How do I enter interest paid from a land contract? We do not have a official form because we bought the house from my parents.

[MichaelL1]

You would enter it in the same section "Your Home" type your parents name in as Lender, and the next screen you will check, "I did not receive a 1099"

To enter mortgage interest

• Click on Federal Taxes (Personal using Home and Business)
• Click on Deductions and Credits 
• Click on I'll choose what I work on (if shown)
• Under Your Home
• On Mortgage Interest, click on the start or update button

Really not much different than getting a 1098.  Make sure what you list as interest expense agrees with parents, as this is the same amount they should be reporting as income.