A mortgage rate is the percentage of interest a lender charges you on the money you borrow to buy a home. It determines how much you pay each month on top of repaying the loan itself, and even small differences in rate can add up to tens of thousands of dollars over the life of a loan. If you borrow $300,000 at 6% instead of 7%, you save roughly $200 per month and over $70,000 in total interest on a 30-year mortgage.
How Your Rate Turns Into a Payment
Your monthly mortgage payment depends on three things: the loan amount, the loan term (how many years you have to repay), and the interest rate. Lenders use a standard formula that spreads repayment evenly across every month of the loan, but the split between principal (the amount that reduces your balance) and interest shifts over time.
In the early years, most of each payment goes toward interest because the outstanding balance is still large. As you pay down the principal, the interest portion shrinks and more of your payment chips away at the balance. This structure is called amortization. On a $350,000 loan at 6.5% over 30 years, your first payment sends roughly $1,896 toward interest and only $317 toward principal. By year 20, those numbers have nearly flipped.
Interest Rate vs. APR
When you shop for a mortgage, you’ll see two numbers: the interest rate and the APR, or annual percentage rate. The interest rate is the pure cost of borrowing the money. The APR is a broader measure that folds in additional costs like lender fees, mortgage broker fees, and discount points (upfront fees you can pay to lower the rate). The APR will almost always be slightly higher than the interest rate because it captures those extra charges.
Comparing APRs across lenders gives you a more accurate picture of total borrowing cost than comparing interest rates alone. A lender offering 6.25% with $8,000 in fees may actually cost more than one offering 6.375% with $3,000 in fees, and the APR makes that easier to spot.
What Drives Mortgage Rates Up or Down
Mortgage rates respond to a mix of broad economic forces and your personal financial profile. On the economy side, rates tend to follow the yield on 10-year Treasury bonds, which reflects investor expectations about inflation and economic growth. When investors expect higher inflation, they demand higher returns, and mortgage rates rise in tandem.
The Federal Reserve influences rates indirectly. The Fed sets a benchmark short-term interest rate that affects banks’ borrowing costs, which eventually filters into mortgage pricing. But the Fed doesn’t directly set mortgage rates. When the Fed holds its benchmark rate steady or raises it, mortgage rates tend to stay elevated or climb. When it cuts, mortgage rates often drift lower, though not always by the same amount or on the same timeline.
How Your Credit Score Affects the Rate
Two borrowers applying for the same loan on the same day can receive very different rates based on their credit profiles. The CFPB’s rate exploration tool illustrates the gap clearly: a borrower with a 625 credit score might see offers ranging from about 6.125% to 8.875%, while someone with a 700 score could see offers between roughly 5.875% and 8.125%. That potential difference of a full percentage point or more translates to significant money over 30 years.
Beyond credit score, lenders also weigh your down payment size, debt-to-income ratio (how much of your monthly income goes toward debt payments), the property type, and the loan amount. A larger down payment generally earns a lower rate because the lender takes on less risk. Loan amounts that exceed conforming loan limits, which are set annually by the Federal Housing Finance Agency, often carry slightly higher rates.
Fixed-Rate vs. Adjustable-Rate Mortgages
A fixed-rate mortgage locks in the same interest rate for the entire loan term, whether that’s 15, 20, or 30 years. Your principal and interest payment never changes, which makes budgeting straightforward. The tradeoff is that fixed rates are typically higher than the introductory rates on adjustable-rate mortgages.
An adjustable-rate mortgage (ARM) starts with a lower initial rate that stays the same for a set period, often 5, 7, or 10 years. After that introductory window closes, the rate resets at regular intervals based on a market index plus a fixed margin set by the lender. If the index rises, your payment goes up. If it falls, your payment may go down, though not all ARMs allow downward adjustments.
ARMs come with caps that limit how much the rate can change at each adjustment and over the life of the loan. For example, a common cap structure might limit the first adjustment to 2 percentage points, each subsequent adjustment to 2 points, and the lifetime increase to 5 points above the initial rate. These caps protect you from extreme jumps, but your payment can still increase substantially over time. ARMs tend to make the most sense if you plan to sell or refinance before the fixed period ends.
Mortgage Points and Buying Down Your Rate
When a lender quotes you a rate, they may also offer the option of paying discount points upfront to lower it. One point costs 1% of the loan amount and typically reduces your rate by roughly 0.25 percentage points, though the exact reduction varies. On a $400,000 loan, one point costs $4,000.
Whether points make sense depends on how long you plan to keep the mortgage. Divide the upfront cost by the monthly savings to find your break-even point. If paying $4,000 saves you $65 a month, you break even in about 61 months, or just over five years. If you expect to stay in the home longer than that, buying points can save you money overall.
How to Get the Best Rate
Rates vary meaningfully from one lender to the next, so getting quotes from at least three lenders is one of the simplest ways to save. Research from Freddie Mac has found that borrowers who get multiple quotes can save thousands over the life of their loan.
Beyond shopping around, a few concrete steps improve the rate you qualify for. Raising your credit score before applying, even by 20 or 30 points, can move you into a lower pricing tier. Paying down existing debts improves your debt-to-income ratio. Saving for a larger down payment reduces the lender’s risk. And choosing a shorter loan term, like 15 years instead of 30, almost always comes with a lower rate, though the monthly payment will be higher because you’re paying off the balance faster.
Once you find a rate you’re comfortable with, ask the lender about a rate lock. This guarantees your quoted rate for a set period, usually 30 to 60 days, while your loan is processed. If rates rise during that window, you’re protected. Most lenders offer rate locks at no extra cost for standard timeframes, though longer locks may carry a small fee.