Is it compulsory to report even losses in tax return

'if there is no taxable income and no tds deducted for individuals tax return filing is not compulsory.'

No........ If income exceed basic limit..........  return filling mandatory

'If there is loss in stock investment in short term , in other words  STCL, is it necessary to report in return or not compulsiory specially if I diont want to carry forward loos and dont want to take benefit against future STCG as I have stopped investing in shares and  MFs.'

All the transactions gets reported to department by AIR.........  In case you have not filed even nil return....... Department sends non-filler of return notice....... and if turnover is high, likely to be selected for scrutiny.....       So based on volume and value of transactions take call.. .....