Why Did My HELOC Payment Go Up? Prime Rate Hits 7.00% After the Fed Hike — What Texas Homeowners Should Do Before Oct 28

If your home equity line of credit statement looked a little higher this month, you're not imagining it. On September 16, 2026, the Federal Reserve raised its target range by a quarter point to 3.75%–4.00%, its first hike since 2023. Banks moved the prime rate from 6.75% to 7.00% the same day. Almost every HELOC in Texas is priced off prime, so the increase flowed straight into variable-rate equity lines.

I'm Bond Peter Njoku (NMLS #2670329), a mortgage loan officer in Garland. Most of what's written about the Fed this fall is about 30-year mortgage rates. That's a different mechanism, which I covered in my post on the September hike and rate locks. This post is for the homeowner who already has a HELOC balance and wants to know three things: why the payment moved, what happens if the Fed hikes again at its October 27–28 meeting, and whether it's time to lock in a fixed rate.

Why does a Fed hike change my HELOC payment but not my mortgage?

Because they're priced differently.

• A HELOC rate = prime rate + your margin. Prime has sat exactly 3 percentage points above the top of the Fed's target range for decades. When the Fed moves, prime moves the same day, and your HELOC typically adjusts at your next billing cycle or two.
• A fixed-rate first mortgage is set once at closing. Your principal and interest never change. New 30-year rates follow the 10-year Treasury, not the Fed directly, which is why they can rise or fall on a day the Fed does nothing.

Your margin is in your HELOC agreement. In DFW I commonly see margins between 0% and 2% depending on credit score and combined loan-to-value. If your agreement has a floor rate or a lifetime cap, those apply too.

How much did my HELOC payment go up?

During the draw period, most HELOCs require interest-only payments. Here's what the September move did, assuming a margin of 1% (so 7.75% before the hike and 8.00% after), plus what another quarter-point hike would do:

The quick rule: every 0.25% move costs about $10.42 a month for each $50,000 you owe on an interest-only line. That's the math: $50,000 × 0.25% ÷ 12.

If you're past the draw period and in repayment, your payment includes principal, so the dollar increase from a rate change is a bit smaller in the short run, but the payment is already larger. Repayment periods on Texas HELOCs often run 10 to 20 years.

Will the Fed raise rates again on October 28?

Nobody knows, and I'd be suspicious of anyone who says they do. What we know for certain: the Fed's next decision is Wednesday, October 28, 2026, at the end of its October 27–28 meeting, and its September projections showed most officials expecting at least one more hike before year end. NPR's October 7 coverage described borrowing costs across mortgages, cars and student loans climbing alongside bond yields that are near multi-decade highs.

That means the honest planning assumption for a HELOC borrower is: your rate could go up again, and it's unlikely to go down soon. If a 0.25% increase on your balance wouldn't change your budget, you may be fine staying put. If it would, look at a fixed-rate option now rather than after another adjustment.

What are my fixed-rate options in Texas?

There are four, and Texas law puts the same guardrail on all of them: your total borrowing against your homestead generally can't exceed 80% of the home's value.

For most DFW homeowners I talk to, the cash-out refinance is the wrong answer right now, because it means giving up a first mortgage rate that's often in the 3s, 4s, or 5s to refinance the whole balance at today's 7.40% (Freddie Mac PMMS, week of October 8, 2026). A fixed second lien leaves that first mortgage alone. My cash-out vs HELOC comparison runs the blended-rate math in detail.

A Mesquite homeowner deciding whether to lock

Here's a composite case. A Mesquite couple has a $210,000 first mortgage at 3.875% on a home worth about $400,000, and they drew $80,000 on a HELOC at prime plus 1% to remodel their kitchen and pay off a car. At 8.00%, their interest-only payment is $533.33, up $16.67 from August. Their plan was to pay the line down over 8 to 10 years.

Their combined loan-to-value is ($210,000 + $80,000) ÷ $400,000 = 72.5%, under Texas's 80% cap. A full cash-out refinance at 7.40% would have cost them their 3.875% rate on $210,000, so we ruled it out immediately. Their lender offered a fixed-rate lock on the HELOC balance for a small fee, at a rate comparable to a fixed second lien. Because they planned a long payoff and were worried about another hike, they locked $60,000 and kept $20,000 variable to pay down first. Total cost to make the move was under $100, and the variable portion is small enough that another quarter-point hike adds about $4 a month.

Can I even take a HELOC in Texas, and how is it different?

Yes, but Texas HELOCs come with constitutional rules most states don't have. Under Section 50(t) of the Texas Constitution, the line generally must keep total home borrowing at or below 80% of value, each draw has a minimum size, and you can't access it by debit card or credit card. I explain each rule in my Texas HELOC rules guide, and the broader equity-borrowing boom in my post on the HELOC surge and the 80% cap.

What should I do before October 28?

1. Find your margin, floor, and cap in your HELOC agreement.
2. Calculate your exposure: balance ÷ $50,000 × $10.42 per quarter-point.
3. Call your HELOC lender and ask whether it offers a fixed-rate lock option, the fee, and the locked rate.
4. Compare it against a fixed second lien if your lender doesn't offer a lock, or if the lock rate is high.
5. Leave a low-rate first mortgage alone unless the numbers clearly say otherwise.

If you want a second set of eyes on the math, I'll run your actual balance, margin, and first-mortgage rate and show you the cheapest route.