The tax imposed by this chapter, and interest and penalties, is a personal debt of the taxpayer from the time the liability arises, regardless of when the time for discharging the liability by payment occurs. The debt is, in the case of any fiduciary, that of the individual in the individual’s official or fiduciary capacity only, unless the individual has voluntarily distributed the assets held in that capacity without reserving sufficient assets to pay the tax, interest, and penalties, in which event the individual is personally liable for the deficiency.