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.
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.