Treasury (or the Secretary’s delegate) may extend the applicable period for a period not to exceed 3 additional calendar months if the Secretary (or the Secretary’s delegate) determines that the emergency related to COVID-19 is likely to be ongoing during such period. If such period is so extended, the dollar amount in subsection (b) shall be increased by $12,500 for each month of such extension (and a like rate of increase with respect to any extension which is not a whole number of months).