I've included an example below to help illustrate this.So different lenders have different rates (which do vary even for DSCR loans) but these are factors they all consider.See example below:DSCR < 1Principal + Interest = $1,700Taxes = $350, Insurance = $100, Association Dues = $50Total PITIA = $2200Rent = $2000DSCR = Rent/PITIA = 2000/2200 = 0.91Since the DSCR is 0.91, we know the expenses are greater than the income of the property.DSCR >1Principal + Interest = $1,500Taxes = $250, Insurance = $100, Association Dues = $25Total PITIA = $1875 Rent = $2300DSCR = Rent/PITIA = 2300/1875 = 1.23If a purchase, you also generally need reserves / savings to show you have 3-6 month payments of PITIA (principal / interest (mortgage payment), property taxes and insurance and HOA (if applicable).

If you want to think about it as a math problem, it’s all about where you put your time to maximize returns while also factoring in what you enjoy doing.Picking the MarketI’m the kind of person who gets analysis paralysis.

Of course you have to factor in realtor and closing costs on top.

ARV is a very important factor here. 600 FICO is minimum. 

@Stephen Fleming your cashflow probably won't be what you think it will be:(Have you factored in the new property taxes at homestead millage rates?

One of the biggest factors in successful flips is building a strong team: contractors, agents, lenders, and property managers. 

@Robert Quiroz I think all of the factors you have listed might contribute.So I’m not going to comment on that but I am going to comment on an assumption you made.If 85% of rents are below market on deals you underwrite then those contract rents are probably THE market rent.You can’t just go based upon area median income to rent ratio.First off urban areas are oftentimes street by street, block by block.

The precise property forecast can vary depending on a lot of factors but the general demand is really what you should use the tool for to make your plans. 

Regionality and competition greatly factors into the cost structure.

Vacancy and maintenance factors should be higher than for Class A or B.