Power to withhold tax refunds when proceedings threaten revenue, subject to senior approval and duration limits. Section 241 previously empowered the assessing authority to withhold a tax refund where, in the officer's opinion, the refund's grant was likely to adversely affect revenue because an order was under appeal, further proceedings or other proceedings were pending, or an assessment notice was likely; exercise of the power required prior approval of the Commissioner or Chief Commissioner and could be withheld for the period determined by that approving authority. The provision has since been omitted from the statute.