It depends. If you both made mortgage payments, then you can deduct the actual interest payments you paid (usually in Box 3) versus the amount
the government paid on your behalf. For example, if each person paid 50% of
the mortgage, each person is eligible to deduct 50% of the
interest.
Here's a link to the IRS website with
more information about Form 1098-MA: https://www.irs.gov/forms-pubs/about-form-1098ma
