You make the callBy: National Association of Tax Professionals
May 8, 2025

Question: Alex purchased his home in 2024, and his average mortgage balance for the year was $900,000. He paid $32,000 in mortgage interest during the year. He is single and wants to know how much of his mortgage interest is deductible on Schedule A (Form 1040), Itemized Deductions.

Answer: Under §163(h)(3)(F)(i)(II), for mortgages taken out after December 15, 2017, the deduction for mortgage interest is limited to the interest paid up to $750,000 of home acquisition debt for single filers. Interest attributable to mortgage debt above this limit is not deductible.

Alex’s average mortgage balance of $900,000 exceeds the allowable limit by $150,000 ($900,000 –- 750,000). To calculate the deductible portion of his interest, apply the following ratio:

$750,000 / $900,000 = 0.833 (or 83.3%)

0.833 × $32,000 = $26,656

Alex may deduct $26,656 of the mortgage interest he paid in 2024 on Schedule A (Form 1040), Itemized Deductions. The remaining $5,344 of interest is not deductible.

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penAbout National Association of Tax Professionals

The National Association of Tax Professionals (NATP) is the largest association dedicated to equipping tax professionals with the resources, connections and education they need to provide the highest level of service to their clients. NATP is comprised of over 23,000 leading tax professionals who believe in a superior standard of ethics and exemplify professional excellence. Members rely on NATP to deliver professional connections, content expertise and advocacy that provides them with the support they need to best serve their clients. The organization welcomes all tax professionals in their quest to continually meet the needs of the public, no matter where they are in their careers.

The NATP headquarters is located in Appleton, WI. To learn more, visit www.natptax.com.

Information included in this article is accurate as of the publish date. This post is not reflective of tax law changes or IRS guidance that may have occurred after the date of publishing.

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