A $100,000 HELOC payment depends on how much you actually borrow and what interest rate you lock in

The monthly payment on a $100,000 home equity line of credit is not a fixed number—it changes based on three things: how much of that $100,000 you actually draw, what interest rate your lender charges, and whether you're in the draw period (when you can borrow) or the repayment period (when you must pay back). A HELOC is not a loan you receive all at once. It's a credit line, like a credit card backed by your home. You draw what you need, when you need it, and you only pay interest on what you've borrowed.

If you borrowed the full $100,000 at a current variable rate of around 8.5% (rates vary by lender and your credit profile), your interest-only payment during the draw period would be roughly $708 per month. If you were in the repayment period and paying principal plus interest over 10 years, that same $100,000 would cost around $1,010 per month. But these are examples, not predictions. Your actual rate depends on your credit score, your home's equity, current market conditions, and the lender you choose.

Key Takeaways

  • A HELOC payment is based only on what you borrow, not the full credit line amount, so a $100,000 line might mean a $300 monthly payment if you only draw $35,000.
  • During the draw period (usually 5 to 10 years), you typically pay interest only, which is lower but means you're not building equity in your home.
  • When the repayment period begins, your payment jumps because you must pay both principal and interest, often over 10 to 20 years.
  • Interest rates on HELOCs are variable, meaning your payment can rise or fall as the prime rate changes, unlike a fixed-rate home equity loan.
  • Your actual rate depends on your credit score, how much equity you have, and the lender—shopping around can save hundreds per year.

How the draw period affects what you actually pay

Most HELOCs have a draw period of 5 to 10 years. During this time, you can borrow and repay repeatedly, like a credit card. You only pay interest on the balance you're carrying. If you open a $100,000 HELOC but only draw $40,000 in the first year, you pay interest only on that $40,000—not the full $100,000.

At 8.5%, that $40,000 would cost about $283 per month in interest-only payments. You're not paying down the principal at all during the draw period, which means your home equity is not increasing. When the draw period ends—say, after 7 years—the HELOC converts to a repayment period. Now you can no longer draw new money, and you must pay back what you owe, usually over 10 to 20 years. That's when your payment rises significantly because you're paying both principal and interest.

What happens when the repayment period starts

The repayment period is where most borrowers feel the payment shock. If you still owe $40,000 when the draw period ends and you have 15 years to repay it at 8.5%, your monthly payment jumps to roughly $320—up from the $283 you were paying in interest only. The difference is that you're now actually paying down the balance.

If you borrowed closer to the full $100,000 and still owed $85,000 at the start of repayment, your 15-year payment at 8.5% would be around $680 per month. This is why many borrowers are surprised by their HELOC payments: they budget for the draw period but don't plan for the repayment period, which can last longer than the draw period itself and carries a much higher monthly cost.

How interest rates change your payment month to month

Unlike a fixed-rate home equity loan, a HELOC rate is variable. It's usually tied to the prime rate, which moves when the Federal Reserve changes its benchmark rate. When the prime rate goes up, your HELOC rate goes up, and so does your payment. When it goes down, your payment falls.

If you're paying interest-only on $100,000 at 8.5%, a 1% rate increase raises your monthly payment to $791—an extra $83 per month. Over a year, that's nearly $1,000 more. If you're in the repayment period, the impact is even larger because you're paying both principal and interest. This is why some borrowers convert their HELOC to a fixed-rate loan or pay down the balance aggressively before rates climb further. You can't control the prime rate, but you can control how much you borrow and how fast you pay it back.

Comparing a HELOC to a fixed-rate home equity loan

A home equity loan is different from a HELOC. With a loan, you receive the full amount upfront and make fixed monthly payments over a set term, usually 5 to 15 years. The rate is locked in, so your payment never changes. A $100,000 home equity loan at a fixed 7.5% over 10 years costs about $1,190 per month, every month, for 10 years.

A HELOC starts lower (interest-only payments of around $708 on $100,000 at 8.5%) but becomes unpredictable when the repayment period begins and when rates move. If you want certainty and plan to borrow the full amount, a fixed-rate loan is simpler. If you want flexibility—borrowing only what you need, when you need it—a HELOC makes sense, but you must plan for the payment jump at repayment time and the risk of rate increases.

What lenders actually charge and how to compare

HELOC rates vary by lender, your credit score, and how much equity you have. A borrower with a 750+ credit score and 30% equity might get 8.0%, while someone with a 650 score and 20% equity might pay 9.5%. The difference between 8.0% and 9.5% on a $100,000 balance is $125 per month during the interest-only period—$1,500 per year.

When you're shopping, ask each lender for the current rate, the draw period length, the repayment period length, and whether there are closing costs or annual fees. Some lenders charge $300 to $500 to open a HELOC; others waive the fee. A lower rate but higher fees might not save you money if you only borrow for a few years. Use a HELOC calculator from your lender to see the payment at different draw amounts and rates, then compare across at least three lenders before deciding.

Frequently Asked Questions

Can I pay only interest on a HELOC after the draw period ends?

No. Once the repayment period begins, you must pay both principal and interest. Some lenders offer the option to convert the remaining balance to a fixed-rate loan, but you cannot stay in interest-only mode indefinitely. Plan for your payment to roughly double when repayment starts.

What happens if I don't pay back the HELOC during the repayment period?

Your lender can foreclose on your home, just as they would if you stopped paying your mortgage. A HELOC is secured by your home, so defaulting puts your house at risk. If you can't afford the repayment period payment, contact your lender early to discuss options like converting to a fixed-rate loan or extending the repayment term.

Is the interest on a HELOC tax-deductible?

Only if you use the borrowed money to buy, build, or improve your home. If you use a HELOC to pay off credit cards or fund a vacation, the interest is not deductible. Keep records of how you spent the money in case the IRS asks. Consult a tax professional about your specific situation.

What's the difference between a HELOC and a cash-out refinance?

A cash-out refinance replaces your entire mortgage with a new one for a larger amount, giving you the difference in cash. You lock in a fixed rate and one payment for the full term. A HELOC is a second loan on top of your mortgage, with variable rates and a draw period. A refinance is simpler if you need a large amount upfront; a HELOC is better if you want to borrow gradually.

Can my lender freeze or reduce my HELOC credit line?

Yes. During economic downturns or if your credit score drops, lenders can reduce the available credit or freeze the line entirely. You can still repay what you've borrowed, but you cannot draw new money. This is why it's risky to rely on a HELOC as your only emergency fund—the credit line can disappear when you need it most.