You have to do practically nothing additional when you move from the end of one Financial Year to the start of a new one. As soon as you close the Payroll for March, all updates are automatically done for you, instantly enabling you to work with the new financial year. These updates include:
1. Reset of Investment details of employees to Zero.
2. Updating financial year start and end dates
3. Updating previous employer income and tax to Zero.
4. Carry forward of Salary / CTC rates to new year.
Once you close the March period, do check if all these updates are shown correctly under various screens.