Refinancing and the Mortgage Interest Deduction (2026 Guide)

If you refinanced your home or are thinking about it, you may be wondering how refinancing affects the mortgage interest deduction.

The good news is that refinance interest is often still deductible, but certain rules and limits apply.

Mortgage interest deductions are claimed on Schedule A (Form 1040) and attached to IRS Form 1040. The rules are set by the Internal Revenue Service.

This guide explains when refinance interest is deductible and what to watch for.

Is Mortgage Interest Still Deductible After Refinancing?

Yes, in most cases, mortgage interest remains deductible after refinancing — as long as the loan meets IRS requirements.

The key rule is this:

Interest is generally deductible only on loans used to buy, build, or substantially improve your primary or secondary home.

If you refinance your original mortgage and the loan balance does not increase beyond qualified limits, the interest typically remains deductible.

Example: You originally borrowed $300,000 to buy your home. You refinance that same balance at a lower rate. The interest on the refinanced loan is generally still deductible.

Loan Limits After Refinancing

Mortgage interest is subject to federal loan limits.

For mortgages taken out after December 15, 2017, interest is generally deductible on up to $750,000 of qualified home loan debt for married couples filing jointly, and $375,000 if married filing separately.

If your refinance does not exceed these limits, your interest is usually deductible.

If your mortgage exceeds the limit, only a portion of the interest may be deductible.

Cash-Out Refinancing

Cash-out refinancing is where rules become more important.

If you refinance and take out additional cash, the deductibility of interest depends on how you use that money.

If the extra funds are used to:

• Improve your home
• Add a room
• Remodel a kitchen
• Replace a roof

The interest on that portion may still be deductible.

If the cash is used for:

• Paying off credit cards
• Buying a car
• Personal expenses

The interest on that portion is generally not deductible.

Example: You refinance your mortgage and take $40,000 in cash to remodel your kitchen. Interest on that $40,000 may be deductible because it improves the home.

Points Paid When Refinancing

If you pay points when refinancing, the deduction rules differ from those of an original purchase mortgage.

For a home purchase, points are often deductible in the year paid.

For a refinance, points are typically deducted over the life of the loan rather than all at once.

Example: If you pay $3,000 in points on a 15-year refinance, you may deduct $200 per year over 15 years, rather than deducting the full $3,000 immediately.

Refinancing a Rental Property

If the property is a rental, mortgage interest is generally deducted as a business expense rather than on Schedule A.

Rental property mortgage interest is not subject to the same itemized deduction limits.

The interest is reported as an expense on your rental income schedule.

Do You Have to Itemize to Deduct Mortgage Interest?

Yes. To deduct mortgage interest on your primary or second home, you must itemize deductions using Schedule A.

If you take the standard deduction, you cannot deduct mortgage interest separately.

Example: If your standard deduction is $14,600 and your total itemized deductions, including mortgage interest, are $12,000, you would take the standard deduction and receive no separate mortgage interest deduction.

Form 1098

Your lender will send you Form 1098 each year showing:

• Mortgage interest paid
• Points paid
• Outstanding loan balance

This information is used to complete Schedule A.

Common Mistakes to Avoid

• Assuming all cash-out refinance interest is deductible
• Forgetting loan balance limits
• Deducting points incorrectly
• Failing to itemize
• Not tracking how cash-out funds were used

Keeping documentation is critical if you refinance and claim deductions.

💻 Electronic Filing Recommendation

E-filing is especially helpful when claiming mortgage interest after refinancing.

Benefits include:

• Automatic enforcement of loan limits
• Proper allocation of deductible interest
• Automatic amortization of refinance points
• Real-time comparison of itemizing vs the standard deduction
• Reduced math errors
• Faster refund processing

Most tax software walks you through refinance questions to ensure only the deductible portion of interest is claimed.

Understanding how refinancing affects the mortgage interest deduction can help you maximize tax savings while staying compliant with IRS rules in 2026.