Section 270AA gives finality where an assessee accepts the...

Section 270AA gives finality where an assessee accepts the assessment without appeal and secures immunity from penalty and prosecution; a later section 154 rectification cannot be used to substantially rewrite the assessment or change its tax consequence, so the rectification order was without jurisdiction. An ad hoc disallowance of expenditure already recorded in the books and reflected in the accounts is not unexplained expenditure under section 69C; it is only an estimated disallowance for want of verification, so section 115BBE could not be applied in rectification proceedings. The Tribunal quashed both the rectification order and the appellate order affirming it.