Home Equity Tax Deductibility 2026: What You Can (and Can't) Write Off for HELOC, Home Equity Loan, Cash-Out Refi, HECM, and HEI

A mortgage interest deduction can shave thousands off a homeowner's tax bill — but only when the IRS rules actually allow it. And the rules are not the same across HELOCs, home equity loans, cash-out refinances, reverse mortgages, and home equity investments. This guide compares all five products side by side for 2026, walks through three real-math scenarios, and flags the four tax questions every homeowner should answer before signing anything.

How IRS Mortgage Interest Deduction Works in 2026

The federal mortgage interest deduction lives in Internal Revenue Code §163(h)(3) as "qualified residence interest." Three rules control what counts:

1. Acquisition indebtedness only. The deduction applies to interest on loans used to buy, build, or substantially improve the home that secures the loan. Interest on loans used for anything else — debt consolidation, a vacation, college tuition, paying off credit cards — is not deductible.
2. The dollar cap. For mortgages originated after December 15, 2017, the Tax Cuts and Jobs Act (TCJA) lowered the combined acquisition-debt cap to $750,000 ($375,000 if married filing separately). Mortgages originated on or before December 15, 2017 keep the prior $1,000,000 cap ($500,000 MFS) — and that grandfathered cap survives the TCJA sunset unless Congress acts.
3. The sunset. TCJA's individual provisions — including the $750,000 cap — are scheduled to revert to pre-2018 law at the end of 2025 unless extended. Track-forecasts suggest a partial or full extension is likely, but the actual 2026+ cap will depend on what Congress passes.

The official IRS framing lives at IRS Topic 409 — Interest Expense, and the consumer-facing framing at the CFPB's Owning a Home portal. Both are worth bookmarking before you make any product decision driven by the deduction.

5-Product Deductibility Comparison (2026)

Here is how the five most common home-equity-access products compare on tax deductibility as of 2026. Use this table as your quick-reference; the deep-dive rows below explain each entry.

Product-by-Product Deep Dive

HELOC (Home Equity Line of Credit)

HELOC interest is deductible only on the portion of the line used to buy, build, or substantially improve the home that secures the HELOC. If you draw $40,000 for a kitchen renovation and another $15,000 for credit-card payoff on the same line, only the $40,000 of home-improvement draws generates deductible interest — the $15,000 does not. The $750K cap (or grandfathered $1M cap for pre-2018 originations) applies to the HELOC combined with your primary mortgage, not separately.

The 2026 nuance: with HELOC variable rates commonly in the 9–10% range, the dollar amount of interest paid is meaningful, but a 24% marginal bracket only recovers a fraction of that. The deduction is real but rarely equals the headline rate. Homeowners in lower brackets (12–22%) should model the after-tax interest cost carefully before assuming the deduction makes a HELOC cheaper than alternatives.

Home Equity Loan (Fixed-Rate Lump-Sum)

Home equity loans follow the same §163(h)(3) test as HELOCs: deductible if used to buy, build, or substantially improve the home; not deductible if used for debt consolidation, tuition, or non-home purposes. The fixed-rate lump-sum structure means the use-of-funds test applies to the entire payout at funding — you can't slowly convert non-deductible draws into deductible ones by changing your spending pattern.

The 2026 nuance: many homeowners took out lump-sum HELs in 2020–2021 when rates were 5–6% and used the funds to consolidate other debt. Those interest payments are not deductible, regardless of the interest rate being otherwise attractive. If you're refinancing an old HEL for a new one in 2026, the new loan's deductibility depends entirely on what you do with the new funds — not on what the previous borrower did.

Cash-Out Refinance

Cash-out refinances are unique because the entire new loan balance is treated as acquisition indebtedness (assuming the loan is secured by your primary or designated secondary residence). That makes cash-out refis the most straightforward deduction case: every dollar of interest on the new (larger) balance is deductible in the same year, subject only to the $750K cap.

The 2026 nuance: this is also where the math gets uncomfortable. A $400,000 cash-out refi at 7% generates $28,000 in year-one interest — more than four times the typical HELOC draw. The full deduction applies, but the absolute interest paid is far higher than a partial HELOC draw. Homeowners with 2020–2021 vintage 3% mortgages face a rate-lock penalty that often dwarfs the tax savings even after the deduction.

HECM (Reverse Mortgage)

Per the CFPB, "interest on a reverse mortgage is tax deductible when the loan proceeds are used to buy, build, or substantially improve the home." HECM interest accrues over time rather than being paid monthly, so the deduction typically materializes when the loan eventually settles (sale of the home, refinance to a conventional mortgage, or death of the borrower) — at which point the accrued interest may be deductible in the settlement year.

