The taxpayer is given the option to e-Verify his ITR before or after logging in to the e-Filing portal. However, the only difference is that while using the pre-login service, the taxpayer is required to provide the details of his filed ITR such as PAN, Assessment Year, and Acknowledgment Number before e-Verifying the ITR. If the post-login service is opted for, he will select the record of the ITR filed instead of providing such details manually.