The rules got a permanence upgrade recently. The One Big Beautiful Bill Act (OBBBA), signed into law in July 2025, locked in the TCJA-era home equity interest rules instead of letting them expire in 2026 as originally scheduled. That's good news for anyone trying to plan ahead.
This guide walks through the eligibility rules, deduction limits, itemizing math, and the records you'll need to keep.
Key Takeaways
- HELOC interest is deductible only when funds buy, build, or substantially improve the home securing the loan
- The combined mortgage and HELOC debt limit is $750,000 ($375,000 if married filing separately), now permanent under OBBBA
- Claiming this deduction requires itemizing on Schedule A instead of taking the standard deduction
- Mixed-use HELOCs need careful tracking; only the improvement-related interest qualifies
What Makes HELOC Interest Tax-Deductible
The IRS applies a simple test: did you use the money to buy, build, or substantially improve the home that secures the HELOC? IRS Publication 936 (2025) spells this out clearly for tax years after 2017.
A substantial improvement is one that adds value to the home, extends its useful life, or adapts it to new uses. Repainting a bedroom doesn't count. Neither does fixing a leaky faucet. These are routine repairs, not improvements, and the IRS treats them that way.
The improvement also has to be on the same home securing the debt. Use a HELOC on your primary residence to renovate a rental property, and that interest won't qualify.
Publication 936's own example makes the split concrete:
- $180,000 used for substantial improvements → classified as home-acquisition debt (deductible)
- $20,000 used to buy a car → classified as home-equity debt (not deductible)
Same Loan, Different Outcomes
Two homeowners each draw $50,000 on a HELOC:
- Homeowner A uses the full $50,000 on a kitchen remodel. The interest qualifies for the deduction.
- Homeowner B uses the $50,000 to pay off credit card balances. None of that interest is deductible, even though it's the exact same loan product secured the exact same way.
Same HELOC and lender; only how the funds were used decides deductibility.
Vacation homes have their own wrinkle: the IRS specifically notes that using a HELOC secured by your main home to purchase a vacation property does not produce deductible interest, even though you're technically "buying" real estate. (IRS Newsroom)
Before 2018, the Rules Were Looser
Pre-TCJA, homeowners could deduct interest on up to $100,000 of home equity debt ($50,000 if married filing separately) regardless of how they used the funds. Debt consolidation, tuition, a new boat — it didn't matter. That flexibility disappeared with the Tax Cuts and Jobs Act, and later law has locked in the stricter buy/build/improve standard permanently.
How Much HELOC Interest Can You Deduct
Even when your HELOC use qualifies, there's a ceiling on how much total debt the deduction applies to.
For loans taken out after December 15, 2017:
- $750,000 combined limit (single or married filing jointly)
- $375,000 if married filing separately
For mortgages originated before December 16, 2017 (grandfathered):
- $1,000,000 combined limit
- $500,000 if married filing separately
This is a combined limit. Your primary mortgage and your HELOC get added together, not evaluated separately.
Worked Example
Say you have a $675,000 mortgage balance plus a $100,000 HELOC used entirely for a qualifying home addition. That's $775,000 in combined debt against a $750,000 cap.
- You're $25,000 over the limit
- Only interest on $750,000 of that combined debt is deductible
- Interest on the excess $25,000 of debt gets prorated out of your deduction
IRS Publication 936 walks through this proration using its Table 1 worksheet, dividing interest between qualifying and non-qualifying amounts.
Will these limits still apply in 2026? Yes. OBBBA Section 70108 removed the January 1, 2026 sunset that was originally written into the Tax Cuts and Jobs Act (TCJA). The $750,000/$375,000 limits now apply indefinitely, not just through 2025.
Itemizing vs. Standard Deduction: Is It Worth It?
Here's the part many homeowners miss: qualifying HELOC use isn't enough on its own. You must itemize on Schedule A to claim any of this. If you take the standard deduction, the HELOC interest deduction does nothing for you, no matter how the funds were spent.
