Interest Rate
Your mortgage interest rate is the percentage your lender charges you each year to borrow their money — think of it as the rental fee for using someone else’s cash to buy a house. It’s the single biggest factor in determining your monthly payment, but it doesn’t tell the whole borrowing cost story the way APR does.
How Your Rate Gets Set
Mortgage rates aren’t random. They follow the 10-year Treasury yield, get adjusted for lender profit margins, and then get further tweaked based on your personal risk profile. A 780 credit score might get you 6.50% while a 660 score gets quoted 7.25% on the same day for the same loan amount.
Rates also vary by loan type. Conventional 30-year fixed loans tend to run 0.25-0.50% higher than 15-year fixed. ARMs usually start lower than fixed rates but carry risk later. FHA and VA loans often come in slightly below conventional rates.
Dollar Example
On a $400,000 loan over 30 years, the difference between 6.50% and 7.00% is $107/month. That’s $38,520 over the life of the loan. At 7.50%, you’d pay $213 more per month than at 6.50% — or $76,680 total. Even a quarter-point matters at these dollar amounts.
Watch Out
Lenders love advertising their lowest rate, but that rate usually requires excellent credit, 20%+ down, and paying discount points. The rate you actually qualify for could be meaningfully higher. Always ask for the rate and the APR on your specific scenario before comparing lenders.
Don’t confuse interest rate with APR. Your interest rate determines your monthly payment. Your APR includes fees and reflects total borrowing cost. Two lenders could offer the same rate but different APRs — that means one is charging more in fees. Check our comparison tool to stack offers side by side.
Real-World Example
Two buyers get quotes on the same day for a $350,000 30-year fixed mortgage. Buyer A has a 780 credit score and gets 6.50%. Buyer B has a 660 score and gets 7.25%. Buyer A’s monthly payment: $2,212. Buyer B’s payment: $2,388 — that is $176/month more, or $63,360 over the life of the loan. The 75-point credit score difference translates to a 0.75% rate gap, costing Buyer B the equivalent of a new car. This is why improving your credit score before applying can save tens of thousands of dollars.
Run the Numbers
Use our mortgage calculator to see how interest rate applies to your specific situation. Plug in your numbers and compare scenarios before making any financial commitments.
Related Terms
Understanding interest rate connects to several other concepts: APR, ARM, Fixed-Rate Mortgage, and Refinancing. Each of these terms interacts with interest rate in ways that affect your buying power, monthly costs, or investment returns.
Frequently Asked Questions
Can I negotiate my mortgage interest rate?
Absolutely. Lenders have wiggle room, especially if you bring a competing offer. Get quotes from at least three lenders, then ask your preferred one to match or beat the lowest. Negotiating even 0.125% lower on a $350,000 loan saves around $9,000 over 30 years.
What is the difference between interest rate and APR?
Your interest rate is the annual cost of borrowing expressed as a percentage — it determines your monthly payment. APR includes the interest rate plus fees (origination, points, mortgage insurance) and reflects the true total cost of borrowing. Two lenders offering the same rate can have very different APRs depending on their fee structures.
Should I pay points to lower my rate?
One discount point costs 1% of your loan amount and typically reduces your rate by 0.25%. On a $400,000 loan, one point costs $4,000 and saves about $57/month. The break-even point is roughly 70 months (about 6 years). If you plan to keep the loan longer than that, paying points saves money overall.