Form 1098 is the statement your lender sends you to let you know how much mortgage interest, points, or private mortgage insurance you paid during the year.
Sometimes, these forms don't look like tax forms, but they should say Form 1098 somewhere on them. If you didn't receive a Form 1098 from your lender, the information might be reported on your January statement or bill from your lender.
If you paid more interest than your Form 1098 shows, you must attach a statement to your tax return that explains why you can deduct more than your lender reported on your Form 1098.
However, if you received a refund of interest, you must report the refund as well.