This article is educational and not tax advice; consult a CPA or enrolled agent before filing. Unless a different year is noted inline, all tax figures reflect tax year 2026.
TL;DR — Quick Verdict
- Cash-out proceeds are not taxable income — but only the portion you spend to buy, build, or substantially improve the home securing the loan generates deductible interest.
- Total deductible acquisition debt is capped at $750,000 ($375,000 married filing separately) for loans taken after December 15, 2017; the One Big Beautiful Bill Act made that cap permanent.
- The 2026 standard deduction is $32,200 for married couples filing jointly and $16,100 for single filers — most cash-out borrowers never clear it, making the deduction worth $0.
- At the Freddie Mac 30-year average of 6.55%, a $100,000 cash-out taken for debt consolidation produces roughly $6,500 of first-year interest and zero federal deduction.
- Rocket Mortgage, loanDepot, and Better all originate cash-out loans without verifying use of proceeds — the IRS tracing burden falls entirely on you.
- Recommendation: run the itemization math before you pick a loan structure, not after closing.
Roughly nine in ten American households take the standard deduction, which means the mortgage interest deduction — the single most-cited justification for tapping home equity — delivers nothing to most of the people who cite it. That gap between assumption and outcome gets expensive fast. A homeowner pulling $150,000 out at the Freddie Mac Primary Mortgage Market Survey average of 6.55% adds close to $9,800 in annual interest, and if that money went to a boat, a business, or a credit card payoff, none of it reaches Schedule A.
The confusion is understandable. IRS Publication 936 governs the deduction, and its central rule is not about loan labels at all — it’s about where the dollars went. Lenders including Rocket Mortgage and loanDepot will happily close a cash-out refinance without asking, because tracing proceeds is your job, not theirs.
This article covers what portion of your interest is deductible under 2026 rules, how the $750,000 acquisition-debt cap interacts with proceeds you spent elsewhere, why the raised state and local tax cap changed the itemization calculation for high-tax-state homeowners, and how the deduction compares against the alternative of leaving your first mortgage alone.
What the IRS Actually Deducts: Acquisition Debt vs. Everything Else
Internal Revenue Code §163(h) splits every dollar of mortgage debt into two buckets. Acquisition debt is money used to buy, build, or substantially improve the qualified residence that secures the loan. Everything else — home equity indebtedness in IRS language — produces no deduction at all under rules the One Big Beautiful Bill Act (P.L. 119-21, §70108) made permanent effective for tax years beginning after December 31, 2025.
Refinancing does not reset that classification. When you replace a $300,000 mortgage with a $450,000 cash-out loan, the first $300,000 keeps its original acquisition-debt character. The $150,000 of new money gets tested on its own: spend it on a kitchen gut renovation and it joins the acquisition bucket; spend it on tuition and it produces nondeductible interest for the full 30-year term.
Substantial improvement carries a specific meaning. The work must add value to the property, prolong its useful life, or adapt it to new uses. A new roof, an added bathroom, an HVAC replacement, and a foundation repair all qualify. Repainting, carpet replacement, and appliance swaps generally do not. The improvement must also be made to the same property securing the loan — using a cash-out on your primary residence to renovate a vacation home fails the test, as IRS Notice 2018-32 illustrates directly.
Mixed use is the common case, and it requires proportional allocation. If $90,000 of a $150,000 cash-out funds an addition and $60,000 retires credit card balances, 60% of the new-money interest is deductible and 40% is not. Understanding rolling high-interest debt into a mortgage matters here precisely because that use case produces the least favorable tax outcome available.
2026 Limits, Thresholds, and What Each One Costs You
Four separate numbers determine whether your deduction survives. Miss any one and the rest stop mattering.
Sources: Internal Revenue Service, Revenue Procedure 2025-32 and Publication 936 (verify at irs.gov); Federal Housing Finance Agency (verify at fhfa.gov).
That last row deserves attention. You can now originate a conforming cash-out loan of $832,750 while only $750,000 of it can ever produce deductible interest — an $82,750 gap the tax code simply ignores.
One more limit applies to high earners. Beginning in 2026, IRC §68(a) as amended by the OBBBA reduces otherwise-allowable itemized deductions by 2/37 for taxpayers in the 37% bracket, which starts at $640,600 of taxable income for single filers and $768,700 for joint filers. The practical effect: every deductible mortgage interest dollar is worth 35 cents to those filers rather than 37.
Running the Numbers: A $150,000 Cash-Out Under Three Different Uses
Take a married couple in Ohio with a $320,000 balance at 4.1% from a 2021 purchase. They refinance into a $470,000 loan at the current Freddie Mac 30-year average of 6.55%, pulling $150,000. Their state and local taxes total $14,000. First-year interest on the new loan runs approximately $30,600.
Scenario one — the entire $150,000 funds a permitted addition and structural work. All $470,000 is acquisition debt, comfortably under $750,000, so all $30,600 of interest is deductible. Combined with $14,000 of SALT, itemized deductions reach $44,600, exceeding the $32,200 standard deduction by $12,400. At a 22% marginal rate, the itemizing decision is worth roughly $2,728.
