While OnPay and Paychex are popular payroll services that offer automatic tax filing, benefits and HR tools, OnPay sells only a single payroll plan for one to 1,000 employees, whereas Paychex has ...

Paychex is our pick for best overall due to its three plan levels – Select, Pro and Enterprise – each of which comes with payroll processing, payroll tax administration for W-2 and 1099 ...