For 2026 tax purposes, homeowners can generally deduct mortgage interest on up to $750,000 of qualified home acquisition debt ($375,000 if married filing separately) for loans taken out after December 15, 2017. Loans from before that date may qualify under the prior $1 million limit ($500,000 if married filing separately). This deduction applies only if you itemize on Schedule A of Form 1040, and the mortgage must be secured by your main home or second home.

Key Limits

The IRS sets clear boundaries on deductible amounts based on when the debt was incurred and its purpose:

  • Post-2017 loans : Interest is deductible on the first $750,000 of debt used to buy, build, or substantially improve your home. Home equity loans no longer qualify unless proceeds were used for those purposes.
  • Pre-Dec 16, 2017 loans : Higher $1 million cap applies, grandfathered in indefinitely.
  • Exceeding these limits means only a pro-rated portion of interest is deductible.

Who Qualifies

Eligibility hinges on itemizing deductions rather than taking the standard deduction, which for 2025 was $15,000 single/$30,000 married filing jointly (2026 figures pending inflation adjustment).

  • Must be "qualified residence interest" on a mortgage secured by your primary or second home (e.g., house, condo, mobile home, boat with living facilities).
  • Points paid on purchase mortgages are often fully deductible upfront if for your main home.
  • Renters converting to owners or refinancers should check Form 1098 from their lender for exact interest paid.

Real-World Example

Consider a $400,000 mortgage at 6.5% interest in the 24% tax bracket: Annual interest ≈$26,000. Deducting it reduces taxable income by $26,000, saving ~$6,240 in taxes—making homeownership cheaper post-tax. Yet, if total itemized deductions fall below the standard deduction, this benefit vanishes.

Recent Forum Buzz

On Reddit's r/personalfinance, users debate its value: "Is it really a write- off if you're in a low bracket?" One mid-level software engineer questioned deducting amid high state taxes, sparking replies like "Run the numbers—standard deduction often wins now." Trending discussions highlight how TCJA changes (expiring post-2025) might revert limits to $1 million, boosting deductions amid 2026 refi talks.

TL;DR

Deduct interest on up to $750K new debt/$1M old debt if itemizing; compare to standard deduction first. Rules stable for 2026 per IRS Pub 936, but consult a tax pro for your situation.

Information gathered from public forums or data available on the internet and portrayed here.