That means you need your itemized total to exceed the standard deduction for your filing status.
| Filing Status | 2025 Standard Deduction | 2026 Standard Deduction |
|---|---|---|
| Single | $15,750 | $16,100 |
| Married Filing Jointly | $31,500 | $32,200 |
| Head of Household | $23,625 | $24,150 |
To clear that bar, HELOC interest typically needs to stack with other itemizable expenses:
- Property taxes
- State and local income or sales taxes (subject to the SALT cap)
- Charitable contributions
- Qualifying medical expenses above the AGI threshold
If your combined itemized total lands below your standard deduction, itemizing simply isn't worth the paperwork. This is the kind of calculation a tax advisor should run before you file.
If you're still weighing whether a HELOC fits your plans, ClearPoint Mortgage Advisors can walk you through how home equity financing works alongside that tax decision.
Eligible vs. Ineligible HELOC Uses
Not every home-related expense clears the "substantial improvement" bar. Here's how it typically breaks down.
Likely to qualify:
- Room additions or home extensions
- Major kitchen or bathroom remodels
- Roof replacement
- New HVAC system installation
- Finishing an unfinished basement
Won't qualify:
- Debt consolidation
- Tuition payments
- Medical bills
- Vacations
- Minor repairs or cosmetic touch-ups (repainting, small patch jobs)
The gray zone is mixed-use HELOCs, where you draw on the same line for both a bathroom remodel and, say, a credit card payoff. In that scenario, only the portion tied to the improvement is deductible. The IRS doesn't let you round up.
ClearPoint Mortgage Advisors' HELOC products are structured as general-purpose credit lines: funds can go toward debt consolidation, investments, or home improvements alike. That flexibility is useful for financing, but it puts the tracking burden on you at tax time. Nobody separates the draws for you automatically.
Keeping Records & Working With a Tax Advisor
Good documentation is what turns "I think this qualifies" into a deduction that survives scrutiny.
What to hold onto:
- Form 1098 from your lender (issued if you paid $600 or more in mortgage interest during the year)
- Contractor invoices and itemized receipts
- Permits pulled for the improvement work
- Bank statements showing how each draw was spent
If your deductible interest exceeds what's shown on Form 1098, Publication 936 still allows the extra amount. Report it on Schedule A, line 8b, and attach a short statement explaining the difference.
The simplest habit to build: keep home-improvement HELOC draws separate from other spending. If the same line covers a kitchen remodel and a personal expense, open a dedicated draw or sub-account when your lender allows it.
Mixing those uses forces you to reconstruct spending later—harder and riskier than tracking it upfront.
With those records in hand, ask your tax preparer before you file:
- Does itemizing actually beat my standard deduction this year?
- What records do you need from me for the HELOC portion?
- Does any of my HELOC debt exceed the $750,000 combined cap?
If you're weighing a HELOC for an upcoming renovation, talk with a mortgage advisor at ClearPoint Mortgage Advisors about loan terms and equity access. Then confirm with a tax advisor how the interest deduction fits your specific return.
Frequently Asked Questions
Is home equity line of credit (HELOC) interest tax deductible?
Yes, but only when the funds are used to buy, build, or substantially improve the home securing the loan. Interest on HELOC funds used for other purposes, like debt consolidation, doesn't qualify.
Can I deduct HELOC interest if I don't itemize my deductions?
No. You must itemize on Schedule A to claim this deduction. If your standard deduction is higher than your itemized total, there's no tax benefit to itemizing.
Will HELOC interest be tax-deductible in 2026?
Yes. OBBBA made the buy/build/improve rule and the $750,000 combined debt limit permanent, removing the sunset that was originally set for 2026.
Is HELOC interest 100% tax deductible?
Not necessarily. Only interest on qualifying improvement-related debt, up to the $750,000 combined cap, is deductible. The full interest amount is not deductible regardless of use or loan size.
What happens if I use my HELOC for both home improvements and other expenses?
Only the interest tied to the qualifying improvement portion is deductible. You'll need to track your draws carefully to separate improvement spending from everything else.
