Please ignore my earlier calculator since effective date of change in rate of service tax is from 01/06/2015. In the last file I have taken that effective rate of change wrongly as 15/05/2015.
You can enter values only in white colored cells. You will get final amount of service tax payable in each month in the last sheet. Please give me your feed back also in case you find any bug. My mail id: firstname.lastname@example.org