Do I have to file a Schedule C of 1040 or Schedule D of 1040? 

You reference after the post "or just similar return as saving in banks" and that confuses me because I don't think anyone would consider that big money.Also, you say big money not big return % which is probably just a typo, but you can make $1 mil a year if you made 1% by investing $100 mil as an example.The answer I think you're looking for is what are returns as compared to a savings account and thats very easy to answer, they are vastly different, but passive investing will also give you vastly different returns depending on the asset you invest in.Most people that are quoting 15-20% returns are talking about annualized returns or IRRs which is not payouts per year like dividends or cash flow, deals like that tend to pay dividends quarterly of around 6-8% and the rest of the 15-20% per year is accrued until sale.However, most of those assets would also C/B assets (B is even debatable) and are often using moderate/high leverage in debt from a bank which makes it significantly more risky than putting your money in a savings account.

This is a 506 C offering

In addition to finishing the floors, walls, ceiling, it also should include ducting in the heat and A/C.

@Jennifer Ryan that's interesting b/c we are actively closing deals.

C-19 is a black swan if there ever was one. 

New A/C and updated sprinkler system & panel.More pictures at: https://www.zillow.com/homes/4305-S-Perry-St-Spokane,-WA,-99203_rb/23538351_zpid/?

Gas heat and water and central A/C. 24 x 24 detached shop in the back.

My wife and I are in the middle of selling our home and a flip we did and moving to another state. We are fairly new to re investing. We currently have a duplex and the two homes previously mentioned. In our move we ...

c) Stick to Realtor-LO teams.