The Quick Read: The costliest one is leaving your rate unlocked while the market climbs. As of September 28, 2026, Freddie Mac’s 30-year average has risen four weeks in a row, and the 10-year Treasury yield has set fresh 19-year highs. A pre-approval is a snapshot, not a promise. If the market moves against a tight file before you lock, a small gap can turn into a dead deal.
I’m writing this column on September 28, 2026. Every market number below carries its source and date, and I’ve kept the sourcing tight on purpose.
Key takeaways
- Freddie Mac’s weekly 30-year average rose four straight weeks, from 6.71% (week of September 3) to 7.03% (September 24).
- The 19-basis-point jump in the week of September 17 was the biggest move of the month.
- Freddie’s number lags the daily market, so the rate you see in a headline may already be stale.
- A tight debt-to-income ratio turns a small rate rise into a real problem. That is my view, not a statistic.
- If you like the house and the numbers work today, lock. Treat it as risk control, not market timing.
What changed in September?
Rates rose every week this month, and the bond market did most of the pushing. Freddie Mac’s survey put the 30-year fixed at 6.71% for the week of September 3, then 6.76% on September 10. It reached 6.95% on September 17, a 19-basis-point jump, and 7.03% on September 24. That is the first weekly print above 7% in the run I checked. The week before the streak began, on August 27, the average was 6.66%. So the move is about 37 basis points in four weeks, and 73 basis points above the 6.30% a year earlier, per the Freddie Mac release of September 24.
A basis point is one hundredth of a percentage point. Nineteen of them in one week is a big move for a survey that usually shifts by a few.
Two cautions on that number.
First, it isn’t the whole market. Freddie Mac’s survey covers conventional, conforming, fully amortizing purchase loans for borrowers with 20% down and excellent credit. It is not a quote for you. It says nothing about non-QM borrowers at all. Terms vary by lender guidelines, property type, leverage, credit profile, and full file review.
Second, it lags. Mortgage News Daily’s commentary of September 24 says Freddie’s figure is built from survey data collected from the prior Wednesday through the day before release. The same commentary put its own daily index well above Freddie’s weekly reading and said a key threshold had already been broken earlier in the month, after inflation reports raised the risk of a Fed hike. Freddie’s weekly number confirmed a move that was already old news for anyone watching daily pricing.
The Mortgage Bankers Association shows the same direction with a different yardstick. Its survey of September 23, covering the week ending September 18, put the 30-year contract rate for conforming balances at 7.12%, up from 6.97%. Applications fell 1.5% on the week. The refinance index was 62% below a year earlier. The seasonally adjusted purchase index slipped 1%, and the unadjusted index was 11% below a year ago, per the MBA. Those levels measure different things, so don’t compare 7.03% to 7.12% and call one wrong.
Why are rates climbing?
Mortgage rates track long-term bond yields, and those yields are at levels not seen in nearly two decades. CNBC reported on September 26 that the 10-year Treasury yield leapt to 5.23% on Friday, its highest since 2007. It had traded just below 4.8% earlier in the month. Those are press-reported quotes, so check the official Treasury series if you need an exact close.
The Fed added to the mood. In its statement of September 16, the Committee voted 12–0 to raise the target range by a quarter point, to 3-3/4 to 4 percent. The same statement says inflation remains elevated. CNBC called it the first increase since 2023.
Here is a common misreading worth clearing up. The Fed does not set mortgage rates. It sets a short-term policy rate. Mortgage pricing follows the 10-year yield and the mortgage-bond market. The 10-year was already climbing before the meeting. Why yields are rising is contested. The Fed chair pointed to a stronger economy and competition for capital in the press conference. Others point to oil, deficits and inflation. I won’t pretend to settle that.
Nor will I predict the next Fed move. Published odds of an October hike differ from one outlet to the next, and one summary has the next move in December. Anyone who tells you where rates go from here is guessing.
What does the housing data say?
Buyers have more room to negotiate, but a higher rate still changes the math on any deal. NAR’s report of September 10 showed August existing-home sales down 2% from July, to a 3.98 million annual pace. Inventory rose to 1.62 million homes, or 4.9 months of supply, and the median price rose 1.6% to $429,100, per NAR’s existing-home sales data. HousingWire noted it was the first reading below 4 million since June 2025. NAR’s chief economist, Lawrence Yun, put it plainly: mortgage rates and home sales move in opposite directions. Exact terms depend on the lender’s guidelines, property type, leverage, and a full review of the borrower’s file.
Not every reading points the same way. NAR’s pending sales for August rose 0.3% on the month. Realtor.com, cited by Inman on September 1, showed contract signings 3.7% below a year earlier. Those are different measures on different bases, so both can be true.
New-home sales came in at a 684,000 annual pace for August, up 6.4% from July, per the Census Bureau’s release of September 24. Inman noted that Census did not consider that monthly change statistically significant, and that average new-home prices fell 8.8% from a year earlier. Inman also cited NAHB: in September, 38% of builders cut prices and 66% used incentives.
