If you made an entry that indicated to TurboTax that you either issued a 1099 to the renter or they issued you a 1099 for the rent paid, then the program may ask you for their SSN. Check over your answers to the interview questions about the rental, and remove any answers that indicated you issued or received a 1099 from the renter.
You could need to issue a 1099 if you paid someone as an independent contractor to do work on the rental that totaled $600 or more.
See this tax tips article for more information about Forms 1099.
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