A HELOC looks simple on paper. You borrow against your home equity, pay interest while you draw, then pay it back. What loan officers rarely explain clearly is that the repayment phase can hit your budget like a wall, and a surprising number of borrowers don’t see it coming until they’re already in it.

Let me fix that.

HELOC Payment Shock Calculator

Use this worked example to estimate your own payment jump when the [draw period ends](/heloc-draw-period-explained/).

Payment Transition: Draw Period → Repayment Period
Balance at End of Draw PeriodInterest-Only Payment (Draw Period)Fully Amortized Payment (15-Year Repayment)Fully Amortized Payment (20-Year Repayment)Monthly Increase (20-Year)
$50,000$354$492$434+$80
$80,000$567$787$695+$128
$120,000$850$1,181$1,042+$192
$150,000$1,063$1,476$1,303+$240
$200,000$1,417$1,968$1,737+$320
Assumptions: 8.5% APR (illustrative; your rate will vary). Interest-only = (Balance × Rate) ÷ 12. Amortized payments use standard loan formula. Shorter repayment terms increase payments further-a 10-year repayment on $120,000 at 8.5% would be approximately $1,486/month (+$636).

General information for comparison, confirm specifics for your situation.

How a HELOC Actually Works (The Part That Matters)

A home equity line of credit runs in two phases. During the draw period, typically 10 years, you can borrow up to your credit limit. Most lenders only require interest payments on what you’ve pulled. Your minimum payment on a $40,000 balance at 8.5% might be around $283 a month. Feels comfortable.

Then the draw period ends.

Now you owe principal plus interest, squeezed into 10 to 20 years depending on your loan terms. That same $40,000 balance, moving into a 20-year repayment period at 8.5%, generates a payment closer to $347. Not devastating. But most borrowers didn’t borrow $40,000. They borrowed $120,000 or more, sometimes in stages over a decade, paying only interest-only minimums the whole time. The repayment shock on a $120,000 balance can easily add $800 to $1,000 per month to your obligations.

That’s the wall.

Variable Rate Risk Is Not a Side Note

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Most HELOCs carry variable interest rates tied to the prime rate. When prime moves, your rate moves with it. This is in your loan documents, but loan officers tend to mention it once, quickly, and move on.

Here’s why it actually matters for repayment planning: your rate during the draw period might be very different from your rate when repayment kicks in. If you opened a HELOC in early 2022 and drew funds at 4%, you’re probably carrying that same balance at 8.5% or higher now. Your future repayment payment gets calculated on a rate you couldn’t have predicted when you signed.

Some lenders offer a fixed-rate conversion option, letting you lock a portion of your HELOC balance at a fixed rate. Not all do, and those that do often charge a fee or cap how many times you can convert. Read your loan agreement before you need this feature, not after.

A few lenders also offer fixed-rate HELOCs from day one. The tradeoff is usually a slightly higher starting rate and less flexibility. For someone with tight cash flow or a low risk tolerance, that tradeoff can be worth it. Freddie Mac’s home buyer resources cover some of the rate structure basics if you want plain-language explanations before you comparison shop.

What the Repayment Period Actually Looks Like Month to Month

Say you drew $80,000 over your 10-year draw period and your HELOC carries a variable rate sitting at 9% when repayment begins. Your lender calculates a fully amortizing payment over the remaining 15-year repayment term.

At 9% over 15 years, that payment is approximately $811 per month. Every single month. For 15 years. If rates rise further, that number adjusts upward.

Most borrowers still have a primary mortgage too. You might have been paying $1,800 on your first mortgage, a comfortable $283 interest-only minimum on your HELOC, and suddenly you’re looking at $2,611 combined. If your income hasn’t grown proportionally, or you’re approaching retirement, the timing creates real hardship.

I’ve reviewed files where borrowers were technically current on both loans when repayment started but 90 days delinquent on the HELOC within eight months. The shock was completely predictable. The preparation just wasn’t there.

Three Things Worth Doing Before Repayment Begins

You don’t need to wait for your draw period to end to get organized.

Know your exact payoff date. Pull your original loan documents and confirm when the draw period ends. Some borrowers have gotten the date wrong by 12 to 18 months because they confused the origination date with the draw period start date.

Model the repayment payment at a higher rate than today’s. If your current rate is 8%, model the payment at 10%. Rates don’t have to spike dramatically to make a meaningful difference on a large balance. If that higher payment would strain your budget, you need to reduce the balance now.

Consider refinancing before repayment starts. Some borrowers roll their HELOC balance into a cash-out refinance on the first mortgage, locking in a fixed rate and extending the term. It’s not free, closing costs typically run 2 to 5% of the loan amount, and it’s not always right, especially if your first mortgage has a low rate you’d lose. But for borrowers with large HELOC balances and limited repayment flexibility, it’s worth modeling carefully. A HUD-approved housing counselor can help you think through whether refinancing makes sense given your full financial picture, at no cost.

Balloons, Early Termination, and the Fine Print Nobody Reads

Some HELOCs include a balloon payment provision. Instead of a fully amortizing repayment schedule, the entire remaining balance comes due at the end of the term. More common with older HELOCs from before 2010, but it still appears. If you’re not sure whether yours has a balloon feature, look that up today.

Early termination fees are another trap. Many lenders charge $300 to $500 if you close the HELOC within the first two or three years. This catches borrowers who decide to refinance out of the product shortly after opening it.

Also check whether your lender can reduce or freeze your credit line. During 2008 to 2010, lenders froze HELOC lines en masse when property values dropped. It’s within their rights if your home value falls or your financial circumstances change. If you’re counting on future HELOC draws to fund a kitchen renovation or cover an expected expense, a frozen line can derail those plans entirely.

For a detailed walkthrough of how to read and compare loan products before you sign, The Mortgage Encyclopedia by Jack Guttentag is one of the more useful reference books in this space. (The site may earn a small commission on purchases.)

This article is for educational purposes only and does not constitute financial or mortgage advice. Mortgage rates change daily and vary by lender, loan type, credit profile, and property details. Consult a HUD-approved housing counselor (find one at hud.gov) or licensed mortgage professional for guidance specific to your financial situation.

Sources

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Disclosure: As an Amazon Associate, we earn a small commission from qualifying purchases at no extra cost to you. We only recommend products that genuinely support the topics covered in this article.