How a HELOC can pay down or replace your mortgage

A HELOC (home equity line of credit) lets you borrow against the equity you have built in your home, then use that money to pay off your mortgage balance in full or in part. The process is straightforward: you open the HELOC, draw funds during the draw period (usually 5 to 10 years), and use those funds to pay your mortgage lender directly. Your mortgage is then either eliminated or reduced, depending on how much you borrowed.

The appeal is that a HELOC typically carries a lower interest rate than credit cards or personal loans, because it is secured by your home. However, using a HELOC this way also means you are replacing one debt secured by your home with another, so the risk to your home remains — you still owe money against it, and if you cannot pay, foreclosure is still possible.

Whether this strategy makes financial sense depends on the interest rate of your current mortgage, the rate the HELOC offers, how much equity you have, and your ability to repay both the HELOC and any remaining mortgage balance on time.

Key Takeaways

  • A HELOC draws on your home equity and typically offers a lower interest rate than unsecured debt, but it is still secured by your home.
  • You can use HELOC funds to pay off your entire mortgage or a portion of it, but you will then owe the HELOC balance instead.
  • HELOC interest rates are usually variable, meaning your monthly payment can increase if rates rise during the draw or repayment period.
  • Using a HELOC to pay off a mortgage makes the most sense when the HELOC rate is significantly lower than your mortgage rate and you can afford the payments.
  • Some people use a HELOC as a bridge to pay off a mortgage faster by making larger payments during the draw period, then repaying the HELOC over time.

The mechanics of paying off a mortgage with HELOC funds

When you open a HELOC, the lender sets a credit limit based on your home's value minus what you still owe on your mortgage. For example, if your home is worth $400,000 and you owe $250,000 on your mortgage, you may be able to borrow up to $150,000 through a HELOC (the exact amount depends on the lender's policies and your credit).

During the draw period, you can withdraw money as you need it, similar to a credit card. You write a check, use a debit card, or request a transfer to your bank account. Once you have the funds, you send a payment to your mortgage lender to pay down or pay off the mortgage balance. Your mortgage lender receives the payment and reduces your mortgage balance accordingly.

After the draw period ends, the HELOC moves into the repayment phase, during which you can no longer borrow new money but must repay what you have already borrowed. The repayment period typically lasts 10 to 20 years, depending on your lender's terms.

Interest rates and how they affect your total cost

Most HELOCs have variable interest rates, meaning the rate can change over time based on market conditions and the lender's prime rate. Your rate is usually tied to the prime rate plus a margin set by the lender. If the prime rate goes up, your HELOC rate goes up, and your monthly payment increases.

Your mortgage, by contrast, likely has a fixed rate — the same rate for the entire loan term. If you replace a 4% fixed mortgage with a HELOC at 7% variable, you may save money initially if rates stay low, but you face the risk that rates will rise and your payment will increase. Some HELOCs offer a fixed-rate option for part or all of the borrowed amount, which locks in a rate but usually at a higher cost than the variable rate.

To compare the true cost, calculate your total interest paid over the life of both loans. A HELOC at a lower rate may save you money overall, but only if rates do not rise significantly and you repay it within a reasonable timeframe. The longer you carry the HELOC balance, the more interest you pay.

Scenarios where a HELOC payoff strategy makes sense

Using a HELOC to pay off a mortgage works best when your mortgage rate is substantially higher than the HELOC rate you are offered. For example, if you have a 6% mortgage and a HELOC is available at 5%, the rate difference alone may justify the switch — assuming rates stay stable or you lock in a fixed rate.

Another scenario is when you want to pay off your mortgage faster. Some homeowners use a HELOC during the draw period to make large lump-sum payments toward their mortgage, shortening the loan term and reducing total interest paid. They then repay the HELOC over the repayment period. This works only if you have steady income and can afford both the HELOC payments and any remaining mortgage payments.

A HELOC can also provide flexibility if you need access to cash for other purposes while paying down your mortgage. During the draw period, you can borrow for emergencies, home repairs, or other needs without taking out a separate loan. However, this flexibility can also be a trap — borrowing against your home for non-essential expenses increases your debt and extends the time it takes to become debt-free.

Risks and drawbacks of using a HELOC for mortgage payoff

The primary risk is that your home remains collateral for debt. With a traditional mortgage, you are borrowing against your home to buy it. With a HELOC used to pay off a mortgage, you are still borrowing against your home, just in a different form. If you cannot make payments, the lender can foreclose.

Variable interest rates pose another risk. If rates rise significantly during the draw or repayment period, your monthly payment can increase substantially, making the loan unaffordable. A 2% rate increase on a $200,000 HELOC balance means an extra $4,000 per year in interest alone.

