SCE1
Level 2

Why is it not necessary to aggregate rental properties when income is less than $329,400?

I am still trying to understand rental property aggregation for the purpose of QBI income, Form 8995.  I am NOT a Real Estate Professional.  Can someone explain why Turbo Tax says, "It is not necessary to aggregate rental properties" (for the purpose of the QBI income deduction), when your married filing jointly income is less than $329,800?  Why is it not necessary?  

Thank you.