So this is not a crash, and I’d push back on anyone who says it is. Existing sales are still up for the year to date. It also isn’t a market where waiting is a free option. Sellers are giving ground on price and incentives. The bond market is taking that ground back through rates.
What it means for real estate investors
An investor’s loan is sized to the property’s rent, but a higher rate still shrinks the cushion. Loans built on rental income, such as DSCR loans, qualify the property on whether its rent covers the payment. A DSCR loan doesn’t lean on the borrower’s traditional employment income. That helps in a rising market, but it doesn’t shield you. When the rate rises, the debt service rises with it. The rent doesn’t move. A deal that covered comfortably at the pre-approval rate can look thin by closing.
Investors are also a growing part of the non-QM world. Optimal Blue data, syndicated on September 28, showed investor and DSCR loans above 35% of non-QM production in August. Bank-statement loans were nearly 30%. Non-QM simply means a loan that falls outside the standard agency rules, often because of how income is documented. Those borrowers were never in Freddie Mac’s sample, which is one more reason not to read a headline average as your own number.
My read: investors should run the deal at today’s cost of money, not at the pre-approval date’s. If the numbers only work at the old rate, it isn’t a deal. It’s a hope. I’d also suggest pricing in some room for the next move, since nobody knows whether the streak ends. Your pre-approval letter and the investment property loan pre-approval process are useful starting points. They are not a rate guarantee.
My take: floating is the mistake nobody sees coming
Floating your rate after pre-approval is a bet, and a tight file can’t afford to lose it. Floating means leaving your rate unlocked and hoping it falls before you close. A lock is different: it’s an agreement with the lender to hold a specific rate for a set period, so the market can move without moving your loan.
Here’s why this matters most for a specific kind of borrower. Debt-to-income, or DTI, is your monthly debt payments divided by your monthly gross income. Lenders use it to judge whether you can carry a new payment. When you have room in that ratio, a rate move of a few tenths is an annoyance. When you’re near the edge, the same move can push the ratio past what the lender’s guidelines allow. Then the loan doesn’t just cost more. It doesn’t fit.
Public data can’t tell us how many borrowers sit near that edge. That part is my professional view. I’ve watched enough markets for eighteen years in lending to know how the pattern tends to go. A small gap up, a tight ratio, and a file that worked in August stops working in October.
Try a plain hypothetical. Say a borrower is comfortable at one rate, and the market moves up by a full point before they lock. That is a large change in the monthly obligation on any mortgage. Someone with a little slack absorbs it. Someone without it has to bring more cash, find a smaller loan, or walk. None of those is a good place to be in the middle of a purchase.
The last four weeks are hindsight, and I’ll say so. They prove nothing about the next four. Rates could fall next week. My point is about risk, not prediction. Locking doesn’t get you a better rate than the market offers. It protects you from the version of the market that breaks your file.
If you like it, lock it. That’s the whole advice. It’s the one I’d give a friend.
Should you wait for a better rate?
Waiting has been the losing move for four weeks running, but that is a description, not a forecast. I hear the logic all the time. The Fed just hiked, prices are softening, surely relief is coming. It might, but nothing guarantees it. Some strategists argue that rising yields don’t necessarily signal a slowing economy, which means the drivers could stay in place longer than buyers want.
Here is what I’d weigh before deciding to float.
- What is your slack? If a rate rise would break your ratio, you can’t afford to gamble.
- What is the downside? A rate that falls a little helps you a little. A rate that rises can end the deal.
- Can you re-lock or refinance later? Some buyers plan to refinance if rates fall. That is a real option, but it is a separate bet and it isn’t free of cost. Don’t buy a house you can only carry if that refinance happens.
- What does the seller think? In a market with more inventory, a house you like may still go to a buyer who is ready.
This is a genuine toss-up for buyers with plenty of room. For everyone else, I’d take the certainty.
Other mistakes after pre-approval
Rate risk isn’t the only way to damage a file after pre-approval. It’s just the one the market is testing hardest right now. A pre-approval reflects what your credit, income and assets looked like on the day it was issued. Anything that changes that picture can change the answer.
- Taking on new debt. A car loan or a store card adds to your monthly obligations and can move your ratio the wrong way. It also triggers a new look at your credit.
- Changing jobs or income sources. Lenders verify employment again before closing. A move that looked like a step up can still create questions, especially if you’re paid differently.
- Moving money around. Large deposits or transfers that you can’t source raise flags. Keep your funds where they are and keep the paper trail clean.
- Paying off or closing accounts. It feels responsible. It can lower your reserves or change your credit profile in ways you didn’t expect.
- Co-signing for someone else. That loan counts against you as if it were yours.
- Going quiet on requests. Document requests from the lender are part of the process. Slow answers create their own risk.
- Skipping the low-appraisal conversation. If a home appraises below the contract price, talk to your agent and your loan officer at once about your options.