The 2026 nuance: HUD raised HECM lending limits for 2025, and the 2026 limits are expected to follow similar adjustment paths. The product itself is unchanged in tax mechanics, but the larger available proceeds mean more homeowners are entering the HECM deduction conversation in 2026 than in prior years. The CFPB portal at consumerfinance.gov/owning-a-home/ has the current consumer-facing framing.

Home Equity Investment (HEI)

An HEI is structurally different: there is no interest charge, so there is no interest to deduct. The trade is cash today for a percentage of the home's future appreciation. Because no debt instrument exists, no §163 mortgage interest analysis applies.

The 2026 nuance: the IRS has not issued definitive guidance on HEI tax treatment — but the consensus position from major HEI providers (including Hometap) is that the upfront payment is not taxable income in the year received, and the appreciation share at settlement reduces the homeowner's taxable gain on sale. The full mechanics — including basis adjustment, settlement treatment, and the $250K/$500K primary-residence exclusion — are covered in our HEI tax implications guide. If "no interest, no deduction, no added debt" sounds like a cleaner tax profile than a deductible-but-indebted product, the HEI shape is built for that trade-off.

2026 Tax-Law Updates Worth Knowing

• TCJA mortgage interest caps. Post-2017 originations: $750,000 ($375K MFS). Pre-2018 originations: $1,000,000 grandfathered cap ($500K MFS). Both are tracked at IRS Topic 409.
• 2026 sunset timing. TCJA's individual provisions — including the $750K mortgage interest cap — are scheduled to revert to pre-2018 law at the end of 2025 unless Congress extends them. Track-forecasts suggest extension is more likely than reversion, but final 2026+ law depends on what Congress passes.
• IRS guidance clarity gradient. HELOC / HEL / cash-out refi / HECM deduction rules are well-established by §163(h)(3) and decades of IRS guidance. HEI deductibility is N/A by structure; HEI taxability and settlement treatment is an evolving area with no definitive IRS ruling.
• State conformity varies. Some high-tax states (CA, NY, NJ) and some no-income-tax states (FL, TX, WA) treat the mortgage interest deduction differently for state purposes. The federal deduction is not the whole story.

For authoritative consumer-facing framing, the CFPB's Owning a Home portal and IRS Topic 409 together cover the federal angle; consult a CPA for state treatment in your jurisdiction.

3 Real Scenarios — Same Homeowner, Three Products, Three Tax Outcomes

Picture the same homeowner three times: $500,000 home, $200,000 existing mortgage at 3.2%, $80,000 cash need. The only thing that changes is the product chosen to access that $80,000. Here is how the three tax outcomes stack up:

Scenario A: Cash-Out Refinance → Buys Second Property

The homeowner refinances the $200,000 balance to a new $280,000 mortgage at 7% and uses the $80,000 difference as the down payment on a second property. The entire new $280,000 balance counts as acquisition indebtedness for the primary home; interest is fully deductible subject to the $750K cap. The $200,000 mortgage is now $200,000 + $80,000 of cap utilization = $280,000 against the cap, well below $750,000.

Deduction value at 24% bracket: Year-one interest of ~$19,600 produces ~$4,700 of federal tax savings. The new property's mortgage would have its own (separate) cap-utilization, but proceeds used to buy the second property are also acquisition indebtedness per IRS rules.

Scenario B: HELOC at 9% → Renovates Primary Residence

The homeowner draws $80,000 from a HELOC at 9% variable and uses it all to renovate the kitchen. Every dollar of interest on the HELOC is deductible because the use-of-funds test is satisfied. Year-one interest of ~$7,200 yields ~$1,700 of federal tax savings at the 24% marginal rate.

The math is the simplest of the three: full deductibility, partial interest cost, modest tax savings. The HELOC's variable rate means the deduction grows if rates rise — but so does the out-of-pocket interest.

Scenario C: Hometap HEI → Funds Home Improvements

The homeowner receives $80,000 from Hometap for a 10-year equity-sharing agreement on a home currently worth $500,000. There is no interest charge, so there's nothing to deduct. There is also no new debt on the home — nothing shows up on a credit report, nothing accrues against the $750K cap.

The tax picture is upside-down relative to scenarios A and B: no deduction, no interest cost, no cap utilization. At settlement, the appreciation share is a capital transaction if the home is sold — usually absorbed by the primary-residence exclusion.

