Payroll software firm Paychex Inc. agreed to buy privately held SurePayroll Inc. for an undisclosed sum.

Rochester, N.Y.-based Paychex provides a full menu of services for small to medium-size businesses such as payroll, human resources and employee benefits outsourcing. Meanwhile, SurePayroll, which has about 30,000 small business customers, provides online payroll services through banking partners including  Citibank, Harris Bank and SunTrust Bank. Get the full story »