In this guide
- The short answer
- Law update: OBBBA made the rules permanent
- What IRS Publication 936 actually says
- What qualifies — and what doesn't
- The $750,000 combined debt limit
- The standard deduction hurdle
- Worked example: does the deduction actually help Sarah?
- Documentation: what you need to prove the deduction
- Mixed-use HELOCs: multiple purposes
- Frequently asked questions
HELOC interest can be tax-deductible — but the conditions are specific, the paperwork matters, and for the majority of American homeowners, the standard deduction threshold means they receive no actual tax benefit even when they technically qualify. This guide gives you the full picture: what the rules are, what changed, what you need to document, and how to work out whether the deduction is genuinely worth anything for your situation.
One thing I'll say upfront: tax deductibility should be a secondary consideration when evaluating a HELOC, not the primary one. The rate saving and the flexibility of the draw structure are what make a HELOC financially useful. A potential tax deduction is a bonus — and only if you itemise.
The short answer
HELOC interest is tax-deductible if and only if three conditions are met:
- The HELOC funds were used to buy, build, or substantially improve the home that secures the loan
- Your total qualified home loan debt (first mortgage + HELOC) does not exceed $750,000 ($375,000 if married filing separately)
- You itemise your deductions on Schedule A — the standard deduction and the mortgage interest deduction are mutually exclusive; you can only claim one
If all three are true, the interest you paid on the HELOC during the tax year is deductible as home mortgage interest. If any one of the three is not true, the interest is not deductible — regardless of how the loan is structured or what you call it.
The IRS does not care whether you have a HELOC, a home equity loan, or a cash-out refinance. What matters is what the money was spent on. Using a HELOC to pay off credit cards, fund a holiday, buy a car, or cover living expenses means the interest is not deductible — full stop. The deduction follows the money, not the loan product.
Law update: the One Big Beautiful Bill Act made the rules permanent
The current HELOC interest deduction rules were originally introduced by the Tax Cuts and Jobs Act (TCJA) in 2017 and were scheduled to sunset on December 31, 2025 — potentially reverting to the more generous pre-2018 rules. That reversion did not happen. The One Big Beautiful Bill Act (OBBBA), signed into law on July 4, 2025, made the TCJA individual tax provisions permanent. The current rules — including the $750,000 debt limit and the use-of-funds requirement — are now the permanent law of the land, not temporary provisions. There is no further sunset to plan around.
This matters for planning purposes. Before the OBBBA passed, some homeowners were waiting to see whether the rules might revert to the pre-TCJA framework (which allowed deduction of home equity interest regardless of use, up to $100,000). That option is now definitively off the table. The current rules are permanent.
Source: IRS.gov — One Big Beautiful Bill Act provisions; Tax Foundation analysis.
What IRS Publication 936 actually says
IRS Publication 936 — Home Mortgage Interest Deduction is the primary IRS guidance document for this topic. The October 2025 edition states the rule directly in its reminders section:
"Home equity loan interest. No matter when the indebtedness was incurred, you can no longer deduct the interest from a loan secured by your home to the extent the loan proceeds weren't used to buy, build, or substantially improve your home."
— IRS Publication 936, October 2025 edition (irs.gov/pub/irs-pdf/p936.pdf)
The publication applies this rule equally to first mortgages, home equity loans, and HELOCs — it is a unified standard based on use of funds, not loan type. Publication 936 also defines the phrase "substantially improve" as work that adds value to the home, prolongs its useful life, or adapts it to new uses. Routine maintenance (painting, fixing a leaky tap) does not qualify as a substantial improvement. A kitchen renovation, bathroom addition, or structural extension does.
The full publication is available directly from the IRS at: irs.gov/pub/irs-pdf/p936.pdf
What qualifies — and what doesn't
- Kitchen renovation or extension
- Bathroom addition or remodel
- New roof, windows, or HVAC system
- Basement conversion or finishing
- Garage addition
- Accessibility modifications (ramp, lift)
- Solar panel installation
- Structural repairs that add value
- Paying off credit card debt
- Consolidating personal loans
- Buying a car or boat
- Funding tuition or education costs
- Covering medical bills
- Holidays or personal expenses
- Day-to-day living costs
- Investing in stocks or other assets
IRS Publication 936 distinguishes between routine maintenance (not deductible) and substantial improvements (deductible). Repainting a room is maintenance. Adding a room is an improvement. Replacing a broken boiler is maintenance. Replacing a boiler as part of a comprehensive energy-efficiency upgrade that increases the home's value may qualify. When in doubt, document the scope of work carefully and consult a tax professional — the IRS applies a facts-and-circumstances test, not a fixed list.
The $750,000 combined debt limit
Even when your HELOC funds qualify under the use-of-funds test, the deduction is subject to a combined debt ceiling. Under OBBBA-made-permanent rules, you can only deduct interest on the first $750,000 of total qualified home loan debt — combining your first mortgage and your HELOC together.
| Filing status | Maximum deductible home loan debt | Applies to loans taken out after… |
|---|---|---|
| Single / married filing jointly | $750,000 | December 15, 2017 |
| Married filing separately | $375,000 | December 15, 2017 |
| Pre-2018 mortgages (grandfathered) | $1,000,000 | Before December 16, 2017 |
Source: IRS Publication 936 (October 2025 edition).
