As you are aware , the last date for filing the TNVAT Audit Report in Form WW is 31st December every year.
For the year 2015-16, the last date for filing the same is 31st December 2016.
Recently, the TNVAT department has introduced a new Form WW for filing the VAT Audit Report. There was a confusion about the applicability of this new form.
The TNVAT Department has clarified that the new format is not applicable for the year 2015-16 & it is applicable for the year 2016-17 only.
In view of the above, for the year 2015-16, TNVAT dealers who are liable to submit the VAT Audit Report may submit the reports in the old format only.
Source :- https://ctd.tn.gov.in