Scenario two — the $150,000 pays off credit cards and a car loan. Only the $320,000 legacy balance is acquisition debt, so approximately 68% of the interest qualifies: about $20,800. Itemized deductions total $34,800 against a $32,200 floor. The incremental benefit collapses to about $572.
Scenario three — same couple, same debt payoff, but they live in a no-income-tax state with $4,000 in property taxes. Itemized deductions reach $24,800, below the standard deduction. Federal benefit: zero. The refinance may still make sense, but the tax argument contributed nothing to it, and anyone building a case around refinance break-even math before applying needs to model the deduction at its real value rather than its advertised one.
Notice what moved the outcome. Not the loan size, not the rate — the use of proceeds and the state tax bill. Both are known before you sign anything.
Cash-Out Refinance vs. HELOC: Which Preserves More Deduction?
Tax treatment is identical between the two products. IRS rules attach to how proceeds are used, not to whether the debt sits in first or second position. Where they diverge is in what the transaction does to the rest of your mortgage.
Rate sources: Freddie Mac Primary Mortgage Market Survey, week of July 16, 2026 (verify at freddiemac.com); Bankrate national lender survey, July 2026 (verify at bankrate.com). Closing cost range reflects lender-published planning estimates.
The tracing column drives more audit outcomes than the rate column. A HELOC draw of $60,000 wired to a contractor on a dated statement is straightforward substantiation. A cash-out refinance deposits a single lump sum that mingles with your payoff and your checking account, and reconstructing the trail three years later during an examination is considerably harder.
Against that, the rate spread runs 88 basis points in the refinance’s favor — but only if you’re replacing a mortgage priced above 6.55%. Anyone sitting on a 3.5% loan destroys far more value by resetting the whole balance than the deduction could ever return, which is the core issue in any cash-out refinance vs HELOC cost comparison.
Verdict
For purely tax-driven decisions, the HELOC wins. Identical deductibility, dramatically cleaner substantiation, no closing costs consumed, and no disturbance to a below-market first mortgage. The cash-out refinance earns its place only when your existing rate already exceeds current market pricing, or when the amount needed is large enough that the fixed-rate certainty outweighs 88 basis points and a five-figure closing bill.
Five Mistakes That Cost Borrowers the Deduction
Every error below is documented in IRS guidance, and every one of them is committed after closing, when it’s too late to restructure.
Mistake 1: Treating Form 1098 as authorization. Your lender reports total interest paid, not deductible interest. The consequence is a Schedule A overstatement that survives until examination. Correct action: calculate your acquisition-debt fraction separately and deduct only that share, regardless of what box 1 says.
Mistake 2: Depositing proceeds into a general checking account. Commingling destroys traceability. Under IRS tracing rules, proceeds you cannot follow to a qualifying improvement default to nondeductible. Correct action: open a dedicated account, deposit the cash-out there, and pay contractors from it exclusively.
Mistake 3: Deducting closing costs as interest. Appraisal fees, title fees, attorney fees, notary fees, and inspection fees are not interest under Publication 936 and cannot be deducted or amortized as points. Correct action: add them to basis where eligible, and review a full itemized list of refinance fees to see which line items are which.
Mistake 4: Deducting refinance points in the year paid. Points on a purchase mortgage can often be deducted immediately; points on a refinance must be amortized across the loan term. On a 30-year loan, $6,000 in points yields $200 per year, not $6,000. Correct action: amortize, and deduct the unamortized remainder in the year the loan is retired.
Mistake 5: Assuming grandfathered debt survives the cash-out. A pre-December 16, 2017 mortgage keeps the $1,000,000 cap on refinance only if the new principal does not exceed the old balance. Taking cash out breaks that condition for the excess. Correct action: if you hold grandfathered debt above $750,000, price a second lien instead of resetting the first.
Who Should Structure a Cash-Out Around the Deduction?
Three conditions must hold simultaneously. Fail one and the tax planning stops paying for itself.
First, your itemized deductions must exceed $32,200 jointly or $16,100 singly without heroic assumptions. In practice this means a meaningful SALT bill — the raised $40,400 cap makes this achievable for homeowners in California, New York, New Jersey, and Illinois who were stuck at $10,000 through 2024. Second, the money must fund genuine capital improvements, documented with permits, contracts, and invoices. Third, your combined acquisition debt must land under $750,000.
Retirees present a particular case. Filers 65 and over can claim an additional deduction amount on top of the base standard deduction, which raises the itemization bar further and makes the mortgage interest deduction correspondingly harder to reach. A 68-year-old with a paid-down balance and modest property taxes almost certainly should not structure a refinance around tax outcomes.
Investors face the opposite situation, and it’s the most favorable one in the code. Interest on funds used to improve a rental property is deductible against rental income on Schedule E without any itemization requirement and without the $750,000 residential cap — a structural advantage worth understanding before comparing rental property refinance rates and rules against primary-residence pricing.
