Mortgage rates are set by a combination of financial-market conditions, lender pricing decisions, and the details of your application. Economic conditions can move the broad market, while your credit profile, loan-to-value ratio, loan type, term, points, and lender can determine the rate you are actually offered.
Rates can change even when no single event explains the move. A Federal Reserve policy decision may coincide with a mortgage-rate change, but mortgage rates do not automatically move by the same amount or on the same timetable. The most useful way to evaluate a quote is to compare written offers with identical assumptions and to consider the rate together with upfront costs.
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What determines a mortgage rate?
Freddie Mac summarizes mortgage-rate determination this way: “In general, mortgage rates are determined by a combination of various factors such as current economic conditions, the lender’s risk appetite and overhead costs, and borrowers’ credit profiles.” That framework separates forces affecting the whole market from factors that make one borrower’s quote different from another’s.
Economic conditions
Inflation, employment, economic growth, bond-market conditions and expectations about future policy all influence the cost of funding and the return investors require from mortgage-backed securities. When those conditions change, lenders may reprice new loans. The direction is not guaranteed on every day: markets respond to incoming information and to expectations, not just to one published statistic.
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Lender risk appetite and operating costs
Each lender decides how aggressively to compete, how much risk to retain or sell, and what operating expenses to recover. Staffing, compliance, servicing, warehouse financing and other overhead can be reflected in a lender’s rate or fees. Two lenders can therefore quote different prices to the same borrower on the same day.
Your credit and application profile
A lender evaluates the likelihood and severity of repayment problems. Credit history and score are important inputs, but the complete profile also includes debt obligations, income documentation, property type, occupancy, loan size and down payment. Improving credit may help a borrower qualify for better pricing, but it does not guarantee a particular rate.
Why mortgage rates change from day to day
A mortgage quote is a price in a changing market. Lenders monitor funding costs, investor demand, pipeline volume and competitive offers, then update rate sheets. A quote can change between an online search and a loan application, or between application and lock, unless the lender has locked the rate under stated terms.
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News about inflation, jobs, government borrowing or financial stress can alter market expectations quickly. Sometimes rates rise despite news that appears favorable because investors had already anticipated it. At other times, a lender’s internal capacity or risk limits cause a quote to move even while broad market measures are relatively steady.
Do mortgage rates follow the Federal Reserve?
The Federal Reserve sets a short-term policy rate, while most fixed mortgage rates reflect longer-term market pricing and lender margins. A policy-rate cut can influence economic expectations and financial markets, but it does not create a fixed, immediate, one-for-one reduction in a 30-year mortgage rate. Mortgage rates may move before, after or independently of a policy announcement.
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For that reason, “the Fed cut rates” is not enough information to predict the rate on a particular mortgage. The relevant question is how markets and lenders have repriced the specific loan you are considering.
National averages versus your personal quote
Freddie Mac’s Primary Mortgage Market Survey (PMMS) is a U.S. national weekly benchmark based on mortgage applications submitted through Loan Product Advisor. It represents a defined borrower and loan profile rather than every applicant.
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|---|---|---|---|
| 30-year fixed-rate mortgage | 7.03% on September 24, 2026 | 6.30% one year earlier | A dated weekly average for the survey profile, not a universal offer |
| 15-year fixed-rate mortgage | 6.42% on September 24, 2026 | 5.49% one year earlier | A dated weekly average; actual pricing varies by borrower and lender |
Use an average to see where the market was at a particular time, not to decide what your closing documents should show. Your loan amount, down payment, property, credit characteristics, points and fees can all produce a different result. Rates also vary by lender, so obtaining multiple written quotes is more informative than relying on one headline number.
Borrower and loan features that change an offer
Credit profile
Credit scores and payment history help a lender estimate default risk. A stronger profile can qualify for a lower rate or lower risk-based fees, while recent late payments, high balances or limited history may increase pricing. Review credit reports for errors and reduce avoidable utilization before applying, but treat any improvement as a potential benefit rather than a promised rate reduction.
Down payment and loan-to-value ratio
A larger down payment generally lowers the loan-to-value (LTV) ratio. LTV is one of the assumptions that must match when comparing quotes; otherwise a lower rate may simply reflect a different risk tier or mortgage-insurance requirement. Compare offers using the same purchase price, loan amount and down payment.
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Term and loan structure
A 15-year fixed loan usually has a different rate and payment pattern from a 30-year fixed loan. An adjustable-rate mortgage (ARM) follows a separate pricing structure. Never compare a 30-year fixed quote with an ARM’s initial rate as if they were equivalent products.
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Freddie Mac defines one discount point as 1% of the loan amount. Paying points can reduce the stated rate, but it increases cash due at closing. Other lender charges can have the same effect on the total cost even when the advertised rate is unchanged. Ask each lender to show the rate, points and fees together on a written Loan Estimate.