For most homeowners this limit is not a practical constraint — a $500,000 mortgage plus a $60,000 HELOC totals $560,000, well below the $750,000 cap. It becomes relevant for homeowners in high-cost markets with large mortgages who are also drawing significant HELOC balances. If your combined total approaches or exceeds $750,000, only the interest on the first $750,000 of debt is deductible; you must prorate.
The standard deduction hurdle — the real reason most people get no benefit
This is the part that most articles on HELOC tax deductibility skip over — and it's the most practically important piece for the majority of homeowners.
To claim the mortgage interest deduction, you must itemise your deductions on Schedule A. But itemising only makes sense if your total itemised deductions exceed the standard deduction for your filing status. Since the TCJA nearly doubled the standard deduction in 2018 — and the OBBBA has now made those higher amounts permanent — the majority of homeowners never reach the itemisation threshold.
Here are the exact standard deduction figures, as published by the IRS following the OBBBA:
| Filing status | Current standard deduction | Prior year | Change |
|---|---|---|---|
| Single | $16,100 | $15,750 | +$350 |
| Married filing jointly | $32,200 | $31,500 | +$700 |
| Head of household | $24,150 | $23,625 | +$525 |
| Married filing separately | $16,100 | $15,750 | +$350 |
Sources: U.S. Bank / IRS adjustments; Tax Foundation.
To benefit from the mortgage interest deduction, a married couple filing jointly must have total itemised deductions — mortgage interest, HELOC interest, state and local taxes (now capped at $40,400 under OBBBA), charitable contributions, and other qualifying expenses — that exceed $32,200. If they don't, the standard deduction is larger and they should claim that instead, receiving zero additional benefit from their mortgage interest.
Tax Policy Center data shows the share of filers who itemise dropped from approximately 30% before the TCJA to around 9–11% after it. With the standard deduction increases now permanent under the OBBBA, that proportion will not increase materially. The practical implication: if you have a modest mortgage balance, a relatively small HELOC, and live in a lower-tax state, there is a reasonable chance the mortgage interest deduction provides you with no actual tax saving — even if your HELOC use technically qualifies.
Worked example: does the deduction actually help Sarah?
Worked example
Sarah in Ohio — checking whether itemising is worth it
Sarah and her husband file jointly. They have a $280,000 mortgage at 6.5% and a $45,000 HELOC at 7.43% which they drew entirely for a kitchen renovation. Both qualify under the use-of-funds test. Their combined loan balance ($325,000) is well below the $750,000 cap.
To beat the standard deduction through itemising, Sarah's total Schedule A deductions need to exceed $32,200. She adds up: mortgage interest ($21,544) + state income tax ($5,200, Ohio) + property taxes ($3,800) + charitable donations ($1,200) = $31,744 total.
Her itemised total of $31,744 is $456 less than the standard deduction of $32,200. She claims the standard deduction. The HELOC interest deduction — despite qualifying on every technical test — provides her with zero actual tax benefit.
Sarah's situation is common. Itemising is more likely to beat the standard deduction for homeowners with large mortgage balances (closer to $750,000), large HELOC balances, significant state income taxes (particularly in California, New York, New Jersey), and substantial charitable giving. If you're unsure whether your situation justifies itemising, a tax professional or even a free online itemisation calculator can give you a quick answer without a full return.
Documentation: what you need to prove the deduction
If you do itemise and claim the HELOC interest deduction, you need to be able to demonstrate both that you paid the interest and that the funds were used for qualifying purposes. The IRS can audit deductions, and a poorly documented home improvement claim is a common audit trigger.
- Form 1098 from your lender — this shows the total mortgage interest paid during the year. Your lender should issue this automatically for any loan on which you paid $600 or more in interest.
- Contractor invoices and receipts for all home improvement work funded by the HELOC. Keep originals and digital copies. These should clearly describe the work done and confirm payment.
- Bank statements showing HELOC draws matched to contractor payments. The paper trail from your HELOC account to the contractor's account strengthens your documentation significantly.
- Permits and planning documents for any structural work. Building permits issued by your local authority confirm the nature and scope of the improvement.
- Before-and-after photographs of the completed work. While not strictly required by the IRS, they provide useful supporting evidence in the event of a query.
- Proration calculation if you used HELOC funds for mixed purposes. Document the proportion used for qualifying vs. non-qualifying purposes.
The IRS generally has three years from the filing date to audit a return, and up to six years if it suspects substantial underreporting. For records related to home improvements — which may affect your capital gains calculation when you sell the property — keeping documentation for as long as you own the home is prudent.
Mixed-use HELOCs: when you use funds for multiple purposes
Many homeowners use a HELOC for more than one purpose — part for a renovation, part to clear a credit card, part for a new car. When a HELOC is used for both qualifying and non-qualifying purposes, you can only deduct the interest attributable to the qualifying (home improvement) portion.
The IRS requires you to prorate the interest based on the proportion of the outstanding balance that was used for qualifying purposes. If you drew $60,000 from your HELOC — $40,000 for a renovation and $20,000 for debt consolidation — then two-thirds of your HELOC interest is potentially deductible and one-third is not.
Your lender reports total interest paid on Form 1098 — it doesn't know or care what you spent the money on. The proration calculation, the documentation, and the accuracy of the deduction you claim are entirely your responsibility. This is another reason why keeping a clear paper trail of what each HELOC draw was used for is important from the day you open the line, not retrospectively at tax time.