were folded into the number you were shown, which is how two lenders quoting 6.375% end up $6,000 apart at closing. Half a point on a $500,000 loan is about $160 a month and tens of thousands over the term, so shopping is worth two afternoons.
Examples
Paying down one card lifts a borrower from 719 to 740 before application, and the pricing adjustment drops the quoted rate a quarter point.
Two lenders quote 6.5%; one loan estimate shows $9,200 in origination and discount points and the other shows $2,400.
A 45-day lock expires when title issues delay closing two weeks, and the extension costs 0.125% in points, roughly $600.
Tips
Gather loan estimates from three lenders inside a 14-day window. Scoring models treat mortgage inquiries in that window as one pull, so comparison costs you nothing.
Compare page 2, section A of each loan estimate rather than the rate on page 1. That is where origination and discount points actually live.
Ask what a lock extension costs per day and whether the lock floats down if rates fall before closing. Float-down terms are negotiable and almost never offered unprompted.
Related Terms
Variable Rate Mortgage
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Fixed-Rate Mortgage
A fixed-rate mortgage keeps the same interest rate for the loan’s life. Learn how predictable paymen...
Adjustable-Rate Mortgage (ARM)
An adjustable-rate mortgage (ARM) features a changing interest rate. Learn how initial teaser rates,...
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