While it is essential to be careful while filing tax returns, it is not uncommon for people to make mistakes. Returns filed with errors are considered ‘defective returns’ by the tax department. Under Section 139(9) of the IT Act, the tax department issues the ‘Defective Return Notice’ for rectifying the mistake.  Here are some of the most important things you should know about this notice.  When is the Defective Return Notice Issued? There can be several reasons why the tax department might issue the defective return notice. Here are some of the most common reasons.  Incomplete tax returns or detail...