How HELOC interest rates work
Home equity lines of credit (HELOCs) are one of many tools you can use to borrow against your equity. However, HELOC payments — and how the interest is calculated — can be a little more complicated compared to other loan products.
Here’s what you need to know about how HELOC interest rates work and what you might expect to pay if you take one of these loans out.
How HELOC interest rates work
The majority of HELOCs come with variable interest rates. These rates — along with your payments — can fluctuate over time.
When you first apply for a HELOC, you’re given an initial interest rate, which is set according to a base rate (usually the prime rate), plus a margin (or extra percentage) established by the lender. Together, the base and margin rates equal your overall HELOC rate.
Here’s an example of a HELOC rate you might get:
- Prime rate: 6.75% (as of May 6, 2026)
- Margin: 2%
- Your HELOC rate: 8.75%
How often a HELOC rate will adjust depends on your loan terms, though in most cases, it’s either monthly or quarterly based on market conditions. If the base rate moves up or down, your interest rate will, too. For instance, if the prime rate moved to 8% in the example above, your HELOC rate could increase to 10%. However, if the prime rate fell to 6%, your HELOC rate could then drop to 8%.
What is the prime rate (and why does it matter)?
The prime rate (also referred to as the U.S. prime rate or The Wall Street Journal prime rate) is used by individual banks when setting rates for different kinds of loans. This rate is loosely based on the federal funds rate, which is established by the Federal Open Market Committee (FOMC) eight times per year.
Typically, the prime rate is three percentage points above the federal funds rate. In many cases, it’s the lowest rate you can get on different types of loans, though it isn’t a mandated minimum. Lenders also don’t have to adjust their prime rate if the federal funds rate changes, but they generally do.
The prime rate is often used as an “index rate.” This just means it’s the base rate that some adjustable-rate products — like HELOCs — are tied to.
Variable vs. fixed HELOC interest rates
| Feature | Variable-rate HELOC | Fixed-rate HELOC |
|---|---|---|
| Rate changes | Yes | No |
| Monthly payment | Can fluctuate | Predictable |
| Risk level | Higher | Lower |
| Availability | Common | Less common |
While the majority of HELOCs have variable rates, some lenders also offer fixed-rate options. Unlike a variable rate, a fixed rate stays the same throughout your repayment term. Other institutions might allow borrowers to lock in a fixed rate on some or all of their HELOC balance once or even several times throughout their HELOC’s term.
How HELOC interest is calculated
Because most HELOCs have variable interest rates, calculating just how much interest you’ll be charged can get complicated. The exact amount you’ll pay can often fluctuate based on both your balance and where your rate has moved recently. Because of this, you could have vastly different payments from one month to another.
Understanding how to calculate your interest is critical if you want to properly budget for (and stay on top of) your HELOC payments. Using the formula below can help you gauge your costs.
HELOC interest formula
Calculating how much interest you’ll pay in a month requires you to know three numbers: your average daily HELOC balance (you can typically find this on your monthly statement), your current interest rate, and the number of days in the billing cycle.
Once you have those numbers, follow these steps to calculate your HELOC interest:
- Multiply your average HELOC daily balance by your current interest rate.
- Take that number and divide it by 365 (the number of days in the year).
- Multiply that number by the number of days in the billing cycle you’re making a payment for.
This will tell you how much you’ll owe in interest for that specific payment date. Just remember that this doesn’t include payments toward your principal balance — just your interest charges.
HELOC interest example
To better understand how HELOC interest is calculated, it can help to look at a real-life scenario. Let’s say you have an average daily HELOC balance of $15,000 and a current interest rate of 10%, and you’re looking to calculate your interest for the month of June (30 days long).
Your calculations would look like this:
- $15,000 x 0.10 = $1,500
- $1,500 / 365 = $4.11
- $4.11 x 30 = $123.29
In this example, you’d owe $123.29 in HELOC interest for the month of June.
How often HELOC interest rates change
HELOC interest rates can change as often as once per month or once per quarter. Your HELOC rate will also typically change in the month or two following any increase or decrease in the federal funds rate.
You can keep up with these changes by monitoring the statements and meeting minutes posted at FederalReserve.gov after each FOMC meeting. These occur in January, March, April, June, July, September, October, and December each year.
What affects your HELOC interest rate?
The federal funds rate and prime rate are certainly big factors in what HELOC rate you get. However, remember that lenders also add a margin of their choosing onto those, so your personal financial situation — and the unique risk you present to a lender — is just as important.
