About $900 a month after taxes/insurance/and misc repairs. 

After subtracting all that from the 3333.00 , whats left is what you can spend on a mortgage payment including property tax, home insurance and mortgage insurance.

is it illegal to sell my Tax Deed by quit quitclaim Deed?

And since the qualified mortgage law in 2010, these loans have remained solid, and thus, so has the mortgage securities market.

I think most of his flips are in inexpensive cities like Cleveland, Detroit area, etc. https://flipsystem.com/faq/I think $10,000 to $20,000 (before IRS taxes) is a really small profit margin.

He is ONLY willing to sell by owner financing.I am not a tax expert in estate taxes, but my guess from knowing others who have had similar situations is that IF he sold it outright for say 300K, he might have 75K of taxes.

Often, they don't, and are in violation of license law.  

Bare minimum for me is $20,000 after a flip (before IRS taxes). 

I am wondering what are the tax implications for this individuals (most of them are from Spain). 

For more precise estimates of rental revenue, think about speaking with nearby property managers or real estate brokers that focus on rental properties.Closing costs: Compute the closing expenses for the duplex purchase, taking into account attorney fees, title insurance, property taxes, appraisal fees, and loan origination fees.