E-verification is required for online returns. E-verification can be carried out using an Aadhaar OTP, net banking, or a bank or Demat account. If you are unable to e-verify your return, you may download the return filing acknowledgment (ITR V), print it, sign it, and send it to CPC, Bangalore for processing your returns. Furthermore, if you are filing a paper return (and are not required to do so online), you may sign your return of income to authenticate it and submit it to the jurisdictional income tax office.