Fiscal Year for Tax Book

Hello

Our Corp Book has Fiscal year from APR to MAR and periods like JAN16-16, FEB16-16,MAR16-16, APR16-17, MAY16-17.

Tax Requirement is to have a fiscal year which is a calendar year. So for Tax Book; the Fiscal year desired is JAN to DEC.

I was looking at the FA Training and it mentions that the calendar for a tax book must use the same fiscal year name as the calendar for the associated corporate book.

But in our case we can't do this as the TAX dept would like their fiscal year from JAN to DEC.