The Short Answer: Interest May Be Deductible, but Only Under Specific Conditions

Interest on a home equity line of credit (HELOC) is sometimes tax-deductible, but not always. The IRS allows you to deduct HELOC interest only if you use the borrowed money to buy, build, or substantially improve your home. If you use the money for other purposes — paying off credit cards, funding a business, paying medical bills, or any other reason — the interest is not deductible.

This rule comes from the Tax Cuts and Jobs Act of 2017, which tightened what counts as deductible mortgage interest. Before that law, you could deduct interest on a HELOC for almost any purpose. Now the line is clear: the money has to go toward your home itself.

Key Takeaways

  • HELOC interest is deductible only when the borrowed funds are used to buy, build, or improve your home — not for other expenses.
  • You must itemize deductions on your tax return to claim mortgage interest; the standard deduction may be larger for your situation.
  • The total mortgage debt you can deduct interest on is capped at $750,000 (or $375,000 if married filing separately), which includes your primary mortgage and HELOC combined.
  • Keeping records of how you spent the HELOC money is essential if the IRS ever questions your deduction.

How the IRS Decides What Qualifies

The IRS looks at what you actually did with the money, not what you intended to do. If you borrowed $50,000 on a HELOC and deposited it into your checking account, then used that account to pay your credit card bill, the IRS will say the money went toward credit card debt, not home improvement.

To stay on the safe side, many people keep the HELOC money separate from other accounts until it is spent on the home. If you borrowed $30,000 to renovate your kitchen, keep that $30,000 in its own account and pay the contractor directly from that account. This creates a clear paper trail showing the money went to the home improvement.

What counts as "substantially improve"? The IRS means work that adds value to your home, prolongs its life, or adapts it to a new use. A new roof, a finished basement, a deck, or a kitchen remodel all count. Routine repairs and maintenance do not — replacing a broken window or fixing a leaky faucet does not may have access to, even though you need to do it.

The Debt Limit That Affects Your Deduction

Even if you use HELOC money for home improvement, you can only deduct interest on up to $750,000 of total mortgage debt. This limit applies to the combined balance of your primary mortgage, second mortgage, and HELOC — all added together.

For example: you have a $400,000 primary mortgage and a $200,000 HELOC, both used for home-related purposes. Your total is $600,000, which is under the $750,000 cap, so all the interest is deductible. But if your primary mortgage is $600,000 and your HELOC is $200,000, your total is $800,000. The IRS will only let you deduct interest on $750,000 of that debt, so some of your HELOC interest becomes non-deductible.

If you are married and file separately, the cap drops to $375,000 per person. This rule rarely helps, so most couples file jointly.

Itemizing Versus the Standard Deduction

Even if your HELOC interest is deductible, you only benefit if you itemize deductions on your tax return. Most people take the standard deduction instead, which is a flat amount the IRS lets you subtract from your income without listing individual deductions.

For 2024, the standard deduction is $14,600 for single filers and $29,200 for married couples filing jointly. If your mortgage interest, property taxes, charitable donations, and other itemized deductions add up to less than that, you are better off taking the standard deduction. The deductible HELOC interest does you no good.

You will need to run the numbers both ways — add up all your itemized deductions and compare to the standard deduction for your filing status. If itemizing wins, then your deductible HELOC interest reduces your taxable income. If the standard deduction is larger, the HELOC interest does not help you on your taxes.

What Happens If You Use the Money for Multiple Purposes

Sometimes people borrow on a HELOC and use part of it for home improvement and part for something else. The IRS treats each dollar separately. If you borrowed $100,000 and spent $60,000 on a kitchen remodel and $40,000 to pay off credit cards, only 60 percent of the interest is deductible.

This is why documentation matters. Keep receipts and invoices from contractors, suppliers, and lenders. Keep bank statements showing where the money went. If you paid yourself back for home improvement costs you covered out of pocket, keep records of that too. The IRS can ask for proof, and having it protects you.

State Tax Rules May Differ

Some states allow you to deduct mortgage interest on your state tax return, and some do not. A few states have their own caps or rules that differ from the federal limit. You may be able to deduct HELOC interest on your federal return but not on your state return, or vice versa.

Check your state's tax agency website or speak with a tax preparer who knows your state's rules. This is especially important if you live in a high-tax state where mortgage interest deductions can make a real difference.

Frequently Asked Questions

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

No. The IRS only allows the deduction if the money went toward buying, building, or improving your home. Paying off credit cards, student loans, or other debts does not may have access to, even if you used a HELOC to do it. The interest on that HELOC becomes non-deductible.

What if I borrowed for home improvement but the project is not finished yet?

You can deduct the interest as long as the money was spent on the home improvement, even if the work is still ongoing. Once the project is complete, you continue to deduct interest on the HELOC as long as the debt remains and you have not used the line for other purposes.

Do I need to report the HELOC on my tax return even if I do not deduct the interest?

No. You only report mortgage interest you are deducting. If the interest is not deductible, you do not need to mention the HELOC on your return. However, keep your own records in case the IRS asks how you used the borrowed money.

If my HELOC interest is not deductible, can I deduct the principal I pay back?

No. Principal payments on any loan are never deductible. Only the interest portion may be deductible, and only if the borrowed money went toward home-related purposes.

What if I refinanced my HELOC into a home equity loan?

The deductibility does not change. If the original HELOC money was used for home improvement, the interest on the new loan remains deductible as long as the total mortgage debt stays under the $750,000 cap. The form of the loan does not matter — only what the money was used for.