Talk to me about "numbers don't add up."
$40k house that nets you 20k in immediate equity.
At $900 / month, you're at $10,800 / year. Let's be pretty aggressive with our underwriting costs and assume:
$200 / month taxes
$45 / month vacancy (@ 5%)
$150 / month CAPEX & Maintenance - its a fresh rehab (unless you're spending $20k on lipstick)
$75 / month insurance
$135 / month PM (@15%, which is high.)
So expenses are $605 / month. At the $800 - $1,000 price point you'll likely have a section 8 tenant and, given the price point of comps, this isn't the best of neighborhoods so you're not going to get much appreciation.
You will, however, have $295 / month in cash flow or $3540 / year. That's 9% CoC which, to be fair, isn't the worst thing in the world.
With some ballpark numbers (made up here) for an alternative exit strategy:
Rent it out for 2-3 years, then set it up with a rent-to-own program: 8 year lease at $1,100 / month. You'll pay insurance and taxes and keep title in your name; tenant is responsible for maintenance and upkeep beyond that. At the end of year 8, the tenant may purchase the home for $1; there is no equity transfer and the title and contract will sit in a land trust. When you sell, you just sold for a "loss" so there's no depreciation recapture. In 10 years you've doubled your money. I'm admittedly not being very nuanced with the numbers here, just throwing you a different idea - all while being pretty conservative with numbers and assuming no appreciation or real rent increases.