TopSource is a payroll outsourcing company with offices in India and the UK. It has over 180 employees including CAs and IT professionals. TopSource provides end-to-end payroll processing for over 200 clients across various industries. It utilizes a web-based payroll portal called PayOne for employee self-service and leave management. TopSource takes a consultative approach to outsourcing and ensures quality, timely and accurate payroll through its experienced team and in-house infrastructure.