Tax charge rate applied as if income had not escaped, with procedure allowing dropping proceedings on an assessee claim. Clause 285 provides that tax in any assessment, reassessment or recomputation under the escape provisions shall be charged at the rate(s) applicable as if the income had not escaped assessment. The Assessing Officer may drop proceedings if the assessee asserts the original assessment is not lower than the correct liability and has not impugned the original assessment order; such a claim prevents reopening matters already concluded by earlier assessment or computation orders.