How much hike should I expect while going on a direct payroll from a third party payroll? If the client wants me on direct payroll that means I have proven myself and I deserve a hike, isn't it?

The amount of the hike can depend on various factors, such as your current salary, market rates for your role, and the client's budget.

Moving from a third-party payroll to direct payroll can indeed be an opportunity to negotiate a salary increase, especially if the client values your work and wants to retain you. The amount of the hike can depend on various factors, such as your current salary, market rates for your role, and the client's budget. It's important to research typical salaries for your position and consider your own performance and contributions when discussing a raise. It may also be helpful to seek advice from a professional or a mentor in your industry to better understand what would be appropriate in your specific situation.