HELOCs also have time limits. Once the draw period ends, you cannot borrow more money, and you must begin repaying what you have borrowed. If you have not paid down the balance significantly, you may face a large balloon payment or a sudden jump in your monthly payment when the repayment period begins. Some lenders require you to repay the entire balance at the end of the repayment period, which can be a financial shock if you have not planned for it.

Additionally, using a HELOC to pay off a mortgage resets the clock on your debt. If you have 10 years left on your mortgage, you may be replacing it with a 15 or 20-year HELOC repayment period, meaning you will be in debt longer overall.

Comparing a HELOC payoff to other mortgage strategies

Refinancing your mortgage is an alternative to using a HELOC. If rates have dropped, you can refinance your existing mortgage into a new loan at a lower rate, reducing your monthly payment or shortening your loan term. Refinancing does not require you to borrow against your home equity; instead, you replace your existing mortgage with a new one. The downside is that refinancing involves closing costs and a new process process, and you must may have access to based on your current credit and income.

Making extra payments toward your existing mortgage is another option that requires no new borrowing. If you have extra cash, you can send it directly to your mortgage lender to pay down the principal faster. This reduces the total interest you pay and shortens the loan term, with no new debt or risk.

A cash-out refinance is similar to a HELOC but works differently. You refinance your mortgage for more than you owe, receive the difference in cash, and use that cash to pay off the mortgage balance. The result is a single new mortgage for the full amount. This can be simpler than managing two separate debts (a mortgage and a HELOC), but it also means you are borrowing more money upfront rather than drawing it as needed.

Steps to use a HELOC to pay off a mortgage

First, determine how much equity you have in your home. Subtract what you owe on your mortgage from your home's current market value. Most lenders will let you borrow up to 80% to 85% of your home's value, minus what you owe. For example, if your home is worth $300,000 and you owe $200,000, you may borrow up to $40,000 to $55,000 (depending on the lender's policy).

Next, shop for HELOC offers from multiple lenders — banks, credit unions, and online lenders all offer HELOCs. Compare the interest rate, the length of the draw period, the length of the repayment period, whether the rate is fixed or variable, and any fees (process fees, annual fees, or early closure fees). Ask each lender what the rate would be if you locked in a fixed rate for part or all of the borrowed amount.

Once you have chosen a lender and been approved, you will receive the HELOC credit line. During the draw period, withdraw the amount you need to pay off your mortgage. Contact your mortgage lender to confirm the exact payoff amount (this includes any accrued interest), then send a payment from your HELOC for that amount. Your mortgage lender will send you a final statement confirming the mortgage is paid in full.

After the mortgage is paid off, you will owe only the HELOC balance. Make regular payments during the repayment period to avoid default. If you locked in a fixed rate, your payment will stay the same. If your rate is variable, your payment may change as rates fluctuate.

Frequently Asked Questions

Can I use a HELOC to pay off my mortgage if I still owe a lot?

Yes, as long as you have enough equity. If you owe $250,000 on a $400,000 home, you have $150,000 in equity and may be able to borrow most or all of that through a HELOC. However, if you owe $350,000 on a $400,000 home, you have only $50,000 in equity and can borrow much less. Lenders typically will not lend more than 80% to 85% of your home's value.

What happens if interest rates rise after I open a HELOC?

If your HELOC has a variable rate, your interest rate and monthly payment will increase when the prime rate rises. If you locked in a fixed rate for part or all of the balance, that portion will not change, but any variable-rate portion will. This is why comparing fixed-rate options at the time you open the HELOC is important.

Will paying off my mortgage with a HELOC hurt my credit score?

Opening a HELOC will cause a small, temporary dip in your credit score due to the hard inquiry and new account. However, paying off your mortgage with the HELOC funds may actually help your score over time because you are reducing your overall debt and improving your debt-to-income ratio. The impact depends on your individual credit profile.

What if I cannot afford the HELOC payments when the repayment period starts?

If you cannot make payments, contact your lender when ready to discuss options such as a payment plan or loan modification. If you do not pay, the lender can foreclose on your home. This is why it is important to calculate whether you can afford the HELOC payments before you open one, especially if the rate is variable and could increase.

Is it better to pay off my mortgage or invest the HELOC money instead?

This depends on your personal situation, risk tolerance, and the interest rates involved. Paying off a mortgage eliminates debt and guarantees a return equal to your mortgage rate. Investing the money may generate higher returns but carries market risk. Many people find peace of mind in eliminating mortgage debt, while others prefer to invest and keep the mortgage. Consider speaking with a financial advisor about your specific circumstances.