4 Decision Questions

1. Is your use of funds "buy, build, or substantially improve"? If yes — full deductibility applies (HELOC, HEL, cash-out refi, qualifying HECM). If no — you have a product decision, not a tax decision.
2. Is your loan post-2017 ($750K cap) or pre-2018 ($1M grandparent cap)? The cap directly limits the deductible interest dollar amount. Verify whether the refinance you're considering restarts your cap exposure.
3. At your marginal tax rate, is the deduction worth the interest cost? A 32% bracket recovers about a third of the interest paid. A 12% bracket recovers less than an eighth. The deduction is real but rarely makes a 9% product behave like a 6% product.
4. Is "no deduction / no added debt" (HEI) a better tax shape than "deductible but indebted"? Homeowners who don't itemize, who face state-level quirks, or who simply don't want to add debt may find the HEI's clean tax profile more valuable than the deduction itself.

5 Frequently Asked Questions

Is HELOC interest tax deductible in 2026?

Yes — but only when the HELOC proceeds are used to "buy, build, or substantially improve" the home securing the HELOC, per IRC §163(h)(3). If you draw from a HELOC to pay off credit cards or fund a vacation, that portion of the interest is not deductible. The combined HELOC + primary mortgage balance is capped at $750,000 for loans originated after December 15, 2017 (TCJA) or $1,000,000 for pre-2018 originations. The deduction appears on Schedule A if you itemize. Consult a CPA to confirm your specific eligibility; the IRS framing lives at Topic 409.

What is the $750,000 mortgage interest deduction cap for 2026?

The $750,000 cap applies to combined acquisition indebtedness across your primary mortgage, any HELOC, and any home equity loan, for loans originated after December 15, 2017, under the Tax Cuts and Jobs Act. If your mortgage was originated on or before December 15, 2017, the prior $1,000,000 cap is grandfathered — and survives the TCJA sunset unless Congress acts to consolidate. The TCJA's individual provisions (including the $750K cap) are scheduled to sunset at the end of 2025, which means 2026 may see a reversion to pre-2018 law unless Congress extends them. Track the actual rule for the year you file via IRS Topic 409, and consult a CPA before claiming any deduction amount above what the cap allows.

Can I deduct interest on a cash-out refinance?

Yes — under §163(h)(3), the entire new loan balance of a cash-out refinance is treated as acquisition indebtedness (assuming the refinanced loan is secured by your primary or designated secondary residence). Every dollar of interest on the new, larger balance is deductible in the year you pay it, subject only to the $750K TCJA cap (or grandfathered $1M cap). The appeal of a cash-out refi is that you don't have to satisfy the use-of-funds test for individual draws — the whole loan is acquisition debt by structure. The 2026 caveat: cash-out refis at 7–8% generate far higher absolute interest than a HELOC draw, even with full deductibility. Run the after-tax interest math before assuming the deduction makes a refi cheaper than a partial draw.

Is reverse mortgage (HECM) interest deductible?

Conditionally yes — the CFPB's standard framing is that HECM interest is tax deductible when the loan proceeds are used to buy, build, or substantially improve the home that secures the reverse mortgage. In practice, deductible HECM interest typically materializes at settlement (sale of the home, refinance to pay off the HECM, or death of the borrower), when years of accrued interest may qualify as deductible in that settlement year. Because HECMs accrue interest rather than requiring monthly payments, the year-by-year Schedule A picture looks very different from a HELOC. The 2026 HECM lending limits were adjusted upward for 2025 and are expected to follow a similar path in 2026 — consult the HUD limit announcements and CFPB's Owning a Home portal for the current numbers. A CPA with reverse-mortgage experience should review any HECM settlement scenario before you file.

Can I deduct anything on a home equity investment (HEI)?

No — there's no interest to deduct on an HEI; the product works on equity sharing instead. Hometap and other HEI providers exchange cash today for a percentage of your home's future appreciation. There is no interest rate, no monthly payment, and no debt instrument that would trigger §163(h)(3) analysis. What does apply: the upfront HEI payment is generally not treated as taxable income in the year received, the appreciation share at settlement reduces your taxable gain on sale, and the $250K/$500K primary-residence exclusion usually absorbs most or all of that gain for primary residences. The full tax mechanics — including basis adjustment and non-sale settlement scenarios — are covered in our HEI tax implications guide. Because no IRS ruling specifically addresses HEI tax treatment, working with a CPA before settlement remains essential.