Tax Deductions When You Take Out a Second Mortgage

If you already have a first mortgage and you are thinking about borrowing more money against your home, you might be looking at a second mortgage or a home equity loan. Many homeowners wonder if the interest on that new loan will still be tax deductible. The answer is yes, but only if you use the money for certain things. The rules changed a few years ago, and it is important to know what you can and cannot deduct before you sign the papers.

When you take out a second mortgage, you are essentially borrowing against the value of your home that has built up since you bought it. The interest you pay on that loan might be deductible on your federal income taxes, just like the interest on your first mortgage. However, the Internal Revenue Service, or IRS, now has tight limits. For most people, the total amount of mortgage debt you can use for the deduction is capped at $750,000 if you are married filing jointly, or $375,000 if you are single. That includes your first mortgage and your second mortgage combined. If your total mortgage debt is more than those numbers, you can only deduct the interest on the first part up to the limit.

The bigger change came with the Tax Cuts and Jobs Act of 2017. Before that law, you could deduct interest on a home equity loan no matter what you used the money for, up to $100,000. You could pay off credit cards, buy a car, or take a vacation, and the interest was deductible. Not anymore. For tax years 2018 through 2025, the interest on a second mortgage or home equity loan is only deductible if you use the money to buy, build, or substantially improve the home that secures the loan. That means the loan proceeds must go into your house. If you remodel your kitchen, add a new bedroom, install a new roof, or put in a deck, that counts. If you use the cash to pay off student loans or take a trip to Europe, the interest is not deductible.

This rule applies whether you call it a home equity loan, a home equity line of credit, or a second mortgage. The key is what you do with the money. You need to keep good records. If you borrow $50,000 and use $30,000 to add a bathroom and $20,000 to pay down credit card debt, only the interest on the $30,000 part is deductible. The IRS expects you to be able to show how much of the loan went toward home improvement and how much went to other expenses. So save receipts, contracts, and bank statements.

Another point to remember is that the deduction is itemized. That means you cannot take the standard deduction and also deduct your mortgage interest. Most homeowners now take the standard deduction because it went up in recent years. If your total itemized deductions, including mortgage interest, property taxes, and charitable donations, are less than the standard deduction, you will not get any tax benefit from your mortgage interest anyway. It is worth doing a rough calculation before you assume you will save money on taxes with a second mortgage.

If you are using the second mortgage money for improvements, you also need to think about whether those improvements increase your home’s value. For the interest to be deductible, the work must be a substantial improvement that adds to the home’s value, prolongs its useful life, or adapts it to new uses. Routine repairs like painting a room or fixing a leaky faucet do not qualify. The IRS is strict about this. If you are planning a major renovation, the interest on the loan used to pay for it is deductible, as long as you stay within the overall debt limit.

What about a cash-out refinance? That is a different product. When you refinance your first mortgage for more than you owe and take the extra cash, that new mortgage is considered acquisition debt for the part that pays off your old loan. The cash you pull out might be deductible as home equity interest, but again only if you use it for home improvements. The same rules apply.

One last thing. Some homeowners think they can deduct the points on a second mortgage or home equity loan. Points are fees you pay to get a lower interest rate. For a first mortgage, points are usually deductible in the year you pay them. For a second mortgage, it depends. If the loan is used for home improvements, you can deduct the points over the life of the loan, not all at once. If the loan is for other purposes, you cannot deduct the points at all.

The bottom line is that a second mortgage can still give you a tax break, but only if you use the money to fix up your house and you still have enough total itemized deductions to make it worthwhile. Talk to a tax professional about your specific situation. Every homeowner’s numbers are different, and the rules can be tricky. But knowing these basics will help you make a smarter decision when you are shopping for a second mortgage.