S. 220: Collection and recovery of tax-Stay of demand-Pendency of appeal before CIT(A)-CBDT Office Memorandums do not mandate a rigid pre-deposit of 20%-Assessing Officers must judicially exercise discretion based on prima facie merits, financial hardship, and potential hardship-Matter remanded to the Assessing Officer. [S. 220(6), 250, Art. 226]