The monthly payment on a $100,000 HELOC depends entirely on how much you draw and what interest rate you're charged—there is no fixed answer
A HELOC (home equity line of credit) is not a loan with a set payment. It works more like a credit card: you have access to $100,000, but you only pay interest on the money you actually use. If you draw $30,000 and leave $70,000 untouched, you pay interest only on the $30,000. Your monthly payment changes based on how much you've borrowed and what your lender's current interest rate is.
Most HELOCs have two phases: a draw period (usually 5 to 10 years) when you can borrow and repay as needed, and a repayment period (usually 10 to 20 years) when you can no longer draw new money and must pay down the balance. During the draw period, many lenders let you pay interest-only. During repayment, you must pay both principal and interest.
Because HELOCs use variable interest rates tied to the prime rate, your payment can jump or drop when rates change. A $100,000 HELOC at 7% interest costs far less per month than one at 10%—and your rate can shift multiple times over the life of the line.
Key Takeaways
- You pay interest only on the amount you draw, not the full $100,000 credit limit, so a $100,000 HELOC does not automatically mean a $100,000 monthly payment obligation.
- During the draw period, you can often pay interest-only, which keeps monthly payments low but means your balance does not shrink.
- Interest rates on HELOCs are variable and tied to the prime rate, so your payment can increase or decrease without warning.
- When the draw period ends and repayment begins, your payment will jump because you must now pay down principal as well as interest.
- A $30,000 draw at 7% interest costs roughly $175 per month in interest-only payments; at 10%, it costs roughly $250 per month.
How the draw period affects what you pay each month
During the draw period, most lenders offer an interest-only payment option. This means you pay only the interest that accrues on your borrowed balance each month—you do not reduce what you owe. If you draw $40,000 at 7% annual interest, your monthly interest-only payment is roughly $233. If you draw the full $100,000 at the same rate, it jumps to roughly $583 per month.
Some borrowers use this phase to pay down the balance voluntarily, which lowers their interest cost and prepares them for the repayment phase. Others draw more money over time as they need it, which increases their monthly obligation. The flexibility is the trade-off: you control how much you borrow and when, but you also control whether your balance grows or shrinks.
Not all lenders offer interest-only payments for the full draw period. Some require you to pay principal plus interest from the start, or they switch you to principal-plus-interest payments partway through. Check your promissory note or call your lender to confirm what your specific HELOC allows.
What happens when the draw period ends and repayment begins
When your draw period ends, the HELOC converts to a repayment-only phase. You can no longer draw new money, and you must pay down your entire remaining balance within the repayment period—typically 10 to 20 years. Your monthly payment now includes both principal and interest, so it rises significantly.
If you still owe $60,000 when repayment begins and your rate is 7%, a 15-year repayment period means a monthly payment of roughly $473. That same $60,000 at 10% costs roughly $635 per month. The longer your repayment period, the lower your monthly payment—but you pay more interest overall.
This transition catches many borrowers off guard. If you drew heavily during the draw period and made only interest-only payments, your balance may be nearly as large as when you started. The jump in monthly payment can be steep. Planning ahead—by paying down principal during the draw period or refinancing before repayment begins—can soften the impact.
How variable interest rates change your payment
HELOC interest rates are variable, meaning they move up and down with the prime rate set by the Federal Reserve. When the Fed raises rates, your HELOC rate rises, and your monthly payment increases. When rates fall, your payment falls. This is different from a fixed-rate mortgage or personal loan, where your rate and payment stay the same for the entire term.
The rate adjustment happens on a schedule set by your lender—often monthly, quarterly, or annually. During periods of rising rates, a $50,000 HELOC balance can see monthly payments jump by $50 to $100 or more in a single adjustment. During falling-rate periods, the opposite occurs. Over a 10-year draw period, you could see your rate move 2, 3, or even 4 percentage points in either direction.
Some HELOCs include a rate cap—a maximum rate your lender can charge, even if the prime rate climbs higher. Others have a floor, a minimum rate you pay even if the prime rate falls. Read your disclosure documents to understand what caps and floors apply to your line.
Real examples: what $100,000 in different draw scenarios costs per month
| Amount Drawn | Interest Rate | Interest-Only Payment (Draw Period) | Principal + Interest Payment (15-Year Repayment) |
|---|---|---|---|
| $25,000 | 7% | ~$146 | ~$198 |
| $50,000 | 7% | ~$292 | ~$396 |
| $75,000 | 8% | ~$500 | ~$665 |
| $100,000 | 8% | ~$667 | ~$887 |
| $100,000 | 10% | ~$833 | ~$1,055 |
These figures assume a standard amortization schedule and do not account for rate changes over time. Your actual payment will vary based on your lender's specific terms, any rate caps or floors, and whether you make voluntary principal payments during the draw period.
Why your HELOC payment might be lower than you expect
Many people assume a $100,000 HELOC means a $100,000 monthly obligation. In reality, if you draw only $20,000 and make interest-only payments at 7%, your monthly cost is roughly $117. You have access to the full $100,000, but you are not paying for money you did not borrow.
This is why HELOCs appeal to homeowners who want flexibility: you can draw what you need when you need it, and your payment scales with your actual borrowing. The trade-off is that variable rates mean your payment can rise without your permission, and the transition to repayment can be painful if you have not paid down the balance.
Frequently Asked Questions
Can I just pay interest-only forever on a HELOC?
No. The draw period ends at a date set in your promissory note—usually 5 to 10 years. When it ends, you enter the repayment phase and must pay principal plus interest. Some lenders offer the option to convert your HELOC balance to a fixed-rate loan at that point, but you cannot extend the interest-only phase indefinitely.
What happens to my HELOC payment if interest rates drop?
Your payment decreases. Because HELOC rates are variable and tied to the prime rate, when the Fed lowers rates, your lender's rate drops, and your monthly payment falls. The opposite is also true: when rates rise, your payment rises. This is why HELOCs are riskier than fixed-rate loans during periods of rising rates.
Is there a minimum monthly payment on a HELOC?
Yes, but it varies by lender. Some require you to pay at least the interest that accrues each month. Others set a minimum of $25 or $50 per month, even if your interest is lower. Check your disclosure documents or call your lender to confirm your minimum.
What if I can't afford the payment when repayment begins?
Contact your lender before the transition date. Some lenders allow you to convert the balance to a fixed-rate home equity loan with a longer repayment period, which lowers your monthly payment. Others may work with you on a modified repayment schedule. Waiting until you miss a payment makes your options much narrower.
Can my lender freeze my HELOC and force me into repayment early?
Yes. During economic downturns or if your credit score drops significantly, lenders can freeze your line (prevent new draws) and accelerate the repayment phase. This is rare but possible. Review your promissory note to understand what circumstances allow your lender to do this.