Mortgages and home equity loans are both methods of borrowing that involve you pledging your home as collateral, or backing, for the debt. This means the lender can seize the home eventually if you don't keep up with your repayments. While the two loan types share this important similarity, there are key differences between the two.

Key Takeaways

  • Mortgages and home equity loans are both loans in which you pledge your home as collateral.
  • One key difference between a home equity loan and a traditional mortgage is that you take out a home equity loan after you have ownership (equity) in the property, whereas you take out a mortgage to purchase the property and start building equity in it.
  • Lenders generally allow you to mortgage only as much as 80% of a home's value; the percentage you can borrow via a home equity loan varies, depending on how much of the home you own outright.
  • The total threshold for tax deductions on all residential debt, be it a mortgage or a home equity loan, or both, is currently $750,000.

Mortgages

When people use the term “mortgage,” they are generally talking about a traditional mortgage, in which a financial institution, like a bank or credit union, lends to a borrower money to purchase a residence. In most cases, the bank lends as much as 80% of the home’s appraised value or the purchase price, whichever is less. If, for example, you’re buying a house that's appraised at $200,000, you would be eligible for a mortgage of as much as $160,000; you must come up with the remaining 20%, or $40,000, on your own.

Some mortgages, such as FHA mortgages, allow you to furnish much less than this traditional 20% downpayment, as long as you pay for mortgage insurance.

The interest rate on a mortgage can be fixed (the same throughout the term of the mortgage) or variable (changing every year, for example). The borrower repays the amount of the loan plus interest over a fixed term; the most common terms are 30 or 15 years.

If you get behind on payments, the lender can seize your home in a process known as foreclosure. The lender then sells the home, often at an auction, to recoup its money. Should this happen, this mortgage (known as the "first" mortgage) takes priority over subsequent loans made against the property, such as a home equity loan (sometimes known as a "second" mortgage) or home equity line of credit (HELOC). The original lender must be paid off in full before subsequent lenders receive any proceeds from a foreclosure sale.

Mortgage lending discrimination is illegal. If you think you've been discriminated against based on race, religion, sex, marital status, use of public assistance, national origin, disability, or age, there are steps you can take. One such step is to file a report to the Consumer Financial Protection Bureau or with the U.S. Department of Housing and Urban Development (HUD).

Home Equity Loans

A home equity loan is also a mortgage. The main difference between a home equity loan and a traditional mortgage is that you take out a home equity loan after you have bought and accumulated equity in the property, but you get a mortgage to be able to purchase (finance) the property in the first place—then you start accumulating equity in it.

As the name implies, a home equity loan is secured—that is, guaranteed—by a homeowner's equity in the property, which is the difference between the property’s value and the existing mortgage balance. If you owe $150,000 on a home valued at $250,000, for example, you have $100,000 in equity. Assuming your credit is good, and you otherwise qualify, you can take out an additional loan using that $100,000 as collateral.

Like a traditional mortgage, a home equity loan is an installment loan repaid over a fixed term. Different lenders have different standards as to what percentage of a home’s equity they are willing to lend, and the borrower’s credit rating helps to inform this decision.

Loan-to-Value (LTV) Ratio

Your loan-to-value (LTV) ratio is used by lenders to figure out how much money you can borrow. Here's how you compute an LTV ratio: Add the amount you want to borrow to the amount you still owe on your house and divide that figure by the appraised value of the house; the total is your LTV ratio. If you are in the position of having paid down a good deal of your mortgage—or if your home’s value has risen significantly—then you could get a sizable loan.

Second Mortgages

In many cases, a home equity loan is considered a second mortgage—for example, if the borrower has an existing mortgage on the residence already. If the home goes into foreclosure, the lender holding the home equity loan does not get paid until the first mortgage lender is paid. Consequently, the home equity loan lender’s risk is greater, which is why these loans typically carry higher interest rates than traditional mortgages.

Not all home equity loans are second mortgages, however. A borrower who owns his property free and clear may decide to take out a loan against his home’s value. In this case, the lender making the home equity loan is considered a first-lien holder. These loans may have higher interest rates but lower closing costs—for example, the transaction might need only just an appraisal.

Tax Deductibility of Mortgages and Home Equity Loans

Ironically, home equity loans and mortgages have gotten closer in one respect— their tax deductibility. The reason: the Tax Cuts and Jobs Act of 2017.

Before the Tax Cuts and Jobs Act, you could deduct only up to $100,000 of the debt on a home equity loan.

Under the act, interest on a mortgage is tax-deductible for mortgages of up to either $1 million (if you took out the loan before December 15, 2017) or $750,000 (if you took it out after that time). This new limit applies to home equity loans as well: $750,000 is now the total threshold for deductions on all residential debt.

However, there's a catch. Homeowners used to be able to deduct the interest on a home equity loan or line of credit no matter how they used the money—be it on home improvements, or to pay off high-interest debt, such as credit card balances or student loans. The act suspended the deduction for interest paid on home equity loans from 2018 through 2025 unless they are used to "buy, build, or substantially improve the taxpayer’s home that secures the loan."

The IRS puts this way:

Under the new law...interest on a home equity loan used to build an addition to an existing home is typically deductible, while interest on the same loan used to pay personal living expenses, such as credit card debts, is not. As under prior law, the loan must be secured by the taxpayer’s main home or second home (known as a qualified residence), not exceed the cost of the home, and meet other requirements. 

The Bottom Line

If you have an extremely low interest rate on your existing mortgage, you probably should leave it alone and use a home equity loan to borrow the additional funds you need. But keep in mind that there are limits on its tax deductibility, which include using the money for the purposes of improving your property.

If mortgage rates have dropped substantially since you took out your existing mortgage—or if you need the money for purposes unrelated to your home—you should consider a full mortgage refinance. If you refinance, you can save on the additional money you borrow, as traditional mortgages carry lower interest rates than home equity loans, and you may be able to secure a lower rate on the balance you already owe.