HELOC interest is tax-deductible only if you use the borrowed money to buy, build, or improve a home that secures the loan

The IRS allows you to deduct interest on a home equity line of credit, but only under specific conditions. The money must go toward the home itself — a renovation, addition, or repair. If you borrow against your home's equity and use that money for anything else — a car, credit card payoff, medical bills, or a vacation — the interest is not deductible, even though the loan is secured by your house.

This rule comes from Section 163(h)(3) of the tax code. The IRS distinguishes between the loan's source (your home equity) and the loan's purpose (what you actually spend it on). Purpose is what matters for the deduction.

Key Takeaways

  • HELOC interest is deductible only when the borrowed funds are used for home acquisition, construction, or substantial improvement of the property that secures the line of credit.
  • Using HELOC money for personal expenses, debt consolidation, or anything unrelated to the home makes that interest non-deductible, regardless of the loan being home-secured.
  • You must itemize deductions on your tax return to claim HELOC interest; the standard deduction does not include mortgage or HELOC interest.
  • Total deductible mortgage and HELOC debt combined cannot exceed $750,000 (or $375,000 if married filing separately) for loans taken out after December 15, 2017.
  • Keeping records of how you spent the HELOC funds is essential if the IRS questions your deduction.

What counts as a deductible use of HELOC funds

The IRS considers these uses deductible: adding a bedroom or bathroom, replacing a roof, installing new windows, finishing a basement, building a deck, upgrading plumbing or electrical systems, or replacing major appliances that are permanently attached to the home. The improvement must add value to the home or prolong its useful life.

Repairs that simply restore the home to its original condition — fixing a leak, patching drywall, repainting — are generally not considered improvements and do not make the HELOC interest deductible. The line between repair and improvement can be gray, and the IRS has specific guidance on this. When in doubt, a tax professional can advise whether your particular project qualifies.

If you use part of the HELOC for a deductible purpose and part for a non-deductible purpose, you can only deduct the interest on the portion used for home improvement. This requires clear documentation of how much went where.

Non-deductible uses that disqualify the interest

If you draw from your HELOC to pay off credit card debt, student loans, or a car loan, that interest is not deductible. The same applies if you use the funds for living expenses, medical bills, education costs, or investment purposes. Many homeowners use HELOCs for debt consolidation precisely because the interest rate is lower than credit cards, but this strategy does not create a tax deduction.

A common scenario: you borrow $50,000 against your home equity, use $30,000 to add a room and $20,000 to pay off a car loan. You can deduct interest only on the $30,000 portion. The lender will not separate these for you — you must track it yourself and report it correctly on your return.

Itemizing deductions versus the standard deduction

Even if your HELOC use qualifies, you only benefit from the deduction if you itemize deductions on your tax return. Most taxpayers claim the standard deduction, which for 2024 is $14,600 for single filers and $29,200 for married couples filing jointly. The standard deduction does not include any mortgage or HELOC interest.

To claim HELOC interest, you must file Schedule A and itemize. This means adding up all deductible expenses — mortgage interest, property taxes, charitable donations, medical expenses above a threshold, and state and local taxes (capped at $10,000). Only if your total itemized deductions exceed the standard deduction does itemizing make financial sense.

Many homeowners find that even with HELOC interest, their total itemized deductions do not exceed the standard deduction, especially after the $10,000 cap on state and local taxes. A tax preparer can run both scenarios to show which approach saves more.

The $750,000 debt limit for deductible interest

The Tax Cuts and Jobs Act of 2017 placed a cap on deductible mortgage and HELOC debt. For loans taken out after December 15, 2017, you can only deduct interest on up to $750,000 of combined mortgage and home equity debt (or $375,000 if married filing separately). Loans taken out before that date fall under the old $1 million limit.

This means if you have a $600,000 mortgage and a $200,000 HELOC, your total deductible debt is $750,000, so all interest is deductible. But if you have a $700,000 mortgage and a $100,000 HELOC, only $50,000 of the HELOC interest is deductible because the combined debt exceeds the cap.

The limit applies to the principal balance of the debt, not the interest paid. If you pay down your mortgage, you free up room under the cap to deduct more HELOC interest.

Documentation and record-keeping for the IRS

If you claim HELOC interest as a deduction, keep records showing how you used the funds. This might include contractor invoices, receipts, bank statements showing the transfer to a home improvement account, or cancelled checks to suppliers. The IRS can request this documentation if your return is audited.

For a HELOC used partly for deductible and partly for non-deductible purposes, document the allocation clearly. If you transferred $50,000 from the HELOC to a home renovation account and $20,000 to a personal checking account, that split should be visible in your bank records.

Keep these records for at least three years after filing the return, though the IRS can go back further in some cases. A simple spreadsheet tracking each HELOC withdrawal and its purpose is often enough, as long as it matches your bank statements.

State tax treatment of HELOC interest

Some states follow federal rules exactly; others have different rules or do not allow HELOC interest deductions at all. A few states have no income tax, so the question does not apply. Before claiming the deduction on your state return, check your state's tax authority website or ask a tax professional about your state's specific rules.

California, for example, generally follows federal rules but has its own income tax brackets and caps. New York allows the deduction but applies its own limits. If you live in a state with income tax, do not assume your federal deduction automatically carries over to your state return.

Frequently Asked Questions

Can I deduct HELOC interest if I used the money to pay off other debts?

No. Debt consolidation does not make HELOC interest deductible. The IRS looks at what you spent the money on, not where the money came from. If you borrowed against your home to pay off credit cards or a car loan, that interest is not deductible, even though the HELOC itself is secured by your house.

What if I used my HELOC for both a home improvement and personal expenses?

You can deduct interest only on the portion used for the home improvement. You must document how much went to each purpose using bank records or a written allocation. If you cannot clearly separate the uses, the IRS may disallow the entire deduction.

Do I have to itemize to deduct HELOC interest?

Yes. HELOC interest only appears on Schedule A, which you file when itemizing deductions. If your total itemized deductions do not exceed the standard deduction for your filing status, you will not benefit from claiming the HELOC interest deduction.

What is the difference between a HELOC and a home equity loan for tax purposes?

For tax deduction purposes, there is no difference. Both are secured by your home, and both allow you to deduct interest only if the borrowed funds are used for home acquisition, construction, or improvement. The deduction depends on how you spend the money, not the type of loan.

If I took out my HELOC before 2018, do I get a higher debt limit?

Yes. HELOCs and mortgages taken out before December 16, 2017, fall under the old $1 million limit instead of the new $750,000 limit. If your combined mortgage and HELOC debt is between $750,000 and $1 million, you can deduct interest on the full amount only if both loans predate the cutoff.