Yes, a HELOC is interest only, but only during its draw period. That phase typically runs 5 to 10 years, and the minimum payment your lender bills each month covers just the interest on what you’ve borrowed. When the draw period ends, the loan flips into a repayment period where every payment includes both principal and interest, and the monthly bill can climb sharply.1Chase. HELOC Draw and Repayment Periods: What Are They
The Draw Period Is Where Interest-Only Applies
A HELOC has two phases, and they behave very differently. The draw period usually lasts 5 to 10 years. During that stretch you can borrow against your credit line, pay some back, and borrow again, similar to a credit card secured by your home equity.1Chase. HELOC Draw and Repayment Periods: What Are They Most lenders set the minimum monthly payment during this time at the interest owed on your outstanding balance. Nothing more is required.
That is what “interest only” means in a HELOC context. It is a feature of the draw period, not the loan itself. You are always free to pay more than the minimum, and any extra dollar goes straight to principal. That reduces what you owe and restores that amount to your available credit line.
Paying only the minimum has a specific consequence worth understanding before you sign anything. If you borrow $50,000 and pay only interest for five years, you still owe $50,000 on day one of year six. The debt does not shrink on its own. Federal regulations require lenders to warn you upfront if minimum payments could leave you facing a balloon payment when the draw period ends.2Consumer Financial Protection Bureau. Requirements for Home Equity Plans – 12 CFR 1026.40
What an Interest-Only Payment Actually Looks Like
The appeal of the interest-only phase is the low monthly cost. On a $50,000 balance at an 8.25% rate, the interest-only payment is roughly $344 a month. That number is tempting, and it is also misleading if you treat it as the true cost of the loan. It is the rental fee on the money, not repayment of it.
Because the rate is variable — more on that below — even the interest-only payment can change from month to month. A rate increase raises what you owe in interest, so the “minimum” is a moving figure, not a fixed one.
When Interest-Only Ends: The Repayment Period
Once the draw period closes, the HELOC converts into something that behaves like a closed-end loan. You can no longer withdraw funds. Your lender recalculates the monthly payment so the remaining balance fully amortizes — principal and interest together — over the repayment period, which commonly runs 10 to 20 years.3Chase. How Does HELOC Repayment Work
The change in monthly cost is the part most borrowers underestimate. Take that same $50,000 balance at 8.25%. The interest-only payment during the draw period is about $344. When repayment begins on a 15-year schedule, the new payment jumps to roughly $485, a 41% increase. On a 10-year repayment schedule, it climbs to about $614, nearly 80% higher than the interest-only amount.
The shock is worst for borrowers who drew heavily and never paid down principal. It gets worse still if interest rates have moved up in the years since the loan opened, because the same variable rate that governed your interest-only payments also governs your amortized ones. Most of the financial trouble people run into with HELOCs starts here, not with the interest-only structure itself, but with treating those low draw-period payments as the permanent cost of the loan.
Why the Rate — and Your Payment — Can Move
HELOCs almost always carry variable interest rates. Your rate is built from two pieces: an index and a margin. The index is a public benchmark, and most lenders use the U.S. prime rate, which stood at 6.75% as of March 2026.4Board of Governors of the Federal Reserve System. Selected Interest Rates (Daily) – H.15 The prime rate follows Federal Reserve policy closely; when the Fed moves its target rate, banks adjust prime within days.5Board of Governors of the Federal Reserve System. What Is the Prime Rate, and Does the Federal Reserve Set the Prime Rate
The margin is a fixed percentage the lender adds to the index based on your credit and loan-to-value ratio at closing. If your margin is 1.5% and prime is 6.75%, your HELOC rate is 8.25%. The margin stays put for the life of the loan; the index moves, and your rate moves with it, sometimes as often as monthly. Federal rules require lenders to disclose a lifetime cap on how high the rate can climb, along with any periodic caps limiting how much it can change in a single adjustment.6eCFR. 12 CFR 1026.40 – Requirements for Home Equity Plans
Some lenders offer a fixed-rate conversion option, letting you lock a portion of your variable balance into a fixed rate that gets repaid on its own schedule, often 5 to 30 years. That can shield part of your balance from further rate increases, though lenders typically charge a fee for each lock and may cap how many locks you can hold at once.
How to Avoid Being Blindsided by the Switch
The best time to plan for the end of the interest-only phase is years before it happens. Waiting until the payment jumps leaves fewer and more expensive options on the table.
Pay extra during the draw period. Every additional dollar of principal you pay now is a dollar that will not be amortized later. Knocking a $50,000 balance down to $30,000 before the repayment period starts substantially lowers the monthly bill you will face.
Refinance into a new HELOC. This resets the clock with a fresh draw period. It comes with new closing costs and possibly a different rate, and it does not eliminate the debt, but it buys time.
Convert to a fixed-rate home equity loan. If you want a predictable payment and a set payoff date, replacing the HELOC with a fixed-rate loan locks in your cost and removes the variable-rate uncertainty.
Roll the balance into a cash-out refinance. Folding the HELOC into your primary mortgage stretches repayment over a longer term, and first-lien mortgages usually price better than second liens.
Call your lender before you fall behind. Some will modify terms or extend the repayment timeline for borrowers with clean payment histories. A HELOC is secured by your home, so the consequences of ignoring the switch are the same as ignoring a primary mortgage.
The short version: a HELOC is interest only while you are in the draw period. It is not interest only forever, and the borrowers who get hurt are almost always the ones who assumed it was.