Retirement tax questions

NO ... you are NOT an employee on your own Sch C so it is not treated as a deductible employee contribution...  from the Sch C instructions : 

 

Line 19
Enter your deduction for the contributions you made for the benefit of your employees to a pension, profit-sharing, or annuity plan (including SEP, SIMPLE, and SARSEP plans described inPub. 560). If the plan included you as a  self-employed person, enter the contributions made as an employer on your behalf on Schedule 1 (Form 1040), line 16, not on Schedule C.