Is Home Equity Loan Interest Tax Deductible? 2026 OBBBA Rules Explained

The tax deductibility of home equity interest is one of the most misunderstood topics in residential finance — and it changed dramatically in 2017, was widely expected to change again in 2026, and then stayed exactly the same due to legislation most homeowners have never heard of.

Here's the current state, precisely.

The Core Rule: Use of Proceeds Determines Deductibility

Under IRS Publication 936 and the permanent rules now in effect for 2026, HELOC and home equity loan interest is deductible only if the borrowed funds are used to buy, build, or substantially improve the specific residence that secures the loan.

That's a strict requirement. The deductibility is tied to the use of proceeds, not the product type.

Qualified (deductible) uses:

• Paying a contractor to renovate the kitchen of the home securing the HELOC
• Adding a room, finishing a basement, or building an addition
• Replacing the roof, HVAC, or other structural systems
• Any capital improvement that "substantially improves" the secured property

Non-qualified (not deductible) uses:

• Paying off credit card debt
• Funding a child's college tuition
• Buying an investment property
• Purchasing a vehicle
• Taking a vacation or covering living expenses

The IRS requires a clean paper trail. If you're claiming the deduction, you need contractor invoices, materials receipts, and documentation of payment that traces every dollar borrowed to qualified home improvements. An audit without documentation loses the deduction.

How the 2026 Rules Became Permanent

The Tax Cuts and Jobs Act (TCJA) of 2017 introduced the "buy, build, or substantially improve" requirement and reduced the deductible debt ceiling from $1 million to $750,000. These restrictions were always written with a sunset date: they were scheduled to expire December 31, 2025, and the older, more generous pre-2017 rules would have automatically returned in 2026.

Many homeowners and some financial advisors anticipated this reversal and planned around it.

It didn't happen.

The One Big Beautiful Bill Act (OBBBA), passed on July 4, 2025, made the TCJA's mortgage interest provisions permanent. If you've read older financial articles suggesting the rules would revert in 2026, that information is now definitively wrong. The $750,000 cap and the use-of-proceeds requirement are locked in indefinitely.

Any content suggesting the mortgage interest deduction becomes more generous in 2026 reflects the pre-OBBBA expectation, not the current law.

The $750,000 Acquisition Debt Ceiling

Even if your funds are used for qualifying home improvements, there's a hard ceiling on eligible debt. The combined principal balance of your primary mortgage plus any home equity debt cannot exceed $750,000 ($375,000 for married filing separately) to fully deduct the interest.

If you exceed that ceiling, you can only deduct a proportional share of your interest.

Example: Primary mortgage balance: $650,000. HELOC used for qualified home improvements: $175,000. Total debt: $825,000.

The deductible share: $750,000 ÷ $825,000 = 90.9%. You can deduct approximately 90.9% of your total mortgage and HELOC interest. The remaining 9.1% is not deductible.

For most homeowners with primary mortgages below $500,000, this ceiling doesn't apply. For homeowners in high-cost markets (coastal metros, major cities) who purchased at high prices, the ceiling is a real constraint.

The OBBBA Changes That Actually Help Homeowners in 2026

The OBBBA did introduce two provisions that benefit many homeowners:

PMI as deductible interest: Starting in 2026, private mortgage insurance premiums are treated as deductible mortgage interest. For homeowners who put down less than 20% and pay PMI on their primary mortgage, this is new relief — particularly for recent purchasers.

SALT deduction cap raised to $40,000: The State and Local Tax deduction (which includes property taxes) was capped at $10,000 under the TCJA. The OBBBA raised this to $40,000 for tax years 2025 through 2029.

This is indirectly significant for mortgage interest deductibility. Under the previous $10,000 SALT cap, many homeowners in high-tax states (California, New York, New Jersey, Massachusetts, Illinois) couldn't itemize enough deductions to exceed the standard deduction, making all their mortgage interest deductions worthless. With a $40,000 SALT cap, many of these homeowners will now find itemizing beneficial — and with itemization, the mortgage interest deduction (including qualifying HELOC interest) becomes accessible again.

You Must Itemize to Claim Any of This

Every piece of the mortgage interest deduction is completely irrelevant if you take the standard deduction. You can only claim mortgage or HELOC interest as a deduction if your total itemized deductions exceed the standard deduction amount for your filing status.

For 2026, the standard deduction is approximately $15,000 for single filers and $30,000 for married filing jointly (adjusted for inflation from TCJA levels). Many homeowners — particularly in lower-tax states — won't exceed this threshold through mortgage interest and property taxes alone.

Run the comparison before assuming you'll benefit: total your mortgage interest, property taxes (up to the new $40,000 SALT cap), charitable contributions, and other itemizable deductions. If the sum exceeds the standard deduction, itemize and claim the mortgage interest. If not, the deduction provides no benefit.

Practical Record-Keeping for HELOC Renovation Claims

If you're using a HELOC for qualified home improvements and plan to deduct the interest:

1. Maintain separate bank records showing HELOC draws were transferred specifically to pay contractors or suppliers
2. Keep every contractor invoice, change order, and materials receipt
3. Keep proof of payment (bank statements, checks, wire transfer confirmations) connecting the HELOC draw to the qualifying expenditure
4. Document the improvement with photos and permit records where applicable

The IRS doesn't require you to submit these documents upfront — you report the deduction on Schedule A — but you must be able to produce them if audited. The deduction can be disallowed entirely if documentation is insufficient.

The Home Equity & HELOC Planning Guide includes a tax implications overview covering the OBBBA rules, the $750,000 debt ceiling, the qualified vs. non-qualified use analysis, and a documentation checklist for homeowners planning to claim the mortgage interest deduction on renovation-funded HELOC interest.