The renovation costs may include a contingency reserve and renovation-related costs.Contingency Reserves:Contingency reserves 10 % required for any unforeseen cost overruns that may occur during construction.Unused contingency reserves that were financed into the loan will be applied to the principal balance of the loan.

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).

However, also don't forget to budget for turnover costs and capex reserves too, which many people ignore. 

Reserves too high? 

Overall documentation has been key and same with having much larger reserves.

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Rent is 2150 against a 1450 mortgage leaving me with 700 monthly revenue.20% of 700 goes to reserves which leaves 560 monthly net. 560 x 12 months = 6720.

Just a heads up.So you calculated out you need  $6 million worth of apartments to hit your goal.A commercial loan may require 20% to 30% down in cash, cash reserves, working capital, and closing costs.You will also need earnest money cash.The lender may also require certain repairs to be done Shortly after the loan is made.The lender may also require the Property to be stabilized as far as occupancy percentage is concerned, leaving little on the bone as far as sweat equity.Good Luck!

but yes a house hack allows you to put down as low as 5% just make sure you have some reserves incase something goes haywire the first year 

I currently utilize this strategy personally.I have a commercial line of credit that I practice pay check parking with.Pay check parking is the practice of parking all free cash flow that you bring in each month after you've set aside your cash reserves (emergency fund).