There are many variables but here is one sample.You make your money when you buy.

There are so many variables, location, lender, condition, non-paying tenants and so on.  

Even when you do you’re own due diligence the variables are great.  

It’s honestly a very embarrassing situation to look at, but my current plan is to reduce variable expenses and look at breaking our leases and moving to more affordable housing in the summer.

Pretty hard to calculate as there are too many variables.

RE is just so much more variable than stocks and bonds, though. 

The issue will be if the income is not sufficient enough to repay the loan, or is considered variable and not consistent. 

There are a lot of variables and sometimes lenders do what would seem to be very peculiar things because they have internal issues or policies they will never tell you about.

It's not going to be like 2008.  2008 was mainly due to the sub-prime mortgages and variable interest loans that people couldn't afford once the rates adjusted

If the rent does cover the cost of the loan and the other variable costs of operating your rental this might be the win win for your current situation.