Home Equity Mortgage Interest Deduction: What You Can Actually Claim

How the Home Equity Mortgage Interest Deduction Works Now

The home equity mortgage interest deduction allows homeowners to deduct interest on certain home equity debt, but the rules tightened significantly under the Tax Cuts and Jobs Act of 2017. Before TCJA, you could deduct interest on up to $100,000 in home equity debt regardless of how you used the proceeds. Now, the deduction is tied to how the loan is secured and what the funds are used for, which means many borrowers who once claimed this deduction no longer can.

The core question for most homeowners is whether a home equity loan or line of credit still qualifies. The answer depends on whether the debt is considered acquisition indebtedness and whether the loan is properly secured by the taxpayer's qualified residence.

What Counts as Qualifying Home Equity Debt

Under current law, you can only deduct home equity interest if the loan meets two tests simultaneously. First, the debt must be secured by your primary residence or second home. Second, the total amount of qualified residence interest you can deduct is limited to interest on acquisition indebtedness up to $750,000 for loans taken after December 15, 2017, or $1 million for older grandfathered loans.

Acquisition Indebtedness vs. Home Equity Debt

Acquisition indebtedness is debt used to buy, build, or substantially improve your home. This is the portion of your mortgage that qualifies for the deduction. Home equity debt that does not meet this definition — such as borrowing against your house to pay off credit cards or fund a vacation — generally loses its deductibility under TCJA rules.

The distinction matters because before 2018, home equity interest was deductible even when the money was not used for home improvements. That is no longer true unless the loan is secured and the proceeds are used for qualifying purposes.

The Rules for Home Equity Lines of Credit

A home equity line of credit, or HELOC, is treated similarly to a home equity loan. Interest on a HELOC is deductible only if the borrowed funds are used to buy, build, or substantially improve the property that secures the loan. If you use a HELOC to consolidate debt, pay medical bills, or invest in the stock market, the interest is not deductible.

However, if you use a HELOC to install a new roof, renovate a kitchen, or add an addition, the interest on that portion of the balance qualifies for the deduction, provided the total acquisition indebtedness remains within the $750,000 limit.

Tracking HELOC Use Matters

The IRS requires taxpayers to trace the use of home equity proceeds. A simple record-keeping practice — keeping receipts and loan documents that show where the money went — can make the difference between a fully deductible interest expense and a disallowed one. Without documentation, a taxpayer risks losing the deduction during an audit.

Special Cases: Investment Properties and Second Homes

The home equity mortgage interest deduction also applies to second homes, but with tighter constraints. You can deduct mortgage interest on a second home only if the total acquisition indebtedness across all properties stays within the $750,000 cap. If you have a first mortgage of $500,000 and a home equity loan on your vacation property of $300,000, only $250,000 of that second home equity debt qualifies for the deduction.

Investment properties that are not used as a primary or second residence do not qualify for the home equity interest deduction. The loan must be secured by a qualified residence, which means rental properties and flip projects are generally excluded.

Itemizing vs. the Standard Deduction

Even if you have qualifying home equity interest, you can only claim the deduction if you itemize your tax return. For many households, the standard deduction has become so large that itemizing no longer provides a tax benefit. In 2024, the standard deduction is $29,200 for married filing jointly and $14,600 for single filers. If your total itemized deductions — including mortgage interest, state and local taxes, and charitable gifts — fall below that threshold, the home equity interest deduction has no practical value.

This is a key reason many homeowners stopped claiming home equity interest after TCJA, even when they technically qualified. The effective value of the deduction depends on whether itemizing makes sense for your overall tax situation.

What Changed Under Recent Legislation

The Tax Cuts and Jobs Act of 2017 suspended miscellaneous itemized deductions and eliminated the home equity interest deduction for non-acquisition debt from 2018 through 2025. The current rules are set to expire after 2025 unless Congress extends or modifies them. Homeowners planning ahead should consider that the deduction could change again, which makes careful record-keeping and tax planning essential.

The suspension also means that taxpayers who took out home equity loans between 2018 and 2025 for personal expenses cannot retroactively claim the deduction once the rules revert, because the law applies to the tax years in which the debt was outstanding.

How to Claim the Deduction on Your Return

To claim the home equity mortgage interest deduction, report the deductible interest on Schedule A of Form 1040. Your lender will send you a Form 1098, Mortgage Interest Statement, which shows the total interest paid and any points you may have deducted. From that form, determine which portion of the interest relates to acquisition indebtedness secured by your qualified residence.

If your home equity loan or HELOC was used for both personal and qualifying home improvement purposes, you must allocate the interest proportionally. Only the portion tied to home improvements counts toward the deduction.

A Simple Allocation Example

• Total home equity loan balance: $50,000
• Amount used for home improvements: $20,000
• Total interest paid for the year: $2,500
• Deductible portion: $1,000 (20,000 ÷ 50,000 × $2,500)

State-Level Differences to Watch

Federal rules set the baseline, but some states still allow broader deductions for home equity interest. A few states have not conformed to TCJA and may still permit the deduction of home equity interest for personal expenses, even when the federal return disallows it. Conversely, states that conform to the federal rules mirror the TCJA restrictions exactly. Taxpayers in high-tax states should check their specific state instructions to see whether the home equity mortgage interest deduction is still available at the state level.

Bottom Line for Homeowners

The home equity mortgage interest deduction remains available, but it is narrower than it was before 2018. The deduction applies only to interest on home equity debt that is secured by your primary or second home and used to buy, build, or substantially improve that property. If your home equity loan or HELOC does not meet those conditions, the interest is not deductible. For many taxpayers, the added complexity of tracking and allocating interest is not worth the tax benefit, especially when the standard deduction is large enough to make itemizing unnecessary.

Before taking out a home equity loan or HELOC with the expectation of a tax deduction, run the numbers with a tax professional. The deduction depends on your loan balance, how you use the proceeds, whether you itemize, and which tax year you are in.