What an interest-only payment means on a HELOC
An interest-only payment on a home equity line of credit (HELOC) means you pay only the interest that has accrued on your borrowed balance—you do not pay down the principal. If you have borrowed $50,000 at 8% annual interest, an interest-only payment covers roughly $333 that month, but the $50,000 you owe stays the same.
Most HELOCs have a draw period, usually 5 to 10 years, during which you can borrow money and make interest-only payments. After the draw period ends, the HELOC moves into a repayment period, typically 10 to 20 years, when you must pay both principal and interest—and you can no longer borrow new money.
The appeal of interest-only payments is lower monthly cost during the draw period. The catch is that your debt does not shrink, and when the repayment period begins, your payment roughly doubles because you now owe principal on top of interest.
Key Takeaways
- Interest-only payments cover only accrued interest, leaving your borrowed balance unchanged month to month.
- Most HELOCs allow interest-only payments during a draw period of 5 to 10 years, then require principal payments during a repayment period of 10 to 20 years.
- Your payment amount changes if your interest rate is variable, because the rate can move up or down based on market conditions.
- When the repayment period starts, your monthly payment typically increases sharply because you must now pay both principal and interest on the full balance.
How the draw period and repayment period work together
During the draw period, you have access to a credit line—say $100,000—and you can borrow against it whenever you need cash. You might draw $30,000 in month one, another $20,000 in month six, and leave the rest untouched. You pay interest only on what you have actually borrowed, not on the full credit line.
Once the draw period ends, the HELOC converts to a repayment-only account. You can no longer borrow new money. Your lender calculates a new payment amount based on the total balance you owe, the remaining repayment period, and your interest rate. This payment now includes both principal and interest, so it is substantially higher than your interest-only payment was.
Some lenders allow you to make principal payments during the draw period even though they are not required. Doing so reduces the balance you carry into the repayment period and lowers your payment when the conversion happens.
How interest accrues and how your payment is calculated
Interest on a HELOC accrues daily based on your outstanding balance and your current interest rate. If your rate is 7% and you owe $40,000, the daily interest is roughly $7.67 (calculated as $40,000 × 0.07 ÷ 365). Your lender adds this daily amount to your account, and at the end of the month, you receive a statement showing the total interest owed.
Your interest-only payment is straightforward the total interest that accrued during the billing period. If $230 in interest accrued, your interest-only payment is $230. The payment does not reduce your balance; it only stops interest from compounding (being added to your balance and earning interest on top of itself).
If your HELOC has a variable interest rate—which most do—your rate can change monthly or quarterly based on a benchmark like the prime rate. When your rate changes, your interest accrual changes, and so does your interest-only payment. A rate increase means a higher payment; a rate decrease means a lower one.
What happens when the draw period ends
On the day your draw period ends, your HELOC stops functioning as a line of credit. You cannot borrow more money. Your lender sends you a new payment schedule based on your current balance, the repayment period length, and your interest rate at that time.
The payment shock can be significant. If you owed $60,000 at the end of your draw period and your new repayment period is 15 years at 7% interest, your monthly payment jumps from roughly $350 (interest-only) to approximately $560 (principal and interest combined). Some borrowers are unprepared for this increase and struggle to pay.
A few lenders offer options to soften this transition: some allow you to extend the draw period, refinance the HELOC into a new one, or convert the balance to a fixed-rate loan. These options vary by lender and depend on your credit and home equity at the time of conversion.
The risk of interest-only payments and variable rates
Interest-only payments carry two main risks. The first is that you build no equity during the draw period—your home's value may rise, but your debt does not fall, so your equity cushion stays flat. If home values drop or you need to sell quickly, you may owe more than your home is worth.
The second risk is rate volatility. Most HELOCs use a variable rate tied to the prime rate, which can move up or down. If rates rise significantly during your draw period, your interest-only payment rises with them. A 2% rate increase on a $50,000 balance adds roughly $83 to your monthly payment. Over a 10-year draw period, sustained rate increases can make the interest-only payment unaffordable before the repayment period even begins.
Some lenders offer rate caps—a maximum rate your HELOC can reach—but these vary widely. Read your HELOC agreement carefully to understand whether your rate has a cap and what it is.
Comparing interest-only to principal-and-interest payments during the draw period
Some HELOC borrowers choose to pay principal and interest from the start, even though they are not required to. This costs more each month but shrinks your balance over time and reduces the payment shock when the repayment period begins.
| Payment Type | Monthly Cost (Example) | Balance After 10 Years | Repayment Period Payment |
|---|---|---|---|
| Interest-only | ~$350 | $60,000 (unchanged) | ~$560 |
| Principal + interest | ~$560 | ~$20,000 (reduced) | ~$240 |
The table assumes a $60,000 balance, 7% interest rate, and a 15-year repayment period. Paying principal and interest from the start costs $210 more per month during the draw period but saves roughly $320 per month when the repayment period begins—and you owe far less overall.
Frequently Asked Questions
Can I switch from interest-only to principal-and-interest payments mid-draw?
Yes. Most lenders allow you to increase your payment at any time during the draw period. You can continue making interest-only payments one month and switch to principal-and-interest payments the next. There is no penalty for paying more than the minimum.
What happens if I do not pay the interest-only payment?
If you miss an interest-only payment, the unpaid interest typically gets added to your balance, and you begin paying interest on that interest. Your lender may also charge a late fee and report the missed payment to credit bureaus. Repeated missed payments can trigger default and allow the lender to freeze your credit line or demand repayment of the entire balance.
Can my lender change my HELOC terms during the draw period?
Lenders can change the interest rate on a variable-rate HELOC, and they can also freeze or reduce your credit line if your credit score drops or home value falls significantly. They cannot unilaterally shorten the draw period or force you into repayment early unless you default. Check your HELOC agreement for the specific terms your lender can modify.
Is there a way to avoid the payment increase when the draw period ends?
You can refinance the HELOC balance into a new HELOC or a home equity loan before the repayment period begins. You can also pay down the balance during the draw period so less principal is owed when repayment starts. Some lenders allow you to extend the draw period, though this is less common and depends on your creditworthiness and home equity at that time.