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New TAN Number can be applied online on NSDL using TAN Application online.
Tan Registration Number is required for TDS Return.
TAN certificate can be applied new or reprint using Change or correction Option on NSDL
TAN can be applied using Digital Siganture Certificate DSC.
TAN Correction can be filed online on NSDL and download duplicate TAN Certificate.
The Lost TAN can be find on Income Tax Website.