No. The mortgage‑interest limit is not per person. It applies per residence, regardless of how many owners there are or whether they are married. That means two unmarried people do NOT each get a separate $750,000 limit. They must share one combined limit for the same property.
Even though the limit is shared, each co‑owner can deduct only the interest they actually paid, and only up to their share of the allowable mortgage limit. For example:
- Two unmarried people jointly own a home with a $900,000 mortgage.
- The allowable limit is $750,000 total, not $750,000 × 2.
- Each owner applies the limit proportionally to their share of the debt and the interest they paid.
Here is the key language from Publication 936 (2025) in the reminder section in the opening paragraph of the publication.
“You can deduct home mortgage interest on the first $750,000 ($375,000 if married filing separately) of indebtedness.”
There is no section in Publication 936 that says unmarried co‑owners each get their own $750,000 limit. There is no section that says the limit is per taxpayer. There is no section that allows doubling the limit for two unmarried owners.
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