How does a rental mortgage and rental income affect your debt ratio?
For instance:
Is it 00 rental income – 00 rental mortgage = 0 added to your income only
or
Is 00 of rental income added to your total income and 00 added to your total debt and they are considered separate of each other in the ratio?

Golferwh is correct with one exception. You have to be able to prove that you have been a landlord for 2 years (with tax returns that show rental income) before you can use any of it.