Welcome to the site. Different Expert here. Since your first Expert opted out, I can assist.
The payroll service appears to have given you a figure for the amount of cash needed for the payroll taxes
, which should be around 12-18% of the total. In my state, payroll taxes will be 7.65% for Social Security and Medicare, another 5% for Federal and state unemployment, and any other items your payroll company charges as payroll taxes. 625/3328 = ~18.8%, so it's not way out of line.
I do not know of any 60-40 split for employee taxes. Payroll taxes are 50-50 for Social Security and Medicare, and you as employer are responsible for the Fed and state unemployment.
Sometimes the payroll service offers health insurance or other fringe benefits, which you might have agreed to pay 60% and the employees 40%. I would not consider that a payroll tax, though.
I hope that helps. Please advise if you need anything more, or leave positive feedback to close out the question. I'm PDtax.