Track Tax Functionality in P0901

Hello,

Greetings!

We have a situation, where we want to capture details of Expenses based on the Tax Rate. E.g. When we booked Voucher for Advertisement we use tax rate area 12PUR, we need to identify against Advertisement which Tax Rate Area was booked.

When I was looking for solution, I gone through P0901 (Revise Chart of Account). There is one filed Taxable, and this field is getting populated when we enter expenses (if we have defined tax rate are)

My question over here is, why we have this field in Chart of Account (functionality) ? Or is there any accounting / reporting implication if we use Taxable filed in chart of accounts for the expense and develop customized object for further reporting purpose?