How Interest Rates Affect Home Equity Loan Payments and Total Cost

A higher rate means bigger monthly payments and thousands more in interest over the life of your loan—here's exactly how the math works.

By Garret Merkley · Explainer · Jun 6, 2026

Branched from Home Equity Loans vs. HELOCs: What's the Real Difference?

Quick take

Interest rate changes directly increase or decrease your monthly payment and total interest paid over the loan term.
A 1% rate difference can cost you tens of thousands of dollars on a $100,000 loan over 10 years.
Fixed-rate home equity loans lock in your rate; variable rates start lower but can spike, raising payments unpredictably.
Your rate depends on credit score, loan amount, equity position, and current market conditions.

A home equity loan is a fixed-amount loan secured by your home's equity, repaid over a set term (typically 5–15 years) with a fixed or variable interest rate. The interest rate you're offered determines two critical numbers: how much you pay each month and how much interest you'll pay in total. Even small rate differences compound into thousands of dollars over time.

How the Interest Rate Affects Your Monthly Payment

Your lender uses an amortization formula to calculate a fixed monthly payment that covers both principal and interest. The higher the interest rate, the more of each payment goes toward interest rather than paying down the loan balance. On a $100,000 home equity loan over 10 years, a 6% rate costs about $1,110 per month, while an 8% rate costs about $1,213 per month—a $103 monthly difference. Over the full 10 years, that small monthly gap adds up to roughly $12,360 in extra payments.

The Total Interest Cost Over Time

The real impact of interest rates shows up in total interest paid. On the same $100,000 loan over 10 years, 6% interest costs about $33,200 in total interest, while 8% costs about $45,600—a difference of $12,400. Extend the term to 15 years and the gap widens further: 6% costs roughly $50,900 in interest versus $71,400 at 8%, a difference of $20,500. The longer your loan term, the more interest rate matters.

Fixed vs. Variable Rates and Payment Certainty

Fixed-rate home equity loans lock in your interest rate for the entire loan term, so your monthly payment never changes. This makes budgeting predictable but typically comes with a slightly higher initial rate. Variable-rate home equity loans (sometimes called HELOCs or adjustable-rate loans) often start with a lower introductory rate that adjusts periodically—usually annually or every few years—based on a market index plus a lender margin. If rates rise, your payment rises too, sometimes dramatically. A loan starting at 5% variable might jump to 7% or 8% after the intro period, instantly raising your monthly payment and extending how long it takes to pay off the loan.

What Determines Your Interest Rate

You don't get the advertised rate—lenders set your rate based on several factors. Your credit score is the biggest lever: a score above 740 typically qualifies for the best rates, while scores below 660 can mean 1–2% higher rates. Loan-to-value (LTV) ratio matters too; borrowing 50% of your home's equity is safer for the lender than borrowing 80%, so lower LTV often means a lower rate. The loan amount, your income, employment history, and current market rates all play a role. During periods of rising Fed rates, all home equity loan rates tend to climb.

Why This Matters and When It Applies

Interest rates matter most when you're comparing loan offers or deciding between fixed and variable terms. A 1% difference might seem small, but it translates to hundreds of dollars per year and tens of thousands over the life of the loan. If you have a strong credit score and stable income, shopping around for the best rate can save you significantly. If you're planning to pay off the loan quickly (within 3–5 years), a variable rate's lower intro rate might make sense; if you need predictability and plan to hold the loan longer, fixed is safer. Rising-rate environments make fixed rates more attractive despite higher initial rates.

Rate Shopping Saves Real Money

Get quotes from at least 3 lenders; rates vary by 0.5–1.5% even for the same borrower.
Ask whether the rate is fixed or variable, and if variable, what the rate caps are (how high it can go).
Compare the total interest cost over the full term, not just the monthly payment.
A 0.5% rate difference on a $100,000 loan over 10 years saves roughly $6,000 in interest.

Loan Amount	Term	Interest Rate	Monthly Payment	Total Interest
$100,000	10 years	5%	$1,061	$27,300
$100,000	10 years	6%	$1,110	$33,200
$100,000	10 years	7%	$1,161	$39,300
$100,000	10 years	8%	$1,213	$45,600
$100,000	15 years	6%	$844	$50,900
$100,000	15 years	8%	$956	$71,400

Can I refinance my home equity loan to a lower rate?

Yes. If rates drop or your credit score improves, you can refinance into a new loan at a better rate. You'll pay closing costs (typically 2–5% of the loan amount), so make sure the interest savings over the remaining term justify the upfront expense. It usually makes sense if you can save 0.5% or more and plan to keep the loan for at least a few more years.

What's the difference between a fixed rate and an ARM (adjustable-rate mortgage)?

A fixed rate never changes; an ARM (or variable rate) starts low but adjusts periodically based on market conditions. ARMs often have rate caps—a ceiling on how high the rate can go—but these are usually high enough to still sting. Fixed rates are more predictable; ARMs are riskier but cheaper upfront.

How much does my credit score affect the rate I'm offered?

Significantly. Borrowers with scores above 740 might get 5.5%, while those with scores of 660–679 might pay 7% or higher for the same loan. A 100-point credit score improvement can lower your rate by 0.5–1%, saving thousands over the loan term.

If I pay off my home equity loan early, do I save on interest?

Yes. Interest accrues daily, so paying off early reduces the total interest you owe. However, check for prepayment penalties (some lenders charge fees if you pay off early), though these are less common on home equity loans than on mortgages.

What happens to my rate if the Fed raises rates?

If you have a fixed-rate loan, nothing—your rate stays the same. If you have a variable rate, your rate will likely rise when your next adjustment period hits. This is why variable rates are risky in a rising-rate environment.

Sources

Payment calculations based on standard amortization formula: M = P[r(1+r)^n]/[(1+r)^n-1], where P = principal, r = monthly interest rate, n = number of payments.