The 4/2 I am rehabbing now was $55,000 and will take about $12,000 (includes new metal roof and new CHA unit) and comps are $90,000 to $125,000, but I am renting it to a family member for a year or two.  

Cha-ching.

Hey @Maryam Mostafa - That is a pretty open-ended question....there are subsidies in your area that specialize in section 8...for us here in Chicago the main one is CHA Chicago Housing Authority.I'd suggest finding out what is local to your area and link up with them...more than likely they will have a ton of information and education on how the process works.

I work directly with the Chattanooga Housing Authority (CHA).

There is certain strategies such as market vs CHA tenants or larger vs smaller homes that you need to figure out what can work for you.

Purchase price: $39,614 Cash invested: $64,500 Purchased this duplex at auction and it needed some serious work top to bottom including new plumbing, ducts, furnace, partial reroof, garage siding, front and back porch, and bathrooms.Rented it to two CHA tenants $100 for garage, and rents of $1200 and $1138. 3 Bed 2 Bath Unit and 3 Bed 1 Bath Unit.

Chicago Housing Authority (CHA) has always been very reliable in making payments on the first of the month. 

Are you renting CHA/Section 8? 

The issue didn't occur because you were 3 months behind on chaing the filter. the issue happened because she removed the filter before it was needed and put in a crappy substitute !

Cha-ching!