Forgot to declare loss in last 2 years back ITR

If you forgot to declare a long-term capital gains loss in your Income Tax Return (ITR) for 2018-19, you generally cannot declare it now to carry it forward. Losses must be declared and claimed in the original, timely filed return to be eligible for carry-forward. Similarly, a short-term capital loss already set off in a previous year cannot be declared again. To check if a loss was already set off, review Schedule CFL and BFL in your downloaded ITR forms.