ITC Reversal v/s increased Output liability

There is an option for ITC reversal in Table 4.B of GSTR 3B for ITC reversal under head "Others". 

Although, if the correction was made through addition to outward liability, it is only a disclosure error and has no revenue impact.

Note: GSTR 9 & 9C - disclosures and comments would be required for the same.

The time period to make corrections for FY 2018-19 is passed. Therefore, possibility to obtain correct credit is lapsed. Although, there is still a possibility the department may demand reversal with interest (if utilised) on wrongly taken ITC. In my view, in such a case assessee must be allowed to avail correct credit although there is no supporting in the GST law, and should be litigated in the courts.

Sir Cant we correct it in GSTR 9. Because so much input amount will be lost.

GSTR 9 is cannot be used to claim the credit. self-assessed returns are only allowed and reading of Section 41(2), 49(4), mean that GSTR 3B/3 are the only returns through which ITC can be claimed. 

Alternate view is to consider that there is no revenue impact and credit as such has not been taken in excess but only under the wrong heads. As GST is a new law, we do not know how the Courts would address the issue.