A Home Equity Line of Credit (HELOC) is a revolving credit line secured by your home, similar in structure to a credit card but typically with much larger limits and meaningfully lower interest rates, since your home backs the debt and the lender's risk is reduced accordingly. Instead of receiving one lump sum the way you would with a traditional home-equity loan, a HELOC gives you access to a pool of credit that you can draw from, repay, and draw from again over time, up to your approved limit. Understanding the two-phase structure below is the single most important thing to get right before deciding whether a HELOC fits your situation.
Most HELOCs have two distinct phases, and the difference between them is the source of the biggest surprises for first-time borrowers. During the draw period — commonly five to ten years, though this varies by lender — you can borrow against your line, repay what you've drawn, and borrow again, similar to how a credit card revolves. Many lenders only require interest-only payments during this phase, calculated on whatever balance you've actually drawn, not your full credit limit. That keeps monthly payments relatively low during the draw period, but it also means your principal balance isn't shrinking unless you voluntarily pay down more than the interest-only minimum.
Once the draw period ends, the HELOC enters its repayment period — commonly ten to twenty years. At this point you generally can no longer draw additional funds, and your required payment shifts to include both principal and interest, calculated to fully amortize the outstanding balance by the end of the repayment term. Because the repayment-period payment now includes principal, it is frequently substantially higher than the interest-only draw-period payment on the same balance — a jump often called "payment shock." A borrower who only budgeted for the draw-period payment can be caught off guard when the repayment period begins, which is why it's worth mentally modeling both phases, not just the payment you'll see in year one.
Unlike a fixed-rate mortgage, most HELOCs carry a variable interest rate tied to an underlying index (commonly the prime rate) plus a margin set by the lender based on your credit profile and the loan terms. This means your interest rate, and therefore your payment on any drawn balance, can rise or fall over the life of the line as the index moves — even if you never draw another dollar after your initial draw. Some lenders offer a fixed-rate conversion option on some or all of a drawn balance; if rate stability matters to you, ask any lender you're considering whether that option exists and what it costs. Because the rate is not locked the way a traditional fixed mortgage rate is, it's worth mentally stress-testing what a meaningfully higher rate would do to your payment on a drawn balance before you rely on today's rate environment holding steady for years.
Because a HELOC is secured by your home, missing payments puts your home at risk of foreclosure, exactly as with your primary mortgage. This is fundamentally different from unsecured debt like most credit cards or personal loans, where a missed payment damages your credit but doesn't directly threaten your housing. Before drawing a large balance, it's worth asking yourself honestly whether you could keep making payments through a period of reduced income, higher rates, or an unexpected expense — the same discipline you'd apply to any other loan secured by your home.
Home improvements, debt consolidation, education expenses, and covering large or unplanned costs are all common reasons people open a HELOC. Using a HELOC to consolidate higher-interest unsecured debt, for example, can lower your overall interest cost — but it also converts what was unsecured debt into debt secured by your home, meaning a repayment problem that once only hurt your credit score now puts your house at risk. What you use the funds for doesn't change the underlying structural risk of borrowing against your home; it only changes what you're getting in exchange for taking on that risk. A HELOC used to fund a value-adding home renovation and a HELOC used to cover routine living expenses carry the identical repayment risk to your home, even though most people intuitively feel more comfortable with the former.
Lenders generally look at your combined loan-to-value ratio (see our Methodology page for how that's calculated), your credit score, your income and existing debt obligations (debt-to-income ratio), and your payment history on your existing mortgage. Because these criteria vary meaningfully by lender, two people with the same home value and mortgage balance can receive very different HELOC offers — which is exactly why this site frames every number as an estimate to test, not a guarantee to expect.