Mandatory cessation of reassessment proceedings when taxpayer demonstrates assessed amount meets correct liability, limiting assessing officer discretion.
Section 285 fixes tax in section 279 proceedings at rates as if escaped income were included, conditions mandatory cessation of those proceedings on two cumulative showings by the assessee (assessment not lower than correct liability or properly made assessment/computation, and absence of any impugnment under specified challenge provisions), and renders final that cessation by barring reopening of matters concluded by listed orders; procedural modalities and evidentiary standards are not specified.