Mismatch in Details

• TAN may be rejected during e-filing if there is a mismatch between the TAN and the entity’s PAN or name details.
  
• Discrepancies in registered information such as spelling errors, incorrect jurisdiction, or outdated data can lead to validation failure.
  

Unregistered TAN in Portal

• If the TAN has not been properly registered on the income tax e-filing portal, it will not be accepted for return submission.
  
• The system may block access to filing forms or reflect errors stating that TAN is invalid or not available.
  

Technical or Profile Issues

• System errors or incomplete organization profile setups can prevent TAN recognition.
  
• Missing details like contact information, email authentication, or digital signature configuration may interrupt validation.
  

Expired or Cancelled TAN

• A TAN that has been cancelled or deactivated for any reason will not be accepted during return filing.
  
• This may happen due to multiple TANs being issued for the same entity or inactivity over several years.
  

Incorrect Form or Usage

• Using the wrong form type or trying to file returns unrelated to the TAN’s purpose (e.g., using TAN for PAN-based returns) results in rejection.
  
• The system checks the form compatibility with the TAN’s classification and purpose.