@James Moore hmm, I might need to clarify some things here.
If you are asking will a lender to a 100% LOAN TO VALUE (LTV) loan using nothing but the rental income - then absolutely not. No such product exists. It's hard to even have a 100% LTV primary home loan. You cannot get it on an investment property at all. 25% down is the norm. There are some 20% down options but there are some catches to those loans.
Now, if you asked will a lender finance 100% of my entire loan based on the rental income - YES! That is completely possible and what we want to use when focusing on that type of loan.
Why is this difference important?
Let's say you find an investment property with an After Repair Value of $200,000.
You can by this home for $100,000 and it needs $50,000 of rehab.
This would be a perfect scenario for a Hard Money Loan (HML) because most HML's will lend us 75% of the ARV.
Once the rehab is complete, we then refinance 100% of that $150k loan from the HML with a loan that just uses the rental income to help me qualify.
Did we come out of pocket? yes, because there are closing costs but we got 100% of the loan covered.
Anyway, sometimes these little nuances can make a difference. Hope all of this makes sense but feel free to post anything else if you need. Thanks!