Reporting 1099-S

[A_1812]

I am reporting the total proceeds from 1099-S received from sales of property on Schedule C Part I-Line 1

I am reporting income on Schedule C since the proceeds were from real-estate flipping activity- I am classifying my activity as a "dealer" not investor.

Do I need to attach statement to tax return explaining why 1099-S total is on Schedule C  and not on  Schedule D to IRS? 

[Critter-3]

What return are you filling in ?   A 1040 with a Sch C ?   Or an 1120-S ? 

[A_1812]

I'm filing 1040 with Schedule C