Rantalainen is Finland's largest accounting and payroll service provider, catering to over 25,000 customer companies in the SME sector, with a strong presence in Sweden as well. The company offers three primary services: financial administration (including outsourced accounting, business intelligence, and third-party accounting software sales), payroll administration and HR services (outsourced payroll, expense claims, and workforce management, along with third-party payroll software sales), and additional value-added expert services (such as tax and legal advisory, interim CFO/controller services, and business process automation consulting).