This document provides instructions for Chartered Accountants on how to file Form 29B for a taxpayer through the new income tax portal. The CA and taxpayer must be registered with valid IDs and the CA's digital signature certificate cannot be expired. Form 29B has three parts and annexures that the CA can access depending on the taxpayer's circumstances. The CA fills out the form, the taxpayer reviews it for acceptance, and then the form is filed through the income tax portal.