But just take you're Cash Flow (which you get from taking your net operating income and subtracting your debt service) and then divide that by your overall cash investment.

Subtract some chunk off that for the price it will get at a foreclosure auction (months from now) and then subtract off another $20K for legal fees. 

Take the monthly taxes and insurance subtract them from the 95 percent of the $1,200.00 and what is left is available to service the debt.

Then you would subtract business expenses you incurred, such as property tax, Mgmt fees, HOA, insurance, mortgage interest and possibly others.

It's calculated by subtracting expenses from rental income.Return on Investment (ROI): ROI tells you how much money you're making compared to how much you invested.

I put my estimate together and subtracted it from my original offer (about $15,000).

Subtract that debt service and it's $8,700 in cash flow. 

They subtract out all their expenses and what's left is the net income.

Just run the numbers on areas and types of properties you'd be interested in.Look at comparable properties on vrbo and airbnb to see how full they are and how much they charge.Then subtract out operating expenses and lost use from your family using the priperty x amount of day.

Technically, I can subtract handling fees in one of these jurisdictions.