I'm Bond Peter Njoku (NMLS #2670329), and since the Fed's September 16, 2026 rate hike pushed 30-year fixed rates in Texas up toward 7.25%, I've had more DFW clients ask me about adjustable-rate mortgages than at any point in the last few years. That's consistent with what's happening nationally — Mortgage Bankers Association data from January 2026 showed ARM applications up 113.1% year-over-year, now running around 7.7% of all applications. As of late September 2026, DFW quotes put 30-year fixed around 7.25%, 15-year fixed around 6.5%, and 7/1 ARMs around 6.625% — a real spread, but one that comes with real tradeoffs. Here's the actual math, not just the sales pitch.
ARM vs. fixed-rate: the full comparison
| Feature | 30-year fixed | 5/1 ARM | 7/1 ARM |
|---|---|---|---|
| Rate stays fixed for | Entire 30-year term | First 5 years | First 7 years |
| Approx. DFW rate (late Sept 2026) | ~7.25% | ~6.35%–6.50% | ~6.625% |
| Index after fixed period | N/A | SOFR + margin (typ. 2.50–3.00 pts) | SOFR + margin (typ. 2.50–3.00 pts) |
| Payment predictability | Complete, for the life of the loan | Predictable for 5 years, then variable | Predictable for 7 years, then variable |
| Best fit | Staying 7+ years, want zero rate risk | Confident you'll move/refinance within 5 years | Some uncertainty about your 5–7 year plan |
| Worst-case risk | None | Rate adjusts sooner, less time to refinance out | Rate adjusts later, more time to plan around it |
Show me the real numbers: $400,000 loan
On a $400,000 loan, a 7.25% 30-year fixed rate runs about $2,728.71 a month in principal and interest. A 7/1 ARM at 6.625% runs about $2,561.24 a month — a savings of roughly $167 a month, or just over $2,000 a year, for the first seven years. That's real money. But it's only worth taking on if you understand what happens after year seven.
What happens when the fixed period ends?
Today's ARMs are indexed to SOFR, with lenders typically adding a margin of 2.50 to 3.00 percentage points on top of it, subject to caps on how much your rate can move at the first adjustment and over the life of the loan. If your rate adjusted to a worst-case 8.625% on that same $400,000 loan, your payment would rise to roughly $3,111 a month — about $550 more than you were paying, and about $383 more than the 30-year fixed payment you could have locked from day one. I show every ARM client that worst-case number up front, not just the attractive introductory rate.
The misconception that trips up most first-time buyers: how ARMs are actually underwritten
Buyers often assume an ARM's low starting rate is what they get qualified at. It isn't. Underwriters generally require you to qualify at the fully-indexed rate or a stress-tested higher rate — the point being to make sure you can handle the payment after the rate adjusts, not just during the honeymoon period. That means an ARM usually won't stretch your purchasing power as far as buyers expect going in, even though your actual monthly payment is lower for those first several years.
Why the ARM-fixed spread widened after the Fed's September hike
Earlier in 2026, ARM rates in DFW were running only 30–40 basis points below 30-year fixed rates — a gap narrow enough that the risk of an ARM often wasn't worth the modest savings. After the Fed's September 16 hike, fixed rates jumped further and faster than ARM start rates, widening that spread to roughly 60 basis points by late September. A wider spread makes the ARM math more compelling, but spreads move — what looks like a good trade this month isn't guaranteed to still look that way when you actually lock.
Named scenario: a Frisco move-up buyer with a 5-to-7-year plan
I'm working with a family moving up to a $550,000 home in Frisco who know, with reasonable confidence, they'll likely relocate again for work within six years. We compared a 30-year fixed at 7.25% against a 7/1 ARM at 6.625% on their loan amount, and the ARM saves them roughly $230 a month for at least the first seven years — money they're putting toward their kids' 529 accounts instead. Because their timeline genuinely lines up with the ARM's fixed period, and because they qualified comfortably even at the fully-indexed stress-test rate, this was a case where the ARM math actually worked in their favor. I don't recommend that combination for everyone — only for buyers whose real plans and qualifying numbers both support it.
How do I decide which one is right for me?
Start with your honest timeline — how long do you realistically expect to stay in this home — then let me run your actual qualifying numbers both ways, including the ARM's worst-case adjusted payment, before you commit to either one.
Frequently Asked Questions
How does an ARM get me approved for a loan if the rate can change?
I'm Bond Peter Njoku (NMLS #2670329) and this is the most common misunderstanding I run into. Underwriters don't qualify you at that low introductory ARM rate — most loan programs require qualifying at the fully-indexed rate or a stress-tested higher rate, precisely so you're not approved for a payment you can't actually afford once the rate adjusts. That means your maximum purchase price with an ARM is usually closer to what it would be with a fixed rate than buyers expect. Call or text me at 469-545-7180 and I'll run your specific qualifying numbers both ways.
Is a 5/1 or 7/1 ARM better for a DFW buyer right now?
I'm Bond Peter Njoku (NMLS #2670329). A 7/1 ARM gives you two extra years of rate protection compared to a 5/1, which matters more the less certain you are about your timeline. If you know you're relocating again for work or plan to sell within 5 years, a 5/1 can price slightly better. If there's real uncertainty about whether you'll move by year 5, I generally steer DFW clients toward the 7/1 for the extra buffer. Call or text me at 469-545-7180 and I'll compare both against your actual plans.
What happens to my payment when my ARM's fixed period ends?
I'm Bond Peter Njoku (NMLS #2670329). Your rate resets based on the current SOFR index plus your loan's margin, subject to caps that limit how much it can move at the first adjustment and over the life of the loan. On a $400,000 loan, moving from a 6.625% start rate to an 8.625% adjusted rate — a full 2-point worst-case first adjustment — would raise your payment from about $2,561 to roughly $3,111 a month. I always walk clients through that worst-case number before they choose an ARM, not just the best case. Call or text me at 469-545-7180 and I'll show you your loan's specific cap structure.
Is the ARM vs. fixed spread big enough to matter in DFW right now?
I'm Bond Peter Njoku (NMLS #2670329). As of late September 2026, DFW ARM rates are running roughly 60 basis points below 30-year fixed rates, which is a wider gap than the 30-40 basis points seen earlier this year, mostly because fixed rates jumped further after the Fed's September 16 hike while ARM start rates moved less. That's a real, meaningful spread right now — but it can narrow again, so I look at your specific numbers rather than a rule of thumb. Call or text me at 469-545-7180 and I'll show you today's actual spread.
Not sure if an ARM or fixed rate fits your plans?
I'm Bond Peter Njoku (NMLS #2670329). Let's run your real numbers — including the ARM worst-case payment — before you decide. Call or text me at 469-545-7180, message me on WhatsApp, or start your pre-approval online.