TDS applicability and TAN application

Mohan (Audit Assisstant & Accounts Manager)   (489 Points)

10 November 2018  
Assessee's books audited for the first time and return filed in October 2018. Assessee becomes liable for TDS and is going to apply for TAN. The query is whether tax required to be deducted on expenses for the period pre-TAN application as well and file returs for the same? If yes, then whether various interest attracts along with late filing fee u/s.234E?