Can I deduct full payroll taxes in schedule C?

You should only include the "employer" portion of the taxes.

To find the correct numbers from your Payroll Returns to determine payroll taxes paid, please use these figures: 

• Form 940, Employer's Annual Federal Unemployment (FUTA) Tax Return: Line 12 (Total FUTA tax after adjustments)
• Form 941: Add boxes 5a and 5c, then divide by 2 to calculate employer's match for Social security and Medicare taxes. 
• Your State most likely has an Unemployment Tax as well which requires you to file a return, so be sure to include that figure.
• You do not claim any taxes withheld from your Employee's pay as a payroll expense.  This is because you have already claimed their "gross pay" as a deduction under Wages.

Thank you for the quick response. This is really helpful..

So just to be clear the Gross Wages can include Employee Portion of Taxes (Federal Tax) + Net Pay, right?

Yes.  For example your employee worked 10 hours and is paid $10 per hour.  His gross wages would be $100.  You use $100 as "wages" paid.  So the amount BEFORE any subtractions for fed, state, social security, and medicare taxes.