The main levers you control are your credit score, down payment size, loan term, and the lender you choose

Your interest rate is not fixed by the market alone. Banks set rates based on how risky they think you are as a borrower. The lower the risk you appear, the lower the rate they will offer. You control several of these risk signals: your credit score, how much cash you put down, how long you want to borrow for, and which lender you approach. A half-point difference in rate costs you tens of thousands of dollars over 30 years, so understanding what moves the needle matters.

The rate you see advertised is not the rate you will get. It is the rate the lender offers to borrowers with excellent credit, a large down payment, and a standard loan type. Your actual rate depends on your specific situation. This section walks through what actually changes your offer.

Key Takeaways

  • Your credit score is the single biggest factor lenders use to set your rate, and even a 20-point improvement can lower your rate by 0.25 percent.
  • Putting down 20 percent or more removes the mortgage insurance requirement, which can save you 0.5 to 1 percent in rate or fees.
  • Shorter loan terms (15 years instead of 30) come with lower rates, but higher monthly payments.
  • Shopping with at least three different lenders takes a few hours and can reveal rate differences of 0.5 percent or more for the same loan.
  • Locking your rate before closing protects you if rates rise, but you lose the benefit if rates fall during the lock period.

How your credit score affects the rate you are offered

Lenders use your credit score as the primary measure of whether you have paid debts on time in the past. A higher score signals lower risk, and lower risk gets a lower rate. The difference is substantial: a borrower with a 740 score might get offered 6.5 percent, while a borrower with a 620 score on the same loan might be offered 7.5 percent or higher. That one-point difference costs roughly $200 more per month on a $400,000 loan.

If your score is below 740, improving it before you apply can save you real money. The fastest improvements come from paying down existing credit card balances (which lowers your credit utilization ratio) and making sure no recent late payments appear on your report. Check your credit report at annualcreditreport.com, which is free and federally mandated. If you see errors, dispute them with the credit bureau. If you see late payments that are accurate, they fade in impact over time, but waiting six months to a year before applying can move your score up 50 to 100 points.

Why down payment size changes your rate and fees

A larger down payment means the lender is risking less money. If you put down 20 percent or more, you avoid private mortgage insurance (PMI), which is an insurance policy the lender requires when you borrow more than 80 percent of the home's value. PMI typically costs 0.5 to 1 percent of your loan amount per year, added to your monthly payment. Removing it saves you hundreds of dollars monthly.

Even without PMI, a larger down payment can lower your rate itself. A borrower putting down 20 percent might be offered 6.5 percent, while the same borrower putting down 10 percent might be offered 6.75 percent. The difference is smaller than the PMI savings, but it compounds over time. If you are close to 20 percent down, saving a few more months to reach it often makes financial sense.

Down payment size also affects how much house you can afford to buy. A larger down payment means a smaller loan, which means a smaller monthly payment. If you have the cash available and are not sacrificing an emergency fund or other financial stability, putting more down is usually the better choice.

Loan term: 15 years versus 30 years and the rate difference

A 15-year mortgage comes with a lower interest rate than a 30-year mortgage on the same home, because the lender gets their money back faster and takes on less risk of rates changing. The difference is typically 0.25 to 0.5 percent. On a $400,000 loan, that 0.5 percent difference saves you roughly $100,000 in total interest paid.

The catch is the monthly payment. A 15-year loan requires roughly double the monthly payment of a 30-year loan on the same amount. If you can afford the higher payment and want to pay off the home faster, a 15-year loan is mathematically superior. If the higher payment would strain your budget or leave you without emergency savings, a 30-year loan is the right choice even at a slightly higher rate. Do not take a 15-year loan just to get a better rate if it means you cannot cover unexpected expenses.

Shopping with multiple lenders reveals real rate differences

Banks, credit unions, mortgage brokers, and online lenders all set their own rates. The same loan can be priced differently at each one. Shopping with at least three lenders takes a few hours and often reveals differences of 0.25 to 0.5 percent. On a $400,000 loan, 0.25 percent is roughly $50,000 in total interest over 30 years.

