Cash-Out Refinance Tax Implications: What's Deductible and What Isn't

A cash-out refinance gives you a lump sum of cash — but the tax treatment of that cash, and of the interest you'll pay on it, depends entirely on how you use the proceeds. Getting this wrong leads to disallowed deductions and unexpected tax bills.

Here's how the IRS rules work in 2026, with notes on how other countries handle the same question.

Is Cash-Out Refinance Proceeds Taxable Income?

No. The proceeds from a cash-out refinance are not income — they are debt. You are borrowing money secured by your home. The IRS doesn't treat loan proceeds as taxable income, regardless of how much you extract or what you do with it.

The tax question isn't about the proceeds — it's about the interest.

The IRS Tracing Rules: What Makes Interest Deductible

Under IRS rules, mortgage interest on a cash-out refinance is only deductible if the proceeds are used for a qualifying purpose. The IRS "traces" the use of borrowed funds to determine deductibility.

There are two components of a cash-out refinance:

1. The original acquisition indebtedness portion: This is the balance of your existing mortgage that you're refinancing — money you originally borrowed to buy the home. Interest on this portion remains fully deductible (within principal limits, described below), regardless of what you do with the cash-out proceeds.

2. The cash-out portion: This is the additional amount borrowed above your existing balance. Interest on this portion is only deductible if the funds are used to "buy, build, or substantially improve" the home that secures the loan.

This is the core tracing rule: the purpose of the new money determines whether the interest is deductible.

What Qualifies as "Substantially Improve"

Capital improvements that qualify include:

• Kitchen remodels, bathroom additions, or major renovations
• Room additions or structural expansions
• Replacement of major systems (roof, HVAC, windows, plumbing)
• Building a garage or accessory dwelling unit

What does not qualify:

• Routine maintenance and repairs (painting, patching, minor plumbing fixes)
• Personal purchases (cars, vacations, electronics)
• Paying off credit card debt or personal loans
• Funding investments or business expenses

If you use cash-out proceeds to consolidate credit card debt, that portion of the interest is treated as personal interest under IRS rules — and personal interest is not deductible.

The $750,000 Principal Limit

Even when interest qualifies as deductible, there's a cap on how much principal can produce deductible interest:

• For loans originated after December 15, 2017: Interest is deductible on up to $750,000 of mortgage debt ($375,000 if married filing separately)
• For loans originated on or before December 15, 2017 (grandfathered): Interest is deductible on up to $1,000,000 of mortgage debt

This limit applies to the total of all secured mortgage debt on the residence (first mortgage + cash-out portion + any second mortgage or HELOC). Interest on debt above these caps is not deductible.

The 2026 Standard Deduction Reality

Under the One Big Beautiful Bill Act (OBBBA) of 2026, the standard deduction is substantially elevated. For most middle-income homeowners, their total itemized deductions — including mortgage interest, state and local taxes, charitable contributions, and medical expenses — won't exceed the standard deduction threshold.

If you take the standard deduction (which most Americans do), the mortgage interest deduction provides zero marginal tax benefit, because you'd already be deducting more than your actual itemized expenses.

This means the tax argument for using cash-out proceeds for home improvements (rather than consumer debt) is primarily about compliance and avoiding a disallowed deduction — not about claiming a benefit most people will actually receive.

For high-income borrowers with large loan balances in high-tax states (where SALT deductions add to the total), itemizing may still make sense. For most homeowners with loans under $500,000 and moderate income, the standard deduction makes the mortgage interest deduction moot as a planning variable.

The PMI Deduction Reinstatement

The 2026 OBBBA permanently reinstated the PMI deduction. Mortgage insurance premiums (PMI, FHA MIP, VA Funding Fees, USDA guarantee fees) can be deducted as mortgage interest, subject to a phaseout:

• Full deduction available up to $100,000 AGI (single) or $100,000 (joint)
• Phases out completely at $110,000 AGI

This affects cash-out refinance math if the transaction pushes your LTV above 80%, triggering PMI. The additional cost of PMI may be partially offset by the deduction for qualifying taxpayers.

Amortizing Discount Points on a Refinance

If you pay discount points to buy down your interest rate, the tax treatment differs from a purchase loan:

• Purchase loans: Points are deductible in the year paid
• Refinance loans: Points must be amortized over the life of the loan — deducted in equal fractions each year (e.g., 1/30th per year on a 30-year refinance)

Exception: If a portion of the cash-out proceeds is used for capital improvements and the points are paid with unborrowed funds, that portion of the points may be deductible in the year paid.

UK: Section 24 and Buy-to-Let Refinancing

UK homeowners refinancing a primary residence face no direct tax on cash-out proceeds.

For UK landlords, the picture changed fundamentally with Section 24 of the Finance (No. 2) Act 2015. Individual landlords can no longer deduct mortgage interest from rental income directly. Instead, they receive a 20% basic rate tax credit.

The effect: landlords whose gross rental income (including the interest they can't deduct) pushes them into higher tax brackets may face effective tax rates on net profit exceeding 50%. This has driven many UK landlords to remortgage investment properties into Limited Company structures, where mortgage interest remains fully deductible as a business expense.

If you're a UK landlord considering a remortgage to extract equity from an investment property, the tax structure of ownership significantly affects the after-tax cost of the debt.

Australia: Tracing Rules and Mixed-Purpose Loans

The Australian Taxation Office (ATO) applies a purpose test to interest deductibility — deductibility follows the use of borrowed funds, not the security.

For investment property refinancing, the ATO requires strict apportionment if a single loan is used for mixed purposes. If you refinance an investment property and use part of the proceeds for a personal purchase (car, holiday), the loan becomes a "mixed-purpose loan." Interest must be split between the deductible investment portion and the non-deductible personal portion.

Australian tax specialists recommend splitting mixed-purpose loans into two separate accounts at refinancing — one for the investment portion and one for the personal portion. This simplifies ATO compliance and protects the deductible interest from audit challenge.

For refinancing a primary residence with cash-out: proceeds used for investment purposes (buying shares, funding a rental property deposit) may produce deductible interest on the cash-out portion, because the purpose — not the security — determines deductibility in Australia.

Canada: Mortgage Interest Is Not Deductible on Primary Residences

Unlike the US, Canada does not provide a tax deduction for mortgage interest on a primary residence. A cash-out refinance on your principal home has no tax implication for the interest you'll pay.

The exception is the Smith Manoeuvre strategy: if you structure a re-advanceable mortgage and use HELOC drawdowns specifically to purchase income-generating investments (shares, rental properties), that HELOC interest becomes deductible under CRA rules because the borrowed money is traced to income-producing assets. The primary mortgage interest remains non-deductible.

Tax treatment is one input in the overall refinancing decision. For most US homeowners, the practical reality is that the standard deduction makes the mortgage interest deduction moot. The bigger variables are the break-even point and the total interest cost of the new loan. The Refinancing Decision Worksheet works through both — including a US deductibility check that compares your projected itemized deductions against the current standard deduction to determine whether the tax benefit is real for your situation.