Quick Answer
HELOC interest is tax deductible only when you use the funds to buy, build, or substantially improve your home. Since 2018, interest on HELOCs used for other purposes (debt consolidation, cars, vacations) is no longer deductible. The combined mortgage and HELOC debt limit is $750,000 for married filing jointly.
Best Answer
Robert Kim, Tax Return Analyst
Best for homeowners considering using HELOC funds for home improvements or major renovations
When HELOC interest is deductible under current law
HELOC interest is tax deductible when you use the borrowed funds to "buy, build, or substantially improve" the home that secures the loan. This is the key test under the Tax Cuts and Jobs Act of 2017, which eliminated the previous blanket deduction for home equity interest.
The funds must be used for qualified home improvements, such as:
Example: $50,000 HELOC for kitchen renovation
Say you take a $50,000 HELOC at 7.5% interest to renovate your kitchen. Your annual interest is $3,750. Because you used the funds for home improvement, this $3,750 is fully deductible as mortgage interest (assuming you itemize and stay under the debt limit).
If you're in the 24% tax bracket, this deduction saves you $900 in federal taxes ($3,750 × 0.24). Add state tax savings, and your effective interest rate drops significantly.
The $750,000 debt limit
Your total mortgage debt (first mortgage + HELOC) cannot exceed $750,000 for married filing jointly ($375,000 for married filing separately) to claim the full deduction.
What's NOT deductible anymore
Since 2018, HELOC interest is NOT deductible when used for:
Documentation requirements
To claim HELOC interest as a deduction, you must:
The IRS may ask you to prove the funds were used for qualified home improvements, especially during an audit.
Mixed-use situations
If you use HELOC funds for both qualified improvements and other expenses, only the portion used for home improvements generates deductible interest.
Example: You take a $60,000 HELOC. You spend $40,000 on a bathroom renovation and $20,000 to pay off credit cards. Only 67% of your HELOC interest ($40,000 ÷ $60,000) is deductible.
What you should do
Before taking a HELOC, plan your use of funds carefully. If you need money for both home improvements and other expenses, consider timing: use the HELOC for qualified improvements first, then explore other financing for non-deductible purposes.
Use our return scanner to check if you've been claiming HELOC interest correctly on past returns. Many taxpayers miss this deduction when they qualify, or claim it when they don't.
Key takeaway: HELOC interest remains deductible when used for home improvements, but the Tax Cuts and Jobs Act eliminated deductions for other uses. The combined mortgage debt limit is $750,000 for joint filers.
Key Takeaway: HELOC interest is deductible only when funds are used for home improvements, with a $750,000 combined debt limit for joint filers.
HELOC interest deductibility by use of funds under current tax law
| Use of HELOC Funds | Deductible? | Tax Form | Notes |
|---|---|---|---|
| Home renovations/improvements | Yes | Schedule A | Must improve home securing the loan |
| Debt consolidation | No | N/A | Eliminated by Tax Cuts and Jobs Act |
| Car purchase | No | N/A | No longer deductible |
| Investment property down payment | No | N/A | Different property than securing loan |
| Business equipment (home office) | Partial | Schedule C + A | Requires allocation between business/personal |
More Perspectives
Robert Kim, Tax Return Analyst
Best for new homeowners trying to understand HELOC rules and plan future home improvement financing
Understanding HELOC deductions as a new homeowner
As a first-time homebuyer, you might be wondering about using a HELOC for future improvements. The key rule is simple: HELOC interest is only deductible when you use the money to improve the home that secures the loan.
This means deductible uses include:
Non-deductible uses include:
Planning your home improvement strategy
If you're considering a HELOC for future projects, document everything. Keep receipts, contracts, and photos of the work. The IRS requires proof that HELOC funds went toward qualified home improvements.
Smart approach: Create a separate account for HELOC funds and only use it for home improvements. This creates a clear paper trail.
Debt limits for new homeowners
Your combined mortgage and HELOC debt cannot exceed $750,000 (joint filers) to claim the full interest deduction. For most first-time buyers, this limit isn't a concern, but it's important to understand for future planning.
Remember: you must itemize deductions to claim HELOC interest. With the higher standard deduction ($30,000 for joint filers in 2026), many homeowners don't itemize unless they have substantial mortgage interest, state taxes, and other deductions.
Key takeaway: Plan HELOC use carefully from the start—only home improvement expenses generate deductible interest under current law.
Key Takeaway: Plan HELOC use carefully from the start—only home improvement expenses generate deductible interest under current law.
Robert Kim, Tax Return Analyst
Best for homeowners who work from home and are considering home office improvements funded by a HELOC
HELOC interest and home office improvements
If you're using HELOC funds to improve your home office space, the interest deductibility depends on whether the improvement benefits the entire home or just your office area.
Fully deductible home office improvements:
Partially deductible improvements:
The allocation challenge
When HELOC-funded improvements benefit both personal and business use, you must allocate the interest deduction. If your home office is 200 sq ft in a 2,000 sq ft home (10%), then 10% of improvements might qualify for business deduction treatment, while 90% qualifies as home improvement interest.
Example: You spend $30,000 from a HELOC to finish your basement, creating a 300 sq ft home office in a 2,000 sq ft home. The office represents 15% of your home. You might treat 15% of the HELOC interest as a business expense (Schedule C) and 85% as mortgage interest (Schedule A).
Documentation is critical
For home office HELOC improvements, maintain detailed records:
Consult a tax professional for complex home office situations involving HELOC funding, as the interaction between mortgage interest deductions and business expense deductions can be tricky.
Key takeaway: Home office improvements funded by HELOC may qualify for both mortgage interest and business expense deductions, but proper allocation and documentation are essential.
Key Takeaway: Home office improvements funded by HELOC may qualify for both mortgage interest and business expense deductions, but proper allocation and documentation are essential.
Sources
- IRS Publication 936 — Home Mortgage Interest Deduction
- Tax Cuts and Jobs Act of 2017 — Legislation that changed HELOC deduction rules
Related Questions
Reviewed by Robert Kim, Tax Return Analyst on February 28, 2026
This content is for educational purposes only and is not a substitute for professional tax advice. Consult a qualified tax professional for advice specific to your situation.