Rectification of mistake allows amendment of intimations to correct apparent errors, with notice and hearing before increasing liability. Rectification of mistake permits the Assessing Officer to amend an intimation under the equalisation levy to correct apparent errors within one year of the financial year end; amendments may be suo motu or on notice by the assessee or e commerce operator. If the amendment increases liability or reduces a refund, the Assessing Officer must give notice and a reasonable opportunity of being heard and shall issue an order specifying the sum payable when the amendment enhances the payable amount or reduces a refund.