Corporate payroll tax deductions - single person S corp

[Josh Ferona]

Hello, 
I have a payroll company but I am having a hard time finding the form that tells me how much $$ I can write off in corporate payroll deductions. Is there an easy way to figure this out, such as a form to look at? 

And I am correct that I can write off employer payroll taxes right? 

Thank you for your help