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Hi and welcome to our site!If you pay a mortgage interest to a private person - you would not be sent form 1098. That form is sent by banks and financial companies - but not private persons.Still you may deduct the mortgage interest on schedule A.
Deductions is claimed on line 11 - http://www.irs.gov/pub/irs-pdf/f1040sa.pdfand you would need to provide the name, address and SSN of that seller to whom you may the mortgage.