I have an S Corporation with gross payroll of 50K for me as, an only shareholder and employee I have deducted 18,500 salary deferral for 401(k) solo. The employee contribution to 401k would be 12,500 at 25%. My question is, in additions to this can I contribute $12,500 (25% of wages  to SEP in the same year and deduct on my 1120S?