You can only claim mortgage interest on your primary home and ONE second home. Take note of the IRS Pub. 936 excerpt below in bold-face type.
Please read this IRS document for more information:
https://www.irs.gov/publications/p936
More than one second home.
"If you have more than one second home, you can treat only one as the qualified second home during any year. However, you can change the home you treat as a second home during the year in the following situations.
If you get a new home during the year, you can choose to treat the new home as your second home as of the day you buy it.
If your main home no longer qualifies as your main home, you can choose to treat it as your second home as of the day you stop using it as your main home.
If your second home is sold during the year or becomes your main home, you can choose a new second home as of the day you sell the old one or begin using it as your main home."
