What Affects Your Mortgage Interest Rate?

A rough rule of thumb: every 1% change in rate changes your monthly payment by about $60 per $100,000 borrowed. On a $360,000 loan, a 1% difference is roughly $216/month — or about $77,760 over the life of a 30-year loan.

That's why two buyers with the same income, same home price, and same lender can end up with meaningfully different monthly payments. The rate is the multiplier on everything else.

Your credit score is the single biggest lever you control. Lenders use it to price the risk that you'll stop paying. A higher score means lower risk means lower rate.

If you're planning to buy in 12–24 months and your score has room to improve, it's often worth the wait. Paying down revolving credit balances and correcting any errors on your credit report are the fastest ways to improve your score before applying.

Different loan programs carry different rates:

• Conventional loans (backed by Fannie Mae/Freddie Mac) generally offer the most competitive rates for borrowers with strong credit and sufficient down payment.
• FHA loans often have slightly lower rates than conventional loans but add mortgage insurance premiums that increase the effective cost. Good for lower credit scores.
• VA loans typically offer the lowest rates of any program for eligible borrowers — plus no down payment and no PMI. If you qualify, get a VA loan.
• Jumbo loans (above conforming loan limits, currently ~$766,550 in most areas) carry higher rates because they can't be sold to Fannie/Freddie. Typically requires 10–20% down and excellent credit.

Shorter terms typically come with lower rates. A 15-year mortgage usually runs 0.5–0.75% lower than a 30-year. This further amplifies the interest savings of the shorter term beyond just having fewer payment periods.

The tradeoff: the lower rate on the 15-year doesn't fully offset the higher required monthly payment. But it does make the 15-year even more attractive from a total interest perspective.

Your loan-to-value ratio (LTV) — how much you're borrowing relative to the home's value — affects your rate. More equity means less risk for the lender, which can mean a slightly lower rate.

The benefit is modest compared to credit score, typically 0.1–0.25% for moving from 10% to 20% down. But it compounds: a lower rate plus no PMI adds up meaningfully.

Mortgage points are upfront fees paid to the lender in exchange for a lower interest rate. One point = 1% of the loan amount. Paying one point typically reduces your rate by 0.25%, though this varies by lender and market conditions.

Whether to buy points depends on your break-even timeline. If a point costs $3,600 and saves you $60/month, it takes 60 months (5 years) to recoup the upfront cost. If you plan to sell or refinance before then, points don't help you. If you're buying your forever home, they can make sense.

This is one of the most impactful things buyers skip. Studies consistently show that getting just one or two additional quotes can save $1,000–$3,000 over the first five years of the loan — through lower rates, lower fees, or both.

Lenders price risk differently and have different cost structures. A credit union, a national bank, and an online lender may quote meaningfully different rates for the same borrower on the same day. The only way to know is to ask all three.

Multiple credit inquiries for mortgage shopping within a 14–45 day window (depending on the credit model) count as a single inquiry on your credit report. Don't let fear of credit impacts stop you from shopping.

When you're ready to compare, use the Loan Estimate — a standardized document lenders are required to provide within 3 days of application — to compare rates, points, and fees apples-to-apples across lenders.