Filing your returns online is not the end of your task. You need to take a print of the acknowledgement and sign and mail it to the CPC in Bengaluru. An easier way to send the acknowledgement is to do it online using your digital signature. The IT department also permits you to acknowledge your returns using your Net Banking login. This not only simplifies the task but also makes credit of refunds faster. Apart from sending it physically, now if your Aadhar is mapped to your PAN card then you can acknowledge your returns using your Aadhar card authentication itself. It is quicker and a lot simpler.