Obtain forms from either the County Assessor or the Clerk of the Board in the county where the property is located). By signing the filled-out form, you: 1.If you are self-employed: Fill in this section and attach a profit and loss statement for the past 2 years or a Schedule C from your last federal tax return. A joint owner who pays more than his pro rata share of mortgage interest and taxes ought to be able to claim a deduction for the full amount paid. Most likely because your mortgage lender pays your property taxes for you. Form 1098 requires lenders to provide information on the property securing the mortgage loan. All rights reserved. Warning about adding names. If you are adding someone as part of a credit repair or loan deal, it may be a scam. In the real estate category, it's asking for a copy of the deed and mortgage statement.