EIN Number for rental property

[Nahal Beckam]

Hello, we have a rental (me and my husband) that we manage ourselves. In order to open a business account I applied  for an EIN number under the category of partnership. I wonder if we need to file some additional tax return forms now that we have EIN?  I heard that if we do not fill the tax return forms properly we will be fined about $600 each. any response is appreciated.

thansk