For investors, the same list applies, plus one more: don’t stretch the property’s rent assumption to rescue a deal. Lenders review rental income against the property and market. Optimism doesn’t count.
What I’d do now
Treat rate protection as part of the purchase plan, not an afterthought. I’m not telling anyone to buy or sell anything. I am telling you how to handle a file that’s already in motion.
1. Ask what a lock covers. Terms vary by lender and program. Find out how long it lasts and what happens if the timeline slips past it.
2. Decide before you write the offer. If you know you’ll want protection, make it part of the plan. Don’t leave it for the day something moves.
3. Compare quotes on the same day. A quote gathered in early September and one gathered last week aren’t comparable. The market moved in between. Rate shopping across dates tells you nothing.
4. Freeze your finances. Hold off on new credit, big purchases and job changes until you close.
5. Stress the deal. Run your numbers at a rate meaningfully higher than today’s. If the file still works, you have room. If it doesn’t, you have your answer.
6. Read the product page. The current guidelines for each program live on the loan options page. Everything is subject to lender guidelines and your full file, so check it before you count on any structure.
If you’re weighing a purchase or a refinance this fall, Lendmire can walk you through how the current programs fit your file.
For the end-to-end picture of how these loans work — qualification, structures, and the full process — see Lendmire’s complete DSCR loans guide.
Frequently Asked Questions
Does a pre-approval lock my rate?
No. A pre-approval tells you what a lender may be willing to consider based on your file at that time. A lock is a separate step. Until you lock, the rate can move with the market. Ask your loan officer what your lock options are and when you can use them.
Is Freddie Mac’s 7.03% the rate I’ll get?
No. That figure is a weekly average for the week of September 24, 2026, and it reflects conforming purchase loans for borrowers with 20% down and excellent credit. Your rate depends on your file, your loan type and the day you lock. Non-QM borrowers, including many investors, sit outside that sample. Every figure here varies by lender and program — guidelines, property type, leverage, and credit profile all apply.
Why did rates jump so much the week of September 17?
Freddie Mac’s average rose 19 basis points that week, to 6.95%, the biggest move of the month. The Fed hiked on September 16 and the 10-year yield had already been climbing. Mortgage rates follow bond markets more than the Fed’s policy rate, so both pushed in the same direction.
Can a small rate rise really kill a loan?
It can when your debt-to-income ratio is tight. A small increase in the payment raises the ratio, and if it crosses what the lender’s guidelines allow, the file stops working. That is my professional view, not a published statistic. The remedy is to protect the rate before it gets to that point.
Should I wait for rates to come down?
That depends on how much slack your file has. The past four weeks favored locking, but that is hindsight. No public source I found can tell you where rates go next, including the odds on the Fed’s next move. If a rise would break your file, waiting is a risk you may not want to carry.
About Lendmire
Lendmire — NMLS# 2371349 — is a mortgage brokerage whose founder writes this column. DSCR investor programs reach 41 markets, including Washington, D.C.; consumer programs such as bank statement, HELOC and down payment assistance loans are arranged in 16 states; every loan is placed with, and underwritten by, a wholesale lender under that lender’s guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.
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References
1. Freddie Mac, Mortgage Rates Average 7.03%, September 24, 2026
2. Freddie Mac, Primary Mortgage Market Survey
3. Mortgage Bankers Association, Weekly Applications Survey, September 23, 2026
4. CNBC, 10-year Treasury yield at its highest in 19 years, September 26, 2026
5. Federal Reserve, FOMC statement, September 16, 2026
6. National Association of Realtors, Existing-Home Sales
7. HousingWire, August existing-home sales, September 10, 2026
8. Optimal Blue data via KEYT, September 28, 2026
This article is part of Lendmire’s Mortgage News series — every loan program’s qualification details, guidelines, and scenarios live on the loan options page.
Related reading: What Happens After You’re Pre-Approved for a Mortgage · Why Getting Pre-Approved for a Mortgage is Important · How to Stay Focused During a Busy Homebuying Season
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
- Mortgage Loan Originator · NMLS# 1129696 · Verify on NMLS Consumer Access
- North Carolina Real Estate Broker · License# 343312 · Verify on NCREC
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- Lendmire LLC · Firm NMLS# 2371349 · Verify firm licensure
Legal disclosures. Lendmire (NMLS# 2371349) is a state-licensed mortgage brokerage that arranges financing through wholesale lender relationships. Lendmire is not a direct lender, depository institution, or registered financial advisor. The discussion above is general informational content about real estate financing — it is not financial, legal, or tax advice, and readers should consult licensed professionals for guidance on their individual circumstances. Loan inquiries are subject to lender underwriting; this article does not represent a commitment to lend. Loan terms, rates, and qualification standards vary by borrower, property, and state, and are subject to change at any time. Equal Housing Opportunity. NMLS Consumer Access: nmlsconsumeraccess.org.