Get all rents for 2021 and subtract the expenses which are Principal, Taxes, Insurance  and rehab work.2.

Everything I've read or watched about yet subject states buying at 70% below ARV then subtracting rehab cost equals your purchase price.

If you sell, take the profit and use a a 20% down payment on a true rental property with high positive CF, you'll be light years ahead in profit by the time you break even holding this property and doing the rehab.Do the first step of the math:1 -  Figure out what profit you'll make selling the property.2 - Then calculate all the rehab needed, all the monthly expenses you'll need to cover holding it with a tenant in place (add in the monthly expenses when the tenant isn't there...as in rehab time), and subtract that from the potential (realistic...not high end wish).  3 - Multiply that number times 12 to get the yearly cash flow "potential".4 - Now divide the number from Step #1 by the number from Step #3.That's how long it will take you to wait for the cash flow to equal the dollars in hand right now.5 - Take the number from Step #1 and multiply it times 5 to get the total property value you can buy using the Step #1 cash as a 20% DP.6 - Compare number from Step #5 with Step #1 to see what you're losing in Property Value if you hold the property.7 - Find out what the potential CF could be on the properties you bought from Step #5, and subtract that with the number from Step #'s 2 and 3. 

Add all these expenses up and subtract them from your total rent amount to get the monthly cash flow.Different people have different numbers they want to achieve for cashflow.

You subtract the mortgage payment from the rental income and come up with a net figure instead.So, if you have a mortgage payment of 2000 and rental income of 3000 then you're net rental income is 1000.

You then subtract your $350k mortgage and refinancing costs.  

Your CF will be $13k/year, but subtracting at least 2 months for rehab and 1 month to fill the units, that leaves you with only 9 months of income = $9810. 

It's people who add value or subtract value in the real estate game—whether by design or by accident.Already, opening this book has improved my perspective and helped me grow.Hope you enjoy it!

.-75% of the rent amount less your PITIA and MI is added or subtracted to your DTI.

Find something close in sqftage and house specs and add/subtract for that.