A HELOC is not a mortgage, but it is secured by your home the same way a mortgage is

A HELOC (home equity line of credit) and a mortgage are both loans backed by your house, but they work differently and serve different purposes. A mortgage is the loan you took out to buy the house in the first place — it has a fixed term (usually 15 or 30 years), a set monthly payment, and you borrow the full amount upfront. A HELOC is a line of credit you open after you own the house, using the equity you have built up as collateral. You draw from it only when you need money, pay interest only on what you borrow, and the payment amount changes as you borrow and repay.

Both are secured loans, meaning the lender can foreclose on your home if you stop paying. But the structure, timing, and how you use the money are fundamentally different. Understanding that difference matters because it changes how much you pay, how long you have to repay, and what happens if you miss a payment.

Key Takeaways

  • A mortgage is a one-time loan to buy a house with a fixed term and payment; a HELOC is a revolving line of credit you draw from as needed after you own the house.
  • Both are secured by your home, so the lender can foreclose if you do not pay, but a HELOC typically has a shorter repayment window than a mortgage.
  • A mortgage has a fixed interest rate (usually) and a predictable monthly payment; a HELOC often has a variable rate and a payment that changes based on how much you owe.
  • You cannot get a HELOC without first owning a home and having built up equity — the lender lends you a percentage of that equity value.

How a mortgage and a HELOC are alike

Both a mortgage and a HELOC are secured loans, which means your home is the collateral. If you fail to make payments, the lender has the legal right to foreclose and sell your house to recover what you owe. Both require you to go through underwriting, where the lender checks your credit, income, and the value of your home. Both show up on your credit report and affect your credit score.

Both also involve closing costs and fees — appraisals, title searches, document preparation, and lender fees. The lender will want proof that you own the home, that there are no other claims against it (or what those claims are), and that you have the income to repay. In both cases, you are borrowing against the value of real estate, and the lender has a legal claim on that property if you default.

How a mortgage and a HELOC are different

A mortgage is a term loan — you borrow a lump sum, receive it all at once, and repay it over a fixed period (typically 15, 20, or 30 years) with a set monthly payment. A HELOC is a revolving line of credit, like a credit card backed by your home. You receive a credit limit, draw money as you need it, and pay interest only on what you have borrowed. Your payment changes month to month based on your balance.

A mortgage usually has a fixed interest rate that does not change for the life of the loan. A HELOC typically has a variable rate tied to an index like the prime rate, so your interest rate and payment can go up or down. A mortgage is designed to be repaid over decades; a HELOC usually has a shorter repayment window — often 10 years of drawing, then 10 or 20 years to repay what you borrowed.

You get a mortgage to buy a house. You get a HELOC only after you own a house and have built up equity — the difference between what the house is worth and what you still owe on the mortgage. A lender will typically let you borrow 80 to 90 percent of your home equity, depending on your credit and income.

Why the difference matters for your payments

Because a mortgage is a fixed-term loan with a set payment, you know exactly what you will owe each month for the next 15 or 30 years. That predictability makes budgeting easier and protects you from payment shock. A HELOC payment is unpredictable — it depends on how much you have borrowed and what the interest rate is at any given time. If rates rise, your payment rises. If you borrow more, your payment rises.

A mortgage also spreads the cost over a longer time, which lowers your monthly payment but means you pay more interest overall. A HELOC typically requires faster repayment, so the total interest is often lower — but only if you actually repay it on schedule. If you keep borrowing and making only minimum payments, a HELOC can become expensive quickly, especially if interest rates climb.

What happens if you cannot pay

If you miss mortgage payments, the lender will typically give you a grace period (usually 15 days) before reporting it to your credit bureau. After 30 days, it shows as late. After 120 days of missed payments, the lender can begin foreclosure. The process is slow but relentless, and you have limited options once it starts.

A HELOC works similarly — missed payments damage your credit and can trigger foreclosure — but because the balance is usually smaller and the repayment period shorter, the lender may move faster. Some HELOCs also have a clause that allows the lender to freeze your credit line or demand immediate repayment if your credit score drops or your home value falls significantly. A mortgage does not have this feature, which means a HELOC can become unavailable to you even if you have not missed a payment.

When you might use each one

You use a mortgage to buy a house. You use a HELOC to borrow against the equity you have built up for other purposes — home renovations, paying off high-interest debt, funding education, or covering a large expense. Because a HELOC is flexible and you only pay interest on what you borrow, it can be cheaper than a personal loan or credit card for large, planned expenses.

Some homeowners use a HELOC as an emergency fund — they open one and leave it unused until they need it. Others use it to fund a renovation project over time, drawing as the work progresses. The flexibility is the main advantage, but it also means you have to be disciplined about repayment, because the lender is not forcing you to pay it down the way a mortgage payment forces you to each month.

The tax difference

Mortgage interest is tax-deductible if you itemize deductions on your federal tax return (and only if your mortgage is $750,000 or less). HELOC interest is also tax-deductible, but only if you used the borrowed money to buy, build, or improve your home. If you used a HELOC to pay off credit cards or fund a vacation, the interest is not deductible.

This distinction affects the true cost of borrowing. A HELOC used for home improvements may be cheaper than it appears because the interest is deductible. A HELOC used for other purposes costs more in real terms because you get no tax benefit. Talk to a tax professional about your specific situation, because the rules can be complex and depend on how much you borrowed and what you used it for.

Frequently Asked Questions

Can I have both a mortgage and a HELOC at the same time?

Yes. A HELOC is a second lien on your home, sitting behind your mortgage. You can have both, and many homeowners do. The HELOC lender knows they are second in line — if you foreclose, the mortgage lender gets paid first. This is why HELOC rates are usually higher than mortgage rates.

What if my home value drops — does that affect my HELOC?

Yes. Your HELOC credit limit is based on your home equity, which depends on the home's current value. If the value drops, your available credit may shrink. Some lenders also have clauses that let them freeze or reduce your line if your home value falls or your credit score drops significantly.

Can I convert a HELOC to a mortgage?

Not directly, but you can refinance your mortgage to a larger amount and use the extra cash to pay off the HELOC. This is called a cash-out refinance. You would then have one larger mortgage instead of a mortgage plus a HELOC, which simplifies your payments but extends your repayment timeline.

Is a HELOC easier to get than a mortgage?

No. A HELOC requires you to already own a home with equity, so you cannot get one without first may have access to for and obtaining a mortgage. The underwriting is similar, though the HELOC lender may be less strict because the loan amount is usually smaller and you already have a payment history on your mortgage.

What is the difference in interest rates between a mortgage and a HELOC?

Mortgage rates are typically lower because the mortgage is the first lien on the home. A HELOC rate is usually higher because the lender is second in line if you default. The exact difference varies by lender, market conditions, and your credit, but HELOC rates are commonly 1 to 3 percentage points higher than mortgage rates.