To assess this risk and set your margin, lenders will look at these factors:
- Credit score: Your credit score and credit history reflect how well you manage and repay your debts. A good credit score typically translates to better interest rates.
- Loan-to-value (LTV) ratio: Your LTV ratio compares the size of your HELOC limit to your home’s overall value. Higher LTV ratios mean bigger monthly payments and more risk, so they’ll typically result in higher interest rates, too. Lenders will also consider your combined loan-to-value (CLTV) ratio, which factors in other loans you have on the property (like your original mortgage) in addition to your potential HELOC limit.
- Debt-to-income (DTI) ratio: This calculation shows lenders how much of your monthly income is taken up by debt payments. If you have a lot of debt and your income is stretched thin, that makes you a higher risk for missing payments. You’ll usually get a higher interest rate as a result.
- Lender conditions: Some lenders take on more risk than others or might need the business more than another company. Factors like these can impact your rate, too. This is why it’s important to shop around and compare several lender options before getting a HELOC.
- Property type: The type of property for which you’re getting a HELOC can matter, too. Typically, HELOCs on investment properties are seen as riskier, so they tend to come with higher interest rates than those on primary residences.
How HELOC payments work during the draw period
HELOC repayment terms are split into two periods: a draw period (typically 10 years) and a repayment period (typically up to 20 or 30 years). The draw period is when you can withdraw money from your HELOC and spend it as needed. During this time, you might only need to make interest payments on your HELOC, depending on the lender. This means you’d only be paying down your interest, not your principal balance.
Once the draw period is over, you’ll enter the repayment period. This is when you’ll start repaying the principal balance, plus interest, over an extended period of time. In some cases, you might owe a balloon payment, meaning the entire balance will be due.
How rising interest rates affect your HELOC
If you have a variable-rate HELOC, then your interest rate will rise if the base rate it’s tied to increases. This is typically the prime rate, so it’s important to pay attention to where this rate heads. You can monitor the U.S. prime rate daily via The Wall Street Journal.
How to get the lowest HELOC rates
HELOC rates vary widely by lender and the margin that lender adds to its base rate. For this reason, it’s important to compare rate quotes from at least a few lenders before applying for a HELOC.
Here are some other strategies that could help you qualify for a lower rate:
- Improve your credit score before applying for a HELOC.
- Lower your DTI ratio by paying down debts.
- Increase your income by taking on more hours or getting a side job.
- Borrow a smaller amount to lower the lender’s risk.
- Build more home equity than just the required 10% to 20% before applying (ideally at least 30% equity to get approved for more favorable rates).
- Address any overdue accounts, as these can make you a higher risk for lenders and result in higher interest rates.
HELOC rates vs. home equity loan rates
| HELOCs | Home equity loans | |
|---|---|---|
| Type of rate | Usually variable | Usually fixed |
| Rate basis | Prime rate + margin | General economic factors (such as bond yields, inflation, and Federal Reserve policy) and market conditions |
| Monthly payments | Interest-only during draw period (depending on the lender) | Interest + principal (starting from Day 1 of the loan) |
The primary difference between HELOC and home equity loan rates is that HELOC rates are usually variable while home equity loan rates are typically fixed. This can make home equity loans much easier to budget for. However, you’ll pay toward both the principal and interest on a fixed home equity loan as soon as the repayment term starts.
HELOCs, on the other hand, often allow you to pay only interest during the draw period. This can reduce your costs significantly early in the loan term.
Keep reading: Is a HELOC a good idea?
HELOC interest rates FAQs
HELOC rates are typically variable, meaning they change as the base rate they’re tied to fluctuates. Because of this, your payment can move up or down.
In some cases, lenders also offer fixed-rate HELOCs or, more often, the option to lock in a fixed rate on some or all of your HELOC balance at some point in the term.
HELOC interest is calculated like this: Your balance is multiplied by your interest rate and then divided by 365 days. That amount is then multiplied by the number of days in the month or billing cycle your payment is due for.
A good interest rate on a HELOC is generally considered to be a rate below the national average. This will typically look like the prime rate plus a small margin. As of May 2026, the average HELOC rate is about 7.3%, so anything below this would be an ideal rate.
Your HELOC payment will depend on a lot of factors, including how much you borrow, your interest rate, current market conditions, and the terms of your HELOC. In general, it’s best to get a personalized quote from a reputable lender to gauge what your overall borrowing costs — including your payments — could look like in your specific situation.
