Assessment of non filers: orders withdrawable if valid return filed within prescribed period; interest and late fees continue. Section 62 enables assessing officers to issue best judgement assessment orders for registered persons who fail to file returns under section 39, section 45 or after section 46 notice; such orders must be issued within five years from the annual return due date and be summarized in FORM GST DRC-07. If a valid return is furnished within the prescribed period after service of the assessment order, the order is deemed withdrawn though interest and late fee liabilities continue; an extended filing period with additional daily late fee is available and specified amnesty relief deems certain earlier orders withdrawn on compliance.