Self-assessment means an assessment by the registered person himself and not an assessment conducted or carried out by the Proper Officer. The GST regime continues to promote the scheme of self-assessment. Hence, every registered person would be required to assess his tax dues in accordance with the provisions of GST Act and report the basis of calculation of tax dues to the tax administrators, by filing periodic tax returns.
The provisions of the law permit a registered person to rectify any incorrect particulars furnished in the returns. In terms of Section 39(9), if a registered person discovers any omission or incorrect particulars furnished in a return, he is required to rectify such omission or incorrect particulars in the return to be furnished for the tax period during which such omission or incorrect particulars are noticed (on payment of due interest), unless the same is as a result of scrutiny, audit, inspection or enforcement activity by the tax authorities, or such rectification is time barred(i.e., after the due date for furnishing of return for the month of September or second quarter following the end of the financial year, or the actual date of furnishing of relevant annual return, whichever is earlier).
Further, Para 4 of Circular 26/2017 dated 29.12.17, clarifies that in case of summary returns like GSTR-3B, where there are no separate tables for reflecting tax effects of amendments for past periods are available, the figures pertaining to the current month can be adjusted for past month amendments, so long as the amount is not negative. These provisions exhort the concept of selfassessment.