Everyone else should treat the deduction as a rounding error and decide on cash flow, rate, and term. If the loan doesn’t work before taxes, it rarely works after. That principle is worth applying alongside the broader list of scenarios where refinancing math fails, and it holds equally for anyone weighing a rate-and-term refinance calculation instead.
What Changed for 2026
Three changes took effect January 1, 2026, and two of them help.
Permanence arrived first. Before the One Big Beautiful Bill Act, the $750,000 cap was scheduled to expire after 2025 and revert to $1,000,000. Section 70108 blocked that reversion permanently while also making the home equity indebtedness disallowance permanent. Planning horizons extended, but the ceiling stayed low.
Mortgage insurance premiums returned as deductible qualified residence interest under IRC §163(h)(3)(F)(i)(III), effective for tax years beginning after December 31, 2025. The catch is severe: the deduction phases out by 10% for each $1,000 of AGI above $100,000 and disappears entirely at $110,000. Cash-out borrowers exceeding 80% loan-to-value who trigger mortgage insurance will mostly earn too much to use it.
The SALT cap rose to $40,400 from $40,000 in 2025, with the phase-down threshold moving to $505,000 of modified adjusted gross income. This is the change that most affects cash-out deduction planning, because it pulls filers over the itemization line who previously had no use for mortgage interest at all. It also expires: the cap reverts to $10,000 in 2030 absent congressional action, meaning a 30-year loan structured around today’s itemization math will spend most of its life under different rules.
Frequently Asked Questions
Is cash-out refinance money taxable income?
No. The IRS treats cash-out proceeds as borrowed funds you must repay, not income, so nothing is reported on your return and no capital gains tax is triggered. The tax question is entirely about deductibility of the resulting interest, which depends on whether proceeds funded improvements to the securing property under IRS Publication 936.
How does the IRS verify how I spent the money?
Through examination, not at closing. Lenders do not report use of proceeds. If audited, you must produce contracts, invoices, permits, and bank records tracing proceeds to qualifying work. IRS tracing rules place the entire substantiation burden on the taxpayer, which is why a segregated account for the proceeds is worth the ten minutes it takes to open.
Can I deduct interest if my balance exceeds $750,000?
Partially. Publication 936 provides a qualified loan limit worksheet that prorates interest by the ratio of the $750,000 cap to your average balance. A $900,000 acquisition-debt balance yields roughly 83% deductibility. Grandfathered pre-December 16, 2017 debt uses the $1,000,000 cap instead, but cashing out above the prior balance forfeits that treatment on the excess.
Does paying off a HELOC with a cash-out refinance count as acquisition debt?
Only if the original HELOC funds went to improvements. Character follows the underlying use, not the payoff. A HELOC that financed a kitchen remodel retains acquisition-debt status when refinanced into the first mortgage; one that funded tuition does not, and refinancing it changes nothing about its treatment under IRC §163(h).
How We Researched This Article
Every tax figure in this article was pulled from primary federal sources rather than secondary summaries. The $750,000 and $375,000 acquisition-debt caps, the $1,000,000 grandfathered limit, the substantial improvement standard, the points amortization rule, and the treatment of closing costs come from IRS Publication 936. The 2026 standard deduction amounts of $32,200, $16,100, and $24,150, along with the 37% bracket thresholds of $640,600 and $768,700 and the $40,400 SALT cap, come from IRS Revenue Procedure 2025-32. The tracing and mixed-use allocation framework follows IRS guidance on home equity loan interest, which supplies the worked examples this article’s allocation method mirrors.
Statutory changes effective in 2026 — the permanence of the $750,000 cap, the permanent home equity indebtedness disallowance, the restored mortgage insurance premium deduction with its $100,000 AGI phase-out, and the 2/37 itemized deduction limitation under IRC §68(a) — were traced to Public Law 119-21 and confirmed against professional tax analyses from Thomson Reuters and multiple accounting firms.
Rate figures are measured, not modeled. The 6.55% 30-year and 5.93% 15-year averages come from the Freddie Mac Primary Mortgage Market Survey for the week ending July 16, 2026, which reflects conventional conforming purchase loans at 80% loan-to-value for excellent-credit borrowers — cash-out pricing typically runs above these figures because of loan-level price adjustments. The 7.43% HELOC average comes from Bankrate’s national lender survey, based on a $30,000 line at 700 FICO and 80% combined loan-to-value; Curinos reported a materially different 7.23% average for higher-credit applicants during the same period, and readers should treat the HELOC market as a range rather than a point.
The three-scenario model in this article is modeled, not measured. It assumes a 22% marginal federal rate, straight first-year interest approximation, and no state income tax deduction interaction beyond the stated SALT totals. Actual outcomes vary with amortization timing, filing status, alternative minimum tax exposure, and state conformity to federal rules — several states do not follow the federal $750,000 cap. Closing cost ranges of 2% to 6% reflect lender-published planning estimates rather than a single measured survey; ClosingCorp’s most recent full-year refinance data put average costs near $2,403, or 0.72% of loan amount, which sits well below typical lender planning ranges because it excludes many prepaid items. We report the wider range because it better reflects what borrowers are quoted. Research last conducted July 2026. All figures were verified against named primary sources before publication.