How to compare mortgage offers fairly
- Match the loan type. Compare fixed with fixed, or ARMs with ARMs that have the same structure.
- Match the term and loan amount. Use the same 15-, 20- or 30-year term, purchase price and down payment.
- Match points and fee assumptions. A quote with more points is not directly comparable with a zero-point quote.
- Request written estimates. Ask several lenders for the same scenario so differences are visible rather than relying on advertisements.
- Evaluate the expected holding period. If paying points lowers the rate, divide the extra upfront cost by the monthly principal-and-interest savings to estimate a break-even period. Use the actual figures in the estimates; there is no universal break-even number.
- Check lock terms. Confirm the lock period, extension charges and what happens if the closing is delayed.
The lowest displayed rate can be more expensive if it requires substantial points or fees. Conversely, a slightly higher rate may cost less upfront and suit a borrower who expects to move or refinance before the point savings are recovered.
Fixed-rate mortgages and ARMs behave differently
Fixed-rate mortgage
A fixed-rate mortgage keeps its interest rate unchanged for the loan term, assuming the loan is not refinanced or otherwise modified. Principal-and-interest payments are therefore predictable, although property taxes, insurance and association charges can change.
Adjustable-rate mortgage
An ARM often starts with a fixed introductory rate, then permits adjustments at scheduled intervals. The contract specifies:
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- Initial fixed period: how long the starting rate lasts.
- Index: a market-based reference used in the adjustment formula.
- Margin: the lender’s contractual addition to the index.
- Adjustment schedule: when the rate can reset after the initial period.
- Caps: limits on increases per adjustment and over the life of the loan.
The index alone does not determine the future rate. Read the ARM disclosure and loan documents for the exact margin, first-adjustment rule and caps. Then test whether the household budget could absorb a higher payment after a reset; an ARM should not be chosen on the assumption that refinancing will always be available.
What COFI illustrates
Freddie Mac describes the Federal Cost of Funds Index (COFI) as a benchmark used for some mortgage loans and securities. Its calculation uses monthly averages for marketable Treasury bills and Treasury notes. Freddie Mac posted a COFI value of 3.567% for August 2026 on September 18, 2026.
COFI is an example of an index, not a general mortgage-rate quote. It does not mean every ARM uses COFI, and a fixed-rate mortgage does not reset with it. The index, margin, timing and caps in your contract control an ARM adjustment.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How much can a rate difference matter?
Rate changes affect both the monthly principal-and-interest payment and the total interest paid. Freddie Mac gives an illustration in which a one-percentage-point difference changes total interest by more than $56,000 for the example loan. That figure belongs to that loan amount, term and assumptions; it is not a universal savings promise.
To analyze your own case, calculate payments for each written offer using the same balance and term. Include points, lender fees and any mortgage-insurance cost in the comparison. A payment calculator can show scenarios, but it cannot forecast future market rates or guarantee that an ARM will reset to a particular level.
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A practical rate-shopping checklist
- Check your credit reports and correct errors before requesting final pricing.
- Prepare consistent information about income, debts, assets, property value and occupancy.
- Ask each lender for the same loan type, term, amount, LTV and points assumption.
- Request both the interest rate and the dollar amount of upfront charges.
- Ask whether the quote is floating or locked, and record the lock expiration date.
- For an ARM, record the introductory period, index, margin, adjustment dates and caps.
- Compare the payment under plausible higher-rate ARM scenarios with your budget.
- Keep the Loan Estimates and note when each quote was issued; rates are time-sensitive.
Common mistakes and how to avoid them
Assuming the weekly average is your offer
Benchmarks describe a survey profile. A lender must price your actual application, and another lender may price it differently.
Chasing the lowest headline rate
A low rate can be paired with points or other charges. Compare total upfront cost and the period you expect to keep the loan.
Treating a Fed announcement as a mortgage-rate guarantee
Policy rates and fixed mortgage rates are related through broader financial conditions, not a mechanical one-for-one formula.
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Ignoring ARM reset risk
The introductory payment is not the complete cost. Read the adjustment formula and test a higher payment before selecting the product.
Comparing mismatched quotes
Different terms, down payments, loan amounts or fee structures can make one quote appear better without actually being cheaper.
What to monitor after choosing a lender
Once you select a loan, confirm the rate-lock agreement, expiration date and conditions for changes. Review the Closing Disclosure against the Loan Estimate, especially the rate, points, lender credits and cash required to close. If the loan is an ARM, keep the signed disclosure so you can verify future adjustment notices against the contract.
Mortgage pricing is time-sensitive. The September 24, 2026 PMMS figures and the August 2026 COFI value are historical observations as of those dates, not current quotes for every borrower. Recheck the lender’s written terms when you are ready to lock.
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