How soon can you add renter's income to personal income?

[Manuel Savorelli]

I was curious as to whether there is a wait time needed before a landlord could add the monthly rental income he receives from his multi family property onto his own personal income? 

I'm looking to purchase a small apt with hard money and I'm thinking of how to refinance the loan through conventional banks for a lower rate with little income on tax forms.  

Would I be able to show the property cash flows and would banks be satisfied? 

What if I opened an LLC? How would the fact that it's brand new, w/o any income history affect it's bank loan approval chance?

Thanks everyone