How a HELOC Works
A Home Equity Line of Credit (HELOC) is a revolving credit line secured by the equity in your home. Unlike a traditional mortgage or home equity loan that provides a lump sum, a HELOC functions more like a credit card: you are approved for a maximum credit limit, and you can borrow as much or as little as you need, repay it, and borrow again during the draw period. HELOCs are popular for home renovations, debt consolidation, education expenses, and emergency funds because they typically offer lower interest rates than unsecured credit cards or personal loans. Most lenders allow you to borrow up to 80% to 85% of your home's appraised value, minus the outstanding balance on your first mortgage. For example, if your home is worth $400,000 and you owe $250,000 on your mortgage, you may qualify for a HELOC of up to $70,000 to $90,000 depending on the lender's combined loan-to-value (CLTV) requirements.
Draw Period vs Repayment Period
A HELOC has two distinct phases. The draw period typically lasts 5 to 10 years, during which you can access funds up to your credit limit and are usually required to make only interest-only payments on the amount you have borrowed. This keeps monthly payments low during the draw period but means you are not reducing the principal balance. Once the draw period ends, the HELOC enters the repayment period, which typically lasts 10 to 20 years. During this phase, you can no longer withdraw funds, and your payments increase significantly because they now include both principal and interest. Many borrowers experience "payment shock" when transitioning from interest-only to fully amortizing payments. For instance, a $50,000 balance at 8.5% costs about $354 per month during the interest-only draw period, but jumps to roughly $434 per month during a 20-year repayment period. Understanding this transition is critical for long-term financial planning.
HELOC vs Home Equity Loan
While both products tap into your home equity, they differ in important ways. A home equity loan (sometimes called a second mortgage) provides a one-time lump sum at a fixed interest rate, with fixed monthly payments over a set term, typically 5 to 30 years. A HELOC, by contrast, offers a revolving credit line with a variable interest rate that fluctuates with market conditions. Home equity loans are better suited for borrowers who need a specific dollar amount for a defined purpose, such as a kitchen remodel with a firm contractor quote. HELOCs work better for ongoing expenses or projects where costs are uncertain, because you only pay interest on what you actually draw. The interest on both products may be tax-deductible if the funds are used to "buy, build, or substantially improve" the home securing the loan, per IRS Publication 936. However, the Tax Cuts and Jobs Act of 2017 suspended the deduction for interest on home equity debt used for other purposes through 2025.
How Much Can You Borrow?
The amount you can borrow with a HELOC depends on your home equity, your lender's CLTV limit, and your financial profile. Most lenders cap the CLTV at 80% to 85%, meaning your first mortgage balance plus your HELOC limit cannot exceed that percentage of your home's current market value. To calculate your potential borrowing power, start with your home's appraised value, multiply by your lender's maximum CLTV percentage, and then subtract your existing mortgage balance. Beyond equity, lenders evaluate your credit score (typically requiring 680 or above for the best rates), debt-to-income ratio (ideally under 43%), and stable income history. Some lenders also charge annual fees, transaction fees, or early termination penalties, so it is important to compare total costs across multiple offers. Websites like CFPB's HELOC guide provide unbiased information on what to expect.
HELOC Interest Rate Factors
HELOC interest rates are almost always variable, meaning they change over time based on a benchmark index plus a margin set by the lender. The most common benchmark is the Wall Street Journal Prime Rate, which itself tracks the Federal Reserve's federal funds rate. As of early 2025, the prime rate sits at 7.50%, and typical HELOC margins range from 0.5% to 2.0%, resulting in rates between 8.0% and 9.5% for well-qualified borrowers. Some lenders offer introductory rates or the option to convert a portion of your balance to a fixed rate, which can provide payment stability. Your individual rate depends on your credit score, CLTV ratio, and the overall amount of the credit line. Borrowers with excellent credit (760+) and low CLTV ratios typically receive rates at or near prime, while those with lower scores or higher leverage pay a larger margin. Because rates fluctuate, it is wise to factor potential rate increases into your budget, especially during periods of rising Federal Reserve policy rates. Some HELOCs include rate caps that limit how much the rate can increase annually or over the life of the line, offering a degree of protection against extreme rate spikes.