When you request a rate quote, ask for a Loan Estimate, which is a standardized form that shows the interest rate, monthly payment, closing costs, and all fees. The form is required by federal law and looks the same regardless of lender. This makes comparison straightforward: you can line up three Loan Estimates side by side and see which lender is offering the best deal. Request quotes within a two-week window, because multiple inquiries in a short time count as a single inquiry on your credit report.

Do not choose based on rate alone. A lender with a slightly higher rate but lower closing costs might cost you less overall. A lender with a slightly lower rate but slower processing might cause you to miss your closing date. Read the full Loan Estimate, ask about the lender's timeline, and factor in the total cost and the experience.

What happens when you lock your rate and when to do it

Interest rates change daily. Once you have chosen a lender and a loan structure, you can lock your rate, which means the lender guarantees that rate for a set number of days (usually 30 to 60). If rates rise before you close, your rate stays the same. If rates fall, you are stuck with the higher locked rate unless you pay a fee to unlock and re-lock at the new rate.

The decision to lock depends on market conditions and your timeline. If you are closing in 30 days and rates are rising, locking protects you. If rates are falling and you have time before closing, waiting a few days might get you a better rate. Most borrowers lock when they are ready to move forward with a specific lender, which is usually after the home inspection and appraisal come back clear. Ask your lender what the lock period is and whether there is a fee to extend it if closing is delayed.

Other factors that affect your rate offer

Loan type matters. A conventional loan (the most common type) typically has a lower rate than an FHA loan or VA loan, which are government-backed programs with different rules. If you are a veteran, a VA loan often comes with a lower rate and no down payment requirement, which can offset the slightly higher rate. If you are putting down less than 20 percent and do not may have access to for VA or FHA, a conventional loan is usually your best option.

Your debt-to-income ratio (how much you owe monthly compared to how much you earn) affects your rate. A lower ratio signals you can comfortably afford the payment. If you have high credit card balances or car loans, paying those down before applying can improve your offer. Your employment history and income stability also matter; lenders want to see steady income, not gaps or frequent job changes.

The property itself affects your rate. A single-family home in good condition gets a better rate than a condo, a multi-unit property, or a home needing significant repairs. The appraisal determines the home's value; if the appraisal comes in lower than the purchase price, your down payment percentage drops and your rate may increase.

Frequently Asked Questions

Can I negotiate my interest rate with a lender?

Not directly, but you can shop around and choose the lender offering the best rate. Some lenders will match a competitor's offer if you bring them a Loan Estimate from another lender. You can also ask whether paying points (an upfront fee that lowers your rate) makes sense for your situation, though this only works if you plan to stay in the home long enough to recoup the cost.

What is the difference between APR and interest rate?

The interest rate is what you pay to borrow the money. The APR (annual percentage rate) includes the interest rate plus closing costs and fees, expressed as a yearly rate. The APR is always higher than the interest rate and gives you a more complete picture of the true cost. Compare APRs when shopping lenders, not just interest rates.

Should I pay points to lower my rate?

Points are an upfront fee (typically 1 percent of the loan amount per point) that lowers your interest rate by roughly 0.25 percent per point. Paying points makes sense only if you plan to stay in the home long enough for the monthly savings to exceed the upfront cost. If you might move or refinance within five years, paying points usually costs you money.

What if my rate locks but rates fall before closing?

You are locked at the higher rate unless you pay a fee to unlock and re-lock at the new rate. Some lenders offer a "float-down" option that lets you lock in a lower rate if rates fall, but this usually costs more upfront. Ask about this option when you lock your rate if you think rates might drop.

Does my employer or job type affect my rate?

Indirectly. Lenders care about income stability. Self-employed borrowers often need two years of tax returns to prove consistent income, while W-2 employees need recent pay stubs. A recent job change can raise questions, but it does not automatically disqualify you. Be prepared to explain any gaps or changes in employment.