Professional tax urgent

Dear All

My query is as follows:

1. One of the client (company) paid professional tax on director's salary for the period FY 2008-09 to FY 2011-12 during current year.

2. Now how to adjust the amount of PT against salary for the directors?

3. Can I claim professional tax credit in respect of older years?

4. Whilr filing his individual return of income the director can claim aggregate amount of PT or only the amount of PT pertaining to current year?

Regards,

Shraddha