A HELOC Has Two Lives
A home equity line of credit isn't one loan — it's two loans wearing the same account number:
- The draw period (typically 10 years): the line works like a credit card secured by your house. Borrow, repay, borrow again. Minimum payments are usually interest-only.
- The repayment period (typically 10–20 years): borrowing stops. Whatever balance remains is converted into a fully amortizing loan — principal plus interest — that must reach zero by the end of the term.
During the draw period, the interest-only payment is simply balance × annual rate ÷ 12. It never reduces what you owe. Ten years of faithful minimum payments leaves you owing exactly what you borrowed — a fact the small monthly number does an excellent job of hiding.
The Reset Math, In Real Numbers
Here's a $100,000 balance at 8.5% when the draw period ends, across common repayment terms:
| Phase | Monthly Payment | Jump vs. Interest-Only |
|---|---|---|
| Draw period (interest-only) | $708 | — |
| Repayment over 20 years | $868 | +23% |
| Repayment over 15 years | $985 | +39% |
| Repayment over 10 years | $1,240 | +75% |
And that's the gentle version, because it assumes the rate stays at 8.5%. Nearly all HELOCs carry variable rates tied to the prime rate. If prime has risen since you opened the line, both effects stack: a bigger required payment structure and a higher rate applied to it. Borrowers who opened HELOCs in low-rate years have watched their payment triple at reset.
The reset date was disclosed at closing — ten years earlier. A decade of small automatic payments builds a budget around the interest-only number, and the letter announcing the new payment reads like a rate hike rather than the scheduled event it is. The shock isn't hidden; it's just far away.
What the Draw Period Really Costs
Interest-only years aren't cheap years — they're deferred years. On that same $100,000 at 8.5% with a 10-year draw and 15-year repayment:
- Interest paid during the 10-year draw period: $85,000 — with the balance untouched
- Interest paid during the 15-year repayment: ~$77,000
- Total cost of borrowing: ~$162,000 in interest on a $100,000 line over 25 years
Compare that with paying principal from day one: the same $100,000 amortized over 25 years costs about $141,000 in interest — and far less if paid over 15. The draw period's convenience has a price, and it compounds quietly in the background.
Four Ways to Get Ahead of the Reset
1. Pay principal during the draw period
Nothing stops you from paying more than the interest-only minimum. Every dollar of principal you retire during the draw period shrinks the balance that gets amortized at reset. Even $200/month above the minimum on the example above cuts the reset payment meaningfully — and saves five figures in interest.
2. Refinance into a fixed home equity loan
Converting the balance to a fixed-rate home equity loan before reset swaps the variable-rate amortization for a predictable payment. Best done while your credit and home equity are strong — not after the higher payment has strained your budget.
3. Open a new HELOC (the reset-the-clock play)
Some borrowers refinance into a fresh HELOC with a new draw period. It buys another decade of low payments — but the principal still exists, now with more accumulated interest behind it. This is a deferral, not a solution, and lenders underwrite it like any new loan.
4. Roll it into a mortgage refinance
If you're refinancing your first mortgage anyway, the HELOC balance can sometimes be absorbed into the new mortgage at a lower rate. Watch the trade-off: you may be stretching that debt across 30 years.
Every option above works best 12+ months before the reset date and gets harder after it. Find your draw period end date on your statement today — if it's within two years, this is a now problem, not a later one.
See Your Own Reset Number
Enter your balance, rate, and remaining draw period — get your interest-only payment, your repayment-phase payment, and the full month-by-month schedule for both phases.
Use the HELOC Calculator →The Stakes: This Debt Is Secured by Your House
A HELOC is a second lien on your home. If the reset payment becomes unaffordable and the loan defaults, the lender can foreclose — even if your first mortgage is current. This is what separates HELOC payment shock from, say, a credit card rate hike: the downside isn't a credit score, it's the house.
If reset is approaching and the new payment genuinely doesn't fit your budget, contact the lender before missing payments. Lenders routinely negotiate extended repayment terms or modifications with borrowers who raise the issue early — and almost never with borrowers already in default.
The Bottom Line
HELOC payment shock isn't a penalty or a trick — it's the original agreement arriving on schedule. The interest-only years were always borrowed time. What separates a manageable reset from a crisis is simply when you engage with it: with a year or more of lead time, every option is open; at the reset date, most have closed.
Run your numbers in the HELOC calculator, look at the repayment-phase payment, and ask one question: does that number fit the budget? If yes, carry on. If no, you just bought yourself the time to fix it.