Section 29(4) in The Punjab Value Added Tax Act, 2005
(4)An assessment under sub-section (2) or sub-section (3), may be made within three years after the date when the annual statement was filed or due to be filed, whichever is later:Provided that where circumstances so warrant, the Commissioner may, by an order in writing, allow assessment of a taxable person or of a registered person after three years, but not later than six years from the date, when annual statement was filed or due to be filed by such person, whichever is later.