Joint Mortgage Interest

The buy-to-let property is under the wife's sole name. However, the loan on the property is under both husband's and wife's names. Can the wife claim 100% of the loan interest or only her portion of 50%? Thank you.

Hi
Thank you for your question.  
To answer your question, emphasis needs to be placed on what the purpose of the loan is for.
If it has been used wholly and exclusively for the rental business, then the loan interest and any arrangement fees are allowed as finance costs, with relief given at the basic rate and the wife may claim a deduction for her share of the loan interest.
Further information can found at:
Introduction: jointly owned property & partnerships 
Regards.