When the 10-year draw period closes and the outstanding balance gets recast as fully amortizing principal and interest, HELOC payment shock is the abrupt jump that hits. With the WSJ Prime Rate at 7.50% and Bankrate’s national HELOC average at 7.47% on June 17, 2026, most borrowers crossing the conversion line right now see their minimum payment climb 35% to 90% on the first repayment bill. A 2015-vintage line opened on a 10-year draw recasts in 2025 or 2026. The math is mechanical.
What HELOC payment shock actually is
The HELOC is two products bolted together. During the draw period (usually 10 years), the borrower can pull from the line and most servicers accept interest-only minimums calculated as balance times annual rate divided by 12. On a $50,000 balance at 7.5%, that’s $312.50 a month. At end of draw, the line freezes to new advances and the same balance is reamortized over the repayment period, typically 20 years but sometimes 15 or 10.
The draw period vs. the repayment period
The Reg Z disclosure schedule, codified at 12 CFR § 1026.40, treats these as two phases of one plan. The draw phase carries the variable Prime-tied rate and the interest-only option that makes the line feel cheap. But the repayment phase keeps the variable rate and adds principal. The payment becomes whatever the lender’s amortization formula produces on the current balance over the contractually fixed repayment term.
Why the payment jumps overnight
The recast adds principal to a payment that previously carried only interest. And two borrowers with identical balances and identical rates can see materially different post-conversion payments based entirely on whether the note specifies a 10-year, 15-year or 20-year repayment period.
Pull the note before doing anything else.
How variable Prime-tied rates compound the shock
Most HELOCs adjust monthly with the WSJ Prime Rate, currently 7.50% as of late June 2026 (Fed Funds plus 3.00%). If Prime moves up between now and the conversion date, the amortization recalculates on the higher rate, which lifts the new payment further. And if Prime drifts down later in 2026 (as Bankrate’s forecast contemplates), the new payment drifts with it. Any forecast is a forecast.
Which HELOC vintages are resetting in 2026
The 2015 and 2016 origination cohort opened on 10-year draws is hitting end of draw right now. Behind it, a second wave is queued and waiting. HELOC originations jumped from 207,422 lines in Q2 2021 to 291,736 in Q2 2022 per MBA data, and average commitment volume at repeat-reporting lenders grew 41% from 2020 to 2022. Those boom-era lines convert between 2030 and 2032 on the standard 10-year clock, or earlier on shorter draws.
The NY Fed’s Liberty Street Economics team documented that the mortgage lock-in effect, with most homeowners sitting on sub-4% first mortgages, pushed HELOC demand higher than usual through 2023 and into 2026. Because cash-out refinancing was unattractive for those owners, they used HELOCs to access equity instead. That choice front-loaded the conversion calendar for the early 2030s.
The math on your next payment
So what does the shock actually look like in dollars? Run the worked example on a $50,000 balance at 7.5%. The interest-only draw payment is about $313 a month. Recast over 20 years, the principal and interest payment is roughly $403. Over 15 years it’s roughly $464. Over 10 years it’s roughly $594 – nearly double the draw bill. The 20-year recast lifts the payment 29%. The 10-year recast nearly doubles it, which sounds bad on paper and feels worse on the first bill, because the first bill is when it stops being a spreadsheet exercise.
To estimate your own figure, take the current statement balance, multiply by the current annual rate, divide by 12, and write down the interest-only payment. Then run the same balance, rate and repayment term through any standard amortization calculator. The result is what the first repayment bill will look like if rates don’t move between now and conversion.
The 2026 rate environment you are converting into
Bankrate’s June 17, 2026 national HELOC average is 7.47%. Typical pricing for well-qualified borrowers runs 7.5% to 9.5% depending on credit and combined LTV, with credit unions occasionally posting around 7.75% for borrowers with strong files. Bankrate’s home equity rate forecast contemplates a drift into a 7.25% to 9.00% range later in 2026 if the Fed delivers additional cuts. Treat that as forecast.
