How Are Mortgage Rates Determined? (2027 Guide)

Mortgage rates are set in two layers: a market rate that moves with the 10-year Treasury yield and mortgage-bond demand, plus what your lender adds for your credit score, down payment, loan type, property and points. As of October 29, 2026, Freddie Mac's Primary Mortgage Market Survey put the average 30-year fixed at 7.24% (15-year: 6.60%), with the 10-year Treasury at 4.98%. The Federal Reserve does not set mortgage rates: its target range was the same 3.75% to 4.00% a year earlier, when the 30-year averaged 6.17%. This 2027 guide explains both layers.

Factor	Direction	Magnitude
10-year Treasury yield	Up = higher rates	Largest market driver
Federal Reserve policy	Tightening = higher	Indirect, through Treasury yields and expectations
Inflation expectations	Up = higher	Significant
Your credit score	Higher = lower cost	0.375% to 2.75% fee at 20% down
Loan-to-Value (LTV)	Lower = lower cost	0% to 0.125% fee at 40%+ down
Loan term	Shorter = lower rate	15-yr 0.54 to 0.90 below 30-yr (2025-26)
Discount points	Pay more = lower rate	1 point = 1% of loan; cut varies
Property type	Owner-occ = lowest	Investment/second home: +1.125% to 4.125% fee

Fees: Fannie Mae LLPA Matrix dated 09.30.2026 (purchase loans, terms over 15 years). Term gap: Freddie Mac PMMS, January 2025 to October 29, 2026. You control the borrower factors, not the market ones.

The market factors

Same Fed range a year apart, yet the 30-year rose about a point along with the 10-year.

• 10-year Treasury yield: the benchmark for mortgage bonds. From January 2025 through October 29, 2026, the 30-year ran 1.81 to 2.58 points above it.
• Mortgage-backed securities (MBS): most new loans are pooled into bonds guaranteed by Fannie Mae or Freddie Mac (conventional) or Ginnie Mae (FHA, VA, USDA). The yield investors demand, plus guarantee and servicing costs, sets the rate lenders quote.
• Federal Reserve policy: the Fed targets the overnight rate banks charge each other. It raised that range 0.25 point to 3.75%-4.00% effective September 17, 2026 and held it on October 28, 2026. It now reinvests principal from its mortgage bonds into Treasury bills rather than buying more. Its pull on mortgages runs through expectations for rates and inflation.
• Inflation: higher expected inflation pushes long-term yields up. The Fed said on October 28, 2026 that "Inflation remains elevated."
• Economic growth: strong growth typically pushes rates up; recessions usually pull them down.

Your individual rate factors

• Credit score and down payment: see the grid below.
• Loan type: FHA and VA loans are excluded from that grid and priced through Ginnie Mae bonds, with their own costs (FHA mortgage insurance, the VA funding fee). Jumbo pricing is set by each lender.
• Loan term: on October 29, 2026 the 15-year averaged 0.64 point below the 30-year.
• Discount points: pay up front to lower the rate; lender credits do the reverse.
• Property and occupancy: condos, 2-4 units, second homes and investment properties cost more.
• Lender margin: varies by lender; shop multiple.

How lenders price your credit score and down payment

Fannie Mae charges lenders loan-level price adjustments (LLPAs): one-time fees, as a percentage of the loan, that lenders pass on as points or a higher rate. Freddie Mac publishes similar fees. For purchase loans with terms over 15 years:

Fees stack: at 20% down a condo adds 0.750%, and an investment property or second home 3.375%. Fannie Mae waives LLPAs for HomeReady loans and for first-time buyers with qualifying income at or below 100% of area median income (120% in high-cost areas). Near a cutoff such as 740 or 780? Raising your score first can cut the fee; see what credit score you need to buy a house.

When to lock your rate

A lock holds your rate if you close in time and your application doesn't change. The CFPB says locks usually run 30, 45 or 60 days. A locked rate can still change if your loan amount, credit score, income, down payment or appraisal changes, and extensions can be costly.

Lock when you have a contract, your file is clean, and the payment works for you. Waiting for "the bottom" is a guess, as the forecast miss above shows. If rates fall after you lock, ask whether your lender offers a float-down option and what it costs.

Always compare lenders

Get Loan Estimates from at least 2-3 lenders on the same day, with the same loan amount, same property type, and same lock period. Compare:

• Interest rate
• Discount points / lender credits
• Origination fees
• Total cash to close

Start with our Hampton Roads lender directory and closing costs guide, and see how a 1% rate increase affects your buying power.

Frequently Asked Questions

Why don't mortgage rates follow the Fed funds rate?

The Fed funds rate is an overnight bank lending rate. Mortgages are long-term loans, so they track the 10-year Treasury and the MBS market. The Fed's range was the same on October 30, 2025 and October 29, 2026; the 30-year averaged 6.17% and then 7.24%.

How does my credit score affect my rate?

With 20% down on a conventional loan, Fannie Mae's September 30, 2026 grid charges 0.375% of the loan at 780+ and 2.75% at 639 or below: $1,110 versus $8,140 on $296,000.

Should I pay discount points?

Sometimes. A point costs 1% of the loan; the rate cut depends on the lender and market. Divide the cost by the monthly savings for your break-even month, and pay only if you'll keep the loan longer.

Can I switch lenders during the loan process?

Yes, but it resets the timeline. Best done within the first week or two if at all.

Are VA loan rates set the same way?

The market layer is the same, but VA loans skip Fannie Mae's grid and go into Ginnie Mae securities; lenders still price them by credit and points. See our VA loan guide for Hampton Roads.

Why are jumbo rates different from conforming rates?

Jumbo loans exceed the conforming limit (2026: $832,750 for one unit in every Hampton Roads locality; FHFA's 2027 limit is expected in late November). Fannie Mae and Freddie Mac don't buy them, so lenders set their own pricing, higher or lower. See our jumbo loan guide.

Sources & further reading

• Freddie Mac PMMS, through Oct. 29, 2026
• U.S. Treasury daily par yield curve rates
• FOMC statement, Oct. 28, 2026
• Fannie Mae Loan-Level Price Adjustment Matrix, 09.30.2026
• Fannie Mae ESR Housing Forecast, October 2026
• FHFA 2026 conforming loan limits (Nov. 25, 2025)
• CFPB: What's a rate lock?
• CFPB: Discount points and lender credits
• CFPB: Explore interest rates
• CFPB: Loan Estimate
• VaHome analysis of REIN MLS data, September 2026

Rates, yields and fees reflect the dates shown, through October 29, 2026. Forecasts are labeled and dated. Always confirm current details with the relevant agency, lender, or licensed professional before relying on any specific figure or rule.