If you did not receive a Form 1098 from the bank or mortgage company you paid interest to, contact them to get a Form 1098 issued.
Mortgage Interest Not Reported on Form 1098
If you purchased the home from an individual and paid the interest directly to them, use this section to report the amount you paid and record the individual's information. You are required to report that recipient's name, Social Security Number, and address when deducting this mortgage interest on your return.