Your end-of-draw timeline
Here’s the practical reality: this is a 24-month runway, not a six-month scramble. Twenty-four months out, pull the HELOC agreement and confirm the exact conversion date and the repayment term it specifies (the 2014 Interagency Guidance instructs lenders to communicate proactively, and most servicers send end-of-draw notices 6 to 24 months ahead – but the contractual date in the note governs, not the notice). Twelve months out, estimate the converted payment at current rates and at a stress-tested rate 100 basis points higher, then pull a recent home value estimate to check combined LTV. At the six-month mark, get two written quotes on the exit option that fits, whether a new HELOC, a HELOAN or a cash-out refinance, and confirm whether the current servicer offers an in-place fixed-rate lock. On the conversion date itself, confirm the new amortization schedule in writing and verify the rate index, margin and repayment term match the original note. Thirty days after conversion, reconcile the first repayment bill against your estimate. If the figures don’t match, call the servicer the same day.
The four ways to handle the transition
| Option | Typical 2026 rate | Equity required | Best fit borrower | Key risk |
|---|---|---|---|---|
| New HELOC | 7.47% average, variable | 15% to 20% remaining | Wants flexibility, can tolerate rate variability | Resets the 10-year draw clock and keeps Prime exposure |
| HELOAN | ~7.75% fixed (forecast) | 15% to 20% remaining | Wants budget certainty on a fixed P&I schedule | Pays a rate premium versus current variable HELOC pricing |
| Cash-out refinance | At or near current 30-year first-mortgage pricing | 20% remaining after refi | First mortgage already at or above current rates | Surrenders a sub-4% first mortgage if one exists |
| In-place fixed-rate conversion or workout | Set by current servicer | Varies | Wants to avoid origination costs, or is showing payment stress | Availability varies by lender and may not cover the full balance |
For the HELOAN path see the fixed-rate HELOAN vs. cash-out refinance comparison. For the cash-out path, run the break-even math first, and if a junior HELOC will sit behind the new first mortgage you’ll need a HELOC subordination agreement.
The mortgage lock-in trap
Borrowers who originated a first mortgage between 2020 and early 2022 are usually sitting on a fixed rate below 4%. So cash-out refinancing to clear a HELOC means surrendering that note and resetting the first lien at current 30-year pricing, which sits substantially higher. The blended cost of carrying the new, larger first mortgage almost always exceeds the cost of paying down the HELOC on its own schedule or replacing it with a HELOAN. Run the math and expect the answer.
Cash-out refinance is the wrong door for that cohort.
Special considerations and common questions
Can you refinance a HELOC before the draw ends?
Yes, and it’s usually easier than refinancing after the recast begins. Underwriters prefer borrowers who aren’t yet under payment stress, so files priced at 12 months before the conversion date tend to clear cleanly – before the servicer flags the file as approaching end-of-draw and before any payment-shock stress shows up in the bureau data competing lenders pull.
What happens if your home value has dropped?
If combined LTV pushes past 80% to 85%, the new-HELOC and HELOAN paths narrow quickly. Pricing tiers worsen, some lenders cap their exposure, and the in-place conversion option (the one your existing servicer controls) becomes more important by default.
What if you cannot qualify for a new line at all?
If credit or income has slipped enough that no new line qualifies, the conversation moves to loss mitigation with the current servicer: workout modification, in-place fixed-rate lock if offered, or a structured repayment plan. Borrowers should also know their rights when a lender freezes or reduces the line under Reg Z.
Do lenders have to notify you before the draw period ends?
No specific federal mandate sets the notice timeline. The 2014 Interagency Guidance instructs lenders to communicate proactively, and most servicers send notices 6 to 24 months ahead. But the contractual conversion date in the original note is what governs.
Can a HELOC be converted to a fixed-rate loan?
Some servicers offer an in-place fixed-rate conversion on all or part of the outstanding balance. Where that feature isn’t available, replacing the line with a HELOAN delivers the same fixed-payment outcome through a new origination.
Can you extend the draw period?
The contract specifies a fixed conversion date and most lenders won’t move it. The practical extension is a refinance into a new HELOC, which resets the 10-year draw clock at current pricing and terms.
A quick note on interest deductibility after conversion
The TCJA acquisition-indebtedness rule and the OBBBA changes that followed govern whether interest on the converted balance remains deductible. The mechanics turn on what the original draw was used for and on current cap rules. See the dedicated explainer on HELOC interest deductibility under TCJA and OBBBA for the full breakdown.
Your next concrete step
Pull the HELOC statement and the original note. Confirm the conversion date and the repayment term. Multiply the current balance by the current rate, divide by 12, and write down the interest-only figure. Then run the same balance and rate through an amortization calculator for the contractual repayment term and write down the P&I figure. The difference between those two numbers is the payment shock. If it’s more than the household can absorb, get two written quotes six months out.
