1) Make sure the provider offers the specific services you need, such as handling taxes and compliance with labor laws. 2) Look for a provider with a good reputation and positive customer reviews. 3) Consider the cost of the service and whether it fits within your budget. 4) Check if the provider offers online access to payroll information and employee self-service portals. 5) Look for a provider who can integrate with your current accounting software. 6) Evaluate the level of customer support offered by the provider.