The quick answer
HELOC interest IS deductible when you use the borrowed funds to buy, build, or substantially improve the home that secures the loan.
HELOC interest is NOT deductible when you use the funds for anything else: debt consolidation, vacations, college tuition, business capital, investment, medical bills, etc.
This rule comes from the 2017 Tax Cuts and Jobs Act and applies to tax years 2018 through 2025 (currently extended through 2026 by IRS guidance, with proposed legislation to make it permanent).
What "substantially improve" actually means
The IRS uses the same definition that applies to capital improvements:
- Adds to the value of the home
- Prolongs the home's useful life
- Adapts the home to new uses
Qualifies (deductible):
- Kitchen renovation
- Bathroom addition or renovation
- New roof, windows, or siding
- Addition (room, second story, ADU)
- HVAC system replacement
- Solar panel installation
- Pool installation
- Major landscaping (driveway, patio, retaining wall)
Does NOT qualify (not deductible):
- Routine repairs (fixing a broken window, painting walls)
- Maintenance (annual servicing, gutter cleaning)
- Furniture and appliances (washer, dryer, refrigerator are personal property)
- Renting equipment for routine maintenance
- Cosmetic-only changes that don't add lasting value
The $750,000 cap
Even when interest is deductible, the total amount of "home acquisition debt" you can deduct interest on is capped at $750,000 ($375,000 married filing separately). This combines your first mortgage plus any HELOC or home equity loan used for acquisition or improvements.
Example: First mortgage of $650K + HELOC of $80K used entirely for kitchen and bathroom renovations = $730K total home acquisition debt. Under the $750K cap. All interest deductible (subject to itemization).
Example 2: First mortgage of $700K + HELOC of $100K used for renovations = $800K total. The first $750K is deductible. The remaining $50K of HELOC is over the cap, so interest on that $50K is not deductible.
For mortgages originated before 12/15/2017, an older $1 million cap may still apply (grandfathered).
Standard deduction vs itemizing
HELOC interest is only useful if you itemize deductions. The 2026 standard deduction:
- Single: $14,600
- Married filing jointly: $29,200
- Head of household: $21,900
To benefit from HELOC interest deduction, your total itemized deductions (mortgage interest, state/local taxes capped at $10K, charitable contributions, etc.) need to exceed your standard deduction.
For most middle-class taxpayers since 2018, the higher standard deduction means itemizing makes sense only with substantial mortgage interest, large charitable giving, or high state/local taxes (capped at $10K).
Mixed-use HELOC funds
What if you use part of your HELOC for home improvements and part for other purposes? You can deduct interest only on the home-improvement portion.
Example: $100K HELOC. $60K used for kitchen renovation, $40K used for credit card debt consolidation. 60% of interest paid is deductible. Track the funds carefully — keep receipts and bank statements showing which dollars went where.
Documentation you should keep
The IRS doesn't require this upfront, but in case of audit (more common for high-deduction taxpayers), have:
- Contractor invoices showing home improvement work
- Building materials receipts
- Bank statements showing HELOC draw amounts and dates
- Bank statements showing payments to contractors and material suppliers (linking the draw to the use)
- Permits and inspection reports (further evidence of substantial improvements)
- Before/after photos (helpful but not required)
Keep these for at least 7 years after filing the return that claimed the deduction.
State income tax implications
States that conform to federal rules (most do) follow the same HELOC interest deductibility rules. States with no income tax (Florida, Nevada, Tennessee, Texas, Washington, etc.) make federal deductibility the only consideration.
A handful of states have their own deduction rules — California for example has specific provisions that occasionally diverge from federal. Check with your CPA for state-specific treatment.
What to do if you've been deducting interest you shouldn't have
If you've been deducting HELOC interest on funds used for non-qualifying purposes, the conservative move is to:
- Stop deducting it going forward
- Talk to your tax professional about whether to amend prior returns (depends on amounts and statute of limitations)
- Going forward, track HELOC use carefully and only deduct interest on the qualifying portion
Disclaimer
This is general information, not tax advice. HELOC tax rules have nuances and your specific situation may affect what's deductible. Consult a CPA or tax attorney for advice on your specific tax position.
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